Name the heart rhythm that is caused by the irregular firing…

Name the heart rhythm that is caused by the irregular firing of the SA node related to changes in the intra-thoracic pressure from the respiratory cycle, resulting in a patterned irregularity where the heart rate speeds up with inspiration and decreases with expiration?

Your echo patient is a 70 year old man who passed out in chu…

Your echo patient is a 70 year old man who passed out in church and has been admitted to the Telemetry Floor.  You attach the ECG monitor and note the heart rate is about 40 beats per minute.  Your analysis of the ECG rhythm reveals two P waves preceding every QRS complex and the PR interval for the conducted beats remains constant at 0.20 seconds.  What is your interpretation of this ECG rhythm?