Question

When no atrial impulse is conducted through the AV node into the ventricles, the patient is said to be experiencing which type of AV block?

a) First degree
b) Second degree, type II
c) Third degree
d) Second degree, type I

Answer 1

The correct answer is c) Third degree AV block. In a third-degree AV block, no atrial impulse is conducted through the AV node into the ventricles.

Step-by-step explanation:

The correct answer is c) Third degree AV block.

An AV block occurs when there is a disruption in the conduction pathway between the atria and ventricles. In a third-degree AV block, also known as a complete heart block, no atrial impulse is conducted through the AV node into the ventricles.

This means that there is no correlation between atrial activity (P wave) and ventricular activity (QRS complex) on an ECG. The heart rate (pulse) in a third-degree AV block may be slow and irregular, as the AV node acts as a secondary pacemaker, resulting in a slower heart rate.