CRAT Study Guide 2026

Everything you need to pass the CRAT exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.

📋 CRAT Exam Format at a Glance

130

Questions

120 min

Time Limit

72%

Passing Score

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📚 CRAT Topics to Study (45)

Arrhythmia Recognition, Anatomy, and Physiology · 11 cards ECG Interpretation · 11 cards Bundle Branch Blocks and Fascicular Blocks · 7 cards Bundle Branch Blocks and Fascicular Blocks · 7 cards Bundle Branch Blocks and Fascicular Blocks · 7 cards Antiarrhythmic Medications and Clinical Interventions · 6 cards Antiarrhythmic Medications and Clinical Interventions · 6 cards Antiarrhythmic Medications and Clinical Interventions · 6 cards Arrhythmia Recognition, Anatomy, and Physiology · 6 cards Arrhythmia Recognition, Anatomy, and Physiology · 6 cards Atrial Arrhythmia Identification · 6 cards Atrial Arrhythmia Identification · 6 cards Atrioventricular (AV) Blocks · 6 cards Atrioventricular (AV) Blocks · 6 cards Cardiac Anatomy and Physiology · 6 cards Cardiac Anatomy and Physiology · 6 cards Atrial Arrhythmia Identification · 6 cards Atrioventricular (AV) Blocks · 6 cards Cardiac Anatomy and Physiology · 6 cards ECG Troubleshooting and Artifacts · 6 cards Junctional Rhythm Analysis · 6 cards Life-Threatening Arrhythmias · 6 cards Pacemaker Rhythm Analysis · 6 cards Patient Monitoring and Safety · 6 cards Sinus Rhythm Interpretation · 6 cards Ventricular Arrhythmia Identification · 6 cards ECG Interpretation · 6 cards ECG Interpretation · 6 cards ECG Troubleshooting and Artifacts · 6 cards ECG Troubleshooting and Artifacts · 6 cards

See all 45 topics as flashcards →

✍️ Sample CRAT Questions & Answers

1. Which of the following ECG findings is the defining characteristic of Second-Degree AV Block, Mobitz I (Wenckebach)?

✓ Progressive lengthening of the PR interval until a QRS complex is dropped.

The hallmark of Second-Degree AV Block, Mobitz I (Wenckebach) is the progressive prolongation of the PR interval over several beats, culminating in a P wave that is not followed by a QRS complex (a dropped beat). [2, 6, 18] After the dropped beat, the cycle typically repeats.

2. Which of these is a method that can be used to calculate the ventricular rate of a cardiac rhythm when the R-R is regular?

✓ Divide the number of large boxes between 2 R waves into 300

Explanation: To calculate the ventricular rate when the R-R intervals are regular, divide 300 by the number of large boxes between two consecutive R waves on the ECG strip. This method provides an estimate of the heart rate in beats per minute (bpm).

3. When a patient with a pacemaker is receiving electrocautery during surgery, which pacemaker problem can occur?

✓ Oversensing of electrocautery current causing pacemaker inhibition

Electrosurgical (Bovie) current can be sensed by the pacemaker as cardiac activity (oversensing), inhibiting pacing output — dangerous in pacemaker-dependent patients who may develop bradycardia or asystole.

4. An ECG shows a QRS of 0.14 sec with broad notched R waves in I, aVL, V5–V6 and a broad QS in V1. What is the most likely diagnosis?

✓ Left bundle branch block

Broad notched R waves in lateral leads (I, aVL, V5–V6) combined with a QS pattern in V1 and a QRS ≥0.12 seconds are the hallmark features of left bundle branch block.

5. Why should the defibrillator be kept readily accessible near monitored patients in the cardiac care unit?

✓ Life-threatening arrhythmias such as VF or pulseless VT can occur without warning and require immediate defibrillation

Immediate defibrillation within the first minutes of VF is the most critical determinant of survival, so defibrillators must be immediately available in monitored care settings.

6. Procainamide's primary antiarrhythmic mechanism is:

✓ Blocking fast sodium channels to slow conduction

Procainamide is a Class IA sodium channel blocker that slows intraventricular conduction and prolongs the refractory period.

🎯 Free CRAT Practice Tests

ECG Interpretation · 11 questions Arrhythmia Recognition, Anatomy, and Physiology · 11 questions Bundle Branch Blocks and Fascicular Blocks · 7 questions Bundle Branch Blocks and Fascicular Blocks · 7 questions Bundle Branch Blocks and Fascicular Blocks · 7 questions Sinus Rhythm Interpretation · 6 questions Cardiac Anatomy and Physiology · 6 questions Atrial Arrhythmia Identification · 6 questions Junctional Rhythm Analysis · 6 questions Junctional Rhythm Analysis · 6 questions

📖 CRAT Guides & Articles

Your CRAT Study Path

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