The apgar score and its components in the preterm infant

Area of Science:

• Neonatal Medicine
• Pediatrics
• Perinatal Research

Background:

• The Apgar score is a standard assessment for newborns but its application in preterm infants is less understood.
• Preterm infants present unique physiological challenges that may affect Apgar score interpretation.

Purpose of the Study:

• To evaluate the Apgar score's validity and correlations in preterm infants.
• To examine the relationships between 1- and 5-minute Apgar scores, individual Apgar components, and perinatal factors.
• To assess the association between Apgar scores, arterial blood pH, and infant mortality.

Main Methods:

• A population-based cohort study of 1105 preterm infants (birth weight <2000 g) from three intensive care nurseries.
• Linear correlation and multiple regression analyses were used to examine score relationships and associations with perinatal variables and pH.
• Stepwise logistic regression identified determinants of mortality.

Main Results:

• The 1-minute Apgar score (median 6) correlated with the 5-minute score (median 8) at r = .78.
• Apgar scores were significantly associated with birth weight, gestational age, and mode of delivery.
• Low Apgar scores and low arterial blood pH (<7.01) were significantly related to increased mortality.

Conclusions:

• Individual Apgar score components demonstrate variable inter-correlations, with color showing the weakest association.
• The Apgar score's utility in preterm infants is confirmed as limited, highlighting differential component responses.
• Findings underscore the importance of considering Apgar scores alongside other clinical and biochemical markers in preterm neonates.