CRAT - Certified Rhythm Analysis Technician Atrioventricular (AV) Blocks Questions and Answers

Question 1

A rhythm analysis technician observes an ECG strip where the PR interval is consistently 0.26 seconds for every beat.
The rhythm is regular, with an atrial and ventricular rate of 68 bpm.
Each P wave is followed by a QRS complex.
What is the correct interpretation?

Accepted Answer

First-Degree AV Block

Answer

Normal Sinus Rhythm

Answer

Second-Degree AV Block, Mobitz I

Answer

Sinus Bradycardia

Question 2

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

Accepted Answer

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

Answer

A constant PR interval with intermittently dropped QRS complexes.

Answer

Complete dissociation of P waves and QRS complexes.

Answer

A fixed 2:1 ratio of P waves to QRS complexes.

Question 3

A patient's ECG shows a regular atrial rate of 80 bpm and an irregular ventricular rate of approximately 40 bpm. The PR interval for all conducted beats is constant at 0.22 seconds. There are P waves that are not followed by a QRS complex. This pattern is most consistent with which arrhythmia?

Accepted Answer

Second-Degree AV Block, Mobitz II

Answer

Second-Degree AV Block, Mobitz I

Answer

Third-Degree AV Block

Answer

First-Degree AV Block with premature ventricular contractions

Question 4

A CRAT is analyzing a rhythm strip and observes complete AV dissociation. The atrial rate (P-P interval) is regular at 100 bpm, and the ventricular rate (R-R interval) is regular at 42 bpm. There is no consistent relationship between the P waves and the QRS complexes. What is this rhythm?

Accepted Answer

Third-Degree AV Block

Answer

Second-Degree AV Block, Mobitz II with 2:1 conduction

Answer

Atrial Fibrillation with a slow ventricular response

Answer

Sinus Arrhythmia with a junctional escape rhythm

Question 5

Which of the following atrioventricular blocks is considered more clinically significant and has a higher risk of progressing to a complete heart block, often requiring pacemaker implantation?

Accepted Answer

Second-Degree AV Block, Mobitz II

Answer

First-Degree AV Block

Answer

Second-Degree AV Block, Mobitz I (Wenckebach)

Answer

2:1 AV Block with a narrow QRS

Question 6

A technician reviews a rhythm strip showing an atrial rate of 75 bpm and a ventricular rate of 38 bpm. The P-P interval is regular, and the R-R interval is regular. P waves can be seen marching through the QRS complexes, with some appearing just before, some buried within, and some after the QRS. This describes:

Accepted Answer

Third-Degree AV Block

Answer

Second-Degree AV Block, Mobitz I

Answer

First-Degree AV Block

Answer

Second-Degree AV Block, Mobitz II

A rhythm analysis technician observes an ECG strip where the PR interval is consistently 0.26 seconds for every beat.The rhythm is regular, with an atrial and ventricular rate of 68 bpm.Each P wave is followed by a QRS complex.What is the correct interpretation?

A rhythm analysis technician observes an ECG strip where the PR interval is consistently 0.26 seconds for every beat.
The rhythm is regular, with an atrial and ventricular rate of 68 bpm.
Each P wave is followed by a QRS complex.
What is the correct interpretation?