Differentiating compensatory mechanisms associated with low tolerance to central hypovolemia in women
نویسندگان
چکیده
منابع مشابه
Variability in integration of mechanisms associated with high tolerance to progressive reductions in central blood volume: the compensatory reserve
High tolerance to progressive reductions in central blood volume has been associated with higher heart rate (HR), peripheral vascular resistance (PVR), sympathetic nerve activity (SNA), and vagally mediated cardiac baroreflex sensitivity (BRS). Using a database of 116 subjects classified as high tolerance to presyncopal-limited lower body negative pressure (LBNP), we tested the hypothesis that ...
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متن کاملResting sympathetic baroreflex sensitivity in subjects with low and high tolerance to central hypovolemia induced by lower body negative pressure
Central hypovolemia elicited by orthostasis or hemorrhage triggers sympathetically-mediated baroreflex responses to maintain organ perfusion; these reflexes are less sensitive in patients with orthostatic intolerance, and during conditions of severe blood loss, may result in cardiovascular collapse (decompensatory or circulatory shock). The ability to tolerate central hypovolemia is variable an...
متن کاملTolerance to central hypovolemia: the influence of oscillations in arterial pressure and cerebral blood velocity.
Higher oscillations of cerebral blood velocity and arterial pressure (AP) induced by breathing with inspiratory resistance are associated with delayed onset of symptoms and increased tolerance to central hypovolemia. We tested the hypothesis that subjects with high tolerance (HT) to central hypovolemia would display higher endogenous oscillations of cerebral blood velocity and AP at presyncope ...
متن کاملPlasma hyperosmolality improves tolerance to combined heat stress and central hypovolemia in humans.
Heat stress profoundly impairs tolerance to central hypovolemia in humans via a number of mechanisms including heat-induced hypovolemia. However, heat stress also elevates plasma osmolality; the effects of which on tolerance to central hypovolemia remain unknown. This study examined the effect of plasma hyperosmolality on tolerance to central hypovolemia in heat-stressed humans. With the use of...
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ژورنال
عنوان ژورنال: American Journal of Physiology-Heart and Circulatory Physiology
سال: 2019
ISSN: 0363-6135,1522-1539
DOI: 10.1152/ajpheart.00420.2018