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Left Ventricular End-Diastolic Diameter and Cardiac Mortality in Duchenne Muscular Dystrophy

Kazuhiko Segawa1, Norio Sugawara2, Kazushi Maruo3

  • 1Department of Cardiology, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan.

Neuropsychiatric Disease and Treatment
|February 6, 2020
PubMed

Insights

Left ventricular end-diastolic diameter (LVDd) ≥ 55 mm predicts heart failure mortality in Duchenne muscular dystrophy (DMD) patients. Additional complications like left atrial enlargement also indicate increased mortality risk.

Area of Science:

  • Cardiology
  • Genetics
  • Neurology

Background:

  • Duchenne muscular dystrophy (DMD) is a genetic disorder causing progressive muscle degeneration.
  • Cardiomyopathy is a common complication in DMD, leading to heart failure.
  • Standard cardio-protective therapies are used, but predicting mortality remains crucial.

Purpose of the Study:

  • To determine if left ventricular end-diastolic diameter (LVDd) can predict heart failure mortality in DMD patients.
  • To identify other factors contributing to heart failure mortality in this population.

Main Methods:

  • Retrospective study of 133 DMD patients (≥10 years) with echocardiography data.
  • Patients grouped by initial LVDd: ≤ 54 mm (Group 1) and ≥ 55 mm (Group 2).
  • Subgroup analysis of Group 2 to compare outcomes based on developing left atrial enlargement, moderate mitral regurgitation, or pulmonary hypertension.

Main Results:

  • Higher mortality from heart failure in Group 2 (57.1%) compared to Group 1 (0.8%).
  • Patients in Group 2 with additional complications (Group 2B) had significantly shorter survival than those without (Group 2A).
  • LVDd ≥ 55 mm was a significant predictor of heart failure mortality.

Conclusions:

  • An LVDd of 55 mm or greater is a strong predictor of heart failure mortality in DMD patients.
  • Left atrial enlargement, moderate mitral regurgitation, and pulmonary hypertension are also critical predictors of mortality.
  • Early identification of these factors can aid in managing heart failure risk in DMD.
Abstract

Keywords:
cardiomyopathyechocardiographyheart failureleft atrial enlargementmitral regurgitationpulmonary hypertension

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