This 81 year old woman presents to her GP with blackouts lasting a few seconds. What does her ECG show? A Sinus rhythm with Mobitz I second degree (Wenckebach) AV block The ECG shows consistent p ...

A 68-year-old male with morbid obesity and no past medical history comes to the office complaining of fatigue and shortness of breath. He does not feel dizzy and has never passed out. He takes no ...

This ECG is classic for 3rd degree heart block, also known as complete heart block. For a complete review of 3rd degree AV block, see the Third Degree AV Block ECG Review.

At first glance, the P waves and QRS complexes do not seem to have any relationship, which raises the possibility of 3 o AV block. Since the QRS complexes do not occur regularly, however, that option ...