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Left atrial dysfunction in chagas cardiomyopathy is more severe than in idiopathic dilated cardiomyopathy: a study

Frederico J N Mancuso1, Dirceu R Almeida, Valdir A Moisés

  • 1Discipline of Cardiology, Department of Internal Medicine, Federal University of São Paulo, Sao Paulo, Brazil.

Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography
|March 1, 2011
PubMed

Insights

Left atrial function is significantly impaired in Chagas cardiomyopathy (CCM) patients compared to dilated cardiomyopathy (DCM) patients. This suggests a more severe myocardial impact in Chagas disease, affecting left atrial function and potentially increasing left ventricular filling pressures.

Area of Science:

  • Cardiology
  • Echocardiography
  • Myocardial Diseases

Background:

  • Atrial involvement is known in Chagas cardiomyopathy (CCM).
  • The specific impact on left atrial (LA) function remains unclear.
  • This study compares LA function in CCM versus idiopathic dilated cardiomyopathy (DCM).

Purpose of the Study:

  • To evaluate left atrial (LA) function in Chagas cardiomyopathy (CCM) patients.
  • To compare LA function between CCM and idiopathic dilated cardiomyopathy (DCM) patients.
  • To utilize real-time three-dimensional echocardiography (RT3DE) for precise LA function assessment.

Main Methods:

  • Studied 30 CCM patients, 30 DCM patients, and 20 controls.
  • Employed real-time three-dimensional echocardiography (RT3DE).
  • Measured LA volumes and calculated total and active LA emptying fractions.

Main Results:

  • Chagas cardiomyopathy (CCM) patients exhibited larger maximum LA volumes (MaxLAV/m²) than DCM patients.
  • Both CCM and DCM groups showed reduced total and active LA emptying fractions compared to controls.
  • CCM patients had higher E/e' ratios, indicating increased left ventricular filling pressures, and this was linked to impaired active LA emptying fraction.

Conclusions:

  • Left atrial (LA) function is more compromised in Chagas cardiomyopathy (CCM) than in idiopathic dilated cardiomyopathy (DCM).
  • This suggests a more diffuse and severe myocardial impairment in Chagas disease.
  • Impaired LA function in CCM may be linked to elevated left ventricular filling pressures and atrial myopathy.
Abstract

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