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[Changes in plasma endothelin during coronary spasm]

J Y Artigou1, J Salloum, A Carayon

  • 1Service de cardiologie, Hôpital Pitié-Salpêtrière, Paris.

Archives Des Maladies Du Coeur Et Des Vaisseaux
|November 1, 1993
PubMed
Summary
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Plasma endothelin levels were significantly higher in patients experiencing coronary spasm, particularly in the morning. These elevated endothelin levels were observed under basal conditions and during spasm in individuals with spastic angina.

Area of Science:

  • Cardiovascular Physiology
  • Endocrinology

Background:

  • Endothelin is a potent vasoconstrictor implicated in cardiovascular regulation.
  • Coronary spasm, a sudden constriction of coronary arteries, can lead to angina.
  • Understanding the role of endothelin in coronary spasm is crucial for managing ischemic heart conditions.

Purpose of the Study:

  • To investigate the association between plasma endothelin levels and the occurrence of coronary spasm.
  • To compare endothelin levels in patients with and without coronary spasm.
  • To explore the time-dependent variation of endothelin levels in relation to coronary spasm.

Main Methods:

  • A methylergonovine stress test was administered to patients with normal coronary angiography.
  • Patients were divided into two groups: those who developed spasm (Group I) and those who did not (Group II).

Related Experiment Videos

  • Plasma endothelin levels were measured at multiple time points throughout the day, including during induced spasm in Group I.

    • Main Results:

    • Plasma endothelin levels were significantly higher in patients with coronary spasm (Group I) compared to those without (Group II), except during the spasm event itself.
    • Both groups exhibited a time-dependent variation in endothelin levels, with higher concentrations observed in the morning.
    • Patients in Group I demonstrated elevated basal endothelin levels and higher levels during spasm, indicating a strong link to spastic angina.

    Conclusions:

    • Elevated plasma endothelin levels are associated with coronary spasm.
    • Endothelin may play a significant role in the pathophysiology of spastic angina.
    • Morning circadian rhythms influence endothelin levels, potentially exacerbating vasospastic events.