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Related Experiment Videos

Why does vasodilatation occur during syncope?

B J Robinson1, R H Johnson

  • 1Neurological Research Group, Wellington School of Medicine, Wellington Hospital, New Zealand.

Clinical Science (London, England : 1979)
|April 1, 1988
PubMed
Summary
This summary is machine-generated.

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Fainting episodes during blood draws are linked to a drop in heart rate and blood pressure. Increased adrenaline levels may cause these syncopal events by widening blood vessels.

Area of Science:

  • Cardiology
  • Physiology
  • Endocrinology

Background:

  • Orthostatic stress, such as standing or tilting, can precipitate syncopal episodes.
  • Blood sampling procedures can induce physiological stress in subjects.

Purpose of the Study:

  • To investigate the physiological changes preceding and during syncopal episodes.
  • To determine the role of neurochemicals in the development of syncope.

Main Methods:

  • Observational study involving five subjects experiencing syncopal episodes.
  • Monitoring of heart rate, blood pressure, and plasma concentrations of adrenaline, noradrenaline, and vasopressin.

Main Results:

  • All subjects exhibited bradycardia and hypotension before syncope.

Related Experiment Videos

  • Plasma adrenaline concentrations increased in all subjects prior to syncope.
  • Plasma vasopressin increased in all subjects, while noradrenaline levels varied.

    • Conclusions:

    • Elevated plasma adrenaline may contribute to vasodilation and hypotension during syncope.
    • The study highlights the complex hormonal and cardiovascular responses during syncopal episodes.