Evaluation of combined left ventricular function using the myocardial performance index in children with chronic

Roya Isa Tafreshi1, Nakisa Human, Hasan Otukesh

  • 1Department of Pediatric Cardiology, Iran University of Medical Sciences, Aliasghar Children's Hospital, Tehran, Iran. tafreshi@iums.ac.ir

Insights

Myocardial performance index (MPI) measured by pulsed-wave Doppler (PWD) and tissue Doppler imaging (TDI) effectively detects early left ventricular dysfunction in children with chronic kidney disease (CKD). TDI-MPI offers superior predictive discrimination compared to PWD-MPI.

Area of Science:

  • Pediatric Cardiology
  • Nephrology
  • Echocardiography

Background:

  • Myocardial dysfunction in early chronic kidney disease (CKD) stages 2-4 is not well-characterized in pediatric populations.
  • Early detection of global left ventricular (LV) dysfunction is crucial for managing pediatric CKD patients.

Purpose of the Study:

  • To assess the clinical usefulness of myocardial performance index (MPI) via pulsed-wave Doppler (PWD-MPI) in predicting early LV function disturbances in children with CKD.
  • To evaluate the utility of tissue Doppler imaging (TDI) for calculating MPI (TDI-MPI) and compare it with the conventional PWD method.

Main Methods:

  • Echocardiography performed on 34 children (3-18 years) with CKD stages 2-4 and 35 age-matched healthy controls.
  • PWD-MPI calculated from mitral inflow and LV outflow Doppler spectra.
  • TDI-MPI calculated using time intervals measured from the mitral annulus.

Main Results:

  • Both PWD-MPI and TDI-MPI values were significantly different in pediatric CKD patients compared to controls.
  • TDI-MPI demonstrated superior predictive discrimination for identifying myocardial dysfunction versus PWD-MPI.
  • TDI-MPI (cutoff >0.34) showed 91% sensitivity and 82% specificity for LV dysfunction, while PWD-MPI (cutoff >0.36) had 64.7% sensitivity and 97% specificity.

Conclusions:

  • Subtle left ventricular function abnormalities are present early in pediatric patients with mild to moderate renal insufficiency.
  • Both PWD-MPI and TDI-MPI are appropriate indicators of global LV function in young patients with CKD.
  • TDI-MPI is a more sensitive tool for identifying LV dysfunction in this population.
Abstract

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