Mobitz II heart block is characterized on a surface ECG by intermittently nonconducted P waves not preceded by PR prolongation and not followed by PR shortening. There is usually a fixed number of non-conducted P waves for every successfully conducted QRS complex, and this ratio is often specified in describing Mobitz II blocks.  #Clinical #EM #IM #Cardiology #MedStudent #EKG #MobitzII #Mobitz2 #Mobitz #ECGEducator