[RLK]

I find it difficult to believe her initial condition was created by a heart attack and there has been no tendency for one since then. A heart attack als leave certain distortions in the QRST axes in heartbeats which are quite measurable. Don't ask me to explain it. The best description I know of is in Guytone's Textbook of Medical Physiology.

[texastoo]

A lack potassium or a low potassium level will cause the heart to throw PVCs, premature ventricular contractions. The normal pathway of the heart is from the atrium to the ventricles. The low potassium causes the heart to become irritated thus creating PVCs, irregular beats from the ventricle. The PVCs can override the normal or regular beats of the heart leading to ventricular tachycardia or ventricular fibulation. At this point the heart is basically quivering and usually breathing has stopped. This is when a person is schocked in a code situation.