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Myocardial capillary supply is limited in hypertrophic cardiomyopathy: a morphological analysis

Bengt Johansson1, Stellan Mörner, Anders Waldenström

  • 1Department of Integrative Medical Biology, Anatomy, Umeå University, SE-90187 Umeå, Sweden. bengt.johansson@medicin.umu.se

International Journal of Cardiology
|May 29, 2007
PubMed

Insights

Hypertrophic cardiomyopathy (HCM) shows reduced capillary density and impaired coronary reserve due to capillary loss and defective growth. This morphological basis may explain myocardial ischemia and worse prognosis in HCM patients.

Area of Science:

  • Cardiovascular Pathology
  • Myocardial Biology
  • Clinical Cardiology

Background:

  • Hypertrophic cardiomyopathy (HCM) symptoms like chest pain and dyspnea may stem from myocardial ischemia.
  • Patients with HCM often experience these symptoms without significant coronary artery atherosclerosis.
  • While reduced myocardial perfusion is known in HCM, the specific changes in myocardial capillary morphology remain unclear.

Purpose of the Study:

  • To investigate the morphological underpinnings of limited coronary reserve in hypertrophic cardiomyopathy.
  • To elucidate the relationship between cardiomyocyte hypertrophy and myocardial capillary structure in HCM.

Main Methods:

  • Analysis of myectomy specimens from 5 HCM patients and 5 controls using immunohistochemistry and morphometry.
  • Quantitative assessment of capillaries and cardiomyocytes to evaluate capillary density and cardiomyocyte size.

Main Results:

  • HCM patients exhibited a significant reduction in capillaries per cardiomyocyte (p<0.009).
  • Capillary density was 33% lower in HCM hearts (p<0.05).
  • Evidence suggests actual loss of myocardial capillaries and defective capillary growth in HCM.

Conclusions:

  • Morphological findings indicate impaired capillary supply and reduced coronary reserve in HCM with moderate hypertrophy and outflow tract obstruction.
  • These capillary abnormalities may contribute to limited myocardial perfusion and a worse prognosis in HCM.
  • The study provides evidence for capillary loss and defective growth in the hypertrophic cardiomyopathy myocardium.
Abstract

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