Journal ArticleDOI
Circulatory effects of interruption and stimulation of cardiac vagal afferents.
B. ÖBerg,Saxon William White +1 more
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TLDR
The influence of the rhythmic activity in cardiac vagal afferents on the circulation was analyzed in chloralose-anesthetized cats by observing the cardiovascular responses to sudden interruption of this activity and to afferent stimulation of the cardiac nerves.Abstract:
The influence of the rhythmic activity in cardiac vagal afferents on the circulation was analyzed in chloralose-anesthetized cats by observing the cardiovascular responses to sudden interruption of this activity and to afferent stimulation of the cardiac nerves. The evoked responses were compared with those produced by “unloading” and stimulation of arterial baroreceptors. — Elimination of the impulse traffic in vagal afferents produced a blood pressure rise, a tachycardia and vasoconstrictions in skeletal muscle, intestine and kidney, indicating a tonic restraint of these afferents on the medullary vasomotor centre. The responses were generally moderate in the presence of normally functioning arterial baroreceptors but were pronounced after elimination of “buffering” influences from these receptors. — Comparisons of the inhibitory influences from vagal cardiac afferents and baroreceptor afferents, respectively, on the vasomotor centre indicated that the former were preferentially directed to neurons controlling the efferent discharge to the heart and the renal vessels. There was no evidence for a particularly strong engagement of the capacitance vessels in reflex patterns mediated through cardiac afferents. — Low frequency afferent stimulation of the cardiac nerves generally induced a profound brady-cardia, which was probably due to stimulation of fibres not normally tonically active.read more
Citations
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Neural and psychologic mechanisms and the problem of sudden cardiac death
TL;DR: Environmental stresses of diverse types can injure the heart, lower the threshold of cardiac vulnerability to ventricular fibrillation and, in the animal with coronary occlusion, provoke potentially malignant ventricular arrhythmias.
OtherDOI
Arterial Baroreflexes in Humans
Giuseppe Mancia,Allyn L. Mark +1 more
TL;DR: The sections in this article are: Carotid Sinus Massage, Arterial Baroreceptor Control of Heart Rate, and Modification of Arteria Baroreflexes by Drugs.
Journal ArticleDOI
Clinical relevance of the Bezold-Jarisch reflex.
TL;DR: The physiology of the Bezold–Jarisch reflex and its possible physiologic role in a number of clinical situations are focused on and discussion of the limited relevance of this reflex in regional anesthesia is provided.
OtherDOI
Integration of Cardiovascular Control Systems in Dynamic Exercise
TL;DR: The sections in this article are: Intrinsic Properties of the Cardiovascular System: How They Permit the Rise in Cardiac Output, and Control of the Circulation During Exercise and Heat Stress: Competing Reflexes.
References
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Journal ArticleDOI
Reflex Effects of Left Ventricular Distention
TL;DR: In open-chest dogs, the peripheral circulation was carried on a heart-lung machine and distention of the left ventricle caused reflex dilation of systemic veins and is considered likely that these reflex effects of left ventricular distention contribute to the mechanism of cardiogenic shock.
Journal ArticleDOI
The influence of intracardiac baroreceptors on venous return, systemic vascular volume and peripheral resistance.
TL;DR: Investigations were undertaken to determine whether or not these hemodynamic parameters are also modified by activation of intracardiac baroreceptors, and to localize these receptors within the heart.
Journal ArticleDOI
Shrinkage of the Heart in Anesthetized, Thoracotomized Dogs
TL;DR: Evidence is presented that the area of the cardiac silhouette and the area and diameter of the left ventricle all diminish in response to thoracotomy and during recovery return toward the pre-operative dimensions.
Journal ArticleDOI
Über sensible Impulse im Herznerven
A. Amann,H. Schaefer +1 more
TL;DR: In this article, Goormaghtigh and Pannier describe the sensiblen Impulse aus peripheren Gefiiggebieten, wie dem Carotissinus and dem Endgebiets des Depressor, bearbeitet worden and sowohl indirekt in ihrem Reflexerfolg wie direkt Ms Aktionsstrom der betreffenden abffihrenden Nerven dargestellt.
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