hypertrophy anywhere in the av conduction system was seen in 77 % , 42 % , 78 % , 39 % , 30 % and 74 % of the cases with blocks , sick sinus syndrome , pre-excitation syndrome , other arrhythmias , normal hearts and hypertrophied hearts without arrhythmia , respectively .
C0032915
pre-excitation syndrome
C0003811
hearts