Identify the possible problems with the heart of each of the

Identify the possible problems with the heart of each of the following ECG strips

1. The first ECG shows bundle branch block.

In this the the rhythm is regular. P wave and the PR interval is normal but the QRS is wide.

2. The second ECG shows Premature Ventricular Complex Quadrigeminy

In this the the rhythm is irregular. P wave is absent and the PR interval is not measurable. The QRS is wide.

3. The third ECG shows sinoatrial block

In this the the rhythm is irregular when the block occurs. P wave, PR interval and QRS are normal.