text: <unk><unk><unk>  may have a variety of manifestations on the electrocardiogram.  The diagnosis of an PACs is made when a P wave with a morphology different from that of the sinus P wave (inverted or biphasic) occurs earlier than the anticipated sinus P wave.  It is always advisory to examine each lead as subtle differences in morphology may be present.
option_0: Premature atrial contraction electrocardiogram
option_1: Premature ventricular contraction electrocardiogram
option_2: Intraventricular conduction delay electrocardiogram
option_3: Junctional bradycardia electrocardiogram
option_4: Pulseless ventricular tachycardia electrocardiogram
option_5: Ventricular fibrillation electrocardiogram
option_6: Atrial flutter electrocardiogram
option_7: Junctional tachycardia electrocardiogram