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Blood pressure ranges in premature infants: II. The first week of life
T Hegyi1, M Anwar, M T Carbone
1Division of Neonatology, Department of Pediatrics, University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, New Brunswick, NJ 08903, USA.
Insights
Arterial blood pressure in premature infants steadily increases during the first week of life. Infants with birth asphyxia or requiring ventilation had lower blood pressures than healthy neonates.
Area of Science:
- Neonatal physiology and cardiovascular monitoring.
- Perinatal medicine and intensive care.
Background:
- Understanding arterial blood pressure trends in premature infants is crucial for neonatal care.
- Premature infants often experience physiological instability, necessitating close monitoring of vital signs.
Purpose of the Study:
- To investigate arterial blood pressure patterns during the initial week of life in a cohort of healthy premature infants.
- To compare blood pressure ranges across different risk groups within the premature population.
Main Methods:
- A population-based cohort study was conducted in three intensive care nurseries.
- Premature infants with birth weights under 2000g were enrolled.
- Daily maximum and minimum systolic and diastolic blood pressures were recorded for the first seven days, categorized into four groups based on risk factors.
Main Results:
- Arterial blood pressure demonstrated a consistent daily increase throughout the first week of life across all infant groups.
- No significant correlations were found between blood pressure variables and infant birth weight, gender, or race.
- Regression analysis indicated daily increases in systolic and diastolic blood pressure ranges.
Conclusions:
- Infants experiencing birth asphyxia or requiring mechanical ventilation exhibited significantly lower systolic and diastolic blood pressures compared to healthy premature infants.
- These findings highlight potential differences in cardiovascular adaptation based on neonatal conditions.
Objective:
To examine the arterial blood pressure in the first week of life in a healthy premature population.
Design:
Population-based cohort study.
Setting:
Three intensive care nurseries in central New Jersey.
Patients:
Premature infants with birth weights less than 2000 g.
Main Outcome Measures:
We documented daily maximum and minimum systolic and maximum and minimun diastolic blood pressures during the first 7 days of life. To examine the effects on the ranges of blood pressure, we identified four groups of infants: (1) healthy infants without any of the major risk factors (n = 193); (2) infants who were mechanically ventilated but free of any of the other conditions (n = 225); (3) infants with histories of maternal hypertension or preeclampsia (n = 38) and (4) infants with low Apgar scores (less than 3 at 1 minute and less than 6 at 5 minutes) regardless of the presence of other conditions (n = 86).
Results:
Blood pressure increased steadily in the first week of life in all four groups. There was no relationship between any of the four blood pressure variables, or trends in blood pressure over time, with birth weight, gender, or race. Regression equations (based on all infants with available data) for blood pressure ranges by day of life revealed that the maximum systolic blood pressure increased by 2.6 mm Hg/d, the minimum systolic blood pressure increased by 1.8 mm Hg/d,the maximum diastolic blood pressure increased by 2.0 mm HHg/d, and the minimum diastolic blood pressure increased by 1.3 Hg/d.
Conclusions:
Infants with birth asphyxia and ventilated infants had significantly lower systolic and diastolic blood pressures than healthy infants.