Exam Part 5(1056-1095)nana 2

93) A 34-year-old man is being evaluated for possible end-stage renal disease. He has a long history of diabetes, type 1. He previously developed chronic renal insufficiency despite being on enalapril and insulin. His renal function is getting worse day by day. A nephrologist is currently managing his renal condition. Which of the following long-term treatments would give the best survival rate for this patient?

94) A 50-year-old diabetic woman presents for follow-up of her hypertension. Her blood pressure is 152/96 in the office today and she brings in readings from home that are consistently in the same range over the past month. Her current medications are amlodipine 5 mg daily and hydrochlorothiazide 25 mg daily. The diuretic was added when she developed peripheral edema on the amlodipine; now she has only trace peripheral edema. A spot urine specimen shows 280 µg of albumin per mg creatinine (microalbuminuria is present if this value is between 30 and 300 µg/mg). What would be the best next therapeutic step in this patient?

95) A 64-year-old woman develops severe diarrhea 2 weeks after finishing antibiotics for pneumonia. She has also noticed decreased urine output despite drinking lots of fluids. On examination, she has a postural drop in her blood pressure, the JVP is low, and the abdomen is soft but diffusely tender. Despite giving 4 L of normal saline, her urine output remains low. The urinalysis is positive for hemegranular casts and the urine sodium is 42mEq/L. Which of the following medications should be held during the recovery phase of this woman’s ARF?

96) A 67-year-old man with a history of gout presents with intense pain in his right great toe. He has a complex past medical history, including hypertension, coronary artery disease, congestive heart failure, myelodysplasia, and chronic kidney disease with a baseline creatinine of 3.2 mg/dL and a uric acid level of 10 mg/dL. His medications include aspirin, simvastatin, clopidogrel, furosemide, amlodipine, and metoprolol. What is the best therapy in this situation?

97) A 60-year-old diabetic woman develops angina and will need a coronary angiogram for evaluation of coronary artery disease. She has a creatinine of 2.2. Which of the following is the most effective in reducing the risk of contrast induced nephropathy?

98) A 56-year-old man presents with hypertension and peripheral edema. He is otherwise healthy and takes no medications. Family history reveals that his father and a brother have kidney disease. His father was on hemo-dialysis before his death at age 68 of a stroke. Physical examination reveals BP 174/96 mm Hg and AV nicking on funduscopic examination. He has a soft S4 gallop. Bilateral flank masses measuring 16 cm in length are palpable. Urinalysis shows 15 to 20 RBC/hpf and trace protein but is otherwise normal; his serum creatinine is 2.4 mg/dL. Which is the most likely long-term complication of his condition?

99) A 63-year-old woman has Type II diabetes mellitus, which is well-controlled. Her physical examination is positive for peripheral neuropathy in the feet and nonproliferative retinopathy. A urinalysis is positive for proteinuria. Which of the following treatments is most likely to attenuate the course of renal disease?

100) A 60-year-old man is brought in by ambulance and is unable to speak. The EMS personnel tell you that a neighbor informed them he has had a stroke in the past. There are no family members present. His serum sodium is 118 mEq/L. Which of the following is the most helpful first step in the assessment of this patient’s hyponatremia?

101) A 39-year-old woman is admitted to the gynecology service for hysterectomy for symptomatic uterine fibroids. Postoperatively the patient develops an ileus accompanied by severe nausea and vomiting; ondansetron is piggybacked into an IV of D5 ½ normal saline running at 125 cc/h. On the second postoperative day the patient becomes drowsy and displays a few myoclonic jerks. Stat labs reveal Na 118, K 3.2, Cl 88, HCO3 22, BUN 3, and creatinine 0.9. Urine studies for Na and osmolality are sent to the lab. What is the most appropriate next step?

102) You evaluate a 48-year-old man for chronic renal insufficiency. He has a history of hypertension, osteoarthritis, and gout. He currently has no complaints. His medical regimen includes lisinopril 40 mg daily, hydro-chlorothiazide 25 mg daily, allopurinol 300 mg daily, and acetaminophen for his joint pains. He does not smoke but drinks 8 oz of wine on a daily basis. Examination shows BP 146/86 mm Hg, pulse 76, a soft S4 gallop, and mild peripheral edema. There is no abdominal bruit. His UA reveals 1+ proteinuria and no cellular elements. Serum creatinine is 2.2 mg/dL and his estimated GFR from the MDRD formula is 42 mL/minute. What is the most important element is preventing progression of his renal disease?

103) A 45-year-old woman with cirrhosis secondary to autoimmune hepatitis is seeing her hepatologist for routine follow-up. She reports that she has been feeling relatively well lately, and complains only of mild fatigue. Her medical history is otherwise unremarkable. Her medications include lactulose, spironolactone, propranolol and furosemide. Her vital signs are stable and the remainder of her physical exam is consistent with compensated cirrhosis. Her laboratory values are given below: Sodium 132 mEq/L, Potassium 4.1 mEq/L, Chloride 100 mEq/L, Bicarbonate 24 mEq/L, Glucose 102 mg/dl, Creatinine 0.9 mg/dl, Calcium 7.4 mg/dl, Total protein 6.1 g/dl, Albumin 2.5 g/dl, Total bilirubin 2.1 mg/dl, AST 80 units/L, ALT 102 units/L. What is the most appropriate next step in the management of this patient's hypocalcemia?

104) A 43-year-old female with history of hepatitis C, alcohol use and cirrhosis is admitted to the hospital for severe vomiting for the last 2 days. Her temperature is 36.7°C (98.2°F), pulse is 90/min, respirations are 14/min and blood pressure is 100/70 mmHg supine. Her lungs are clear to auscultation. She has mild epigastric tenderness, but there is no abdominal distention. Extremities have no edema. Her laboratory profile shows: Blood PH 7.49, PaO2 100 mmHg, PaCO2 41 mm Hg, HCO3- 30 mEq/L, Sodium 138 mEq/L, Potassium 3.0 mEq/L, Chloride 95 mEq/L. Which of the following is the most appropriate treatment for the patient's alkalosis?

105) A 21-year-old woman complains of progressive weakness and loss of energy. She nearly collapsed yesterday while performing one of her routine 3 hour workouts. Additionally, she has been performing badly in college despite persistent attempts to improve her grades. Physical exam reveals a blood pressure of 102/58 mmHg, heart rate of 113/min, fine hair covering her face, and normal heart and lungs. Laboratory studies show the following findings: Sodium 140 mEq/L, Potassium 24 mEq/L, Calcium 10.1 mg/dL, Chloride 90 mEq/L, Bicarbonate 40 mEq/L, Urine chloride 14 mEq/L. Which of the following is most likely to correct the laboratory abnormalities in this patient?

108) A 58-year-old man is admitted to the intensive care unit with an exacerbation of his chronic obstructive pulmonary disease (COPD) and respiratory failure. After several hours on noninvasive ventilation the patient develops worsening respiratory distress and requires endotracheal intubation. Which of the following is a contraindication to the use of succinylcholine for rapid-sequence intubation?

109) A 66-year-old white male comes to the physician's office for the first time because of generalized muscle weakness. His review of systems is otherwise negative. He has a past medical history of hypertension, type- 2 diabetes, hyperlipidemia, chronic renal insufficiency and ischemic cardiomyopathy. Neurological examination shows mild weakness of the lower limbs, depressed reflexes and normal sensation. Laboratory studies show: Serum sodium 134 mEq/L, Serum potassium 6.0 mEq/L, Bicarbonate 24 mEq/L, Blood urea nitrogen (BUN) 38 mg/dl, Serum creatinine 2.8 mg/dl, Calcium 8.2 mg/dl, Blood glucose 298 mg/dl. A dose of sodium polystyrene sulfonate is given. Which of the following additional interventions is most important in this patient's management?

110) A 79-year-old female presents to your office with a three-day history of nausea, diarrhea, poor oral intake and weakness. Her past medical history is significant for hypertension treated with enalapril and diltia zem. Her serum chemistry shows the following: Sodium 139 mEq/L, Potassium 7.8 mEq/L, Bicarbonate 14 mEq/L, Chloride 95 mEq/L, Glucose 155 mg/dl, BUN 80 mg/dl, Creatinine 3.1 mg/dl. EKG reveals QRS prolongation and prominent T wave peaking in precordial leads. Which of the following pharmacologic therapies plays a role in treating this patient's electrolyte condition?

111) A 42-year-old male is brought to the emergency department immediately after having a prolonged seizure episode. His family describes a past medical history of grand mal seizures. He has been on phenytoin for the past 10 years, but stopped taking the drug six months ago because he had not had any seizures in the last nine years. He is otherwise healthy and had been doing well until this seizure episode. He does not use tobacco, alcohol or drugs. He is afebrile. His blood pressure is 136/88 mm Hg, respirations are 18/min and pulse is 96/min. He appears confused and lethargic. Chest auscultation is unremarkable, and his abdomen is soft and nontender. A limited neurologic examination is non-focal. His laboratory report shows: Serum sodium 140 mEq/L, Serum potassium 4.0 mEq/L, Chloride 103 mEq/L, Bicarbonate 17 mEq/L, Blood urea nitrogen (BUN) 20 mg/dl, Serum creatinine 0.8 mg/dl, Blood glucose 98 mg/dl. Chest x-ray and urinalysis are within normal limits, and a CT scan of the head is unremarkable. Which of the following is the most appropriate next step in the management of this patient's metabolic acidosis?

113) A 50-year-old male patient comes to the office because he is concerned about the marked tremors of his hands. His tremors disappear with voluntary activity and worsen with emotional stress. He finds it mild difficult to initiate movements. He does not have a family history of tremors. Physical examination reveals tremors that occur at a frequency of 3-4 cycles/sec. There is rigidity of his limb musculature. His gait and posture is minimally disturbed. His higher mental functions are intact. Which of the following is the most appropriate treatment for this patient?

114) A 67-year-old male presents with a six-month history of rigidity, gait problems, tremor and slowness of movements. His condition has progressively worsened over the last few months, and he is now unable to perform his routine daily activities due to the slowness of his movements. He is not taking any medications. On examination, he is alert and conscious. His face is without expression. There is a resting tremor of his hands. He has a stooped posture and shuffling gate. There is rigidity of his limb muscles. Which of the following is the most appropriate initial treatment for this patient?

115) A 58-year-old woman presents to the emergency department with severe headache and agitation. She describes her pain as right-sided and retro-orbital, and also reports blurred vision, constipation, and vomiting. Her medical history is significant for Parkinson's disease, hypothyroidism, hypertension and chronic hepatitis C. Work-up reveals that her current condition is medication-induced. Which of the following agents is most likely responsible?

116) A 67-year-old male comes to the office for a routine physical exam. He retired this year and wants "a clean bill of health." He has no complaints. He stopped smoking 10 years ago, but smoked for 40 years prior to that. He only takes a "water pill" for hypertension. His vital signs are normal. The physical examination reveals a bruit in his neck. His chest x-ray, EKG, and blood work have normal results. Duplex ultrasonography of his neck reveals a 70% irregular lesion at the right common carotid artery bifurcation. The left common carotid artery has a 40% lesion. What is the best next step in the management of this patient?

117) A middle-aged woman is found wandering the streets with an abnormal gait. Police officers bring her to the hospital. She mumbles when asked for her name and age. She is not oriented to time or place. Her blood pressure is 160/100 mmHg and her heart rate is 100/min. She is afebrile. Mucous membranes are moist and the pupils are dilated and reactive to light. She moves all of her extremities, and her deep tendon reflexes are symmetric. Which of the following is the best initial treatment for this patient?

119) A 7-year-old boy is brought to the office by his mother because, "he is always daydreaming." Sometimes, he stares for a few seconds and rolls his eyes for unknown reasons. His teacher has noted a recent decline in his school performance. He has no family history of any seizure disorder, and his psychomotor development is normal. His neurological examination is unremarkable. EEG during hyperventilation shows generalized, symmetrical 3-Hz spike-and-wave activity on a normal background. Which of the following medications is the most appropriate to treat the boy's disorder?

120) A 32-year-old Caucasian male comes to the emergency department due to progressive ascending paralysis, which began 18 hours ago. He initially noticed paresthesias in his lower limbs, followed by a sense of fatigue and weakness. He denies any history of headache, fever, and recent infection or illness. His blood pressure is 120/80 mm Hg, pulse is 80/min, respirations are 16/min, and temperature is 37.3°C (99.2°F). The physical examination reveals intact cranial nerves, absent deep tendon reflexes, and a normal sensory exam. Laboratory studies reveal a normal WBC count. No abnormalities are noted on CSF examination. While evaluating the patient in the hospital, he quickly deteriorates. What is the most appropriate next step in the management of this patient? .

121) A 36-year-old Caucasian male is brought to the emergency department due to weakness of his upper and lower extremities. Neurological examination reveals weakness, atrophy, fasciculations, spasticity and hyperreflexia of the involved muscles. His sensory, bowel, bladder and cognitive functions are intact. Serum creatine kinase is normal. Cerebrospinal fluid examination is within normal limits. Electromyography shows chronic partial denervation. The patient is subsequently diagnosed with amyotrophic lateral sclerosis. Which of the following has been approved for use in patients with amyotrophic lateral sclerosis?

123) A 62-year-old Caucasian man with hypertension and chronic kidney disease complains of poor sleep. He describes a sensation of spiders crawling over both legs about 15-20 minutes after going to bed. Sometimes he has to sit up in bed and massage his legs. His wife's sleep has deteriorated as her husband's leg movements have gotten worse. Pharmacotherapy for this patient's disease is typically directed at which of the following?

124) A 22-year-old white obese female presents with headache for the last few weeks. Headache is worse at night and wakes her from sleep. Headache is pulsating in quality and is also associated with nausea and vomiting. She denies any weakness, sensory abnormalities or visual problems. She denies any history of trauma. She does not take any medication. Neurological examination is unremarkable. Fundoscopy shows papilledema. CT scan of head does not show any abnormality. Lumbar puncture is performed and CSF examination is normal except increased CSF pressure. Weight loss fails to control her symptoms. Which of the following is the most appropriate next step in the management of this patient?

125) A 52-year-old Caucasian male comes to the office for the evaluation of tremors. He has been having tremors in both hands and head over the past several months. He does not experience any tremors at rest, or any problem with his legs. He has a history of alcohol abuse. He is currently not on any medication. His father had essential tremors, and his paternal uncle has Parkinsonism. The physical examination reveals tremors, which increase in amplitude when he tries to reach for an object. Which of the following is the most appropriate next step in the management of this patient?

126) A 32-year-old Caucasian male is admitted to the hospital due to a 1-week history of progressive paralysis of his upper and lower extremities. He had a flu-like illness 3 weeks ago, followed by paresthesias in his fingertips and toes. The weakness initially started in his lower extremities. He denies any changes in bowel and bladder functions. His blood pressure (supine) is 130/70mm Hg, heart rate is 82/min, respirations are 18/min, and temperature is 36.9°C (98.5°F). Physical examination reveals bilateral facial paralysis, orthostatic hypotension, areflexia in all four extremities, and distal paresthesias. His CSF analysis shows: Total WBC 10/cmm, Protein 120 mg/dl, Glucose 70 mg/dl, Gram stains No organisms. What is the most appropriate next step in the management of this patient?

127) A 59-year-old white male comes to the office for the evaluation of a brief episode of right arm and leg weakness. The episode lasted for a few minutes, and was followed by a complete recovery. He had a similar episode one month ago. He has a 30 pack-year history of cigarette smoking. He has hypercholesterolemia, which is being treated with diet and exercise. His pulse is 76/min, regular, and blood pressure is 130/80 mmHg. His laboratory test results are: Hb 14.2 g/dl, WBC 7,000/cmm, Platelets 230,000/cmm, Blood Glucose 118 mg/dl, Serum Na 138 mEq/L, Serum K 4.5 mEq/L, BUN 16 mg/dl, Serum Creatinine 1.0 mg/dl. EKG shows normal sinus rhythm. CT scan of the head is unremarkable. MRI angiography of the head and neck fails to show any abnormality. Transesophageal echocardiography (TEE) is unremarkable. Which of the following is the most appropriate next step in management?

128) A 65-year-old lady comes to the office for the evaluation of her deteriorating memory. She has become increasingly forgetful over the last several months, and now appears very concerned about her memory loss. She used to pride herself for her sharp memory, but has been forgetting the most trivial things and has become "extremely inefficient." She also complains of easy fatigability, poor appetite, and frequent awakening at night. She feels worthless and has lost interest in her favorite hobby, which is gardening. On coughing or laughing, she loses urine involuntarily, and this is adding to her misery. She lives with her husband, who says that she has become very "cranky and irritable" lately. Her medical history is significant for hypercholesterolemia, for which she refuses to take medication. She is presently not on any hormonal therapy. The physical examination is completely normal. Laboratory studies are unremarkable. CT scan of the head is normal. What is the best next step in the management of this patient?

129) A 27-year-old Caucasian female with multiple sclerosis (MS) comes to the office for a follow-up visit. Six months ago, she experienced monocular vision impairment and clumsiness of the right hand, and both symptoms resolved completely. Three weeks ago, she experienced incoordination, weakness and spasticity in the right extremities. She was admitted in the hospital for treatment of an acute MS flare, and rapidly improved thereafter. Physical examination currently demonstrates slight weakness of the right leg with a hyperactive knee jerk. Which of the following medications may slow the long-term progression of this patient's disease?

130) A 45-year-old man is brought to the emergency department following a serious motor vehicle collision. Despite heroic attempts to save him, the physician caring for him believes he is brain dead. Unfortunately, the patient does not have an advanced directive or durable medical power of attorney. What step is necessary in order to remove the patient from the ventilator?

131) A 32-year-old female is crying as she approaches the office. She has had severe, unbearable pain in her face for the past five days. She describes the pain as knife-like, comes in paroxysms, occurs 10-20 times a day, and lasts a few seconds. She does not know what precipitates the attacks, but she has been unable to sleep, eat or go to work because of her symptoms. She has tried numerous pain medications, but nothing seems to relieve the pain. She denies any history of trauma, medication use or recent surgery. Vital signs are within normal limits. Physical examination is within normal limits. Which of the following agents will best benefit this patient?

132) A 23-year-old white female presents with an acute onset of headache for the last eight hours. Her headache is severe, unilateral, pulsating in quality, associated with photophobia, worsens with physical activity, and does not respond to acetaminophen or ibuprofen. This is her 6th episode of similar headache over the last 2 months, and it is her first time to seek medical attention. Her neurological examination is unremarkable. Which of the following is the most appropriate next step in the management of this patient?

133) A 54-year-old male presents to the office with several months history of hand tremors that are unresponsive to over-the-counter medication. The tremors always become worse when he is in public places. Sometimes, the hand tremors are so bad that he is unable to grasp. He denies trauma, fever, loss of muscle function or any prior stroke. His past medical history is significant for vague abdominal pains, the cause of which was never found. He is given some medication. A month later, he comes back and says, "The tremor is gone, but now I have colicky abdominal pain, confusion, headaches, hallucinations and dizziness." What is the drug that caused this patient's new symptoms?

134) A 44-year-old male has been abusing drugs for many years. Recently he started using the agent MPTP and he now presents to you in the ER. He says that he is not feeling well and wonders what is going on. He says he has a persistent tremor in his fingers and his body has become rigid. At times has had difficulty in walking. The CT scan of his brain is normal and all the blood work is within normal limits. You decide to treat him. Two years later you see him and he tells you that his symptoms have improved. He also noticed that he had a significant relief from the recurrent and persistent upper respiratory tract viral infections that he was so prone to. The agent you gave him was?

135) A 5-year-old boy is brought to the office by his frustrated mother because, "he just can't seem to concentrate!" He has episodes that are characterized by frequent blinking and indifference to his surroundings. He does not remember anything after an episode. An episode does not last long, but he usually has 50-80 "daydreaming accidents" daily. His school performance has deteriorated lately, and his teacher has complained about his decreased concentration. Which of the following is the drug of choice for this patient's condition?

136) A 27-year-old white female comes to the office and complains of ptosis, diplopia and difficulty in chewing. Her symptoms worsen in the evening. She is asymptomatic when she wakes up in the morning. She denies any sensory complaints or limb weakness. The Tensilon test is positive. Serological testing shows positive acetylcholine receptor antibodies. Which of the following is the best treatment to induce remission and provide long-term benefits in this patient?

137) A 62-year-old male is brought to the emergency department with a chief complaint of weakness. He says that he was walking his dog 1 hour ago when he began to limp and noticed some weakness in his left arm. His past medical history is significant for hypertension treated with hydrochlorothiazide, and type II diabetes mellitus managed with metformin. He denies nausea, vomiting, chest pain, fever or chills. He does note occasional palpitations and tension headaches at baseline. On physical examination, his blood pressure is 170/95 mmHg and his heart rate is 76/min and regular. His blood glucose level is 190 mg/dl and his HbA1c is 7.6%. The neurological examination is significant for profound left-sided weakness and an up going Babinski reflex on the left. Non-contrast head CT is negative for any intracranial bleed. Which of the following is most likely to affect his chance of neurological recovery?

138) A 62-year-old female is brought in by EMS due to a severe right-sided headache, nausea and eye pain. She was fixing a light bulb, when she suddenly felt pain in her right eye. She decided to rest, but the eye pain only got worse. In the next few minutes, she developed loss of vision, photophobia and redness in the same eye. She took medications to relieve the accompanying headache, but the eye pain persisted. She denies any trauma. Her past medical history is significant for diabetes and hypertension. She appears to be in intense pain with bouts of nausea. Her right eye is red, with conjunctival flushing and visual acuity of 20/200. Her right pupil is mid-dilated and non-reactive to light. The same eye feels hard on palpation. The one treatment that should be avoided in this patient is:

139) A 65-year-old male comes to the emergency department because of a sudden, painless loss of vision in his right eye that occured a half an hour ago. Five hours ago, he experienced a similar but transient loss of vision in the same eye, which lasted for five minutes. He has hypertension, diabetes, hypercholesterolemia, and peripheral vascular disease. He had an anterior wall myocardial infarction six years ago. His medications include glyburide, captopril, atenolol, simvastatin and aspirin. His temperature is 36.7°C (98.0°F), respirations are 16/min, pulse is 88/min, and blood pressure is 146/88 mmHg. Examination of the right eye reveals visual acuity of 20/60 and subtle retinal whitening. A right carotid bruit is heard. Which of the following is the most appropriate next step in the management of this patient?

140) A 33-year-old man presents with a 1-day history of localized, small swelling along the margin of the upper eyelid. He feels pain, which does not seem to come from the conjunctival surface. He has a 10pack year smoking history. He occasionally drinks alcohol. He is sexually active, and does not use condoms regularly. He is worried about the swelling. What is the best next step in the management of this patient?

141) A 72-year-old man presents with right eye pain for 1 day. The patient has a history of diabetes, hypertension, and “some type of eye problem.” He does not recall the name of his eye problem or the name of his ophthalmic medication. However, he does remember that the eye drop has a yellow cap. Which class of ophthalmic medication is the patient taking?

142) A 45-year-old woman presents with right eye pain and redness for 1 day. She has photophobia and watery discharge from the eye. She does not wear glasses or contact lenses and has no prior eye problems. On examination, the patient’s visual acuity is 20/20 in the left eye and 20/70 in the right eye. She has conjunctival injection around the cornea and clear watery discharge. On slit-lamp examination, the lids, lashes, and anterior chamber are normal. When fluorescein is applied, a branching, whitecolored epithelial defect is seen. The remainder of the head examination is normal and the patient has no cutaneous lesions. Which of the following is the most appropriate treatment for this patient?

144) A 28-year-old mechanic with no past medical history presents to the ED after a small amount of battery acid was splashed in his right eye. He is complaining of extreme pain and tearing from his eye. Which of the following is the most appropriate next step in management?

145) A 33-year-old white female complains of repeated episodes of fever, malaise, chills, breathlessness and dry cough over the past 6 months. She says that each episode starts suddenly and lasts for several days. She otherwise has no significant past medical history and does not take any medications. There is no family history of lung disorders. She does not smoke cigarettes or drink alcohol. She has never been abroad, and has had no sick contacts. She breeds budgerigars (a small Australian parrot) as a hobby. Chest x-ray shows diffuse generalized haziness in both lower lung fields. Pulmonary function tests reveal reduced lung volumes and an FEV1/FVC ratio of 87%. PPD test is negative. Serology shows antibodies to budgerigar antigens. What is the best treatment for this disease?

146) A 44-year-old male is involved in a serious motor vehicle accident. He is admitted to the intensive care unit with multiple fractures and internal bleeding, and is placed on mechanical ventilation. Over the next two days, his oxygen saturation repeatedly drops below 90%, requiring gradual increases in the FiO2. On day three of his admission, the patient's chest x-ray, which was initially clear, shows bilateral fluffy infiltrates. He has no prior medical problems and does not take any medications. Skin examination reveals no rashes. Lab studies show: Hemoglobin 10.1 g/L, Platelets 160,000/mm3, Leukocyte count 13,500/mm3. Sputum cultures are negative. The ventilator settings are: FiO2 90%, Tidal volume 400 ml (body weight 60 kg), Respiratory rate 12/min, PEEP 5cmH2O. The patient's oxygenation continues to drop below 90%. Which of the following interventions would be best for improving the patient's oxygenation?

147) A 65-year-old white man comes to the Emergency Room complaining of headache, insomnia, palpitations, and vomiting. His past medical history is significant for chronic obstructive pulmonary disease (COPD) treated with theophylline, ipratropium, and occasional albuterol. He had a puncture wound of the foot one week ago, and it is being treated effectively with amoxicillin-clavulanate and ciprofloxacin. For the past three days, his shortness of breath is worsening, and his primary care physician gave oral prednisone. His blood pressure is 150/80 mmHg and heart rate is 105/min with frequent ectopic beats. You suspect that drug toxicity may be responsible for this patient's complaints. Which of the following drugs is most likely responsible for his condition?

148) A 67-year-old woman with a past medical history significant for hypertension, hypercholesterolemia, and type 2 diabetes calls 911 for severe shortness of breath. Her symptoms started 2 hours ago with chest pain and progressed rapidly to orthopnea and shortness of breath. Her blood pressure is 170/ 100 mmHg and heart rate is 120/min and regular. A third heart sound is present. Bilateral crackles are heard on chest auscultation. Her oxygen saturation is 78% with 40% inspired oxygen. She is intubated in the field by paramedics for progressive respiratory failure and is treated with nitrates and diuretics. After the initial resuscitation, breath sounds on the left side are markedly decreased. Which of the following is most likely to restore breath sounds to this hemithorax?

149) A 55-year-old chronic smoker comes to you because of worsening shortness of breath. He says that he has had lung problems due to smoking for the past five years. He has hypertension controlled with hydrochlorothiazide, and type 2 diabetes mellitus, controlled with diet. He has smoked two packs of cigarettes daily for 25 years. Physical examination shows bilateral decrease in breath sounds with prolonged expiration and wheezing in both the lung fields. He is hypoxic on room air. An x-ray film of the chest shows hyperinflation of both lung fields. His pulmonary function tests showed moderate obstructive disease, with very little bronchodilator response. The patient is started on bronchodilators. He is being considered for home oxygen therapy. Which of the following is a criterion for initiating home oxygen in such patients?

151) A 76-year-old male nursing home resident is hospitalized with confusion, fever and decreased oral intake. His past medical history is significant for type 2 diabetes mellitus, hypertension, osteoarthritis and gout. Blood cultures are positive for E coli. Despite antibiotic therapy, he slips into respiratory failure. He is intubated and placed on mechanical ventilation with an FiO2 of 70%, tidal volume of 500 ml and respiratory rate of 14/min. His current arterial blood gases are: pH 7.45, pO2 59 mmHg, pCO2 30 mmHg, HCO3 21 mEq/L. Which of the following is the best next step in managing this patient?

152) A 45-year-old male with mild persistent asthma comes to you for a routine checkup. He is taking a low-dose beclomethasone inhaler daily and inhaled albuterol, as needed, for the last year. His past medical history is otherwise not significant. His family history is significant for diabetes mellitus type 2, hypertension and obesity. His blood pressure is 136/90 mmHg and his heart rate is 80/min. His BMI is 26 kg/m2. Which of the following is the most likely complication of chronic beclomethasone use in this patient?

153) A 56-year-old morbidly obese man twisted his ankle five days ago and has been bed-ridden since. Today he presents to the emergency department with acute-onset shortness of breath and chest tightness. His past medical history is significant for diabetes mellitus, hypertension, right knee osteoarthritis, and a deep venous thrombosis. His current medications are lisinopril, metoprolol, and metformin. His blood pressure is 110/60 mmHg and his heart rate is 110/min. A CT scan of the chest with contrast is consistent with pulmonary thromboembolism. Which of the following is the best treatment for this patient?

154) A 35-year old male presents to your office complaining of nocturnal wheezing and chest tightness for the past three months. He has also noticed new hoarseness, particularly in the morning. He has no history of bronchial asthma, hypertension or diabetes. He is a non-smoker but occasionally drinks alcohol. On examination, he is an obese male in no acute distress. His pulse is 84/min, blood pressure is 130/80 mmHg, and respirations are 16/min. His chest is clear to auscultation and percussion. Laryngoscopy reveals a red and inflamed posterior pharynx and larynx. Which of the following pharmacotherapies would be most helpful for this patient?

155) A 38-year-old female comes to your office with a recent episode of hemoptysis. The symptoms started one week ago with malaise, throat pain and dry cough. The cough progressed becoming productive of yellowish sputum. She started noticing speckles of red blood in her sputum as of yesterday. Her past medical history is significant for peptic ulcer disease. She has a 5 pack-year smoking history, but she quit 10 years ago. Her temperature is 98°F (36.7°C), blood pressure is 130/80 mmHg and heart rate is 87/min. Physical examination reveals scattered bilateral wheezes. Chest X-ray shows clear lung fields. Which of the following is the most appropriate next step in management?

156) A 34-year-old male presents to his physician's office for a routine health maintenance examination. He has a five-year history of bronchial asthma for which he uses an albuterol inhaler. He says that he uses the inhaler an average of two times per week during the day. In addition, he states that his asthma symptoms wake him from sleep approximately 3-4 times per month. He does not use tobacco, alcohol or illicit drugs. His family history is significant for asthma in his grandfather. Physical examination is unremarkable. Which of the following is the most appropriate next step in his management?

157) A 19-year woman presents to her physician's office for a routine health maintenance examination. She notes experiencing occasional wheezing and breathlessness following aerobic exercise, but has no symptoms at other times of the day or night. Her medical history is otherwise significant for allergic rhinitis and acne, for which she uses topical benzoyl peroxide and erythromycin cream. She does not use tobacco, alcohol or illicit drugs. On physical examination, her vital signs are within normal limits and chest auscultation is unremarkable. Which of the following is the most appropriate next step in her management?

158) A 57-year-old male was involved in a motor vehicle accident and was immediately brought to the Emergency Room. He suffered minor head and neck injury, but was found to have a broken tibia. He underwent repair of the tibial fracture the following day. Five days later, he suddenly develops tachycardia and is tachypneic. He complains of increasing chest discomfort and has a syncopal episode. His blood pressure is 80/55 mmHg, pulse is 130/min, and respirations are 24/min. Pulse oximetry showed 82% on room air. Stat echocardiogram reveals obstruction in the main pulmonary artery. Which of the following choices is the most appropriate course of action?

159) A 68-year-old female comes to the Emergency Room with increased shortness of breath and cough for 12 hours. She has a history of chronic obstructive pulmonary disease for the past 14 years and has been oxygen dependent for two years. Twelve hours ago, she felt unable to get her breath. She took two extra nebulizer treatments and used her as-needed inhaler with no relief of symptoms. She denies any fever, chills, sweating, nausea or vomiting, and hemoptysis. She rarely uses alcohol, but had smoked two packs/day for 45 years. She quit smoking about six years ago. Her medications include ipratropium, albuterol, multivitamins, and oxygen 2 liters/min by nasal cannula. She is a thin, frail female in moderate distress. Her temperature is 36.7°C (98°F), blood pressure is 110/65 mmHg, pulse is 110/min, and respirations are 28/min. Pulse oximetry shows 84% on 2 liters oxygen by nasal cannula. The patient is given oxygen, methyl prednisolone, aerosolized ipratropium, and albuterol; however, the patient remains dyspneic and bedridden. ABGs are ordered and the results show: pH 7.32, PCO2 60 mmHg, and PO2 52 mmHg on 4-liters O2. What is the next best step in the management of this patient?

160) A 68-year-old male is hospitalized following an intracerebral hemorrhage. On hospital day 3, he develops redness, swelling, and tenderness of the left calf. There is no fever. Compression ultrasonography reveals a thrombus in the popliteal vein. Which of the following is the most appropriate next step in the management of this patient?

161) A 66-year-old man complains of exertional dyspnea that has progressed over the last two years. As a result, he has had to limit his physical activities to avoid becoming short of breath. He denies any significant chest pain, but does note having a recurrent cough productive of whitish sputum. His past medical history is significant for hypertension controlled with hydrochlorothiazide. He has a 40 packyear smoking history. His family history is significant for a stroke in his mother. His blood pressure is 160/90 mmHg and his heart rate is 80/min. Physical examination reveals a mildly overweight patient in no acute distress. His anteroposterior chest diameter is markedly increased. Breath sounds are decreased bilaterally with scattered expiratory wheezes. Which of the following agents is most likely to reduce this patient's symptoms?

162) A 64-year-old male presents to the physician's office with increasing shortness of breath. He denies orthopnoea, paroxysmal nocturnal dyspnea, or chest pain. He was hospitalized for pneumonia four years ago but has otherwise been healthy. He has smoked one pack of cigarettes daily for the past 30 years. He does not take any medications. His temperature is 37.2°C (98.9°F), blood pressure is 124/76 mm Hg, pulse is 82/min and respirations are 16/min. Pulse oximetry reveals an oxygen saturation of 88%. On chest auscultation, breath sounds are diminished throughout, and the expiratory phase is prolonged. Heart sounds are regular and there are no murmurs or gallops. There is no peripheral edema or jugular venous distention. Laboratory studies show a hematocrit of 56% and WBC count of 6,700/mm3. Which of the following interventions will have the maximum impact on this patient's survival?

163) A 47-year-old male who has just returned from a cruise to the Bahamas presents to the hospital with a high-grade fever, productive cough and shortness of breath for the past two days. He also complains of frequent vomiting and diarrhea. He has no prior medical problems, does not take any medications, and denies using tobacco, alcohol or drugs. His temperature is 40°C (104°F), blood pressure is 110/65 mm Hg, pulse is 80/min, and respirations are 18/min. Lung examination reveals right lower lobe crackles. The abdomen is soft and non-tender. Chest x-ray demonstrates right lower lobe consolidation. Sputum Gram stain contains many neutrophils with no organisms. Which of the following antibiotics must be given to this patient?

164) A 36-year-old female presented to the emergency room with fever and a productive cough. The physician on call suspected community acquired pneumonia and prescribed azithromycin for 5 days. After 5 days of treatment, she comes to your office with no improvement of her symptoms and complains of worsening foul smelling sputum. Further inquiry reveals that she had undergone an upper GI endoscopy 8 days ago for a long history of heartburn and suspected peptic ulcer disease. She also reports a history of manic-type bipolar disorder. In your office she has a blood pressure of 130/80 mm Hg, her pulse is 108/min, temperature is 38.7°C (101.6°F) and respirations are 26/min. Chest x-ray showed a right upper lobe infiltrate. Which of the following additional therapies would be most helpful for this patient's condition?

165) A 45-year-old male comes to the emergency room complaining of shortness of breath that began 3 hours ago. He also has a nonproductive cough, a low-grade fever and right-sided chest pain that worsen with inspiration. He denies coughing up blood, wheezing, palpitations, leg pain or swelling of his lower extremities. He recently returned home from a trip to Singapore. He has a history of hypertension and diabetes mellitus. His takes fosinopril, metformin and glyburide. He doesn't use tobacco, alcohol or illicit drugs. His temperature is 98.0°F (36.6°C), blood pressure is 115/70 mmHg, pulse is 128/min, respirations are 32/min, and O2 saturation is 84% on room air. Physical examination shows a slightly obese man in acute respiratory distress. He is alert and cooperative without any cyanosis or jaundice. He has a slightly displaced apical impulse with a S4. Chest-x ray shows mild cardiomegaly with no infiltrates. EKG shows sinus tachycardia and left ventricular hypertrophy without ST-T wave changes. His arterial blood gas analysis shows pH 7.52, pCO2 30, pO2 55, HC03 22. What is the next best step in the management of this patient?

166) A 65-year-old male with oxygen-dependent chronic obstructive pulmonary disease, chronic atrial fibrillation, and depression comes into the Emergency Room, with symptoms of increased dyspnea and worsening cough pattern. His recent history had been significant for a gradual worsening of his baseline lung disease over the past month, which had been treated by his outpatient doctor with increased frequency of inhaled beta-agonist and azithromycin. This morning he had a severe shortness of breath that was unresponsive to "stacked" home nebulizer treatments. The ER physician notes that the patient is in moderate severe respiratory distress. His temperature is 37.2°C (99°F), blood pressure is 150/90 mmHg, pulse is 110/min, and respirations are 28/min. Accessory muscle use was noted. Lung exam shows diffuse rhonchi and wheezing. A pulse oximetry revealed an oxygen saturation of 80% on room air. His chest x-ray showed no new infiltrates. His WBC count is 7,000/cmm with normal differential. The ER physician had given nebulization, and the patient is on 5-liters of oxygen. Which of the following should also be considered in this patient?

167) A 32-year-old man presents to the emergency department with pain and swelling in the right leg. He was recently hospitalized for a right lower extremity deep venous thrombosis and discharged on warfarin. Today his INR is 1.12. Ultrasound reveals a right popliteal vein thrombosis extending into the deep femoral vein. What is the best initial management step for this patient?

168) A 50-year-old female comes into your office complaining of four-month history of dry cough. She denies dyspnea or hemoptysis. Past medical history is significant for hypertension, diabetes, and gout. Her current medications include enalapril, metformin, hydrochlorothia zide, and allopurinol. She does not smoke or consume alcohol. Her vital signs are BP 130/80 mmHg, HR 80/min, T 36.7°C (98°F) and RR 16/min. Physical examination is within normal limits. The best next step in the management of this patient is:

169) A 45-year-old white man presents to your office complaining of daytime somnolence, increased fatigability, and morning headaches. He says that his wife complains that he snores loudly. He is not taking any medications and does not smoke or consume alcohol. His blood pressure is 145/90 mmHg and heart rate is 90/min. Physical examination reveals a well-nourished man with BMI = 31 kg/m2. What is the next best step in the management of this patient?

170) A 43-year-old previously healthy male is hospitalized for acute pancreatitis. On day 3 of his admission, he develops respiratory distress. He is transferred to the intensive care unit and intubated. His initial ventilator settings are: FiO2 0.8 (80%), Respiratory rate 10/min, Tidal volume 500 ml, PEEP 5 mm H20. Ten minutes after being intubated, the man's blood pressure is 110/70 mmHg and his heart rate is 90/min. His arterial blood gases are: pH 7.42, pO2 105 mmHg, pCO2 37 mmHg. Which of the following is the best next step in the management of this patient?

171) A 35-year-old male was involved in a motor vehicle injury and suffered serious chest trauma. A chest tube was placed for a hemothorax. 800 cc of blood was evacuated from the chest, and, after ten days, the patient was discharged home. He returns again with a low-grade fever and dyspnea. CT scan reveals a complex loculated effusion with a thick surrounding peel. A chest tube is placed; however, after 24 hours, there is little drainage, and the patient continues to have a low-grade fever. What is the next step in his management?

172) A 40-year-old white male develops a proximal deep vein thrombosis in the left lower extremity. Detailed history, examination and lab testing fail to reveal any obvious cause or risk factor for his deep venous thrombosis. Idiopathic deep vein thrombosis is diagnosed and the patient starts a 6-month course of warfarin anticoagulation. What is the goal INR therapeutic range in this patient?

173) An obese 56-year-old female presents to her physician concerned that her asthma is worsening. She describes night-time cough and wheezing that have been increasing over recent months. She also reports feeling tired each morning because she works late hours and has no time to relax after dinner. On review of systems, the patient denies dyspnea on exertion, but acknowledges that her throat has been sore lately. Her past medical history is significant for bronchial asthma, type2 diabetes and hypertension. Her medications include an albuterol inhaler which she uses occasionally, lisinopril and aspirin. Her vital signs are within normal limits, and there are no abnormalities on physical exam. Which of the following is the most appropriate next step in the management of this patient?

175) A 46-year-old male is hospitalized with severe acute pancreatitis. Because of progressive respiratory difficulty, he is intubated and placed on mechanical ventilation. His weight is 70 kg (152 lb), blood pressure is 110/70 mmHg, and heart rate is 90/min. Chest x-ray shows patchy opacities bilaterally, consistent with pulmonary edema. His current ventilator settings are: assist control mode, respiratory rate of 12/min, tidal volume of 450 ml, FiO2 of 40%, and positive end-expiratory pressure (PEEP) of 5 cm H20. His blood gas readings are: pH 7.51, pCO2 22mmHg, pO2 121mmHg. Which of the following is the best next step in managing this patient?

176) A 69-year-old male presents to the ER with severe shortness of breath for the past 12 hours. He reports that he has used his albuterol inhaler many times without relief. On review of systems he notes having had a mild fever yesterday that resolved with acetaminophen. The patient quit smoking 2 years ago but has a 100 pack year smoking history. On physical examination, his blood pressure is 150/90 mmHg and heart rate is 110/min. The patient is using accessory muscles of respiration. Expirations are prolonged, and there are wheezes bilaterally. Arterial blood gas (ABG) analysis reveals the following: pH 7.36, pO2 64 mmHg, pCO2 57 mmHg, HCO3 32 mEq/L. The patient is treated with ipratropium and albuterol nebulizers and moxifloxacin. Which of the following additional therapies is most likely to benefit this patient?

177) A 28-year-old male presents to the physician's office for a routine health maintenance examination. He has a two-year history of bronchial asthma for which he uses an albuterol inhaler. He states that he experiences asthma symptoms an average of 2 times per week, for which his albuterol inhaler provides relief. He has not had nighttime awakenings over the past month. He does not use tobacco, alcohol or illicit drugs. His family history is significant for asthma in his grandfather. Physical examination is unremarkable. Which of the following is the most appropriate next step in his management?

179) A 35-year-old homeless man presents to the emergency department with chief complaints of a cough and fever. He is intoxicated. He admits to drinking about a fifth of vodka every day and confirms a history of delirium tremens and blackouts. X-ray of the chest is significant for an air-fluid level in the superior segment of the right lower lobe. Which of the following is the most appropriate first-line agent for treating this patient’s condition?

180) An agitated and nervous 24-year-old woman has had severe wheezing and shortness of breath for 2 days. After receiving oxygen, steroids, and salbutamol (Ventolin) in the emergency room, her breathing improves. She is still wheezing and now feels tremulous and anxious with a pulse of 110/min and respirations 30/min. Arterial blood gases on oxygen reveal a pH of 7.40, PO2 340 mm Hg, PCO2 40 mm Hg, and bicarbonate of 24 mEq/L. She is hospitalized for further treatment. Which of the following treatments or medications should be avoided in her?

181) A 29-year-old woman has a long history of mild asthma. She now has a flare and experiences recurrent episodes of bronchial obstruction, fever, malaise, and expectoration of brownish mucous plug. On examination, there is bilateral wheezing. Infection is suspected and a CXR reveals upper lobe pulmonary infiltrates. The eosinophil count is 2000/mL, and serum precipitating antibodies to Aspergillus are positive. Which of the following is the most appropriate next step in management?

182) A 31-year-old African American man presents with dyspnea on exertion. He also has fever and red tender rash on his shins. Physical examination reveals fine inspiratory crackles in both lower lung lobes and tender erythematous nodules on his legs. CXR shows bilateral hilar adenopathy and reticulonodular changes in both lungs. Transbronchial biopsy reveals noncaseating granulomas. Which of the following is the most appropriate next step in management?

183) A 53-year-old man with a long respiratory his- tory is admitted to the hospital because of increasing shortness of breath and sputum production. He is started on antibiotics and inhaled bronchodilators and anticholinergic agents. The next day he is found in his room confused and sleepy. A PCO2 determination reveals severe hypercarbia (PCO2 70 mmHg). Which of the following explanations regarding his elevated PCO2 is correct?

184) A 30-year-old man presents to the resuscitation bay with gunshot wounds in the anterior and posterior left chest. Although in distress and dyspneic, the patient is cooperative. He has a patent airway and is moving all extremities. His pulse is 120/min, blood pressure is 120/90 mm Hg, and respiratory rate is 30/min. He has bounding distal pulses, and no other injuries are identified on secondary examination. X-ray of the chest reveals fluid in the pleural space, and a left chest tube thoracostomy yields 600 mL of bright red fluid. Over the next hour 750 mL of blood is collected. What is the most appropriate next step in management?

185) A 22-year-old woman with mild persistent asthma comes to the primary care clinic after an emergency department visit 2 days ago for an acute asthma exacerbation. She notes an in- crease in frequency of wheezing and shortness of breath for the past 4 months, with daily symptoms, and has been symptomatic for at least 2 nights per week. She has also had three emergency department visits during the same period. Her current asthma medications include montelukast (leukotriene inhibitor) daily and an albuterol inhaler as needed. The patient’s peak flow is 75% of predicted. Which of the following is the most appropriate next step in management?

186) A 30-year-old man has episodes of wheezing and shortness of breath two to three times per week. Approximately every 2 weeks he awakens at night due to cough and difficulties breathing. He reports having similar symptoms since he was a child, but believes that they are worsening somewhat now. His symptoms are worsened by cold air and exercise and are improved by rest. Which of the following is the most appropriate treatment?

187) A 63-year-old woman presents with dyspnea and coughing up foul smelling purulent sputum. She has had many similar episodes in the past. There are no other constitutional symptoms and she denies excessive alcohol intake. On physical examination, she appears chronically ill with clubbing of the fingers. Heart sounds are normal, JVP is measured at 4 cm, and there are inspiratory crackles heard at the lung bases posteriorly. There is no hepatosplenomegaly or any palpable lymph nodes. CXR shows scaring in the left lower lobe, which on chest CT scan is identified as cystic changes with airway dilatation and bronchial wall thickening. Which of the following is the most appropriate initial next step in management?

188) A 65-year-old smoker previously diagnosed with chronic obstructive pulmonary disease presents to the emergency department complaining of worsening cough and sputum production. She reports feeling breathless when climbing the stairs to her first floor walk-up apartment, and has moderate difficulty in providing her history in complete sentences. X-ray of the chest shows hyper inflated lungs with flattened diaphragms, attenuated vascular markings, and a narrow mediastinum. What agent(s) will provide the greatest relief of symptoms in the emergency department?

189) A 51-year-old man presenting to the clinic for routine examination mentions that he has not been able to get over the flu. Further questioning clarifies that he has had a nonproductive cough for the past 3–4 months and is unable to sustain his normal walking pace for prolonged periods. He reports feeling more fatigued than he recalls feeling last year. His medical history is significant for hypertension, alcoholism, and obesity. His blood pressure is well controlled on losartan and hydrochlorothiazide. He has no known drug allergies. His mother died of complications of type 2 diabetes mellitus. His father had a fatal myocardial infarction at age 56 years. The patient smokes half a pack of cigarettes per day and has done so for the past 7 years. He has worked all his adult life as an accountant and has no known exposures to asbestos or organic dusts. His blood pressure is 134/96 mm Hg, heart rate is 78/min, respiratory rate is 16/min, temperature is 37°C (98.6°F), and oxygen saturation is 94% on room air. Lung examination reveals bilateral inspiratory crackles in the lung bases. High-resolution CT shows patchy areas of ground glass, reticular abnormalities, and traction bronchiectasis. Laboratory findings are normal except for an elevated erythrocyte sedimentation rate of 54 mm/hr. What is the recommended treatment for this patient’s cough?

190) A 38-year-old woman has been complaining of a 2-year history of increasing dyspnea and fatigue. Physical examination reveals increased JVP and a reduced carotid pulse. Precordial examination reveals a left parasternal lift, loud P2, and right-sided S3 and S4. There are no audible murmurs. CXR reveals clear lung fields and an ECG shows evidence of right ventricular hypertrophy. Pulmonary function tests show a slight restrictive pattern. Primary pulmonary hypertension is diagnosed. Which of the following treatments is helpful in this condition?

191) A 1-year-old child with cerebral palsy secondary to perinatal asphyxia presents to her general pediatrician for a well-child visit. She was delivered at 37 weeks’ gestation by emergency cesarean section for a tight nuchal chord. The patient has severe spastic quadriparesis that is limiting her movements. She also has mental retardation and is unable to speak. She has received physical and occupational therapy since early infancy; however, her parents are concerned by her lack of improvement. Which of the following is the best choice for treatment of spasticity in this child?

192) A 66-year-old man has progressive shortness of breath due to COPD. He is currently able to do his activities of daily living, but has trouble walking more than one block. His physical examination reveals hyperinflation, increased resonance to percussion, and bilateral expiratory wheezes. He is on appropriate medical therapy for his stage of COPD. Which of the following is also indicated in the management of this condition?

193) A 52-year-old man develops sudden-onset shortness of breath on postoperative day 4 after a hemicolectomy for colon cancer. His surgery went well with no operative complications. He reports no cough, sputum, or pleuritic chest pain. His blood pressure is 155/90 mm Hg, pulse 100/min, temperature 37.8°C, lungs are clear, and heart sounds normal. He has bilateral pedal edema, but no discomfort in his legs. His CXR and ECG are normal. A chest CT with contrast reveals a thrombus in his right upper lobe artery. Which of the following statements concerning the management of this condition is most likely correct?