1.   Ventricular failure, in which the heart twitches instead of beats, is the most common form of cardiac arrest and the most susceptible to treatment with a defibrillator.

2.   Ventricular failure was halted in all four passengers who developed it aboard an aircraft, and two survived.

3.   She suffered left ventricular failure, which constricts the flow of blood to the heart, doctors said Friday.

4.   The cardiac irregularity, the left ventricular failure, is still there.