Atrioventricular pressures and their relationships during stellate stimulation.
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چکیده
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منابع مشابه
Sympathetic and periodic vagal influences on antegrade and retrograde conduction through the canine atrioventricular node.
Concurrent stimulation of the parasympathetic and sympathetic branches of the autonomic nervous system causes a diminished sympathetic response at high levels of vagal activity. This "accentuated antagonism" has been demonstrated for cardiac chronotropic, inotropic, and dromotropic responses. The effect on conduction was demonstrated with tonic stimulation of the vagus nerve. However, normally ...
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Stellate ganglion stimulation in the anesthetized, open-chest dog consistently resulted in the generation of pressure differences which averaged 20 mm Hg across the infundibular region of the right ventricle. Before stimulation, peak systolic pressures in the sinus and conus were closely matched. Peak sinus pressure showed ah average increase of 184 and 162% during stimulation of the left and r...
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We examined the effects of stellate ganglia stimulation on the phase-dependent chronotropic and dromotropic responses to brief vagal bursts in open-chest anesthetized dogs. Stellate stimulation affected the phasic vagal effects on heart rate by shortening the latent period, shifting the phase at which maximum decrease in heart rate occurred to earlier phases, and reducing the maximum decrease i...
متن کاملInfluence of brief vagal and stellate nerve stimulation on pacemaker activity and conduction within the atrioventricular conduction system of the dog.
Experiments were performed on open-chest anesthetized dogs to determine the quantitative effects of autonomic nerve stimulition or pacemaker activity and conduction. The lead II electrocardiogram together with bipolar electrograms were recorded from the atria, the His bundles, and the ventricles. The vagi or the stellate gangba were stimulated in dogs which exhibited either sinus rhythm, ectopi...
متن کاملAtriogenic mitral valve reflux: diastolic mitral incompetence following isolated atrial systoles.
Cardiac and aortic pressures were recorded after stellate gangliooectomy and vagotomy. Acute heart block was produced by injecting the atrioventricular node, and atrial and ventricular systoles were controlled electronically to occur independently or in any desired relationship. Angiocardiograms recorded on video tape after injections of 4 ml 69% Renovist into the left ventricle were analyzed w...
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ورودعنوان ژورنال:
- The American journal of physiology
دوره 201 شماره
صفحات -
تاریخ انتشار 1961