Ventricular fibrillation -LRB- V-fib or VF -RRB- is a condition in which there is uncoordinated contraction of the cardiac muscle of the ventricles in the heart , making them tremble rather than contract properly .

Ventricular fibrillation -LRB- often shortened to VF or V-Fib -RRB- is a cardiac arrhythmia in which there is an uncoordinated contraction of the cardiac muscle of the ventricles in the heart .
