How does a constrictor know when to let go?

[knox]

Originally Posted by RandyRhoads

Which would eventually cause myocardial ischemia resulting in the firing of all internal pacemakers causing V Fib, correct?

I would say no... The escape rate of the AV node and Ventricles is not equal to the action potential of the myocardial cells.

VF doesn't occur from lack of heart beats, it occurs from electrical anomalies in the cells. However, those with former MIs are definitely at a higher risk for VT and VF due to the damage done to the myocardium. Whether it would be that rapid with constriction is doubtful.