Answer - Case of the month (Feb 2012)
Q: This narrow complex rhythm shows an early beat after every three beats (group formation), which continued on a longer registration. What is you diagnosis?
A. Type 1 second degree AV block
B. Type 2 second degree AV block
C. Third degree AV block
D. Competition between sinus rhythm and nodal rhythm. No second or third degree AV block.
E. Escape capture bigemini
Correct answer: C. Third degree av block because we said so !!!