marching nuns

The appearance on an electrocardiogram (ECG) of a run of ventricular tachycardia that resembles a group of hooded figures praying in succession. This usually means the patient is in acute cardiac distress and needs immediate medical care.

I was doing vitals on my patient the other night and saw the marching nuns roll across the EKG. I hit the code alarm faster than I've ever done anything in my life.