title: 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.
authors.affiliation: Division of Hypertension, CHUV, Lausanne, Switzerland.
authors.forename: D
authors.initials: D
authors.lastname: Hayoz
authors.forename: G
authors.initials: G
authors.lastname: Noll
authors.forename: C
authors.initials: C
authors.lastname: Passino
authors.forename: R
authors.initials: R
authors.lastname: Weber
authors.forename: R
authors.initials: R
authors.lastname: Wenzel
authors.forename: L
authors.initials: L
authors.lastname: Bernardi
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D004562:Electrocardiography; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D017078:Laser-Doppler Flowmetry; D008150:Lower Body Negative Pressure; D008297:Male; D009132:Muscles / Q000294:innervation*; D010991:Plethysmography; D012039:Regional Blood Flow / Q000502:physiology; D012815:Signal Processing, Computer-Assisted; D013564:Sympathetic Nervous System / Q000503:physiopathology*; D013575:Syncope / Q000503:physiopathology*; D014630:Vagus Nerve / Q000503:physiopathology*