On inspection of a patient's ECG strip, you note no identifiable P waves; rapid irregular undulations of the isoelectric line; and an irregular ventricular rhythm. In addition, the precordial cardiac rate is greater than the peripheral pulse rate. The most likely problem is:

A. 2nd degree (Wenckebach) heart block
B. ventricular fibrillation
C. atrial fibrillation
D. ventricular tachycardia

Answer: C. atrial fibrillation

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