CVT Electrophysiology Studies & Catheter Ablation 2

Question 1

During programmed electrical stimulation (PES), what is the purpose of delivering extrastimuli (S2, S3)?

Accepted Answer

To induce tachyarrhythmias by scanning through refractory periods

Answer

To measure sinus node recovery time

Answer

To quantify His-Purkinje conduction velocity

Answer

To assess left ventricular systolic function

Question 2

What is the normal range for the AH interval in an EP study?

Accepted Answer

55–125 ms

Answer

10–30 ms

Answer

150–200 ms

Answer

200–300 ms

Question 3

On a 3D electroanatomical bipolar voltage map, purple/blue color typically represents:

Accepted Answer

Scar tissue with low bipolar voltage (<0.5 mV)

Answer

Normal myocardium with high bipolar voltage (>1.5 mV)

Answer

Areas of earliest activation during tachycardia

Answer

Catheter contact pressure points

Question 4

Pulmonary vein isolation (PVI) during atrial fibrillation ablation targets pulmonary vein ostia located in the:

Accepted Answer

Left atrium

Answer

Right ventricle

Answer

Coronary sinus

Answer

Superior vena cava

Question 5

During RF ablation, what is the primary reason to limit catheter tip temperature to approximately 50–60°C?

Accepted Answer

To prevent steam pops that can cause cardiac perforation

Answer

To maximize lesion depth without surface charring

Answer

To ensure adequate anticoagulation efficacy

Answer

To avoid damage to the fluoroscopy equipment

Question 6

Which conduction property is characteristic of the AV node and describes slowing of conduction with increasing pacing rates?

Accepted Answer

Decremental conduction

Answer

Automaticity

Answer

Triggered activity

Answer

Supernormal conduction

Question 7

Which two major complications are most feared during left-sided catheter ablation procedures requiring transseptal access?

Accepted Answer

Cardiac tamponade and thromboembolic stroke

Answer

Complete heart block and pulmonary hypertension

Answer

Renal failure and pneumothorax

Answer

Ventricular fibrillation and aortic dissection