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Pathophysiology of neurally-mediated syncope.

C Malamud-Kessler1, E Bruno1, E Chiquete2

  • 1Departamento de Neurología y Psiquiatría, Laboratorio de Neurofisiología Clínica, Instituto Nacional de Ciencias Médicas y Nutrición «Salvador Zubirán», México, D.F.

Neurologia (Barcelona, Spain)
|May 22, 2014
PubMed
Summary

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Neurally-mediated syncope (NMS) involves a sudden drop in blood pressure (BP) and heart rate (HR). This study explores the baroreflex (BR) role in NMS, revealing sympathetic hyperactivity and impaired BP regulation.

Area of Science:

  • Cardiovascular Physiology
  • Autonomic Nervous System Function
  • Syncope Pathophysiology

Background:

  • Neurally-mediated syncope (NMS) is characterized by transient loss of consciousness.
  • This is caused by an abrupt, intermittent drop in blood pressure (BP).

Purpose of the Study:

  • To describe the pathophysiological mechanisms of NMS.
  • To elucidate the role of the baroreflex (BR) in NMS.
  • To examine the interaction of heart rate (HR) and BP in NMS.

Main Methods:

  • Analysis of baroreflex-mediated control of hemodynamic variables (HR and BP).
  • Evaluation of responses during active standing and passive tilting.
  • Assessment of sympathetic activity and its impact on BP regulation.
Keywords:
Active StandingBaroreflexBarorreflejoNeurally-mediated syncopeOrtostatismo activoPrueba de inclinaciónSíncope neuralmente mediadoTilt test

Related Experiment Videos

Main Results:

  • Patients with NMS exhibit sympathetic hyperactivity at rest.
  • Excessive tachycardia can precede bradycardia and profound hypotension during orthostatic stress.
  • Recovery of systolic BP is often delayed or incomplete.

Conclusions:

  • Baroreflex dysfunction plays a critical role in NMS.
  • Sympathetic hyperactivity and impaired hemodynamic responses contribute to syncope.
  • Abnormalities in BR control lead to significant BP drops and delayed recovery.