Ventricular fibrillation (V fib) is described as:

• A. Life-threatening condition of ventricular twitching that causes ineffective pumping action, stopping blood circulation.
• B. A rapid rhythm of the ventricles that originates in the atria.
• C. A normal rhythm during exercise.
• D. An occasional small upward curve after the PQRST.

Answer: (A)

Ventricular fibrillation is a life-threatening arrhythmia in which the ventricles quiver with rapid, chaotic electrical activity instead of contracting in a coordinated way. Because the ventricles aren’t contracting effectively, there is no meaningful blood pumping, leading to a loss of circulation. This description aligns with the statement that it is a life-threatening condition of ventricular twitching causing ineffective pumping action and stopping blood circulation.

The other descriptions do not fit V fib. It is not a rapid rhythm that originates in the atria (that would describe an atrial issue, not ventricles). It is not a normal rhythm seen during exercise (V fib is not normal at all). And it does not present as a small upward curve after the PQRST; V fib shows chaotic, irregular activity rather than a recognizable waveform.