Neonatal and maternal fibrinolysis: activation at time of birth.
Utilizing chromogenic synthetic substrate-based methods, determination of the plasma concentration of plasminogen, alpha 2-antiplasmin, alpha 2-macroglobulin, and B beta 15-42-related peptides were made at the time of birth in both newborns and mothers. Plasminogen levels were increased in the maternal group (150 +/- 26%), and markedly decreased in the newborn group (67 +/- 14%). The major inhibitors of fibrinolysis, alpha 2-antiplasmin and alpha 2-macroglobulin, were within normal range in both groups. Determination of B beta 15-42-related peptide showed markedly increased levels in the maternal group above control values (115 +/- 102, normal 29 +/- 12); the newborn group showed values only mildly elevated above control values (39 +/- 21). The results demonstrate increased fibrinolytic activity in both groups, though the degree of activation is significantly higher in the maternal group, as reflected by the higher levels of B beta 15-42-related peptides. Fibrinopeptide A levels confirm an activation of coagulation in both maternal and newborn groups (22 +/- 4 ng/ml and 138 +/- 22 ng/ml, respectively) with a significantly increased level in newborns (2-5 ng/ml normal).
C R
CR
Suarez
J
J
Walenga
L C
LC
Mangogna
J
J
Fareed
D005260:Female; D005312:Fetal Blood / Q000502:physiology*; D005338:Fibrin Fibrinogen Degradation Products / Q000032:analysis; D005342:Fibrinolysis; D005344:Fibrinopeptide A / Q000032:analysis; D006801:Humans; D007231:Infant, Newborn; D010446:Peptide Fragments; D010958:Plasminogen / Q000032:analysis; D011247:Pregnancy; D000979:alpha-2-Antiplasmin / Q000032:analysis; D000511:alpha-Macroglobulins / Q000032:analysis
D005338:Fibrin Fibrinogen Degradation Products; D010446:Peptide Fragments; D000979:alpha-2-Antiplasmin; D000511:alpha-Macroglobulins; C033786:fibrinogen Bbeta (15-42); D005344:Fibrinopeptide A; D010958:Plasminogen