the study was carried out on 60 consecutive patients ( 23 males and 37 females ) aged between 20 and 83 years ( means +/- sd , 40.7 +/- 16 ) who arrived at our cardiologic unit with paroxysmal supraventricular arrhythmias ( psva ) including junctional paroxysmal tachycardia ( n = 32 ) , atrial fibrillation ( n = 13 ) , atrial flutter ( n = 1 ) , premature beats ( n = 13 ) and with no obvious cardiovascular causes .
C0004238
atrial fibrillation
C0007226
cardiovascular