CMT Cardiac Dysrhythmias and Arrhythmias 2

Question 1

Which arrhythmia is characterized by a sawtooth flutter wave pattern at a rate of 250-350 bpm?

Accepted Answer

Atrial flutter

Answer

Atrial flutter produces a characteristic sawtooth flutter wave pattern (F waves) at 250-350 bpm, best seen in leads II, III, and aVF.

Question 2

A patient's ECG shows no discernible P waves, an irregularly irregular rhythm, and a ventricular rate of 110 bpm. What is the most likely diagnosis?

Accepted Answer

Atrial fibrillation

Answer

Atrial fibrillation is characterized by the absence of distinct P waves, a chaotic baseline, and an irregularly irregular ventricular response.

Question 3

What is the typical ventricular rate in untreated atrial flutter with 2:1 conduction?

Accepted Answer

150 bpm

Answer

With an atrial rate of 300 bpm and 2:1 AV conduction, exactly half the atrial impulses conduct, yielding a ventricular rate of approximately 150 bpm.

Question 4

Which arrhythmia is most commonly associated with Wolff-Parkinson-White (WPW) syndrome?

Accepted Answer

Atrioventricular reentrant tachycardia (AVRT)

Answer

WPW syndrome involves an accessory pathway that creates a reentrant circuit, most commonly manifesting as AVRT.

Question 5

On a rhythm strip, premature beats with wide, bizarre QRS complexes and a fully compensatory pause are characteristic of:

Accepted Answer

Premature ventricular contractions

Answer

PVCs arise from ventricular foci, producing wide and bizarre QRS complexes (>0.12 sec) followed by a fully compensatory pause.

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