the most common type of arrhythmia among the patients under 5 was intraventricular conduction defects , whilst in the age group of 5-10 were sinus tachycardia and intraventricular conduction defects , and in the age group of 10-15 was first degree a-v block .
C0003811
arrhythmia
C0085614
first degree a-v block