Question

The type of AV block most likely to cause cardiovascular collapse is:

A) Sinus bradycardia
B) First-degree AV block
C) Second-degree AV block
D) Third-degree AV block

Answer 1

The third-degree AV block is the type of heart block most likely to lead to cardiovascular collapse because it represents a complete disconnection between the atrial and ventricular electrical activity in the heart.

Step-by-step explanation:

The type of AV (atrioventricular) block most likely to cause cardiovascular collapse is D) Third-degree AV block. This condition, also known as a complete heart block, is characterized by a complete disconnection between the atrial and ventricular electrical activity. In a third-degree AV block, the P waves, which represent atrial contraction, are not followed by the QRS complex, which indicates ventricular contraction. This lack of synchronization can lead to severely reduced heart output and may necessitate emergency intervention such as the placement of an artificial pacemaker to maintain adequate circulation.