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Myocardial blood flow and fibrosis in hypertrophic cardiomyopathy

Giovanni Donato Aquaro1, Giancarlo Todiere, Andrea Barison

  • 1Fondazione G. Monasterio CNR-Regione Toscana, Pisa, Italy. aquaro@ifc.cnr.it

Journal of Cardiac Failure
|May 10, 2011
PubMed

Insights

In hypertrophic cardiomyopathy (HCM), reduced myocardial blood flow (MBF) is linked to fibrosis and predicts worse clinical status. This finding highlights MBF as a key indicator in HCM patient outcomes.

Area of Science:

  • Cardiology
  • Cardiovascular Imaging
  • Biomedical Engineering

Background:

  • Hypertrophic cardiomyopathy (HCM) is a complex condition affecting heart muscle structure and function.
  • Understanding the interplay between myocardial blood flow (MBF), fibrosis, and clinical outcomes is crucial for managing HCM.
  • Risk factors for sudden death and clinical manifestations in HCM require further investigation.

Purpose of the Study:

  • To investigate the relationship between myocardial blood flow (MBF), fibrosis, and clinical manifestations in patients with hypertrophic cardiomyopathy (HCM).
  • To assess MBF as a predictor of clinical status and adverse events in HCM.

Main Methods:

  • Cardiac magnetic resonance imaging (CMR) was used to assess MBF and myocardial fibrosis (late gadolinium enhancement - LGE) in 62 HCM patients, 15 acromegalic patients, and 20 healthy controls.
  • Resting MBF was quantified using phase-contrast imaging of coronary sinus flow relative to left ventricular mass.
  • Clinical status was evaluated using New York Heart Association (NYHA) functional class and Holter monitoring for ventricular tachycardia.

Main Results:

  • HCM patients exhibited significantly lower resting MBF compared to controls and acromegalic patients.
  • Patients with LGE (fibrosis) and ventricular tachycardia had significantly lower MBF.
  • Lower MBF was observed in HCM patients with NYHA functional class ≥II compared to those in NYHA class I.
  • MBF was identified as the sole independent predictor of worse clinical status (NYHA ≥II).

Conclusions:

  • Low resting MBF is significantly associated with the presence of myocardial fibrosis in HCM patients.
  • Reduced MBF serves as a critical predictor of a worse clinical status in individuals with HCM.
Abstract

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