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• W148917859 abstract "In the pathophysiological study of vasovagal syncope, the nature of the interaction between baroreceptor sensitivity (BS), sympathetic withdrawal, and parasympathetic activity has yet to be ascertained. Altered BS may predispose toward abnormal sympathetic and parasympathetic responses to orthostasis, causing hypotension that may progress to syncope if there is sympathetic withdrawal. To examine this hypothesis, we monitored blood pressure (BP), heart rate (HR), BS, forearm blood flow, and muscle nerve sympathetic activity (MNSA) continuously in 18 vasovagal patients during 60° head-up tilt, syncope, and recovery. Results were compared with those of 17 patients who were able to tolerate tilt for 45 min. During early tilt, BP was maintained in both groups by an increase in HR and MNSA from baseline ( P < 0.01), but BS decreased more in the syncopal group ( P < 0.05). At the start of presyncope (mean 2.7 ± 0.2 min before syncope and 15.2 ± 12 min after tilt), when BP fell, HR and sympathetic activity remained increased from baseline ( P< 0.01). Thereafter, BP and HR correlated directly with sympathetic activity and regressed in linear fashion until syncope ( P < 0.001), whereas BS increased to baseline. At syncope, BP, HR, and sympathetic activity fell below baseline ( P < 0.01, P < 0.05, and P < 0.01, respectively), but BS did not increase. During recovery, sympathetic activity increased to baseline and BS increased ( P < 0.05), whereas HR and BP remained low ( P < 0.01 and P < 0.05, respectively). The mechanism for the initiation of hypotension during presyncope remains unknown, but BS may contribute. Vasodilatation and bradycardia during presyncope appear to be more closely related to withdrawal of sympathetic activity than to increased parasympathetic cardiac activity." @default.
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• W148917859 date "1998-06-01" @default.
• W148917859 modified "2023-10-16" @default.
• W148917859 title "Autonomic control of vasovagal syncope" @default.
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• W148917859 doi "https://doi.org/10.1152/ajpheart.1998.274.6.h2110" @default.
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