Using cardiac leads the right way.
Drew
B J
BJ
D001145:Arrhythmias, Cardiac / Q000175:diagnosis* / Q000451:nursing; D004562:Electrocardiography / Q000295:instrumentation* / Q000451:nursing; D004566:Electrodes / Q000592:standards*; D006801:Humans; D008297:Male; D008875:Middle Aged