CRAT Ventricular Arrhythmia Identification 3

Question 1

The morphology of a PVC can provide information about where in the ventricle the ectopic focus is located. A PVC with LBBB morphology (negative QRS in V1) suggests the focus is located where?

Accepted Answer

Right ventricle

Answer

Left ventricle

Answer

AV node

Answer

SA node

Question 2

Idioventricular rhythm (ventricular escape rhythm) is expected to fire at which rate range?

Accepted Answer

20-40 bpm

Answer

40-60 bpm

Answer

60-100 bpm

Answer

Less than 20 bpm

Question 3

Which clinical condition most commonly causes unifocal PVCs in hospitalized patients without structural heart disease?

Accepted Answer

Electrolyte disturbances (hypokalemia, hypomagnesemia)

Answer

Structural valve disease

Answer

Complete heart block

Answer

Congenital long QT syndrome

Question 4

Ventricular flutter is best described by which ECG appearance?

Accepted Answer

Regular sinusoidal wide complex tachycardia at 200-300 bpm with no discernible QRS-T separation

Answer

Irregular wide complex tachycardia

Answer

Regular narrow complex tachycardia at 200 bpm

Answer

Completely chaotic electrical activity

Question 5

In patients with frequent PVCs, which marker is most predictive of adverse outcomes (increased risk of sudden cardiac death)?

Accepted Answer

Presence of underlying structural heart disease, particularly reduced left ventricular ejection fraction

Answer

PVC rate exceeding 10 per hour

Answer

PVCs showing LBBB morphology

Answer

PVCs occurring during the day

Question 6

What is the hallmark ECG finding that distinguishes accelerated idioventricular rhythm (AIVR) from ventricular tachycardia?

Accepted Answer

Rate: AIVR is 60-100 bpm while VT is 100 bpm or greater

Answer

AIVR has narrow QRS complexes

Answer

AIVR is associated with P waves before each QRS

Answer

AIVR occurs only during sleep