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

Wider QRS complexes

Answer

Longer QT interval

Answer

Absence of a PR interval

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

75 bpm

Answer

300 bpm

Answer

200 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

P wave morphology is fixed in wandering atrial pacemaker

Answer

QRS is wider in wandering atrial pacemaker

Answer

PR interval is constant in wandering atrial pacemaker

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

Prolonged PR interval

Answer

ST segment depression

Answer

Complete heart block

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

P waves are clearly visible before each QRS with a normal PR interval

Answer

P waves are absent with chaotic baseline

Answer

P waves are sawtooth in appearance

Question 6

Which antiarrhythmic approach is considered first-line to terminate acute PSVT when vagal maneuvers have failed?

Accepted Answer

IV adenosine

Answer

IV amiodarone

Answer

IV lidocaine

Answer

Oral digoxin