Creatine kinase isoenzymes in high-risk infants.

Serial measurements of serum creatine kinase isoenzymes were done from birth to 15 days of age in healthy premature infants, infants with perinatal or neonatal asphyxia and infants without asphyxia but with miscellaneous problems. Serum brain-specific fraction of creatine kinase (CK-BB) activity was higher in cord than in maternal serum (P < 0.01).

Thyroid function in preterm infants with respiratory distress syndrome.

Thyroid function was evaluated in premature infants 30 to 35 weeks EGA with severe RDS and was compared to that of healthy control subjects of similar EGA. The infants with RDS had significantly lower serum levels of T3, T4, and FT4I during the first 60, 90, and 30 days, respectively, and had elevated T3UR during the first 10 days. The mean (+/- SD) postdelivery TSH peak was lower in the RDS group (32.

Thyroid function in healthy premature infants.

Thyroid function was studied in healthy premature and term infants between 12 hours and 3 months of age. T4 and FT4I followed parallel courses in both groups; during the first 45 days, however, the values were significantly lower in premature infants under 34 weeks' EGA than in term infants (P less than 0.001).