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Increased vasoconstrictor sensitivity in obstructive sleep apnea.

H Kraiczi1, J Hedner, Y Peker

  • 1Department of Clinical Pharmacology, Sahlgrenska University Hospital, Gothenburg, Sweden.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 5, 2000
PubMed
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Patients with obstructive sleep apnea (OSA) show increased vasoconstrictor sensitivity in forearm blood vessels. However, their response to acetylcholine was not significantly altered compared to healthy individuals.

Area of Science:

  • Cardiovascular Physiology
  • Sleep Medicine

Background:

  • Obstructive sleep apnea (OSA) is linked to cardiovascular complications.
  • Understanding vascular dysfunction in OSA is crucial for risk assessment.

Purpose of the Study:

  • To investigate vasoconstrictor sensitivity and cholinergic responsiveness in the forearm vasculature of male patients with OSA.
  • To determine if vascular alterations in OSA are independent of common cardiovascular risk factors.

Main Methods:

  • Compared 10 male OSA patients with 10 healthy controls, excluding those with regular medication or known cardiovascular risk factors.
  • Infused angiotensin II and acetylcholine into the brachial artery to assess forearm vascular conductance.
  • Measured forearm vascular conductance using venous occlusion plethysmography and intra-arterial blood pressure.

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Main Results:

  • OSA patients exhibited a significantly lower forearm vascular conductance during angiotensin II infusion (39.6% reduction, P = 0.002).
  • No significant difference in vascular responsiveness to acetylcholine was observed between OSA patients and controls.
  • Baseline characteristics including age, BMI, blood pressure, and lipids were similar between groups.

Conclusions:

  • Forearm vasculature in OSA patients demonstrates enhanced vasoconstrictor sensitivity.
  • Endothelial function, as assessed by cholinergic responsiveness, does not appear to be impaired in OSA independently of other risk factors.
  • Findings suggest specific alterations in vascular tone regulation in OSA.