Cardiac vagal activity
نویسندگان
چکیده
منابع مشابه
Cardiac vagal activity and daily clinical practice
During most of the day heart rate (HR) is dominated by cardiac vagal (parasympathetic) activity – a fact taught in physiology classes and duly repeated at the appropriate exams. Only later in medical practice does one become aware of the power of cardiac vagal innervation, mainly in extreme cases: when it leads to syncope by too much or to tachycardia by too little activity, as in severe diabet...
متن کاملActivity patterns of cardiac vagal motoneurons in rat nucleus ambiguus.
Extracellular recordings were made in the right nucleus ambiguus of urethane-anesthetized rats from 33 neurons that were activated at constant latency from the craniovagal cardiac branch. Their calculated conduction velocities were in the B-fiber range (1.6-13.8 m/s, median 4.2), and most (22/33) were silent. Active units were confirmed as cardiac vagal motoneurons (CVM) by the collision test f...
متن کاملRespiratory sinus arrhythmia, cardiac vagal control, and daily activity.
Ambulatory respiratory sinus arrhythmia (RSA) or high-frequency heart rate (HR) variability is frequently employed as an index of cardiac parasympathetic control and related to risk or severity of cardiovascular disease. However, laboratory studies indicate variations in physical activity and respiratory parameters of rate and tidal volume may confound estimation of vagal activity. Because litt...
متن کاملThoracoscopic sympathectomy increases efferent cardiac vagal activity and baroreceptor sensitivity.
OBJECTIVES Thoracoscopic sympathectomy at levels T2 or T2-T3 is a treatment for focal hyperhidrosis and facial blushing. These levels of the sympathetic trunk innervate the heart, and consequently, the procedure is reported to change the heart rate variability due to changes in efferent cardiac autonomic activity. Our objective was to investigate the effects of thoracoscopic sympathectomy on gl...
متن کاملActivation of Cardiac Vagal Afferents
Myocardial ischemia and reperfusion can evoke excitation of cardiac vagal nerve endings and activation of a cardiogenic depressor reflex (Bezold-Jarisch effect). We postulate that oxygen-derived free radicals, which are known to be produced during prolonged ischemia and reperfusion, contribute to this afferent excitation. We recorded activity from 47 chemosensitive vagal afferent fibers in 31 r...
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ژورنال
عنوان ژورنال: Japanese Journal of Physiological Psychology and Psychophysiology
سال: 1996
ISSN: 0289-2405
DOI: 10.5674/jjppp1983.14.77