Umbilical arteritis and phlebitis mark different stages of the fetal inflammatory response.
OBJECTIVE
Funisitis, the inflammation of the umbilical cord determined by histologic examination of the placenta, is evidence of a fetal inflammatory response. The inflammatory process may involve the umbilical vein (phlebitis) and one or both umbilical arteries (arteritis) and extend into the Wharton's jelly. This study was conducted to examine whether the pattern of inflammation of the umbilical cord correlates with a biochemical marker of systemic fetal inflammation (umbilical cord plasma interleukin-6) and an adverse neonatal outcome.


METHODS
This cohort study included 636 cases of preterm delivery (<36 weeks) with or without inflammation of the umbilical cord. Umbilical cord blood was collected at the time of delivery. The aim of pathologic examination was to characterize the extent of umbilical cord inflammation and the involvement of the vein (phlebitis), the involvement of one or both arteries (arteritis), and the presence of inflammation of the Wharton's jelly. Umbilical cord plasma interleukin-6 concentrations were assayed by a sensitive and specific immunoassay.


RESULTS
Neonates with umbilical arteritis had a significantly higher median concentration of cord plasma interleukin-6 (median, 111 pg/mL; range, 0.1-19,230 pg/mL) than those without umbilical arteritis (median, 22.5 pg/mL; range, 0.9-511.6 pg/mL; P <.05). Also, severe neonatal morbidity occurred more frequently in infants with arteritis than in those without arteritis (74% vs 50%; P <.05). And finally, the most severe form of inflammation, which involves both arteries, vein, and Wharton's jelly, was associated with the highest median concentration of plasma interleukin-6 observed in this study (median, 182.6 pg/mL; range, 0.1-7,400 pg/mL), whereas inflammation limited to the vein (phlebitis) was associated with a lower concentration of cord plasma interleukin-6 (median, 29.1 pg/mL; range, 0.9-511.6 pg/mL; P <.05).


CONCLUSIONS
Neonates whose placenta demonstrates umbilical arteritis have higher concentrations of umbilical cord plasma interleukin-6 and higher rates of adverse outcome than those without umbilical arteritis.
Kim
C J
CJ
Department of Pathology, Seoul National University College of Medicine, Korea.
Yoon
B H
BH
Romero
R
R
Moon
J B
JB
Kim
M
M
Park
S S
SS
Chi
J G
JG
D001167:Arteritis / Q000097:blood / Q000175:diagnosis* / Q000473:pathology; D015331:Cohort Studies; D005260:Female; D005312:Fetal Blood / Q000737:chemistry; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D007249:Inflammation / Q000175:diagnosis* / Q000473:pathology; D015850:Interleukin-6 / Q000097:blood; D007752:Obstetric Labor, Premature; D010689:Phlebitis / Q000097:blood / Q000175:diagnosis* / Q000473:pathology; D011247:Pregnancy; D018805:Sepsis / Q000151:congenital; D014469:Umbilical Arteries / Q000473:pathology; D014470:Umbilical Cord / Q000473:pathology*; D014471:Umbilical Veins / Q000473:pathology
D015850:Interleukin-6