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New phenotype of familial dilated cardiomyopathy and conduction disorders

Elsa Silva Oropeza1, Carmen Navarrete Cadena

  • 1Department of Cardiac Electrophysiology, Hospital de Cardiología, Centro Médico Nacional Siglo XXI, IMSS, Mexico. silva_elsa@terra.com.mx

American Heart Journal
|February 22, 2003
PubMed

Insights

This study identifies a unique form of familial dilated cardiomyopathy (FDCM) with autosomal dominant inheritance. The condition predominantly affects males, often presenting with cardiac conduction abnormalities like atrioventricular block (AVB).

Area of Science:

  • Cardiology
  • Genetics
  • Molecular Biology

Background:

  • Familial dilated cardiomyopathy (FDCM) is linked to cytoskeletal protein defects.
  • Previous studies identified varied inheritance patterns and phenotypes in FDCM.
  • This study investigates a large family with multiple affected individuals across generations.

Purpose of the Study:

  • To characterize a novel familial dilated cardiomyopathy (FDCM) with distinct inheritance and presentation.
  • To analyze the clinical expression of dilated cardiomyopathy (DCM) and cardiac conduction abnormalities within a family.
  • To determine the mode of inheritance for this specific FDCM.

Main Methods:

  • Conducted a clinical family study involving 24 individuals over 3 generations.
  • Monitored patients for the development of dilated cardiomyopathy (DCM) and cardiac conduction abnormalities.
  • Analyzed clinical data for patterns of inheritance and phenotypic expression.

Main Results:

  • DCM developed in 7 males, 6 with atrioventricular block (AVB); 17 individuals had isolated AVB.
  • A strong male predominance for cardiac dilation was observed.
  • The vertical distribution of affected individuals suggests autosomal dominant inheritance.

Conclusions:

  • This FDCM presents with isolated AVB or AVB associated with DCM, differing from previously described forms.
  • The condition follows an autosomal dominant inheritance pattern with variable expressivity.
  • Atrioventricular block (AVB) can be the sole manifestation of this familial dilated cardiomyopathy.
Abstract

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