Progressive Withdrawal of Muscle Nerve Sympathetic Activity Preceding Vaso-Vagal Syncope during Lower-Body Negative Pressure

Abstract
We report the observation of a vaso-vagal syncope (VVS) occurring during lower body negative pressure in a young male volunteer. Recording of the peripheral blood flow, blood pressure and muscular sympathetic nerve activity revealed first a progressive withdrawal of muscle nerve sympathetic activity with redistribution of blood flow before the onset of the VVS.

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