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A study of factors affecting blood pressure and angiotensin II in newborn infants

F Broughton Pipkin, O R Smales

    The Journal of Pediatrics
    |July 1, 1977
    PubMed

    Insights

    This study found that infant blood pressure correlates with gestational age and body weight. Respiratory distress in newborns is linked to low blood pressure and high angiotensin II levels.

    Area of Science:

    • Neonatal physiology
    • Cardiovascular research
    • Pediatric medicine

    Background:

    • Establishing normal blood pressure ranges in neonates is crucial for early detection of cardiovascular issues.
    • Understanding the role of the renin-angiotensin system in infant blood pressure regulation is an ongoing area of research.

    Purpose of the Study:

    • To investigate the relationship between blood pressure, gestational age, and body weight in newborns.
    • To examine the correlation between venous angiotensin II levels and blood pressure in infants.
    • To assess blood pressure and angiotensin II levels in neonates with respiratory distress.

    Main Methods:

    • Doppler ultrasonic technique was used to measure blood pressure in 144 infants within the first 11 days of life.
    • Radioimmunoassay was employed to determine venous angiotensin II levels in 75 infants.
    • Statistical analysis was performed to identify significant correlations.

    Main Results:

    • Systolic blood pressure showed a significant positive correlation with gestational age and body weight.
    • Angiotensin II levels were inversely related to blood pressure and significantly correlated with birth weight.
    • Infants experiencing respiratory distress exhibited significantly lower blood pressure (hypotension) and markedly elevated angiotensin II levels.

    Conclusions:

    • Gestational age and body weight are key determinants of blood pressure in early neonatal life.
    • The renin-angiotensin system, indicated by angiotensin II, plays a role in modulating blood pressure in neonates.
    • Respiratory distress syndrome in newborns is associated with both hemodynamic compromise and hormonal alterations, specifically hypotension and increased angiotensin II.

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