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Related Experiment Videos

Exercise radionuclide right ventriculography in children.

M S Schaffer1, M de Souza, D L Gilday

  • 1Division of Cardiology, Hospital for Sick Children, Toronto, Ontario, Canada.

Pediatric Cardiology
|January 1, 1987
PubMed
Summary

Exercise increases right ventricular ejection fraction in children with hypercholesterolemia. Nuclear imaging shows improved heart function, but accuracy requires careful consideration.

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Area of Science:

  • Pediatric Cardiology
  • Nuclear Cardiology
  • Cardiovascular Physiology

Background:

  • Hypercholesterolemia in children can affect cardiovascular health.
  • Assessing right ventricular function during exercise is crucial for understanding cardiac response.

Purpose of the Study:

  • To evaluate right ventricular function in children with hypercholesterolemia during supine exercise.
  • To assess the utility of equilibrium radionuclide right ventriculography in this population.

Main Methods:

  • Supine exercise equilibrium radionuclide right ventriculography was performed on 13 children (8-18 years) with hypercholesterolemia.
  • Phase analysis and background correction were employed for right ventricular region of interest.
  • Measurements included right ventricular ejection fraction, end-diastolic volume, end-systolic volume, and stroke volume.

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Main Results:

  • Resting and exercise right ventricular ejection fraction were 50.5% and 61.5%, respectively (mean increase of 11.0%).
  • Exercise led to unchanged end-diastolic volume, a 19.4% decrease in end-systolic volume, and a 21.7% increase in stroke volume.
  • Stroke volume ratios approached unity, but interobserver and intraobserver correlations were only fair.

Conclusions:

  • Supine exercise significantly improves right ventricular ejection fraction in hypercholesterolemic children.
  • Nuclear equilibrium right ventriculography demonstrates potential for assessing exercise-induced cardiac changes.
  • The noted imprecision in the procedure necessitates cautious interpretation of results.