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Related Experiment Videos

Plasma viscosity in ischemic heart disease.

J Fuchs, I Weinberger, Z Rotenberg

    American Heart Journal
    |September 1, 1984
    PubMed
    Summary

    Elevated plasma viscosity is linked to severe unstable angina, potentially impacting myocardial oxygen delivery. This finding suggests a role for plasma viscosity in the pathophysiology of ischemic heart disease.

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    Area of Science:

    • Cardiology
    • Hematology
    • Biophysics

    Background:

    • Ischemic heart disease (IHD) encompasses conditions like unstable angina and myocardial infarction.
    • Understanding factors affecting myocardial oxygen delivery is crucial for IHD management.
    • Plasma viscosity, a measure of blood's resistance to flow, may influence cardiovascular health.

    Purpose of the Study:

    • To investigate plasma viscosity levels in patients with various forms of ischemic heart disease.
    • To compare plasma viscosity in patients with unstable angina, acute myocardial infarction, and stable angina to healthy controls.
    • To explore the relationship between plasma viscosity and exercise-induced myocardial ischemia.

    Main Methods:

    • Plasma viscosity was measured using the capillary method.

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  • 108 patients with ischemic heart disease were studied, categorized by disease severity.
  • Plasma viscosity was also assessed in 30 IHD patients during exercise-induced ischemia and compared to 100 normal subjects.

    • Main Results:

    • The highest plasma viscosity was observed in severe unstable angina patients (1.66 +/- 0.068).
    • Patients with acute myocardial infarction (1.53 +/- 0.10) and less severe unstable angina (1.61 +/- 0.056) showed significantly lower viscosity than severe unstable angina.
    • Stable angina patients (1.42 +/- 0.089) had viscosity similar to normal subjects; no increase was noted during exercise-induced ischemia.

    Conclusions:

    • Elevated plasma viscosity is associated with severe unstable angina.
    • Increased plasma viscosity may compromise myocardial oxygen delivery and coronary blood flow.
    • Plasma viscosity could be a contributing factor in the pathophysiology of unstable angina.