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Related Experiment Videos

Diffuse and severe left ventricular dysfunction induced by epicardial coronary artery spasm.

K Sakata1, R Nawada, K Ohbayashi

  • 1Department of Cardiology, Shizuoka General Hospital, Japan.

Angiology
|December 7, 2000
PubMed
Summary

Epicardial coronary artery spasm can cause severe left ventricular dysfunction, mimicking dilated cardiomyopathy (DCM). Early identification via acetylcholine testing and treatment with antianginal drugs significantly improve cardiac function in these vasospastic angina patients.

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Area of Science:

  • Cardiology
  • Vascular Biology
  • Cardiac Imaging

Background:

  • Dilated cardiomyopathy (DCM) may involve coronary artery spasm.
  • Investigating epicardial coronary artery spasm as a cause of severe cardiac dysfunction.

Observation:

  • 34 patients with unexplained left ventricular hypokinesis underwent acetylcholine testing.
  • 9 patients (35%) diagnosed with DCM-like vasospastic angina (VSA) showed spasm.
  • DCM and DCM-like VSA groups had similar clinical and biopsy data.

Findings:

  • DCM-like VSA patients had acetylcholine-induced diffuse, multivessel coronary spasm.
  • Left ventricular end-systolic volume was greater in DCM than DCM-like VSA.
  • Both groups improved with treatment, but DCM-like VSA showed greater ejection fraction and fractional shortening increases.

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Implications:

  • Epicardial coronary artery spasm can induce DCM-like left ventricular dysfunction.
  • Acetylcholine testing is crucial for diagnosing DCM-like VSA.
  • Antianginal drugs significantly improve cardiac function in DCM-like VSA.