ECGs showing normal and abnormal cardiac rhythms A Normal rhythm F Atrial flutter with 1:1 AV conduction QRS /Uuu G Monomorphic ventricular tachycardia B Premature ventricular beat W H Torsades de Pointes Paroxysmal supraventricular tachycardia (PSVT) D Atrial fibrillation I Ventricular fibrillation VM1K-1 MK1M6y E Atrial flutter with variable AV conductionECGs showing normal and abnormal cardiac rhythms