Search results for "Crosscorrelation"

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Mechanisms of causal interaction between short-term RR interval and systolic arterial pressure oscillations during orthostatic challenge

2013

The transition from the supine to the upright position requires a reorganization of the mechanisms of cardiovascular control that, if not properly accomplished, may lead to neurally mediated syncope. We investigated how the patterns of causality between systolic arterial pressure (SAP) and cardiac RR interval were modified by prolonged head-up tilt using a novel nonlinear approach based on corrected conditional entropy (CCE) compared with the standard approach exploiting the cross-correlation function (CCF). Measures of coupling strength and delay of the causal interactions from SAP to RR and from RR to SAP were obtained in 10 patients with recurrent, neurally mediated syncope (RNMS) and 10…

AdultMaleSupine positionAdolescentPhysiologyPostureBaroreflexCardiovascular SystemSyncopeCardiovascular Physiological PhenomenaElectrocardiographyYoung AdultTilt table testOrthostatic vital signsNeurally mediated syncopeTilt-Table TestPhysiology (medical)medicineAutonomic nervous systemHumansArterial PressureCardiovascular Physiological PhenomenaAgedmedicine.diagnostic_testbusiness.industryHead-up tiltCrosscorrelationHeartBaroreflexMiddle AgedAutonomic nervous systemBlood pressureCardiovascular controlCase-Control StudiesAnesthesiaSettore ING-INF/06 - Bioingegneria Elettronica E InformaticaFemaleConditional entropybusinessElectrocardiographyJournal of Applied Physiology
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