USMLE_Gastro A (1-100)

1- An 82-year-old woman presents 1-hour after the sudden onset of moderate-to-severe epigastric pain. The pain radiates to her back, both scapulae, and both arms. She has been nauseated and vomited three times in the past hour. Her past medical history is remarkable for peptic ulcer disease 10-years ago, cholelithiasis for the past 6-years, and stable angina pectoris for the past 3-years. She has had occasional episodes of biliary colic and two bouts of acute cholecystitis which were treated conservatively. Her temperature is 36.8C (98.2F), blood pressure is 120/70 mm Hg, pulse is 90/min, and respirations are 14/min. The lungs are clear to auscultation. Abdominal examination shows a soft abdomen with mild tenderness to palpation in the epigastrium. Murphy's sign is negative. Which of the following studies should be done first?

3- A 45-year-old nurse practitioner presents to the emergency department due to painful abdominal cramps and watery diarrhea. She has about 10 to 20 bowel movements a day. She also has nocturnal bowel movements. She has had multiple hospitalizations in the past for similar problems without a definite diagnosis. A lower GI endoscopy during a previous hospitalization showed dark brown discoloration of the colon with lymph follicles shining through as pale patches. Which of the following is the most likely diagnosis?

4. A 65-year-old woman presents with a 2-month history of fatigue and dyspnea on exertion. She takes no medication. Her temperature is 36.7C (98F), blood pressure is 162/83 mm Hg, pulse is 100/min, and respirations are 21/min. Auscultation shows a 2/6 systolic murmur in the 2nd right intercostal space. No peripheral edema is noted. Rectal examination shows no abnormalities. Test of the stool for occult blood is negative. EKG shows sinus tachycardia and non-specific ST-T changes. Laboratory studies show: Hemoglobin 8.1 g/L MCV 73 fl Platelets 360,000/mm3 Leukocyte count 4,500/mm3 Neutrophils 56% Eosinophils 1% Lymphocytes 33% Monocytes 10% Which of the following is the most appropriate next step in management?

6. A 45-year-old Mexican male presents with a 2-day history of traces of blood on the tissue paper after he wipes. He does not have gross blood mixed with stool, but on one occasion there were drops of blood in the toilet after defecation. He has no past medical history or family history of cancer or other significant disease. Which of the following is the most appropriate next step in management?

7. A 65-year-old man comes to the physician's office with a 2-month history of dysphagia. He initially had difficulty swallowing solids, but now this includes liquids. He has occasional heartburn, which usually responds well to antacids. He has lost 20 lbs of weight in the past 2 months. He has a 40 pack-year history of smoking. He has been a chronic alcoholic for 20 years. His temperature is 36.7C(98F), blood pressure is 110/80 mm Hg, pulse is 66/min, and respirations are 14/min. Physical examination shows no abnormalities. Barium studies show a minimally dilated esophagus with beak-shaped narrowing. Manometry shows increased lower esophageal sphincter tone. Which of the following is the most likely diagnosis?

A 73-year-old woman is transferred to the hospital from the nursing home because of diverticulitis. A prior CT scan showed inflamed sigmoid colon. Transferred records indicate a 2-day history of fever and abdominal pain. On admission, her white count is 22,000/cmm, and she is started on IV antibiotics and IV fluids. Over the ensuing few days, her white count starts to come down and she has no nausea, vomiting or fever; however, she suddenly develops a cough and increasing abdominal pain. Abdominal examination shows guarding and tenderness in the left lower quadrant. An upright x-ray film of the chest shows free air under the left diaphragm. Which of the following is the most appropriate next step in management?

9. A 51-year-old obese male presents to your office complaining of difficulty swallowing solids but not liquids. His medical history is significant for GERD. Six months ago he was diagnosed with Barrett's esophagus. He reports that three months after the diagnosis of Barrett's esophagus, his heartburn resolved. Barium swallow now reveals an area of symmetric, circumferential narrowing affecting the distal esophagus. Which of the following best explains this finding?

10.Ms. Lee, a 62-year-old Chinese woman, comes with yellowness in her eyes for the past 6 weeks. She is generally feeling tired, has lost some weight, and occasionally had some nausea. She denies any altered bowel habits. She is a non-smoker but drinks 2-3 beers each night. Her dad is suffering from high cholesterol and also has had stroke. She had a dilatation and curettage for an abnormal pap smear 15 years ago. Her vitals are stable and she is afebrile. She has marked scleral icterus. An abdominal examination reveals normal bowel sounds and no organomegaly. Her stools were occult blood negative. Her liver function tests and enzymes were ordered and the results are Total protein 6.1 g/dl Albumin 39 g/dl AST 67U/L ALT 52U/L Alkaline phosphatase 290 U/L Total bilirubin 96 mg/dl Direct bilirubin 89 mg/dl Serum lipase is 46 U/L Anti-mitochondrial antibodies negative. Which of the following is the most likely cause of these findings?

11. A 23-year-old man comes to the physician because of a two-month history of loose stools, decreased appetite, and weight loss. He has no history of medical problems. He takes no medications. His temperature is 36.7C (98F), blood pressure is 120/76 mmHg, pulse is 90/min, and respirations are 16/min. Laboratory studies show: Hemoglobin 11.2 g/dL MCV 80 fl Leukocyte count 9,500/cmm Segmented Neutrophils 65% Bands 3% Eosinophils 1% Basophils 0% Lymphocytes 25% Monocytes 6% Platelets 550,000/cmm ESR 50 mm/hr Serum sodium 145 mEq/L Serum potassium 4.0 mEq/L Test of the stool for occult blood is positive. Which of the following is the most likely type of diarrhea in this patient?

12. A 35-year-old Hispanic male comes to the office because of excruciating pain during defecation for the past week. The pain is so severe that he avoids using the toilet. He also adds that he has noticed bright red blood in his stool. The caliber of his stool has not changed. His past medical history is significant for chronic constipation. Rectal examination shows a posterior mucosal tear of the anus. Which of the following is the most appropriate next step in management?

13. A 27 -year-old man complains of episodic abdominal pain. The pain is concentrated in the epigastrium and is gnawing in quality. It wakes him up during the night and is promptly relieved by a glass of water and a piece of bread. He denies vomiting or diarrhea, but has experienced an occasional "dark stool." He has no significant past medical history and does not take any medications. His family history is significant for biliary disease in his mother and stomach cancer in his father. He smokes one pack of cigarettes a day and consumes a can of beer almost every day. His vital signs are with in normal limits. Physical examination shows mild epigastric discomfort on deep palpation. Which of the following is most likely to provide long-term symptom relief in this patient?

14. A 66-year-old man presents with a four-week history of increasing back pain and severe constipation. He has no weakness or sensory symptoms in his legs. He takes acetaminophen for back pain, metoprolol for high blood pressure, and an over-the-counter fiber supplement for constipation. A screening colonoscopy 5-year ago was unremarkable. Rectal examination shows no abnormalities. Examination of the stool for occult blood is negative. His blood pressure is 135/80 mmHg and heart rate is 80/min. Abdominal examination shows no abnormalities. Laboratory studies show: Hb 9.5 g/dl WBC 7,000/cmm Platelets 300,000/cmm BUN 28 mg/dl Serum Creatinine 1.9 mg/dl, ESR 80/hr Which of the following is the best explanation for this patient's constipation?

15. A 26-year-old man presents with a 1-week history of intermittent, crampy, lower abdominal pain accompanied by rectal urgency, bloody diarrhea, nausea and vomiting. His symptoms have become more severe over the past 24 hours. His past medical history is unremarkable. He denies any recent travel or antibiotic use. His temperature is 38.5C (102.0F), blood pressure is 120/80 mm Hg, pulse is 95/min, and respirations are 15/min. Abdominal examination reveals distension and tenderness to palpation without rebound or guarding. The bowel sounds are decreased. Rectal examination shows marked rectal tenderness and mucus mixed with blood in the vault. An x-ray film of the abdomen shows distended colon filled with gas. Laboratory studies show: Hb 10.8 g/dl WBC 19,600/cmm Platelet count 459,000/cmm ESR 54/hr Which of the following is the most appropriate next step in management?

16. A 64-year-old white male with a history of severe stable angina and peripheral vascular disease undergoes coronary artery bypass surgery. His post-operative course is complicated by hypotension, which is treated successfully; however, a few hours later, he experiences abdominal pain followed by bloody diarrhea. His temperature is 37.8C (100 F), blood pressure is 110/60 mmHg, pulse is 110/min, and respirations are 20/min. Abdominal examination is benign. Laboratory studies show a WBC count of 15,000/cmm with 7% bands. The lactic acid level is elevated. A CT scan is ordered. Which of the following areas of the colon will most likely show abnormal findings?

17. A 49-year-old woman presents to the emergency department (ED) with profuse, foul-smelling, watery diarrhea and abdominal pain. Five days ago, she was hospitalized for urosepsis and treated with amoxicillin and sulbactam. She recovered well, and was discharged three days ago with a prescription for oral amoxicillin plus clavulanic acid. Her current temperature is 38.8C (101.9F), blood pressure is 110/70 mm Hg, pulse is 102/min, and respirations are 15/min. Abdominal examination shows tenderness in the left lower quadrant. CBC shows a WBC count of 25,000/microl. She is started on intravenous normal saline in the ED. Which of the following is the most appropriate next step in management?

18. A 52-year-old man presents to your office after passing a black stool. He also describes occasional abdominal discomfort and nausea but denies hematemesis. He says that food seems to help his abdominal pain, so he eats frequently during the day and keeps some snacks on his night stand. As a consequence, he has gained 5 pounds over the last year. He admits that his diet is lacking in vegetables and fruit. He drinks one to two cans of beer nightly, but does not smoke or use illicit drugs. He says that his father died of colon cancer and his mother died from a stroke. Physical examination reveals a right-sided carotid bruit. The fecal occult blood test is positive. Which of the following is the most likely cause of his condition?

19. A 35-year-old Caucasian female presents to your office with several months history of heartburn. She also describes a periodic 'sticking sensation' in her throat during the meal. Her past medical history is significant for asthma that is controlled with inhaled steroids, and acoustic neuroma that was removed 2 years ago. She does not smoke or consume alcohol. She denies any recreational drug use. She is not allergic to any medications. She works as a secretary at a private firm, and considers her work moderately stressful. Her family history is significant for breast cancer in her mother and prostate cancer in her father. Endoscopic evaluation shows mild hyperemia in the distal esophagus. Esophageal manometry reveals absent peristaltic waves in the lower two-thirds of the esophagus and a significant decrease in lower esophageal sphincter tone. Which of the following is the most likely cause of this patient's complaints?

20. A 34-year-old woman complains of occasional diarrhea and crampy lower abdominal pain. She says that at times her symptoms hamper her performance in important business meetings. The pain sometimes occurs after meals but is not always preceded by eating. The pain is often accompanied by diarrhea with small amounts of stool and mucus. Her past medical history is significant for bleeding hemorrhoids. Her mother died of colon cancer. Which of the following findings is most likely in this patient?

21. A 55-year-old obese male presents to his physician for a routine annual physical examination. A review of systems is insignificant, except for constipation which has been present for several years. He does not have major medical problems and is not on any prescription or over-the-counter medications. He has smoked one and- a-half packs of cigarettes daily for 30 years. He drinks 4 oz of alcohol daily. Physical examination is unremarkable. As part of the routine screening, a colonoscopy is performed, which shows multiple diverticuli at the sigmoid colon. He is concerned about the diverticulosis. Which of the following is the most appropriate next step in the management of this patient's diverticulosis?

22. A 40-year-old female presents with abdominal discomfort. The discomfort is localized to the center of the upper abdomen and is not related to meals or fatty food. She has a history of similar symptoms. She has not had gastrointestinal bleeding, fatigue, dysphagia, or weight loss. Her mother has a history of gastric ulcer. Her vital signs are within normal limits. Complete physical examination is unremarkable. Stool for heme occult is negative. Complete blood count and serum chemistries are within normal limits. Which of the following is the most appropriate next step in management?

23. A 64-year-old man is brought to the ER after an episode of coffee ground emesis followed by lightheadedness. He has been having black, tarry stools for the past few days. He has a history of coronary artery disease and he underwent coronary artery bypass surgery three years ago. He is currently taking aspirin, metoprolol, lisinopril, and pravastatin. He drinks 2-3 beers over the weekend but he quit smoking after the bypass surgery. His temperature is 36.7C (98F), pulse is 110/min, respirations are 16/min, and blood pressure is 90/60 mmHg. Examination shows coffee ground-like material in the oropharynx. His lungs are clear. Abdomen is slightly tender in the epigastrium. Laboratory studies show Complete blood count: Leukocyte count 9,500/mm3 Hemoglobin 8.1 g/L Platelets 130,000/mm3 Chemistry panel: Serum sodium 140 mEq/L Serum potassium 3.5 mEq/L Bicarbonate 27 mEq/L Blood urea nitrogen (BUN) 54 mg/dL Serum creatinine 1.2 mg/dL Which of the following is the most appropriate next step in management of this patient?

24. A 12-year-old girl comes to the physician for chronic weight loss and fatigue. She has a history of bulky, floating, foul-smelling stools, flatulence and meteorism. She also has bone pain and easy bruising. Laboratory studies show anemia with serum iron: 25 mg/dl, ferritin: 25 mg/dl and serum total iron binding capacity 600 mg/dl (normal 300-360 mg/dL); PT is 16 sec. Physical examination shows loss of subcutaneous fat, pallor, hyperkeratosis and abdominal distention; bowel sounds are increased. Which of the following is most likely associated with this patient's condition?

25. A 30-year-old woman presents with a 5-month history of episodic retrosternal pain that radiates to the interscapular region. The pain episodes typically last 15 minutes, and are precipitated by emotional stress and hot or cold food. Her relative gave her sublingual nitroglycerine tablets, which alleviated the pain. Her past medical history is unremarkable, and she does not take any other medications. There is no family history of coronary artery disease. Her vital signs are within normal limits. Physical examination shows no abnormalities. A lipid profile is within normal limits. An EKG shows a normal sinus rhythm. A stress test fails to reproduce the symptoms or to induce ST/T wave changes. Chest x-ray, upper GI endoscopy, and echocardiography show no abnormalities. Which of the following is the most appropriate next step in diagnosis?

26. A 45-year-old male comes to the physician for epigastric pain and diarrhea. His past medical history is significant for chronic duodenal ulcers. He has been smoking 2 packs of cigarettes daily for the past 10 years. He occasionally drinks alcohol. He denies illegal drug use or multiple sexual partners. Physical examination shows abdominal tenderness without rebound or rigidity. Endoscopy shows prominent gastric folds, chronic duodenal ulcer, and upper jejunal ulceration. Which of the following is the most appropriate next step in the diagnosis of this patient?

27. A 42-year-old male comes to the physician's office for evaluation of skin rash and hair loss. He has a long history of Crohn's disease and has had extensive small bowel resection resulting in short bowel syndrome. He is currently receiving total parenteral nutrition. When he does try to eat, he complains that the food does not taste good. His vital signs are stable. Examination shows alopecia and bullous, pustular lesions around the perioral and periorbital areas. Which of the following is the most likely cause of his current symptoms?

28. A 32-year-old female from South America presents with a 3-month history of progressive difficulty with swallowing for both liquids and solids. At night she has a bitter taste in her mouth. Over the past two months, she has had a 10 lb (4.54 kg) weight loss. She has not had any previous illnesses, and does not take any medication. Physical examination is unremarkable. A lateral x-ray film of the chest shows extreme dilatation of the esophagus with an air fluid level. Which of the following is the diagnostic test for this patient's condition?

29. A 45-year-old Hispanic male comes to the emergency department because of a two-day history of intermittent abdominal pain and bloody diarrhea. He has had four similar episodes in the past year. He is subsequently admitted to the floor. Radiographic and endoscopic evaluations show extensive disease from the terminal ileum to the rectum with multiple ulcerations and pseudopolyps. Biopsy of the lesion shows noncaseating granulomas and crypt abscess. Which of the following is the most characteristic feature which favors the diagnosis of Crohn's disease against that of ulcerative colitis?

30. A 50-year-old female presents with heartburn and gnawing abdominal pain. She was diagnosed with peptic ulcer disease 3 years ago, but she has been non-adherent to her medications. She asks you if her nonadherence puts her at increased risk of any complications. Which of the following is the most common complication of peptic ulcer disease?

31. A 56-year-old woman with cirrhosis presents with a 2-week history of increasing abdominal distension. She has mild encephalopathy and esophageal varices without bleeding. Her cirrhosis is due to chronic hepatitis type B. She has a past history of ascites treated successfully with conservative management. She is currently on sodium, water and protein restriction, maximal doses of spironolactone and furosemide, and lactulose. Her temperature is 36.6C (97.9F), blood pressure is 120/70 mm Hg, pulse is 80/min, and respirations are 30/min. She has a flapping tremor and labored breathing. Abdominal examination shows marked abdominal distension. An x-ray film of the chest is unremarkable. Abdominal ultrasound shows peritoneal fluid and splenomegaly, liver hyperechogenicity and nodularity, and portal vein width of 16 mm; no masses are evident. Which of the following is the most appropriate next step in the management of this patient's ascites?

32. A 44-year-old male who has had an extensive small bowel resection for Crohn's disease has been on total parenteral nutrition for two years. He presented to the hospital with epigastric and right upper quadrant pain. He has been taking azathioprine. His vital signs are within normal limits. Physical examination shows mild right upper quadrant tenderness. An ultrasonogram shows several gallstones; an ultrasonogram performed two years ago did not demonstrate gall stones. Which of the following is the most likely cause of his gallstones?

34. A 50-year-old man presents with a 3-hour history of right arm pain. Two weeks ago, he was treated for superficial thrombophlebitis of the right cephalic and right saphenous veins. For the past two months, he has had significant back pain, which is being treated with NSAIDs. His temperature is 37.0C (98.6F), blood pressure is 140/80 mm Hg, pulse is 70/min, and respirations are 10/min. Physical examination shows a swollen, ruddy and warm right arm, but is otherwise unremarkable. Cervical and chest x-ray films show no abnormalities. Laboratory studies show: Hct 50% Platelets 120,000/cmm WBC 9,600/cmm Neutrophils 60% Eosinophils 2% Basophils 0% Lymphocytes 31% Monocytes 7% PT 25 sec PTT 39 sec Fibrinogen 300 mg/dL Fibrin split products positive Which of the following is the most appropriate next step in management?

36. A 43-year-old man is evaluated for a one-year history of chronic abdominal pain. He describes episodes of epigastric and left upper quadrant pain that last for hours and are not relieved by antacids. Certain foods can precipitate the pain. He also complains of occasional diarrhea. The patient has lost 10 pounds over the last 6 months. Four years ago he was hospitalized for three days with acute abdominal pain. He smokes one pack of cigarettes a day and consumes alcohol regularly. His family history is significant for diabetes mellitus in his mother and prostate cancer in his father. Which of the following is most likely to diagnose this patient's condition?

37. A 50-year-old woman comes to clinic due to several episodes of severe watery diarrhea for the past 15 days. There is 4/10 pain all over her abdomen but she has not noticed any blood in her stools. She has normal diet and has not travelled anywhere recently. She denies any one around her having similar complaints. She also had occasional cramps in her leg muscles and feels dehydrated. She smokes one to two cigarettes a day and drinks socially. Her temperature is 36.8C (98.1F), blood pressure is 108/64 mm Hg, pulse is 118/min, and respirations are 18/min. On examination her abdomen is slightly tender. Laboratory results are as follows. WBC 5600mm3 Hemoglobin 13.6 Hematocrit: 41%, Platelets 209,000mm3 Sodium 138mEq/L Potassium: 2.1mEq/L Bicarbonate: 35mEq/L Blood urea nitrogen: 16 mg/dl Creatinine: 0.8 mg/dl Glucose 106 mg/dl A CT abdomen is ordered which shows a mass in the head of pancreas. What is the most probable diagnosis?

38. A 37 -year-old male is brought to the emergency department due to an episode of hematemesis. He has a history of peptic ulcer disease. A nasogastric tube lavage yields coffee-ground-like material. Physical examination reveals pallor and delayed capillary refill, without cyanosis. His temperature is 36.7C (98F), blood pressure is 85/40 mm Hg, pulse is 125/min, and respirations are 18/min. Which of the following is the most appropriate first step in management?

39. A 35-year-old Caucasian male presents to the emergency department with two episodes of bloody vomiting which occurred one-half hour ago. He has a history of migraines. For the past two days, he has been having severe headaches and has taken 20 tablets of aspirin without relief. He then resorted to heavy drinking and forgot about the pain. He drinks alcohol "occasionally" and has been smoking 1 pack of cigarettes daily for the past 18 years. Which of the following is the most likely explanation for this patient's hematemesis?

40. A 52-year-old woman with cirrhosis presents with increasing abdominal distension. Her treatment regimen was amended three days ago, when furosemide was added to spironolactone and sodium/water restriction. However, her distension persists, and today she is very somnolent and has passed very little urine. Her past medical history is remarkable for chronic hepatitis type B, cirrhosis, encephalopathy, and 2 bleeding episodes from esophageal varices; the bleeding was controlled with sclerotherapy. Her temperature is 36.5C (97.6F), blood pressure is 90/60 mm Hg, pulse is 80/min, and respirations are 18/min. Abdominal examination shows distension, shifting dullness, and no tenderness; bowel sounds are present. Laboratory studies show: Hemoglobin 11.0 g/L Leukocyte count 3,500/mm3 Serum sodium 125 mEq/L Serum potassium 5.5 mEq/L Chloride 103 mEq/L Blood urea nitrogen 60 mg/dL Serum creatinine 1.8 mg/dL Prothrombin time 18 sec Partial thromboplastin time 35 sec Urinalysis shows no abnormalities. Ultrasound of the kidney is unremarkable. Which of the following is the most appropriate next step in management?

41. An 83-year-old woman presents with a 1-year history of progressively severe crampy abdominal pain after eating. She has started avoiding food because of the pain. The pain is often associated with bloating, nausea, and occasional diarrhea. She has had a 15 kg (331b) weight loss over the past year. Her other medical problems include hypertension, diabetes mellitus-type 2, hypercholesterolemia, peripheral vascular disease, coronary artery disease and myocardial infarction. Social history is not significant. Abdomen is soft, nontender and non-distended. Abdominal x-ray and CT scan are unremarkable. Which of the following is the most likely diagnosis?

42. A 45-year-old Asian-American female comes to the physician due to bloating, flatulence, abdominal cramps and explosive watery diarrhea. These symptoms occur after ingesting dairy products. She has not had any weight loss. She has not had bone pain or easy bruising. Physical examination shows abdominal distention and borborygmi. You decide to investigate the patient further. Which of the following test results is most likely to be observed?

43. A 50-year-old male undergoes vagotomy and pyloroplasty for a peptic ulcer perforation. His early postoperative course is complicated by fever and hypotension, which are treated with broad-spectrum antibiotics and IV fluid support. He then recovers well; however, on post-operative day 6 he develops nausea, vomiting, abdominal pain, and profuse, watery diarrhea. His temperature is 38.9 C (102 F), blood pressure is 110/70 mmHg, pulse is 120/min, and respirations are 18/min. Abdominal examination shows tenderness in the sigmoidal area. Test of the stool for occult blood is negative. Laboratory studies show: Hb 11.5g/dL Platelet count 180, 000/cmm Leukocyte count 17, 500/cmm Segmented neutrophils 75% Bands 10% Eosinophils 1% Lymphocytes 14% Which of the following is the most appropriate next step in management?

44. A 65-year-old woman presents with painless intermittent rectal bleeding. The bleeding is bright red in color. She does not have abdominal pain, nausea, or vomiting. She has a history of hypertension, diabetes mellitus, and hypercholesterolemia. Her temperature is 36.7C (98 F), blood pressure is 140/80 mmHg, pulse is 80/min, and respirations are 16/min. Physical examination shows a systolic ejection murmur in the right second intercostal space; examination is otherwise unremarkable. Sigmoidoscopy shows no abnormalities. Which of the following is the most likely diagnosis?

45. A 45-year-old white male comes to your office for evaluation of diarrhea of 8-months duration. He says that he has lost almost 15 lbs during the past 8 months. He denies any blood in the stools. 24-hour stool collection reveals fecal fat of 10 gm/day. Stool microscopy reveals no pathogens and no leucocytes. D-xylose test was performed which shows that less than 2 grams of D-xylose is excreted in urine in 5 hours. D-xylose test was re-performed after 4-week treatment with antibiotics but excretion is still less than 2 grams in 5 hours. Based on these findings, what is the most likely diagnosis in this patient?

46. A 27 -year-old male presents with a history of intermittent abdominal distention, flatulence and greasy stools. He also complains of fatigue. He has no other medical problems. His family history is unremarkable. He does not use tobacco, alcohol or smoking. His vital signs are within normal limits. Physical examination shows a pruritic, papulovesicular rash over the extensor surfaces of the extremities and over the trunk, scalp and neck. His abdomen is soft, nontender and non-distended. Stool for occult blood testing is negative. Lab studies show: Hemoglobin 10.0 g/L MCV 75 fl Platelets 340,000/mm3 Leukocyte count 4,500/mm3 Neutrophils 56% Eosinophils 1% Lymphocytes 33% Monocytes 10% Which of the following is the most likely diagnosis of his skin condition?

47. A 68-year-old woman with a history of heavy alcohol use and chronic pancreatitis presents with a several month history of recurrent epigastric pain. The pain is occasionally associated with nausea and vomiting. She has lost 15 lbs (6.8 kg) over the past 3 months. She is afebrile. Physical examination shows scleral icterus. Laboratory studies show: Albumin 3.0 mgldl Total bilirubin 3.5 mgldl Direct bilirubin 24 mgldl Alkaline phosphatase 220 U/L Aspartate aminotransferase (SGOT) 28 U/L Alanine aminotransferase (SGPT) 25 U/L Amylase 145 U/L Lipase 100 U/L Which of the following is the most appropriate next step in management?

48. A 29-year-old male with a 6-year history of HIV infection presents with chronic, severe diarrhea associated with malaise, nausea, anorexia and abdominal cramps. His last CD4 count was 80cells/mm3. A modified acid-fast stain of a stool specimen shows 4-6 mm oocysts. Which of the following is the most likely microorganism responsible for this condition?

49. A 56-year-old man comes to the emergency department due to a one-day history of abdominal pain and increasing distension. He has not passed flatus during this time. He has had nausea without vomiting. He has a history of cirrhosis secondary to chronic alcoholism. He is taking spironolactone and furosemide. His temperature is 38.0C (101.3F), blood pressure is 120/70 mm Hg, pulse is 100/min, and respirations are 24/min. Physical examination shows a slightly confused man with a flapping tremor. Breathing is labored and lungs are clear to auscultation. Abdominal examination shows distension, tenderness to palpation with rebound, and no guarding; a fluctuating wave and shifting dullness are present. Abdominal auscultation shows splashing and markedly decreased bowel sounds. An x-ray film of the chest shows no abnormalities. An x-ray film of the abdomen shows gas in the small and large bowels without air-fluid levels. Which of the following is the most appropriate next step in management?

50. A 49-year-old woman presents with a two-week history of lower abdominal pain and severe diarrhea. The stools are watery without blood or mucus. The abdominal pain is mild and unrelated to her stools. She has had recent episodes of flushing. She has not had fever. There is no history of travel. She does not smoke or drink alcohol. Her past surgical history includes a fracture repair of her right leg 3 years ago. Her temperature is 36.6C (97.8F), blood pressure is 106/68 mm Hg, pulse is 103/min, and respirations are 20/min. Oxygen saturation is 99% on room air. Physical examination shows facial flushing, a prominent jugular venous pulse and expiratory wheezes. Which of the following is the most likely diagnosis?

51. A 42-year-old male presents with a 2-year history of heartburn. The heartburn occurs after heavy meals and while supine. Over time, his symptoms have been increasing in severity and frequency. His symptoms used to be alleviated with the use of over-the-counter antacids, but these have become ineffective in the past two months. He also complains of epigastric pain and occasional vomiting, both of recent onset, especially in the morning. He denies dysphagia or odynophagia. He eats junk food and drinks two cups of coffee daily. He regularly drinks grape brandy and smokes 1 pack of cigarettes/day. Abdominal examination shows epigastric tenderness. Abdominal ultrasound is unremarkable. Test of the stool for occult blood is negative. Which of the following is the most appropriate next step in management?

52. A 45-year-old Caucasian male presents with a 2-year history of progressive heartburn which is most severe while supine. Over-the-counter antacids have not relieved his symptoms. Endoscopy shows a hiatal hernia. The patient is reluctant to accept any treatment. Which of the following is he at risk for if his condition is left untreated?

53. A 34-year-old Caucasian male presents to the office with a 4-week history of diarrhea. He just returned from a trip to South America, where he developed foul-smelling stools, abdominal cramps and bloating. A three-day course of ciprofloxacin did not relieve his symptoms. His vital signs are within normal limits. Physical examination shows no abnormalities. Which of the following is the most appropriate next step in management?

54. A 55-year-old male comes to the physician with a history of diarrhea, weight loss, bloating, and excessive flatulence. His symptoms began soon after having "stomach surgery" two years ago. He has a history of gastric ulcers. Physical examination shows scarring associated with past surgery, and abdominal distention with identifiable succussion splash. Laboratory studies show anemia with MCV of 100fl. Which of the following is the most likely diagnosis?

55. A 45-year-old male comes to the physician with a 6-month history of periodic abdominal pain. He tried several over-the-counter medications including H2 blockers and proton pump inhibitors with moderate success. Workup, including an upper GI series and endoscopy, showed multiple duodenal ulcers and a single jejunal ulcer. Test of the stool for occult blood is positive. Test of the stool for fat is positive. Which of the following is the best explanation for this patient's impaired fat absorption?

56. A 66-year-old man returns to the emergency department (ED) for a second time because of persistent left lower quadrant pain and developing fever, despite 48 hours of oral antibiotics. He had presented to the ED 2 days ago because of left lower quadrant pain. He was able to tolerate a diet and had no fever; he was then sent home on antibiotics, and instructed to return if there was no improvement. He has a 2-week history of constipation without regular bowel movements. Laxatives have not relieved his symptoms. His diet consists of meat with very few vegetables. His vital signs are within normal limits, except for a low-grade fever. Abdominal examination shows left lower quadrant tenderness and guarding. Rectal examination shows no abnormalities. Laboratory studies show a WBC of 16,400/cmm. He is admitted and started on IV antibiotics. Forty-eight hours later, his symptoms persist without any improvement. Which of the following is the most appropriate next step in management?

57. A 58-year-old man presents with a one-year history of diarrhea. The stools are watery and accompanied by abdominal cramps. He denies any fever, blood per rectum, or foul-smelling stools. He has also experienced frequent episodes of dizziness, flushing, wheezing, and a feeling of warmth. He has taken herbal medicines, which failed to relieve his symptoms. He is depressed about his illness, and feels hopeless about diagnosis and treatment. He appears ill. Auscultation of the chest shows a 2/6 systolic murmur over the left lower sternal border. Abdominal examination shows hepatomegaly 3cm below the right costal margin, mild shifting dullness, and no abdominal tenderness. Laboratory studies show: Hb 13.0gm/dl MCV 90fl WBC 6,100/cmm Platelets 210,000/cmm AST101 U/L ALT 99 U/L Alkaline phosphatase 400 mg/dl This patient is at risk of developing a deficiency of which vitamin or mineral?

58. A 50-year-old female presents with a 3-year history of abdominal pain and diarrhea. She has not been evaluated by a physician. Recently, her symptoms have been progressively worsening. Endoscopy shows multiple ulcerations of the duodenum and prominent gastric folds. Secretin stimulation test shows increased gastrin secretion. Which of the following is most likely associated with this patient's condition?

59. A 58-year-old woman presents to the emergency department with right subcostal heaviness, intermittent pain, food intolerance, and 13.2 lbs-weight loss (6kg) over the past 2 months. Her pain has been worsening for the past 2 days; it was initially localized to the right upper quadrant, but has now shifted to her back. Her past medical history is remarkable for appendicitis, which was complicated by perforation and peritonitis 20 years ago. Abdominal examination shows epigastric tenderness. There is a palpable mass below the right costal margin. Murphy's sign is negative. Abdominal ultrasound shows an enlarged gallbladder and dilation of the hepatic ducts. Laboratory studies show: WBC 11,000/cmm Total bilirubin 24 mg/dl Direct bilirubin 1.6 mg/dl Alkaline phosphatase 310 U/L Aspartate aminotransferase (SGOT) 87 U/L Alanine aminotransferase (SGPT) 56 U/L Amylase 140 U/L Which of the following is the most appropriate next step in management?

60. A 50-year-old white male presents with complaints of bitter taste and central chest pain. He further describes he pain as moderate-to-severe, occurring during or after meals, non-radiating, and burning. The pain is relieved with antacids, and worsened by lying supine. He has lost 10 lbs (4.5kg) over the past 5-months (unintentional). He has smoked 2 packs of cigarettes daily for 20 years. His vital signs are stable, and he is afebrile. The physical examination is unremarkable. Chest x-ray and EKG show no abnormalities. Which of the following is the most appropriate next step in management?

61. A 63-year-old man presents with a 2-month history of dysphagia for both solids and liquids. He has had a 6.6 lb (3kg) weight loss over this time. His past medical history is remarkable for a transient ischemic attack 6 months ago, two bouts of pneumonia in the past 3 months, and chronic heartburn treated with over-the-counter antacids. Physical examination shows a supple neck without masses. Abdominal examination shows mild epigastric tenderness to deep palpation. Chest x-ray is normal for his age. Which of the following is the most appropriate next step in diagnosis?

62. A 27-year-old Caucasian woman presents with abdominal pain, diarrhea and a 4.5 (2kg) weight loss for the past two months. She describes the abdominal pain as intermittent, moderate-to-severe, and located in the right lower quadrant. Over the past 48 hours, the pain has intensified. Her temperature is 37.6C (99.6F), blood pressure is 120/70 mm Hg, pulse is 100/min, and respirations are 14/min. Several shallow ulcers are present in her mouth. Abdominal examination shows tenderness in the right lower quadrant without rebound. Rectal examination shows mucus. Rectosigmoidoscopy is unremarkable. An x-ray film of the abdomen shows gas in the small and large bowels. Laboratory studies show: Hb 10.2 g/dL WBC 16,500/cmm Platelet count 530,000/cmm ESR 48/hr Which of the following is the most likely diagnosis?

63. A 65-year-old man treated for heart failure with enalapril and digoxin presents to the emergency department (ED) with palpitations. His blood pressure is 160/ 100 mmHg, and heart rate is 110/min. His rhythm is irregular. His lungs are clear on auscultation. His abdomen is soft and non-distended. Mild epigastric tenderness is elicited on deep palpation. ECG shows atrial fibrillation without acute ischemic changes. Cardiac enzyme levels are normal. Treatment with warfarin and verapamil is initiated, and the patient is eventually discharged home. After two weeks, he returns to the ED to complain of profound anorexia. Which of the following is the most likely cause of his current complaint?

64. A 65-year-old Caucasian male presents to your office with a several month history of difficulty swallowing. He has noticed a right-sided neck mass which increases in size while drinking fluids. His past medical history is significant for hypertension, gastroesophageal reflux disease, and osteoarthritis of his right knee. His current medications include hydrochlorothiazide, ranitidine, and occasional naproxene. You order a barium examination of the esophagus to visualize the abnormality. Which of the following is the most important pathogenetic factor in the development of this patient's problem?

65. A 52-year-old Caucasian male comes to you for a routine health check-up. You decide to do age-appropriate screening in this patient and order a colonoscopy. The colonoscopy is normal, except for a 1.5cm polyp in the left descending colon. A colonoscopic polypectomy is done and the biopsy results are pending. The patient is anxious to know the expected biopsy results and the risk of cancer. Which of the following types of polyps is considered to be most premalignant?

66. A 47 -year-old male comes to the emergency department complaining of an intense burning pain in his abdomen. The pain started a couple of hours ago and is getting worse. He also has nausea and vomited twice. The vomitus is described as dark red-brown in color. He drank "quite a bit of alcohol' last night. He has had several episodes of this type of pain before, and was diagnosed with peptic ulcer disease five years ago. Several courses of H. Pylori eradication therapy have been prescribed in the past, but the patient admits to being non-compliant. He admits to smoking and drinking heavily. His temperature is 36.8 C (98.2 F), blood pressure is 126/88 mm Hg, pulse is 98/min, and oxygen saturation is 96% on room air. The physical examination is remarkable for marked epigastric tenderness. No masses or rebound tenderness are appreciated. IV fluids are administered, blood tests are taken, and upper GI endoscopy is being arranged. Which of the following serum markers is most likely to be elevated in this patient?

67. A 65-year-old male complains of fatigue for the past one month. He has been living alone since the death of his wife one year ago. He does not like to cook, and his diet consists mostly of canned food, hot tea, and toast. He drinks one glass of white wine nightly with dinner. Examination shows pallor of the skin, nail beds and conjunctiva. Rectal exam is heme-negative. His physical examination is otherwise unremarkable. Administration of which of the following would be most helpful in treating his condition?

68. A 50-year-old white male comes to the physician's office because of diarrhea, abdominal pain and weight loss. He has bulky, foul-smelling stools, abdominal distension and flatulence. He also has arthralgias and a chronic cough. His temperature is 37.8C (100F), blood pressure is 120/80 mm Hg, pulse is 80/min, and respirations are 18/min. Physical examination shows generalized lymphadenopathy, skin hyperpigmentation and a diastolic murmur in the aortic area. Small bowel biopsy shows villous atrophy with numerous PAS-positive materials in the lamina propria. Which of the following is the most likely diagnosis?

69. A 65-year-old Asian male presents to the physician with a four-week history of weakness and vague postprandial epigastric pain. His past medical history is insignificant. He does not take any medications. He smokes 1½packs of cigarettes daily and drinks alcohol occasionally. The fecal occult blood test is positive. Gastroduodenoscopy shows an antral ulcer. Four of seven biopsies taken from the margins of the ulcer are consistent with adenocarcinoma. Which of the following is the most appropriate next step in management?

70. A 20-year-old male university student presents with a one-month history of 4 to 6 loose watery bowel movements per day with occasional tenesmus, urgency, and abdominal cramps. He also describes a two-week history of intermittent bright red blood per rectum. His appetite and energy levels are excellent and his weight is stable. He is otherwise healthy and takes no medications. His family history is unremarkable. He has not recently used antibiotics nor has he traveled outside the country. He does not use tobacco, alcohol or drugs. Sigmoidoscopy demonstrates mild erythema and rectal biopsy confirms acute mucosal inflammation. Which of the following is a potential complication of this condition requiring regular surveillance?

71. A 27 -year-old male returning home after a three-month visit to Puerto Rico presents with diarrhea for the past 6 weeks. Other accompanying symptoms include cramps, gas, fatigue and progressive weight loss. Abdominal auscultation shows hyperactive bowel sounds, and borborygmi. The family history is unremarkable for intestinal disease. Laboratory studies show anemia with a hematocrit of 25% and MCV of 105fl; stool examination for ova and parasites is negative. Small intestinal mucosal biopsy shows blunting of villi with infiltration of chronic inflammatory cells, including lymphocytes, plasma cells, and eosinophils. Which of the following is the most likely diagnosis?

72. A 46-year -old alcoholic man comes to the emergency department because of several episodes of vomiting. The last episode of emesis contained blood. Five hours ago, he had a fatty meal and several alcoholic drinks. Two days ago, he had an upper GI tract endoscopy and abdominal ultrasound for the evaluation of dyspepsia. The endoscopy was unremarkable, and the ultrasound showed a hyperechogenic enlarged liver and stones in the gallbladder. His temperature is 36.6C (97.9F), blood pressure is 120/70 mm Hg, pulse is 95/min, and respirations are 15/min. Laboratory studies show: Hb 12.8 g/dl WBC 5,400/cmm BUN 26 mg/dl Creatinine 1.1 mg/dl AST 100 U/L ALT 45 U/L Bilirubin 0.7 mg/dl Nasogastric suction shows normal stomach contents mixed with bright red blood. The rectal examination shows no melena. Which of the following is the most likely explanation for this patient's bloody vomiting?

73. 45-year-old male presents to the office with complaints of progressive difficulty in swallowing both solids and liquids. His other complaints include occasional regurgitation of undigested food, and a nighttime cough which disturbs his sleep. The physical examination is unremarkable. Barium studies show a dilated esophagus, loss of esophageal peristalsis, and smooth tapering of the distal esophagus. Which of the following is the most appropriate next step in management?

74. A 53-year-old woman presents to your office with right-sided abdominal pain that started two days ago. She describes the pain as constant and burning in nature. There is no associated nausea, vomiting or diarrhea. The patient reports taking over-the-counter antacids and ibuprofen, which brought no relief. Her medical history is significant for breast cancer diagnosed one year ago, for which she underwent a modified radical mastectomy and is receiving chemotherapy, the last course of which was completed two months ago. On physical examination, her temperature is 36.7C (98.F), blood pressure is 120/70 mm Hg, pulse is 80/min, and respirations are 16/min. Her lung fields are clear to auscultation and her abdomen is soft and non-distended. The liver span is 10 cm and the spleen is not palpable. Lightly touching the skin to the right of the umbilicus elicits intense pain. In one week the patient is most likely to develop:

75. A 76-year-old man with multi-infarct dementia is brought to the emergency department because of lethargy. For the past 6 months, he has had difficulties with feeding and occasionally regurgitates undigested food. In recent days, his condition has deteriorated, and he has become lethargic. He has a history of hypertension for 15 years, chronic atrial fibrillation for 7 years, dementia for 5 years, and frequent respiratory tract infections for the past year. His temperature is 37.8C (101.5F), blood pressure is 150/95 mm Hg, pulse is 120/min, and respirations are 26/min. Physical examination shows foul-smelling breath; there is a fluctuating mass in the left side of his neck. Auscultation shows crackles in the right lung base. An x-ray film of the chest shows multiple infiltrates without cavitation in the right lower lung field. The patient is admitted, sputum and blood cultures are sent, and antibiotics are started. Which of the following is the most appropriate next step in management?

76. A 69-year-old man has had pain in left lower quadrant (LLQ) for 3 days. The pain was intermittent, but since yesterday it has been constant. He also had sweating and chills for the last 2 days. He hasn't had a bowel movement for 4 days, but has passed flatus. He vomited once and still has nausea. His past medical history is remarkable for constipation and nephrolithiasis. His vital signs are: PR: 110/min; BP: 122/80mm Hg; RR: 24/min; Temperature: 38.6C (101.3F). His abdomen is soft and tender to palpation in the left lower quadrant. Deep palpation is difficult but reveals no masses or organomegaly. Bowel sounds are decreased. Rectal exam is positive for enlarged prostate. Costovertebral angle tenderness is absent. Ultrasound shows bilateral hydronephrosis and stones in the kidneys. His laboratory test results are: WBC 14,500/cmm Hb 11.7gm/dl Hct 34% ESR 40/hour BUN43 mg/dl Creatinine 2.0 mg/dl Urinalysis RBC 4-10/hpf; WBC 3/hpf; few hyaline casts; many oxalate crystals. The next step should be:

77. A 33-year-old male is admitted to the hospital after an episode of tonic-clonic seizures. He is a known IV drug abuser. He admits 'shooting' cocaine and heroin prior to the seizure. He has never had seizures before. Fallowing the seizure, he complains of muscle pain but otherwise feels normal. His temperature is 37.2°C (98.9°F) and his blood pressure is 156/90 mm Hg. Laboratory analyses reveal the following: CPK 11,200 U/ml AST 545 U/L ALT 560U/L Troponin T normal Anti-HAV antibodies negative HBsAg negative Anti-HBsAg negative Anti-HCV antibodies positive He reports that a recent HIV test was negative. Which of the following is the best management for this patient?

78. A 46-year-old white male presents with chronic diarrhea, abdominal distention, flatulence, and weight loss. He also has arthralgias and bulky, frothy stools. He has never had blood transfusions, tattooing or highrisk sexual behaviors. His temperature is 38.3C (101F), blood pressure is 130/90 mm Hg, pulse is 84/min, and respirations are 16/min. Physical examination shows generalized lymphadenopathy and skin hyperpigmentation Which of the following is the most appropriate diagnostic test?

79. A 40-year-old male comes to the physician complaining of diarrhea with pale, voluminous, foul-smelling stools that are difficult to flush. He has had this problem sporadically for years, but has neglected medical care. He also has severe, intermittent, epigastric pain lasting 15 to 30 minutes after eating. He admits to chronic alcohol consumption. Physical examination shows no abnormalities. Which of the following is the best test to confirm fat malabsorption in this patient?

80. A 37-year-old male prisoner has been complaining of fever, chills and abdominal pain over the last week. He vomited once before reaching the emergency room. On physical examination, his blood pressure is 112/63 mmHg and his heart rate is 115/min. Breath sounds are diminished at the left lung base and there is marked left upper quadrant tenderness. Laboratory values are given below: WBC count 23,500/mm3 Neutrophils 65% Bands 11% Hemoglobin 12.5 mg/dL Platelets 250,000/mm3 Total bilirubin 3.1 mg/dL AST 46 units/L AL T 70 units/L Alkaline phosphatase 120 units/L CT scan of the abdomen reveals a fluid collection within the spleen. Which of the following is the most likely diagnosis?

81. A 20-year-old Caucasian male presents with lower abdominal pain for the past few hours. The pain first started around the umbilicus, but then shifted to the right lower abdominal area. He has had one episode of vomiting. Physical examination shows tenderness at McBurney's point. CT scan of the abdomen confirms the diagnosis of acute appendicitis. Which of the following explains the pathophysiology of the shifting of pain from the peri-umbilical area to the right lower quadrant in acute appendicitis?

82. A 40-year-old female presents with a 12-month history of episodes of chest pain and dysphagia. The episodes last from a few seconds to a few minutes. She has not had weight loss, fevers or chills. Chest-x ray, ECG and barium swallow show no abnormalities. Manometric studies show simultaneous high amplitude contractions with normal relaxation of the lower esophageal sphincter. Which of the following is the most likely diagnosis?

83. A 29-year-old man presents to the ED complaining of RLQ pain for 24 hours. He states that the pain first began as a dull feeling around his umbilicus and slowly migrated to his right side. He has no appetite, is nauseated, and vomited twice. His BP is 130/75 mm Hg, HR is 95 beats per minute, temperature is 100.9°F, and his RR is 16 breaths per minute. His WBC is 14,000/μL. As you palpate the LLQ of the patient’s abdomen, he states that his RLQ is painful. What is the name of this sign?

84. A 40-year-old man with long-standing alcohol abuse complains of abdominal swelling, which has been progressive over several months. He has a history of gastrointestinal bleeding. On physical examination, there are spider angiomas and palmar erythema. Abdominal collateral vessels are seen around the umbilicus. There is shifting dullness, and bulging flanks are noted. Which of the following is the most important first step in the patient’s evaluation?

85. A 70-year-old man presents with a complaint of fatigue. There is no history of alcohol abuse or liver disease; the patient is taking no medications. Scleral icterus is noted on physical examination; the liver and spleen are nonpalpable. The patient has a normocytic, normochromic anemia. Urinalysis shows bilirubinuria with absent urine urobilinogen. Serum bilirubin is 12 mg/dL, AST and ALT are normal, and alkaline phosphatase is 300 U/L (three times normal). Which of the following is the best next step in evaluation?

86. A 54-year-old man is brought to the ER because of an episode of coffee ground emesis and lightheadedness. He has a history of intravenous drug use, hepatitis C infection, and alcohol use. He says he has not had an alcoholic drink for about three days. He has been noncompliant with medications and follow-ups. He takes no medications. His temperature is 36.7C (98F), pulse is 110/min, respirations are 16/min, and blood pressure is 90/60 mmHg. Scleral icterus is present. Examination shows coffee ground material in the oropharynx. His lungs are clear. His abdomen is distended and a fluid wave is present. He is slightly tender to palpation in the epigastrium. Laboratory studies show: Complete blood count: Leukocyte count 9,500/mm3 Hemoglobin 10.0 g/L Platelets 120,000/mm3 Chemistry panel: Serum sodium 140 mEq/L Serum potassium 3.5 mEq/L Bicarbonate 27 mEq/L Blood urea nitrogen (BUN) 34 mg/dL Serum creatinine 0.8 mg/dL Coagulation studies : Prothrombin time 27 sec Partial thromboplastin time 42 sec Which of the following is the most appropriate next step in the management of this patient?.

87. A 55-year-old man with hypertension and end-stage renal disease requiring hemodialysis presents with 2 days of painless hematochezia. He reports similar episodes of bleeding in the past, which were attributed to angiodysplasia. He denies abdominal pain, nausea, vomiting, diarrhea, and fever. His vitals include HR of 90 beats per minute, BP of 145/95 mm Hg, RR of 18 breaths per minute, and temperature of 98°F. His abdomen is soft and nontender and his stool is grossly positive for blood. Which of the following statements are true regarding angiodysplasia?

88. A 70-year-old woman presents to the ED with dark stool for 3 weeks. She occasionally notes bright red blood mixed with the stool. Review of systems is positive for decreased appetite, constipation, and a 10-lb weight loss over 2 months. She denies abdominal pain, nausea, vomiting, and fever, but feels increased weakness and fatigue. She also describes a raspy cough with white sputum production over the previous 2 weeks. Examination reveals she is pale, with a supine BP of 115/60 mm Hg and HR of 90 beats per minute. Standing BP is 100/50 mm Hg, with a pulse of 105 beats per minute. Which of the following is the most likely diagnosis?

89. A 52-year-old man has episodes of severe chest pain associated with dysphagia. He has been seen twice in the emergency room, and both times the symptoms responded to sub-lingual nitroglycerin. He then had a full cardiac evaluation including electrocardiogram (ECG), cardiac biomarkers, and an exercise stress test, which were all normal. Which of the following is the most likely diagnosis?

90. A 16-year old girl has recently been referred to your family practice. She is a recent immigrant from Southeast Asia, and has been taking isoniazid (INH) and rifampin for uncomplicated tuberculosis. Routine blood tests are unremarkable, except for an elevated direct bilirubin. Other liver enzymes and function tests are completely normal. Which of the following is the most likely diagnosis?

91. A 45-year-old woman presents with a 1-week history of jaundice, anorexia, and right upper quadrant discomfort. On examination she is icteric, with a tender right upper quadrant and liver span of 14 cm. There is no shifting dullness or pedal edema and the heart and lungs are normal. On further inquiry, she reports consuming one bottle of wine a day for the past 6 months. Which of the following lab- oratory tests are most likely to be characteristic of a patient with jaundice secondary to alcoholic hepatitis?

92. A husband and wife present to the ED with 1 day of subjective fever, vomiting, watery diarrhea, and abdominal cramps. They were at a restaurant a day before for dinner and both ate the seafood special, which consisted of raw shellfish. In the ED, they are both tachycardia with temperatures of 99.8°F and 99.6°F for him and her, respectively. Which of the following is responsible for the majority of acute episodes of diarrhea?

93. A 78-year-old woman is brought to the ED by EMS complaining of vomiting and abdominal pain that began during the night. EMS reports that her BP is 90/50 mm Hg, HR is 110 beats per minute, temperature is 101.2°F, and RR is 18 breaths per minute. After giving her a 500 mL bolus of NS, her BP is 115/70 mm Hg. During the examination, you notice that her face and chest appear jaundiced. Her lungs are clear to auscultation and you do not appreciate a murmur on cardiac examination. She winces when you palpate her RUQ. An ultrasound reveals dilation of the common bile duct and stones in the gallbladder. What is the most likely diagnosis?

94. A 62-year-old man with a history of hypertension presents to the ED with severe constant mid-epigastric pain for the past hour. Over the last several months, he has had intermittent pain shortly after eating, but never this severe. He states he now has generalized abdominal pain that began suddenly about 15 minutes ago. He has no history of trauma, has never had surgery, and takes no medications. His vitals include HR of 115 beats per minute lying supine, increasing to 135 when sitting up, BP of 170/105 mm Hg supine, falling to 145/85 mm Hg when sitting up. He appears pale. His abdomen is rigid and diffusely tender with guarding and rebound. Bowel sounds are absent and stool hemoccult is positive. The white blood cell (WBC) count is 8500/μL, hemoglobin 8.5 mg/dL, hematocrit 27%, and platelets 255/μL. Which of the following is the most likely diagnosis?

95. A 60-year-old man with a history of alcohol abuse presents to the ED with hematemesis for 1 day. He denies abdominal or chest pain. On physical examination, his eyes appear reddened which he attributes to having drunken heavily the night before (he also reveals vomiting several times after this recent binge). Vital signs are HR 115 beats per minute, BP 130/85 mm Hg, RR 18 breaths per minute, and temperature 99.5°F. Chest radiograph is unremarkable. Laboratory results reveal a WBC 10,000/μL, haemoglobin 14 mg/dL, hematocrit 40%, and platelets 210/μL. Which diagnosis is endoscopic evaluation most likely to confirm?

96. A 40-year-old man with a recent history of exploratory laparotomy for a stabbing injury presents to the emergency department with diffuse cramping abdominal pain for 1 day, accompanied by nausea, multiple episodes of brown colored vomitus, and lack of stool, but he reports some flatulence. He denies any fever. On physical examination, the patient has stable vital signs, and there is diffuse distention in the abdomen with guarding and tenderness but no rebound, as well as high-pitched bowel sounds. Rectal examination reveals no fecal impaction in the rectal vault, and the stool was guaiac-negative. Complete blood cell count reveals no significant abnormalities and serum chemistry shows a mild metabolic alkalosis. CT demonstrates a noticeable difference in the diameter of proximal and distal small bowel. Which of the following is the most appropriate management?

97. The physician on call is called to the well-baby nursery because a full-term, African-American boy who is 49 hours old has not passed meconium. The pregnancy was uncomplicated. The neonate’s blood pressure is 70/50 mm Hg, heart rate is 140/min, and respiratory rate is 36/ min. The neonate is crying but is easily consolable. His abdomen is markedly distended. A barium enema is ordered, which shows dilated proximal bowel and a narrowed distal segment. Which of the following would provide a definitive diagnosis in this child?

98. A 73-year-old man comes to his primary care physician for his yearly check-up. His medical history is significant for obesity, new onset diabetes mellitus, and a remote history of tobacco use. The patient has noticed that his stool has been darker for the past 3 months, although he has only seen gross blood in his stool once, a week ago. He also complains of recent fatigue and occasional light-headedness when standing up from sitting. On examination the patient has fecal occult blood and a hematocrit of 32%. Colonoscopy and upper gastrointestinal endoscopy reveal no obvious pathology. Which of the following is the best diagnostic test to locate this patient’s hemorrhage?

99. A pregnant 16-year-old girl with no prior pre- natal care presents to the emergency department in labor. A male infant is delivered precipitously. Prenatal laboratory test results are unknown. There is no meconium. He has a birth weight of 3 kg (6 lb 10 oz). He is pink and is crying, heart rate is 130/min, and respiratory rate is 36/min, with good respiratory effort. The emergency medicine resident notices the infant has ascites and a membrane-covered anterior abdominal mass at the base of his umbilical cord. Which of the following is the most likely diagnosis?

100. A 50-year-old man is brought to the ED by ambulance with significant hematemesis. In the ambulance, paramedics placed two large-bore IVs and began infusing normal saline. In the ED, his HR is 127 beats per minute, BP is 79/45 mm Hg, temperature is 97.9°F, RR is 24 breaths per minute, and oxygen saturation is 96%. On physical examination, his abdomen is nontender, but you note spider angiomata, palmar erythema, and gynecomastia. Laboratory results reveal WBC 9000/μL, hematocrit 28%, platelets 40/μL, aspartate transaminase (AST) 675 U/L, alanine transaminase (ALT) 325 U/L, alkaline phosphatase 95 U/L, total bilirubin 14.4 mg/dL, conjugated bilirubin 12.9 mg/dL, sodium 135 mEq/L, potassium 3.5 mEq/L, chloride 110 mEq/L, bicarbonate 26 mEq/L, blood urea nitrogen (BUN) 20 mg/dL, creatinine 1.1 mg/dL, and glucose 150 mg/dL. Which of the following is the most likely diagnosis?