Which of the following events can lead to ventricular fibrillation?
a. A ventricular rate of ninety beats a minute
b. A premature ventricular beat that occurs during the T wave
c. The presence of saw tooth waves instead of P waves on an electrocardiogram
d. An increased width of the QRS complex
ANS: B
A ventricular rate of ninety beats a minute is within normal limits. A premature ventricular beat during the T wave would be immediately after the relative refractory period and could lead to ventricular tachycardia or ventricular fibrillation. Saw toothed waves instead of P waves indicate that atrial flutter is present. An increased width of the QRS is associated with any ventricular arrhythmia.
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