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Related Experiment Videos

Changes in right ventricular volume in early human neonates

M Tamura1, K Harada, T Ito

  • 1Department of Pediatrics, Akita University School of Medicine, Japan.

Early Human Development
|April 25, 1997
PubMed
Summary

Neonatal right ventricular end-diastolic volume (RVEDV) increases significantly within 24 hours after birth. This rise in RVEDV is linked to increased right ventricular stroke volume (RVSV), likely due to ductus arteriosus closure.

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Area of Science:

  • Neonatal Cardiology
  • Pediatric Echocardiography
  • Cardiovascular Physiology

Background:

  • The transition from fetal to neonatal circulation involves significant hemodynamic changes.
  • Understanding right ventricular adaptation is crucial for assessing neonatal cardiac function.

Purpose of the Study:

  • To investigate dynamic changes in right ventricular volume and function in early neonatal life.
  • To correlate these changes with the closure of the ductus arteriosus.

Main Methods:

  • Two-dimensional echocardiography was performed on 20 full-term neonates at 2, 24, and 120 hours of age.
  • Right ventricular end-diastolic volume (RVEDV), end-systolic volume (RVESV), and stroke volume (RVSV) were calculated using the bi-plane Simpson's rule.
  • The diameter of the ductus arteriosus was also measured.

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Main Results:

  • RVEDV significantly increased by 24 hours of age and remained stable thereafter.
  • RVSV showed a 36% increase at 24 hours compared to 2 hours, correlating well with RVEDV (r = 0.83).
  • The ductus arteriosus was closed in most neonates by 24 hours.

Conclusions:

  • The significant increase in RVEDV and RVSV by 24 hours postpartum suggests enhanced right ventricular filling and output.
  • Ductus arteriosus closure appears to be a primary driver for increased right ventricular volume load and subsequent adaptation.