Plasma thrombomodulin level in newborn infants with and without perinatal asphyxia.

To determine whether vascular endothelial damage occurs in neonates with asphyxia, we examined the plasma thrombomodulin level at birth in infants with and without asphyxia. The plasma thrombomodulin concentration in 11 asphyxiated infants was significantly elevated compared with that in 48 infants without asphyxia (38.1 vs 27.0 micrograms/l, p < 0.0001). The plasma thrombomodulin-to-serum creatinine ratio was also significantly elevated (0.62 vs 0.48 microgram/mumol, p = 0.0005). The plasma thrombomodulin concentration and the plasma thrombomodulin-to-serum creatinine ratio in infants without asphyxia did not differ between the two types of delivery: normal vaginal delivery and elective caesarean section. Stepwise regression analysis showed the serum D-dimer concentration, plasma pH and serum creatinine concentration were significant independent variables for plasma thrombomodulin concentration, whereas base deficit, platelet count, fibrinogen concentrations and antithrombin III activity were not. Our data suggest that vascular endothelial damage might occur in asphyxiated infants.