Role of sinoaortic reflexes in hemodynamic patterns of natural defense behaviors in the cat
| Autor: | Alberto Zanchetti, R. Albertini, G. Baccelli, A. Del Bo, Mancia G |
|---|---|
| Rok vydání: | 1981 |
| Předmět: |
Cardiac output
Physiology Hemodynamics Blood Pressure Pressoreceptors Vasodilation Heart Rate Physiology (medical) Reflex Heart rate medicine Animals Humans Cardiac Output Aorta business.industry Muscles Carotid sinus Denervation Aggression Carotid Sinus Blood pressure medicine.anatomical_structure Regional Blood Flow Anesthesia Cats medicine.symptom Cardiology and Cardiovascular Medicine business Agonistic Behavior Vasoconstriction |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 1522-1539 0363-6135 |
| DOI: | 10.1152/ajpheart.1981.240.3.h421 |
| Popis: | To evaluate whether sinoaortic afferents contribute to the hemodynamic pattern of fighting, cardiovascular changes associated with fighting were studied in cats before and after sinoaortic denervation. Sinoaortic denervation exaggerates the decrease in heart rate, cardiac output, and arterial pressure during immobile confrontation (hissing, staring but no movement). During nonsupportive fighting (fighting with forelimbs while lying on one side) and supportive fighting ( fighting while standing on four feet) sinoaortic denervation reduces the increase in heart rate and cardiac output, minimizes the mesenteric vasoconstriction, induces a fall in arterial blood pressure, but does not affect iliac vasoconstriction or vasodilatation. The hemodynamic pattern of fighting is similarly changed by temporary inactivation of carotid sinus baroreflexes by common carotid occlusion as by chronic section of sinoaortic nerves. It is concluded that sinoaortic reflexes play an important role in the cardiovascular patterns accompanying natural fighting. They favor cardiac action and allow a marked visceral vasoconstriction to occur, thus minimizing or preventing a fall in blood pressure during emotional behavior. |
| Databáze: | OpenAIRE |
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