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Quizzes > Health & Medicine

Dysrhythmia Quiz: Test Your ECG Rhythm Skills

Quick, free heart rhythm quiz to practice ECG basics. Instant results.

Editorial: Review CompletedCreated By: Emil Wallin TindelandUpdated Aug 24, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art heart with EKG waveform on sky blue background representing cardiac dysrhythmia quiz challenge

This dysrhythmia quiz helps you practice ECG rhythm interpretation and spot irregular beats with confidence. Work through realistic strips, build speed, and get quick explanations as you go. For extra practice, try the 6 second ecg quiz, explore cardiology quiz questions and answers, or review NCLEX cardiovascular questions.

What is the normal resting heart rate range for sinus rhythm in adults?
40 - 60 beats per minute
60 - 100 beats per minute
100 - 120 beats per minute
30 - 50 beats per minute
A normal adult sinus rhythm fires at 60 - 100 bpm. Rates below this range indicate bradycardia, and rates above indicate tachycardia. The sinoatrial node sets this range in healthy individuals. .
Which ECG wave represents atrial depolarization?
QRS complex
T wave
U wave
P wave
The P wave corresponds to atrial depolarization. The QRS complex represents ventricular depolarization, and the T wave reflects ventricular repolarization. U waves are small and not always present. .
What is the normal duration of the PR interval on an ECG?
120 - 200 milliseconds
200 - 300 milliseconds
40 - 80 milliseconds
80 - 120 milliseconds
The PR interval normally ranges from 120 to 200 ms, reflecting conduction from the atria through the AV node. A longer interval suggests first-degree AV block. Shorter intervals may indicate accessory pathway conduction. .
What is the typical width of a normal QRS complex?
More than 160 milliseconds
Less than 120 milliseconds
120 - 140 milliseconds
140 - 160 milliseconds
A normal QRS duration is under 120 ms, indicating coordinated ventricular depolarization. Wider complexes suggest bundle branch blocks or ventricular origin rhythms. Narrow QRS complexes originate above the ventricles. .
Bradycardia is defined as a heart rate below which threshold?
80 beats per minute
60 beats per minute
70 beats per minute
50 beats per minute
Bradycardia is defined as a heart rate less than 60 bpm at rest. It can be normal in athletes or pathological due to conduction issues. Symptoms may include dizziness or syncope if perfusion is compromised. .
Tachycardia is characterized by a resting heart rate exceeding what value?
80 beats per minute
120 beats per minute
100 beats per minute
90 beats per minute
Tachycardia refers to a resting heart rate over 100 bpm. It may be sinus in origin or due to atrial or ventricular arrhythmias. Persistent tachycardia can reduce diastolic filling time. .
Which ECG leads are considered the inferior leads?
I, aVL, V5
II, III, aVF
V4, V5, V6
V1, V2, V3
Leads II, III, and aVF view the inferior wall of the heart supplied by the right coronary artery. Changes here indicate inferior ischemia or infarction. Other leads view septal, anterior, and lateral regions. .
What artifact on ECG tracing is caused by patient movement or muscle tremor?
Baseline wander
Electrode pop
AC interference
Somatic tremor
Somatic tremor appears as irregular fuzzy waves due to muscle activity or patient movement. Baseline wander is slow shifting, AC interference shows 50 - 60 Hz sine waves, and electrode pop is abrupt spikes. Proper patient preparation minimizes these artifacts. .
Which ECG feature is characteristic of atrial fibrillation?
Fixed PR interval with sawtooth waves
Wide QRS complexes with AV dissociation
Regular narrow QRS complexes at 150 bpm
Irregularly irregular R - R intervals with absent P waves
Atrial fibrillation shows no discrete P waves and an irregularly irregular ventricular response. Sawtooth waves suggest atrial flutter, while fixed PR intervals imply first-degree block. AV dissociation and wide QRS suggest ventricular rhythms. .
Atrial flutter typically presents with what ECG pattern?
Prolonged QRS duration with slurred upstroke
Delta waves preceding each QRS
Sawtooth F waves, especially in leads II, III, aVF
Irregular P waves with variable PR intervals
Atrial flutter exhibits rapid atrial rate with sawtooth F waves predominantly in inferior leads. Irregular P waves without pattern suggest fibrillation, and delta waves indicate WPW syndrome. QRS slurring is seen in pre-excitation. .
Which finding suggests ventricular tachycardia rather than supraventricular tachycardia with aberrancy?
Narrow QRS complex at 180 bpm
Regular rhythm with P waves preceding each QRS
Upright P waves in leads II and aVF
AV dissociation with fusion beats
AV dissociation and fusion beats are hallmarks of VT. SVT with aberrancy usually has 1:1 P-to-QRS relationship and narrow complexes. Fusion beats arise when atrial and ventricular impulses coincide. .
What ECG finding defines a first-degree AV block?
PR interval longer than 200 milliseconds
Dropped QRS complex every third beat
Progressive PR prolongation before a dropped beat
No relationship between P waves and QRS
First-degree AV block is simply a prolonged PR interval >200 ms with each P wave conducted. Mobitz I shows progressive PR lengthening, Mobitz II shows dropped beats without PR change, and complete block shows AV dissociation. .
Which pattern is seen in Mobitz type I (Wenckebach) second-degree AV block?
Constant PR interval with intermittent dropped beats
P waves buried in QRS complexes
Progressively lengthening PR intervals until a beat is dropped
Random P waves not related to QRS
Mobitz I shows a progressive PR interval increase until one P wave fails to conduct. Mobitz II has fixed PR intervals with sudden dropped beats. Complete block shows AV dissociation. .
Which ECG finding is characteristic of Mobitz type II second-degree AV block?
PR interval less than 120 milliseconds
No visible P waves
Fixed PR intervals with occasional nonconducted P waves
Progressive PR prolongation before dropped beats
Mobitz II has a constant PR interval with sudden dropped QRS complexes. This block is more dangerous and often requires pacing. Mobitz I shows progressive prolongation, and complete block shows total AV dissociation. .
Right bundle branch block on ECG is indicated by which pattern in lead V1?
RSR? pattern ('rabbit ears')
Deep S wave with small r wave
Wide monophasic R wave
Notched T wave
RBBB shows an RSR? ('rabbit ears') in V1 due to delayed right ventricular activation. Left BBB shows broad or notched R waves in V5 - V6. Monophasic patterns indicate other pathologies. .
Which ECG finding is typical of a left bundle branch block?
Delta wave preceding QRS
Broad, notched R waves in leads I, V5, V6
RSR? in lead V1
Q waves in leads II, III, aVF
LBBB shows broad (>120 ms), notched R waves in I, V5, V6 and deep S waves in V1 - V2. RSR? in V1 implies RBBB. Delta waves indicate pre-excitation. Inferior Q waves suggest infarction. .
Which ECG feature is diagnostic of torsades de pointes?
Irregularly irregular rhythm with no P waves
Monomorphic wide complex tachycardia
Regular narrow complex tachycardia at 200 bpm
Polymorphic QRS complexes twisting around the baseline
Torsades presents as a polymorphic VT with QRS complexes that appear to twist around the isoelectric line, often in the context of prolonged QT. Monomorphic VT has uniform QRS morphology, and AF has no organized QRS twisting. .
What ECG pattern is seen in ventricular fibrillation?
Prolonged PR interval with dropped beats
Chaotic, irregular waves with no identifiable QRS complexes
Regular wide complexes at 300 bpm
Sawtooth atrial activity with variable ventricular response
Ventricular fibrillation shows irregular, chaotic electrical activity with no discernible P waves, QRS complexes, or T waves, indicating no effective ventricular contraction. Sawtooth waves are atrial flutter. PR prolongation is AV block. .
Pulseless electrical activity (PEA) is characterized by which finding?
Regular bradycardia with P waves before each QRS
Wide QRS complexes with AV dissociation
Organized ECG rhythm without a detectable pulse
Chaotic ECG activity with coarse waves
PEA presents with an organized electrical rhythm on ECG but no palpable pulse or cardiac output. VF is chaotic with no organized complexes. Bradycardia still yields a pulse. AV dissociation suggests VT or complete block. .
Which ECG change is associated with hyperkalemia?
Peaked T waves and widened QRS
Delta waves and short PR interval
ST-segment elevation in V1 - V4
Flattened T waves and U waves
Hyperkalemia causes peaked T waves, prolonged PR, widened QRS, and eventually a sine-wave pattern. Flattened T waves and U waves indicate hypokalemia. ST elevations are ischemic, and delta waves indicate pre-excitation. .
Hypokalemia on ECG is most likely to show which feature?
Prominent U waves and flattened T waves
Wide QRS and sine-wave pattern
Shortened QT interval
Tall, peaked T waves
Hypokalemia often produces flattened T waves, prominent U waves, and ST depression. Peaked T waves and sine waves are hyperkalemia features. QT interval is prolonged in hypokalemia rather than shortened. .
Which ECG finding is diagnostic of Wolff - Parkinson - White syndrome?
Deep Q waves in V1 - V2
Short PR interval and delta wave
Sawtooth waves in inferior leads
Prolonged QT interval
WPW shows a short PR interval (<120 ms) and a delta wave, reflecting pre-excitation via an accessory pathway. Sawtooth waves indicate atrial flutter, and prolonged QT may lead to torsades. Deep Q waves suggest infarction. .
Which ECG finding suggests a junctional rhythm?
Delta waves and short PR interval
Absent or inverted P waves with narrow QRS at 40 - 60 bpm
Prominent U waves and wide QRS
Irregularly irregular rhythm with no P waves
Junctional rhythms originate near the AV node, causing absent or inverted P waves (often after QRS) and a rate of 40 - 60 bpm with narrow QRS. Delta waves show WPW, U waves show hypokalemia, and irregular rhythm is fibrillation. .
Which criteria help distinguish ventricular tachycardia from supraventricular tachycardia with aberrancy?
Short PR interval and delta waves
AV dissociation, capture beats, and concordance in precordial leads
Sawtooth flutter waves with fixed block
Narrow QRS complexes and regular rhythm
VT often shows AV dissociation, fusion or capture beats, and either positive or negative concordance across V1 - V6. SVT with aberrancy has P waves preceding QRS and typical bundle branch patterns without dissociation. Delta waves and flutter waves indicate other arrhythmias. .
Which ECG pattern is diagnostic of Brugada syndrome?
Coved ST-segment elevation ?2 mm in V1 - V3 with T-wave inversion
Prolonged QT interval >500 ms
Delta waves and short PR interval
Deep Q waves in inferior leads
Brugada syndrome type 1 shows coved ST elevation ?2 mm in V1 - V3 followed by inverted T waves. Delta waves indicate WPW, deep Q waves suggest infarction, and long QT predisposes to torsades de pointes. .
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Study Outcomes

  1. Identify Common Dysrhythmias -

    Use the cardiac dysrhythmia quiz scenarios to recognize and name key arrhythmias such as atrial fibrillation, ventricular tachycardia, and more.

  2. Analyze ECG Patterns -

    Interpret ECG tracings featured in this dysrhythmia test to distinguish normal sinus rhythm from various abnormal heart rhythms.

  3. Apply Diagnostic Criteria -

    Use standardized criteria from our dysrhythmia practice questions to accurately classify and diagnose irregular cardiac rhythms.

  4. Evaluate Management Strategies -

    Assess appropriate immediate and long-term interventions for different arrhythmias based on quiz feedback and explanations.

  5. Enhance Clinical Decision-Making -

    Integrate insights from the cardiac dysrhythmia test to strengthen your ability to make evidence-based treatment decisions in real-world scenarios.

Cheat Sheet

  1. ECG Waveform Essentials -

    Master the P wave, PR interval, QRS complex and T wave to distinguish normal from pathological rhythms; for instance, a PR interval >200 ms may indicate first-degree AV block (AHA, JACC). Use the mnemonic "PRQRS-T" ("Please Remember Quick Rhythms Set Tone") to lock in the order. A solid ECG foundation powers every dysrhythmia test and cardiac dysrhythmia quiz challenge.

  2. Heart Rate Calculation Techniques -

    Practice the 300-, 150-, 100-, 75-, 60-, 50-method on 1-mm ECG boxes: count large squares between R waves and divide 300 by that number (University of Oxford). Alternatively, use the 6-second strip method (count complexes × 10) for irregular rhythms. These formulas make rapid rate estimates a breeze on any dysrhythmia quiz or practice questions.

  3. Common Arrhythmia Recognition -

    Be able to spot atrial fibrillation (irregularly irregular, no P waves), atrial flutter (sawtooth pattern at ~300 bpm), SVT (narrow complex, >150 bpm), VT (wide complex, ≥3 beats) and VF (chaotic waves) using ACLS guidelines (American Heart Association). A handy memory phrase is "A FiVe Saws Very Fast" for A-Fib, A-Flutter, SVT, VT, VF. Recognizing these patterns is critical for acing your cardiac dysrhythmia test.

  4. ACLS Algorithm for Bradycardia and Tachycardia -

    Follow the stepwise ACLS flowcharts: for symptomatic bradycardia start with atropine (0.5 mg IV), then pacing or dopamine; for stable tachycardia use vagal maneuvers, then adenosine (6 mg IV push) before synchronized cardioversion (ACLS Manual). Familiarity with these algorithms boosts confidence on real-world scenarios in your dysrhythmia quiz. Practice decision trees to streamline critical interventions.

  5. Antiarrhythmic Drug Classes -

    Review the Vaughan-Williams classification: Class I (Na+ blockers), Class II (β-blockers), Class III (K+ blockers), Class IV (Ca2+ blockers) and Others (adenosine, digoxin); remember "Double Quarter Pounder, Lettuce, Mayo, Fries, Please" for I - V. Know indications - e.g., amiodarone for VT/VF, procainamide for WPW - and key side effects. Solid pharmacology recall helps you breeze through dysrhythmia practice questions and the cardiac dysrhythmia quiz alike.

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