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Detection of the "midband" lipoprotein in patients with coronary artery spasm

K Miwa1, K Nakagawa, K Suzuki

  • 1The Second Department of Internal Medicine, Toyama Medical and Pharmaceutical University, Japan.

Clinical Cardiology
|April 6, 2001
PubMed

Insights

Dyslipidemia in coronary vasospasm patients is linked to abnormal triglyceride-rich lipoprotein metabolism. A specific "midband" lipoprotein was frequently found in these patients, suggesting a role in coronary artery spasm development.

Area of Science:

  • Cardiology
  • Lipid Metabolism
  • Clinical Biochemistry

Background:

  • Coronary vasospasm is associated with low high-density lipoprotein (HDL) cholesterol and normal low-density lipoprotein (LDL) cholesterol, differing from organic coronary artery disease.
  • Disordered triglyceride-rich lipoprotein metabolism is hypothesized to contribute to coronary artery spasm.

Purpose of the Study:

  • To investigate the association between a specific "midband" lipoprotein and coronary artery spasm.
  • To explore the role of triglyceride-rich lipoprotein metabolism in the pathogenesis of coronary vasospasm.

Main Methods:

  • Polyacrylamide disc gel electrophoresis was used to detect "midband" lipoprotein in patients with coronary spastic angina (CSA), stable effort angina (SEA), and controls.
  • Serum lipid and apoprotein levels, smoking prevalence, and glucose metabolism were analyzed in relation to midband lipoprotein presence.

Main Results:

  • The midband lipoprotein was significantly more prevalent in CSA (71%) compared to SEA (50%) and controls (25%).
  • CSA patients with midband lipoprotein showed a higher incidence of diabetes/impaired glucose tolerance and lower HDL cholesterol.
  • Midband lipoprotein detection decreased significantly after an angina-free period in CSA patients.

Conclusions:

  • The frequent detection of midband lipoprotein in CSA suggests its potential role in coronary vasospasm.
  • Dyslipidemia characterized by disordered triglyceride-rich lipoprotein metabolism may be implicated in the genesis of coronary artery spasm.
Abstract

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