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Umbilical Artery Blood Acid‐Base Analysis and Fetal Heart Rate Baseline in the Second Stage of Labor
Author(s) -
Honjo Shigeichiro,
Yamaguchi Masaaki
Publication year - 2001
Publication title -
journal of obstetrics and gynaecology research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.597
H-Index - 50
eISSN - 1447-0756
pISSN - 1341-8076
DOI - 10.1111/j.1447-0756.2001.tb01265.x
Subject(s) - medicine , umbilical artery , bradycardia , heart rate , anesthesia , cardiology , tachycardia , base excess , arterial blood , fetus , blood pressure , pregnancy , genetics , biology
Objective: To evaluate the correlation between umbilical arterial acidemia and second‐stage baseline fetal heart rate (FHR) abnormalities in Japanese newborn infants. Methods: Subjects were 365 newborns, born at term. Specimens were obtained from the umbilical artery as soon as possible after delivery and blood gas determinations were performed within 5 minutes of delivery. FHR monitoring was performed in the second stage. Results: Umbilical arterial acidemia occurred in 54.1% of the newborns with moderate to severe bradycardia, in 27.3% with mild bradycardia, and in 19.3% with tachycardia, compared with only 1.3% of those with a normal FHR (p < 0.001). The mean umbilical arterial base excess was significantly greater in newborns with metabolic acidemia (‐ 13.9 + 2.9 mmol/ l ) than in those with either mixed (‐ 11.5 + 2.8 mmol/ l ) (p < 0.02) or respiratory (‐ 9.1 + 3.2 mmol/ l ) (p < 0.01) acidemia. Conclusion: The second‐stage baseline FHR abnormalities were highly correlated with an increased risk of umbilical arterial acidemia at delivery.