Cardiac-locked bursts of muscle sympathetic nerve activity are absent in familial dysautonomia
نویسندگان
چکیده
منابع مشابه
Spontaneous bursts of muscle sympathetic nerve activity decrease leg vascular conductance in resting humans.
Previous studies in humans attempting to assess sympathetic vascular transduction have related large reflex-mediated increases in muscle sympathetic nerve activity (MSNA) to associated changes in limb vascular resistance. However, such procedures do not provide insight into the ability of MSNA to dynamically control vascular tone on a beat-by-beat basis. Thus we examined the influence of sponta...
متن کاملSeasonal variation in muscle sympathetic nerve activity
Epidemiologic data suggest there are seasonal variations in the incidence of severe cardiac events with peak levels being evident in the winter. Whether autonomic indices including muscle sympathetic nerve activity (MSNA) vary with season remains unclear. In this report, we tested the hypothesis that resting MSNA varies with the seasons of the year with peak levels evident in the winter. We ana...
متن کاملInfluence of spontaneously occurring bursts of muscle sympathetic nerve activity on conduit artery diameter.
Large increases in muscle sympathetic nerve activity (MSNA) can decrease the diameter of a conduit artery even in the presence of elevated blood pressure, suggesting that MSNA acts to regulate conduit artery tone. Whether this influence can be extrapolated to spontaneously occurring MSNA bursts has not been examined. Therefore, we tested the hypothesis that MSNA bursts decrease conduit artery d...
متن کاملEffects of expiratory muscle work on muscle sympathetic nerve activity.
We hypothesized that contractions of the expiratory muscles carried out to the point of task failure would cause an increase in muscle sympathetic nerve activity (MSNA). We measured MSNA directly in six healthy men during resisted expiration (60% maximal expiratory pressure) leading to task failure with long [breathing frequency (f(b)) = 15 breaths/min; expiratory time (TE)/total respiratory cy...
متن کاملFamilial dysautonomia.
Familial dysautonomia is a rare syndrome of childhood affecting the nervous system. As the name suggests, dysfunction of the autonomic system is a prominent feature. It was first recognized as a separate entity by Riley, Day, Greeley and Langford (1949), the first large series being described by Riley (1952). So far, about 70 patients have been recorded. Though the fully developed syndrome is u...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 2013
ISSN: 0022-3751
DOI: 10.1113/jphysiol.2012.246264