What is the primary consequence of a first degree AV block?

What is the primary consequence of a first degree AV block?

• A. It eliminates heartbeats
• B. It leads to increased heart rate
• C. It lengthens the delay between atrial and ventricular depolarization
• D. It causes irregular heart rhythms

Answer: (C)

The primary consequence of a first-degree AV block is that it lengthens the delay between atrial and ventricular depolarization. This type of block occurs when the electrical signals traveling from the atria to the ventricles encounter a delay at the atrioventricular (AV) node. As a result, there is an extended PR interval on the EKG, which reflects the increased time it takes for the electrical impulse to pass through the AV node before it reaches the ventricles. While this delay does not eliminate heartbeats or cause significant changes in heart rate or rhythm, it is indicative of some degree of conduction disturbance in the heart's electrical system. Maintaining an intact and regular rhythm is crucial, and while a first-degree AV block typically doesn't cause significant issues or symptoms, it is a notable finding that indicates the need for monitoring.