منابع مشابه
Spinal sympathetic cardiocardiac reflexes.
We studied the reflex changes in myocardial contractility elicited by electrical stimulation of afferent cardiac sympathetic nerve fibers or chemical stimulation of their cardiac endings. Veratridine injected directly into the left coronary artery was the chemical stimulus. The maximum rate of rise of left ventricular pressure, dP/dt max, was used as an index of myocardial contractility. The st...
متن کاملThe cardiocardiac sympathetic reflex during coronary occlusion in anesthetized dogs.
Cardiac sympathetic afferent fibers activated during coronary occlusion exert an excitatory influence on sympathetic discharge to the heart in cats after spinal cord section. The significance of this cardiocardiac sympathetic reflex response during myocardial ischemia in animals with an intact neuraxis is unknown. We studied the responses of efferent cardiac sympathetic nerve activity (CSNA), a...
متن کاملSpinal sympathetic reflexes in the cat and the pathogenesis of arterial hypertension.
1. In vagotomized anaesthetized cats with both common carotid arteries occluded, stretch of the thoracic aorta induced reflex increases in arterial blood pressure, heart rate and left ventricular dP/dtmax. Similar responses were obtained in cats with spinal transection at the level of the first cervical nerve roots. 2. The hypothesis is advanced that sympathetic excitatory reflexes may contribu...
متن کاملRecurrent Facilitation of Spinal Reflexes
Antidromic volleys in muscle nerves may facilitate monosynaptic reflexes originating from neighboring motoneurons. This facilitation has been studied in spinal cats. It is at its peak with a conditioning-test interval of 20 to 30 msec., and can last 50 to 100 msec. The threshold of facilitation is about the same as that of recurrent inhibition. Both phenomena appear to be activated by stimulati...
متن کاملNeurophysiological studies SPINAL CORD AND BRAINSTEM REFLEXES
It took decades to accept that dystonia, a bizarre condition which often produces abnormal movements exclusively during specific activities like writing, was due to brain disease. Clinical neurophysiology certainly added to this evolution of thinking. Recent neurophysiological observations demonstrate that dystonia is not only due to an isolated brain motor dysfunction, but also to sensory and ...
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ژورنال
عنوان ژورنال: Circulation Research
سال: 1972
ISSN: 0009-7330,1524-4571
DOI: 10.1161/01.res.30.2.158