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Question 1
During AVRT, a HIS-refractory PVC will do what to the arrhythmia?
Correct Answer:
Break the arrhythmia
Explanation:
AVRT is a reentrant circuit that depends on conduction through the ventricles, the AV node, and an accessory pathway to keep looping. If a ventricular premature beat occurs while the His-Purkinje system is refractory, that impulse cannot travel up through the AV node or participate in the reentrant loop. This disruption breaks the circuit and terminates the tachycardia. So a His-refractory PVC can stop AVRT rather than prolong conduction, accelerate the tachycardia, or have no effect.
Question 2
AVNRT affects most commonly which population?
Correct Answer:
Females 20-30
Explanation:
AVNRT is the most common form of paroxysmal SVT and shows a clear female predominance, with most cases starting in young adulthood. The typical patient is a woman in her 20s to 30s. This age-and-sex pattern reflects how AV nodal dual-pathway physiology tends to manifest clinically in this group. While AVNRT can occur outside this range, the combination of being female and in the 20s–30s is the most frequently observed presentation, making that population the best answer.
Question 3
What method is used during pace mapping to identify the exit site of VT?
Correct Answer:
Comparison of paced QRS morphology with VT QRS morphology on the 12-lead ECG.
Explanation:
During pace mapping, the exit site of VT is identified by pacing from different endocardial sites and comparing the resulting QRS morphology to the VT QRS on the 12-lead ECG. When the paced QRS closely matches the VT QRS, the pacing site is likely at or near the VT exit, because the activation pattern sent from that site drives the same ventricular activation sequence seen in the VT. A good match across multiple leads indicates proximity to the exit path and helps target the ablation. This approach relies on morphological correlation, not on measuring stimulus duration, focusing solely on unipolar signals, or waiting for spontaneous QRS morphs, which do not localize the exit site in the same way.
Question 4
How does AV block typically affect atrial tachycardia?
Correct Answer:
AV block does not affect tachycardia.
Explanation:
In atrial tachycardia, the rapid rhythm comes from an ectopic focus in the atria, outside the AV node. AV block changes how many of those atrial impulses reach the ventricles, not the source of the tachycardia itself. So the atrial rate—the tachycardia rate—continues regardless of the block. What you’ll see is a modified ventricular response: fewer impulses get through, so the ventricular rate may be slower or irregular, but the atrial tachycardia keeps going. The block doesn’t terminate, accelerate, or convert the atrial tachycardia into another rhythm; it mainly affects how the ventricles respond to the atrial rate.
Question 5
The resting potential of nodal cells is primarily maintained by which type of channels?
Correct Answer:
Slow Calcium Channels
Explanation:
Nodal (pacemaker) cells rely on slow calcium influx to set and progress toward threshold. In these cells there aren’t many fast sodium channels, so there isn’t a quick, Na+-driven upstroke like in ventricular tissue. Instead, the inward current through slow calcium channels slowly depolarizes the membrane during diastole, driving the pacemaker activity that maintains their characteristic resting/pacemaker potential. Chloride channels aren’t the main driver here, and potassium leak channels provide only a background set point rather than the depolarizing force.
Question 1
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Prepare with the Electrophysiology Unit (EPU) 26.19 Practice Test practice quiz. This question bank includes 10 questions covering avrt, site, his-refractory, electrophysiology, and unit. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Electrophysiology Unit (EPU) 26.19 Practice Test

This practice set contains 10 questions from the matching question bank and focuses on avrt, site, his-refractory, electrophysiology, and unit. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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