Question

What is the type of AVB characterized by two p waves to each QRS and a constant PR interval? 1) First-degree AV block 2) Second-degree AV block 3) Third-degree AV block

Answer 1

A second-degree AV block is characterized by two P waves for each QRS complex and a constant PR interval on an ECG.

Step-by-step explanation:

A second-degree or incomplete heart block is characterized by two P waves for each QRS complex on an ECG, along with a constant PR interval. In this type of block, some impulses from the SA node reach the AV node and continue, while others do not.

As a result, some P waves are not followed by a QRS complex, while others appear normal. This is different from a first-degree AV block, which only shows a prolonged PR interval, and a third-degree AV block, where there is no correlation between atrial and ventricular activity.

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