Developmental outcome at 6.5 years after acidosis in term newborns: a population-based study

Area of Science:

• Neonatal Medicine
• Developmental Pediatrics
• Perinatal Research

Background:

• Perinatal asphyxia can lead to infant encephalopathy, increasing mortality and adverse neurologic outcomes.
• The long-term developmental impact of metabolic acidosis at birth in seemingly healthy infants remains unclear.
• Existing research presents conflicting findings on the outcomes for infants with metabolic acidosis who do not exhibit signs of encephalopathy.

Purpose of the Study:

• To investigate the association between metabolic acidosis at birth and long-term developmental abnormalities in term infants who appear healthy.
• To determine if infants with cord metabolic acidosis, without signs of encephalopathy, face an increased risk of developmental issues later in childhood.
• To provide clarity on the prognosis for healthy-appearing newborns diagnosed with metabolic acidosis.

Main Methods:

• A population-based cohort of 14,687 deliveries was analyzed.
• 78 infants with metabolic acidosis (umbilical artery pH < 7.05 and base deficit >12.0 mmol/L) were prospectively identified.
• Each case was matched with two controls, and child health records were reviewed up to 6.5 years of age for developmental abnormalities.

Main Results:

• Outcome data at 6.5 years were obtained for 97% of the children (227/234).
• No significant differences were observed in neurologic or behavioral problems requiring referral between acidotic infants and their matched controls.
• No differences were found in neurodevelopmental diagnoses between the groups.

Conclusions:

• Term infants born with metabolic acidosis who appear healthy do not exhibit an increased risk for neurologic or behavioral problems at 6.5 years of age.
• The findings suggest that metabolic acidosis alone, in the absence of encephalopathy or need for neonatal care, does not predict adverse long-term neurodevelopmental outcomes.
• These results support the current clinical approach of closely monitoring, rather than intervening specifically for, metabolic acidosis in well-appearing newborns.