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Early changes in the neonatal circulatory transition
F J Walther1, M J Benders, J O Leighton
1Department of Pediatrics, Drew University, Los Angeles, California.
The Journal of Pediatrics
|October 1, 1993
Summary
Neonatal circulatory transition involves rapid hemodynamic changes within 24 hours. Echocardiography can identify persistent pulmonary hypertension in infants with respiratory failure by tracking ductal flow and pressure differences.
Area of Science:
- Neonatal Physiology
- Pediatric Cardiology
- Medical Imaging
Background:
- Neonatal circulatory transition is a critical period after birth.
- Persistent pulmonary hypertension of the newborn (PPHN) is a serious condition.
- Echocardiography is essential for diagnosing neonatal cardiovascular issues.
Purpose of the Study:
- To define the normal course of neonatal circulatory transition.
- To identify echocardiographic markers for diagnosing PPHN.
- To assess circulatory changes in infants with respiratory failure.
Main Methods:
- Prospective study of 32 healthy term infants and 33 term infants with respiratory failure.
- Color and quantitative Doppler echocardiography performed from 30 minutes to 24 hours after birth.
- Measurements included cardiac output, pulmonary artery flow, aortopulmonary pressure difference, and ductal flow characteristics.
Main Results:
- Healthy infants showed most hemodynamic changes by 8 hours, with some right-to-left ductal shunting up to 12 hours.
- Infants with respiratory failure exhibited delayed ductal closure and high PPHN incidence.
- Aortopulmonary pressure difference and ductal flow patterns correlated with respiratory failure severity.
Conclusions:
- Echocardiographic parameters like aortopulmonary pressure difference and ductal shunting patterns are practical markers for neonatal circulatory transition.
- These markers aid in assessing PPHN in sick term infants.
- Delayed ductal closure and altered flow patterns indicate PPHN and correlate with respiratory distress severity.