Those of you who have followed the ECG Guru for a while are very familiar with the work of Dr. Ken Grauer, M.D.  He is a generous contributer to the ECG Guru website, and functions as our official Consulting Expert.  He has published many books and e-publications which are (in our opinion) some of the BEST ECG references available, and he has worked hard to keep them low priced to make them available to all of us.  He also offers seemingly endless ECG knowledge and insights for FREE, via this website, his own website, and social media.

If you are a teacher, watching a masterful teacher present your topic can help you develop your style, and increase your own knowledge of your subject.  We don't all have the opportunity to attend live classes by the real ECG Gurus of the world, but many of them are now making FREE video lectures available to all of us. Even if you are not an instructor, for many of us, hearing and seeing the presentation is a more effective way to learn than just reading.    

This is an ECG I performed a couple of years ago on an asymptomatic 83-year old man as an outpatient procedure. 

The computer interpreted this as:  "Marked sinus bradycardia [with] Frequent Premature ventricular complexes".  IS THE COMPUTER CORRECT?  Is there more than one plausible interpretation?  What is the differential diagnosis?

Patient data:  54-year old man who recently underwent a major cardiac procedure.  At first glance, this ECG may not appear to be particularly unique but a closer inspection reveals something unusual going on here. 

HINT:  The telling clue can be found in lead II but you'll have to use calipers and think "outside-the-box".  3 days after this ECG, the patient reverted back to sinus rhythm but continued to display this one finding.  Good luck!