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Nature of heart failure in patients with ventricular septal defect

J M Stewart1, T H Hintze, P K Woolf

  • 1Department of Pediatrics, New York Medical College, Valhalla 10595, USA.

The American Journal of Physiology
|October 1, 1995
PubMed

Insights

Congestive heart failure in children with ventricular septal defect is mainly caused by systolic dysfunction, not diastolic dysfunction. This study highlights key differences in cardiac function between affected and unaffected children.

Area of Science:

  • Pediatric Cardiology
  • Cardiovascular Physiology

Background:

  • Congestive heart failure (CHF) in children with ventricular septal defect (VSD) can stem from systolic or diastolic dysfunction.
  • Understanding the primary cause is crucial for effective management.

Purpose of the Study:

  • To determine whether systolic or diastolic dysfunction contributes more significantly to CHF in pediatric VSD patients.
  • To compare cardiac function parameters between VSD children with and without CHF.

Main Methods:

  • Studied 13 children with VSD using Millar catheterization and M-mode echocardiography.
  • Assessed systolic function via left ventricular pressure (LVP), dP/dt, and end-systolic pressure-diameter relation (ESPDR).
  • Evaluated diastolic function using isovolumic relaxation time constant (tau) and end-diastolic pressure-diameter relation (EDPDR).

Main Results:

  • Children with CHF showed lower +dP/dt and ESPDR slopes compared to those without CHF.
  • Systolic myocardial function, assessed by stress-strain relation, was impaired in CHF patients.
  • Diastolic dysfunction, indicated by a prolonged tau and altered EDPDR, was less prominent than systolic dysfunction.

Conclusions:

  • Systolic dysfunction is the primary contributor to congestive heart failure in children with ventricular septal defect.
  • Therapeutic strategies for VSD-associated CHF should prioritize addressing systolic impairments.

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