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Circulating endothelin-1 in obstructive sleep apnea

S Saarelainen1, E Seppälä, K Laasonen

  • 1Department of Pulmonary Diseases, Tampere University Hospital, Pikonlinna, Finland.

Endothelium : Journal of Endothelial Cell Research
|January 1, 1997
PubMed
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Endothelin-1 levels were elevated in men with obstructive sleep apnea, regardless of blood pressure. Continuous positive airway pressure treatment did not reduce these peptide levels.

Area of Science:

  • Cardiovascular Physiology
  • Sleep Medicine
  • Endocrinology

Background:

  • Endothelin (ET)-1 is a peptide with significant vasoconstrictive and mitogenic properties.
  • Endothelial cells produce ET-1, with primary degradation occurring in the pulmonary vasculature.
  • Elevated ET-1 is implicated in various cardiovascular conditions.

Purpose of the Study:

  • To investigate Endothelin-1 levels in men diagnosed with obstructive sleep apnea (OSA).
  • To compare ET-1 levels between normotensive and hypertensive OSA patients.
  • To assess the impact of continuous positive airway pressure (CPAP) treatment on ET-1 levels in OSA patients.

Main Methods:

  • Plasma Endothelin-1 concentrations were measured using immunoassays.
  • Participants included normotensive OSA patients, hypertensive OSA patients, and healthy controls.

Related Experiment Videos

  • Ten OSA patients were reassessed after three months of nCPAP therapy.
  • Main Results:

    • Endothelin-1 levels were significantly higher in both normotensive (6.3 +/- 2.8 pg/ml) and hypertensive (7.8 +/- 3.0 pg/ml) OSA groups compared to healthy controls (2.9 +/- 1.2 pg/ml).
    • No statistically significant difference was observed between normotensive and hypertensive OSA groups.
    • Following three months of nCPAP treatment, no significant reduction in Endothelin-1 levels was detected in the studied patients.

    Conclusions:

    • Obstructive sleep apnea is associated with elevated circulating Endothelin-1 levels.
    • Continuous positive airway pressure therapy may not effectively decrease Endothelin-1 in OSA patients.
    • Further research is warranted to explore the role of ET-1 in OSA pathophysiology and potential therapeutic targets.