CRAT Atrial Arrhythmia Identification 3

Question 1

Which feature best distinguishes atrial tachycardia from sinus tachycardia on a 12-lead ECG?

Accepted Answer

Abnormal P wave axis or morphology differing from sinus P waves

Answer

Atrial tachycardia originates from an ectopic focus rather than the sinus node, producing P waves with an axis or morphology that differs from normal sinus P waves.

Question 2

A patient in atrial flutter with 2:1 conduction is most likely to show a ventricular rate near which value?

Accepted Answer

150 bpm

Answer

With typical atrial flutter at 300 bpm and 2:1 AV conduction, the ventricular rate is 300 divided by 2, equaling 150 bpm.

Question 3

Wandering atrial pacemaker differs from multifocal atrial tachycardia primarily by which criterion?

Accepted Answer

Heart rate is less than 100 bpm in wandering atrial pacemaker

Answer

Wandering atrial pacemaker has three or more P wave morphologies and an irregular rhythm but a rate less than 100 bpm, while MAT is defined by a rate of 100 bpm or greater.

Question 4

In a patient with Wolff-Parkinson-White syndrome who develops atrial fibrillation, which ECG feature poses the greatest danger?

Accepted Answer

Rapid conduction over the accessory pathway causing very fast ventricular rates

Answer

In WPW with atrial fibrillation, the accessory pathway bypasses the AV node rate-limiting function, allowing extremely rapid ventricular rates up to 300 bpm that can degenerate into ventricular fibrillation.

Question 5

Which of the following best describes the P wave in AVNRT?

Accepted Answer

P waves are often buried within or immediately after the QRS complex

Answer

In AVNRT, retrograde P waves are typically buried within or occur just after the QRS due to near-simultaneous atrial and ventricular depolarization, appearing as pseudo-r in V1 or pseudo-S in inferior leads.

CRAT - Certified Rhythm Analysis Technician Practice Test

CRAT - Certified Rhythm Analysis Technician Practice Test

CRAT Atrial Arrhythmia Identification 3