supraventricular arrhythmias ( paroxysmal atrial tachycardia ) appeared in 73 % of rats compared with only 18 % of guinea-pigs whereas ventricular arrhythmias ( ventricular tachycardia ) , multiple premature ventricular contractions and or multifocal pvc 's occurred in 100 % of guinea-pigs compared with only 32 % of rats .
C0085612
ventricular arrhythmias
C0042514
ventricular tachycardia