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Cardiac and vascular sympathetic baroreflex control during orthostatic pre-syncope

dc.contributor.authorFurlan, Raffaello
dc.contributor.authorHeusser, Karsten
dc.contributor.authorMinonzio, Maura
dc.contributor.authorShiffer, Dana
dc.contributor.authorCairo, Beatrice
dc.contributor.authorTank, Jens
dc.contributor.authorJordan, Jens
dc.contributor.authorDiedrich, André
dc.contributor.authorGauger, Peter
dc.contributor.authorZamuner, Roberto A.
dc.contributor.authorDipaola, Franca
dc.contributor.authorPorta, Alberto
dc.contributor.authorBarbic, Franca
dc.date.accessioned2023-03-14T18:21:28Z
dc.date.available2023-03-14T18:21:28Z
dc.date.issued2019
dc.identifier.urihttp://repositorio.ucm.cl/handle/ucm/4503
dc.description.abstractWe hypothesized that sympathetic baroreflex mediated uncoupling between neural sympathetic discharge pattern and arterial pressure (AP) fluctuations at 0.1 Hz during baroreceptor unloading might promote orthostatic pre-syncope. Ten volunteers (32 ± 6 years) underwent electrocardiogram, beat-to-beat AP, respiratory activity and muscle sympathetic nerve activity (MSNA) recordings while supine (REST) and during 80° head-up tilt (HUT) followed by −10 mmHg stepwise increase of lower body negative pressure until pre-syncope. Cardiac and sympathetic baroreflex sensitivity were quantified. Spectrum analysis of systolic and diastolic AP (SAP and DAP) and calibrated MSNA (cMSNA) variability assessed the low frequency fluctuations (LF, ~0.1 Hz) of SAP, DAP and cMSNA variability. The squared coherence function (K2) quantified the coupling between cMSNA and DAP in the LF band. Analyses were performed while supine, during asymptomatic HUT (T1) and at pre-syncope onset (T2). During T2 we found that: (1) sympathetic baroreceptor modulation was virtually abolished compared to T1; (2) a progressive decrease in AP was accompanied by a persistent but chaotic sympathetic firing; (3) coupling between cMSNA and AP series at 0.1 Hz was reduced compared to T1. A negligible sympathetic baroreceptor modulation during pre-syncope might disrupt sympathetic discharge pattern impairing the capability of vessels to constrict and promote pre-syncope.es_CL
dc.language.isoenes_CL
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 Chile*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/*
dc.sourceJournal of Clinical Medicine, 8(9), 1434es_CL
dc.subjectSyncopees_CL
dc.subjectVasovagales_CL
dc.subjectBaroreceptorses_CL
dc.subjectMuscle sympathetic nerve activityes_CL
dc.subjectPower spectrum analysises_CL
dc.subjectHeart rate variabilityes_CL
dc.subjectBlood pressure variabilityes_CL
dc.subjectMSNA variabilityes_CL
dc.titleCardiac and vascular sympathetic baroreflex control during orthostatic pre-syncopees_CL
dc.typeArticlees_CL
dc.ucm.facultadFacultad de Ciencias de la Saludes_CL
dc.ucm.indexacionScopuses_CL
dc.ucm.indexacionIsies_CL
dc.ucm.doidoi.org/10.3390/jcm8091434es_CL


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