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- W2022050836 abstract "The effects of increased and decreased cardiac sympathetic tone and coronary occlusion on ventricular fibrillation were determined in 14 open chest dogs anesthetized with sodium pentobarbital. Heart rate was kept constant by pacing the right atrium at cycle lengths of 500 msec. Ventricular fibrillation threshold was measured by delivering 350 msec trains of constant current stimuli with a frequency of 100 hertz and 2 msec duration. The minimal current of the train that induced fibrillation was taken as the ventricular fibrillation threshold. In seven animals, the effects of stellate stimulation were studied. Ventricular fibrillation threshold was measured during control periods, after 2 minutes of cornoary occlusion, after 2 minutes of stellate stimulation and after 2 minutes of stellate stimulation and coronary occlusion. Coronary occlusion alone decreased ventricular fibrillation threshold an average of 35 percent of control valvues and stellate stimulation alone decreased the threshold an average of 42 percent of control values. The combination of both these interventions decreased ventricular fibrillation threshold an average of 63 percent of control values. The effects of stellate ablation were studied in seven animals. Ventricular fibrillation threshold was measured during control periods, and during coronary occlusion before and after stellate ganglionectomy. Stellectomy increased the threshold an average of 31 percent above control values. After stellectomy, coronary occlusion decreased ventricular fibrillation threshold by only 11 percent of control values, a value 26 percent higher than the threshold during coronary occlusion before stellectomy. These findings may have therapeutic implications for the management of arrhythmias in patients with acute myocardial infarction or some forms of central nervous system disease." @default.
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- W2022050836 title "Influence of sympathetic tone on ventricular fibrillation threshold during experimental coronary occlusion" @default.
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- W2022050836 doi "https://doi.org/10.1016/0002-9149(75)90866-8" @default.
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