Splanchnic hyperemia and hypervolemia during Valsalva maneuver in postural tachycardia syndrome
نویسندگان
چکیده
منابع مشابه
Splanchnic hyperemia and hypervolemia during Valsalva maneuver in postural tachycardia syndrome.
Prior work demonstrated dependence of the change in blood pressure during the Valsalva maneuver (VM) on the extent of thoracic hypovolemia and splanchnic hypervolemia. Thoracic hypovolemia and splanchnic hypervolemia characterize certain patients with postural tachycardia syndrome (POTS) during orthostatic stress. These patients also experience abnormal phase II hypotension and phase IV hyperte...
متن کاملPersistent splanchnic hyperemia during upright tilt in postural tachycardia syndrome.
Previous investigations have allowed for stratification of patients with postural tachycardia syndrome (POTS) on the basis of peripheral blood flow. One such subset, comprising "normal-flow POTS" patients, is characterized by normal peripheral resistance and blood volume in the supine position but thoracic hypovolemia and splanchnic blood pooling in the upright position. We studied 32 consecuti...
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Models of microgravity are linked to excessive constitutive nitric oxide (NO) synthase (NOS), splanchnic vasodilation, and orthostatic intolerance. Normal-flow postural tachycardia syndrome (POTS) is a form of chronic orthostatic intolerance associated with splanchnic hyperemia. To test the hypothesis that there is excessive constitutive NOS in POTS, we determined whether cutaneous microvascula...
متن کاملReciprocal splanchnic-thoracic blood volume changes during the Valsalva maneuver.
The Valsalva maneuver is frequently used to test autonomic function. Previous work demonstrated that the blood pressure decrease during the Valsalva maneuver relates to thoracic hypovolemia, which may preclude pressure recovery during phase II, even with normal resting peripheral vasoconstriction. We hypothesized that increased regional blood volume, specifically splanchnic hypervolemia, accoun...
متن کاملRelation of postural vasovagal syncope to splanchnic hypervolemia in adolescents.
BACKGROUND The mechanisms of simple faint remain elusive. We propose that postural fainting is related to excessive thoracic hypovolemia and splanchnic hypervolemia during orthostasis compared with healthy subjects. METHODS AND RESULTS We studied 34 patients 12 to 22 years old referred for multiple episodes of postural faint and 11 healthy subjects. Subjects were studied in the supine positio...
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ژورنال
عنوان ژورنال: American Journal of Physiology-Heart and Circulatory Physiology
سال: 2005
ISSN: 0363-6135,1522-1539
DOI: 10.1152/ajpheart.00194.2005