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Changes in cardiac tissue characterization in carriers with gene mutations associated with hypertrophic

Tomoya Kaneda1, Masami Shimizu, Hidekazu Ino

  • 1Molecular Genetics of Cardiovascular Disorders, Division of Cardiovascular Medicine, Graduate School of Medical Science, Kanazawa University, Takara-machi 13-1, Kanazawa 920-8640, Japan.

International Journal of Cardiology
|September 20, 2005
PubMed

Insights

Integrated backscatter (IB) detects early hypertrophic cardiomyopathy (HCM) changes in gene carriers, even without wall hypertrophy. Acoustic densitometry reveals tissue alterations in HCM carriers with ECG abnormalities, suggesting potential for early detection.

Area of Science:

  • Cardiology
  • Biomedical Engineering
  • Genetics

Background:

  • Early detection of hypertrophic cardiomyopathy (HCM) is crucial for patient management.
  • Integrated backscatter (IB) offers a noninvasive method to assess myocardial acoustic properties and detect early changes.
  • HCM is a genetic heart condition characterized by thickening of the heart muscle.

Purpose of the Study:

  • To investigate whether acoustic densitometry can detect myocardial tissue changes in HCM gene carriers before the development of wall hypertrophy.
  • To assess the utility of IB in identifying early cardiac alterations in individuals with genetic predispositions to HCM.

Main Methods:

  • Studied 34 HCM gene mutation carriers, categorized into groups based on wall hypertrophy and ECG abnormalities.
  • Utilized ECG, conventional echocardiography, and acoustic densitometry (including IB and cyclic variations of IB - CV-IB).
  • Compared young carriers (< or =20 years) with age-matched control subjects.

Main Results:

  • Group A (with hypertrophy) showed significantly smaller CV-IB and higher IB amplitude in the interventricular septum and left ventricular posterior wall compared to Group C (no hypertrophy/ECG changes).
  • Group B (ECG abnormalities, no hypertrophy) exhibited significantly smaller CV-IB in the interventricular septum than Group C.
  • Young carriers in Group B-2 (ECG abnormalities, no hypertrophy) had smaller CV-IB than controls, while Group C-2 (no abnormalities/hypertrophy) did not differ from controls.

Conclusions:

  • Tissue characterization changes are detectable in HCM gene carriers, even without apparent wall hypertrophy.
  • Acoustic densitometry methods, particularly IB, can identify myocardial alterations in HCM carriers lacking hypertrophy.
  • These tissue changes may be detectable alongside the emergence of ECG abnormalities, aiding in early HCM diagnosis.
Abstract

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