Question

The basic rhythm is atrial flutter with variable AV block. When 2:1 conduction ratios occur there is a rate-dependent LBBB. Do not be fooled by the wide QRS tachycardia on the bottom strip. It is not ventricular tachycardia, but atrial flutter with 2:1 conduction and LBBB. Lidocaine is not needed because there is no ventricular ectopy.

Answer 1

In a third-degree block, there is no correlation between atrial activity and ventricular activity, resulting in an affected heart rate or pulse that can be slow or irregular.

Step-by-step explanation:

In a third-degree block, there is no correlation between atrial activity (the P wave) and ventricular activity (the QRS complex). This means that some of the impulses initiated by the SA node do not reach the AV node, while others do. Additionally, the P waves are not followed by the QRS complex. As a result, the heart rate or pulse would be affected and can be either slow or irregular.