Fig. 6

Cholinergic and nitrergic contributions to cardioversion. EKG and BP tracings from a rat infused with L-NAME 27 mg/kg that underwent VF and VNS defibrillation after cardiac over-pacing are shown in (a). In a different rat infused with L-NAME 27 mg/kg and atropine 5 mg/kg, VNS defibrillation was ineffective (b). In both examples, cardiac over-pacing was performed by stimulating the ventricles with 4-mA, 4-ms pulses at 50 Hz. Defibrillation was accomplished by stimulating the left vagus with 4-mA, 1-ms pulses at 50 Hz