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Elevated Trans-mitral Pressure Gradient Predicts Surgery in Young People with Moderate-Severe Rheumatic Mitral

Jacqueline M Williamson1,2,3, Gillian A Whalley4, Ari E Horton5,6,7

  • 1Child and Maternal Health Division, Menzies School of Health Research, Darwin, Australia. jacqui.williamson@menzies.edu.au.

Pediatric Cardiology
|October 15, 2024
PubMed

Insights

In children with rheumatic heart disease and mitral regurgitation, a higher trans-mitral pressure gradient (TMPG) predicts the need for future mitral valve surgery. This finding aids in optimizing surgical timing for rheumatic heart disease patients.

Area of Science:

  • Pediatric Cardiology
  • Rheumatic Heart Disease Research
  • Echocardiography in Valve Disease

Background:

  • Rheumatic heart disease (RHD) is a significant cause of acquired heart valve disease in children, with mitral regurgitation (MR) being the most common manifestation.
  • Progression of RHD often leads to left ventricular dilatation and heart failure, necessitating surgical intervention.
  • The optimal timing for surgical intervention in pediatric RHD patients with MR is crucial for improving outcomes.

Purpose of the Study:

  • To investigate whether an elevated trans-mitral pressure gradient (TMPG) in children with moderate to severe rheumatic MR, without significant mitral stenosis, can predict the need for future mitral valve surgery.
  • To assess the predictive value of TMPG for surgical intervention in this specific pediatric population.

Main Methods:

  • Retrospective review of echocardiographic studies for 116 children and young adults with moderate or severe rheumatic MR.
  • Exclusion of patients with significant mitral stenosis or concurrent aortic valve disease.
  • Measurement of baseline trans-mitral pressure gradient (TMPG) and tracking of subsequent mitral valve surgical interventions over up to six years.

Main Results:

  • Patients with a TMPG ≥ 5 mmHg had a significantly increased risk of requiring mitral valve surgery (Hazard Ratio = 5.8).
  • The proportion of patients free from surgery at one year was higher in the TMPG < 5 mmHg group (0.94) compared to the TMPG ≥ 5 mmHg group (0.62).
  • Trans-mitral pressure gradient emerged as a strong, non-invasive predictor of future surgical intervention.

Conclusions:

  • Trans-mitral pressure gradient is a powerful predictor of future mitral valve surgery in pediatric patients with rheumatic mitral regurgitation without significant mitral stenosis.
  • This non-invasive measurement can help identify patients who may benefit from closer monitoring and optimized surgical timing.
  • Utilizing TMPG can aid in proactive management strategies for children and young people affected by rheumatic heart disease.

Keywords:
EchocardiographyMitral regurgitationMitral valve surgeryRheumatic heart diseaseTrans-mitral pressure gradient

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