[the return of] ECG of the WEEK 31

This was an elderly lady who came in complaining of "throbbing" in her neck.  Here's her ECG:

ECGotwmay6

 

Most of you should be able to describe the ECG, BUT can you figure out what the throbbing in her neck was?

Hint: you'll need to correlate the electro- and mechanical  activity of the heart.

 

 

 

Share your thoughts