CCT - Certified Cardiographic Technician Rhythm Analysis: Ventricular/Blocks Questions and Answers

Question 1

A patient's ECG strip shows a regular rhythm with a rate of 45 bpm.
The QRS complexes are wide (0.14 seconds), and there are no discernible P waves associated with the QRS complexes.
Which of the following rhythms is most likely represented?

Accepted Answer

Idioventricular rhythm

Answer

Junctional escape rhythm

Answer

Third-degree AV block with a junctional escape

Answer

Sinus bradycardia with bundle branch block

Question 2

Which of the following ECG findings is the hallmark characteristic of Third-Degree Atrioventricular (AV) Block?

Accepted Answer

Complete AV dissociation with atrial rate faster than ventricular rate

Answer

Progressively lengthening PR interval until a QRS is dropped

Answer

A constant PR interval with intermittently dropped QRS complexes

Answer

A heart rate consistently below 40 bpm with narrow QRS complexes

Question 3

A CCT observes a rhythm strip where the PR interval progressively lengthens for three consecutive beats, followed by a P wave that is not followed by a QRS complex. This pattern then repeats. How should this rhythm be identified?

Accepted Answer

Mobitz I Second-Degree AV Block (Wenckebach)

Answer

Mobitz II Second-Degree AV Block

Answer

First-Degree AV Block

Answer

Third-Degree AV Block

Question 4

A patient's monitor displays a regular, wide-complex tachycardia at a rate of 180 bpm. Which of the following features, if present, would most definitively confirm the rhythm is Ventricular Tachycardia (VT) rather than Supraventricular Tachycardia (SVT) with aberrancy?

Accepted Answer

Presence of fusion and capture beats

Answer

Patient is hemodynamically stable

Answer

QRS duration of 0.13 seconds

Answer

A history of atrial fibrillation

Question 5

When analyzing an ECG for Premature Ventricular Contractions (PVCs), which characteristic is typically observed?

Accepted Answer

A wide, bizarre QRS complex followed by a full compensatory pause

Answer

A narrow QRS complex (<0.12s) that is premature

Answer

A P wave preceding every premature QRS complex

Answer

A shortening of the R-R interval following the premature beat

Question 6

A patient's ECG shows a regular rhythm with a constant PR interval on all conducted beats. Suddenly, a P wave appears that is not followed by a QRS complex. This occurs unpredictably. This finding is most consistent with:

Accepted Answer

Mobitz II Second-Degree AV Block

Answer

Mobitz I Second-Degree AV Block

Answer

Third-Degree AV Block

Answer

Sinus Arrest