This case report is kindly provided by Michael Rosengarten from McGill and is part of the McGill Cases. These cases come from the McGill EKG World Encyclopedia.
These two strips from the same patient show a 2:1 block on the top tracing and a Mobitz II A/V block on the lower one. Note that with 2:1 block you can not tell if this is a Mobitz I or II. Mobitz II is seen below as the PR does not change before and after the non-conducted P wave.
