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Publication year
2011Source
Acta Obstetricia et Gynecologica Scandinavica, 90, 10, (2011), pp. 1107-1114ISSN
Publication type
Article / Letter to editor

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Organization
Gynaecology
Journal title
Acta Obstetricia et Gynecologica Scandinavica
Volume
vol. 90
Issue
iss. 10
Page start
p. 1107
Page end
p. 1114
Subject
NCEBP 14: Cardiovascular diseases; NCEBP 14: Cardiovascular diseases IGMD 6: Hormonal regulationAbstract
Objective. To study to what extent the fetal scalp blood lactate concentration during labor correlates with fetal scalp pH and base deficit, and metabolic acidosis at birth, and to suggest lactate cut-off values to serve as indicators for either reassurance or immediate intervention. Design. A retrospective observational study. Setting. Labor ward at a university medical center. Sample. Fetal scalp and cord blood samples with acid-base and lactate values from 486 singleton pregnancies beyond 34 weeks' gestation. Methods. The relation between lactate, pH and base deficit (BD) in fetal scalp blood was tested by Spearman's rho correlation coefficient. Lactate cut-off values indicating either reassuring fetal status or immediate intervention were estimated using percentile distribution and compared with pH and BD. Main outcome measures. Metabolic acidosis, defined as umbilical cord artery pH below 7.05 and BD calculated for the blood compartment above 12mmol/l. Results. After 127 (21%) exclusions, 486 cases were available for analysis. Fetal lactate values increased with evolving metabolic acidosis. Lactate concentration correlated with both pH (r=-0.50, p<0.01) and BD (r=0.48, p<0.01). Lactate <5.4mmol/l indicated reassuring fetal status, whereas lactate >/=6.6mmol/l indicated metabolic acidosis. Fetal lactate correlated better with either the absence or presence of metabolic acidosis at birth than did fetal pH and BD. Conclusions. In the case of a non-reassuring fetal heart rate, fetal scalp blood lactate provides more accurate information on fetal acid-base status than does pH and/or BD.
This item appears in the following Collection(s)
- Academic publications [202923]
- Electronic publications [101091]
- Faculty of Medical Sciences [80072]
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