Taiwanese Journal of Obstetrics and Gynecology
Volume 47, Issue 4 , Pages 397-401, December 2008

Fetal Acidosis from Obstetric Interventions During the First Vaginal Delivery

  • Chi-Feng Su

      Affiliations

    • Department of Obstetrics and Gynecology, Kuang Tien General Hospital, Taichung, Taiwan
    • Department of Obstetrics and Gynecology, and Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan
    • ,
  • Horng-Jyh Tsai

      Affiliations

    • Department of Obstetrics and Gynecology, Kuang Tien General Hospital, Taichung, Taiwan
    • ,
  • Che-Cheng Huang

      Affiliations

    • Department of Obstetrics and Gynecology, Kuang Tien General Hospital, Taichung, Taiwan
    • ,
  • Kan-Hung Luo

      Affiliations

    • Department of Obstetrics and Gynecology, Kuang Tien General Hospital, Taichung, Taiwan
    • ,
  • Long-Yau Lin

      Affiliations

    • Department of Obstetrics and Gynecology, and Institute of Medicine, Chung Shan Medical University, Taichung, Taiwan
    • Corresponding Author InformationCorrespondence to Dr Long-Yau Lin, Department of Obstetrics and Gynecology, Chung Shan Medical University, No. 110, Chien-Kao North Road, Section 1, Taichung 402, Taiwan

Accepted 16 August 2008.

Article Outline

SUMMARY 

Objective

The aim of this study was to analyze the blood gas values of umbilical cord blood in newborns of first vaginal deliveries with or without obstetric interventions.

Materials and Methods

In a prospective descriptive study conducted during the 6-month period from August 2003 through February 2004 at a university hospital, we analyzed the umbilical cord blood gas results of 80 term newborns delivered vaginally from healthy nulliparous women. Multivariate logistic analysis was used to evaluate the associations between fetal acidosis (pH < 7.20) and any obstetric interventions.

Results

The mean of umbilical cord blood arterial pH was 7.26 (standard deviation, 0.072). After controlling for the confounding factors with multivariate logistic regression, fetal acidosis (pH < 7.20) was found to be significantly associated with oxytocin augmentation (odds ratio [OR], 16.48; 95% confidence interval [CI], 1.21–226.1) and vacuum extraction (OR, 10.76; 95% CI, 1.025–112.9). In contrast, there was no significant relationship between fetal acidosis with episiotomy (OR, 1.096; 95% CI, 0.07–16.6) or epidural anesthesia (OR, 0.074; 95% CI, 0.003–2.09).

Conclusion

Oxytocin augmentation and vacuum extraction were significantly related to low cord arterial pH values (pH < 7.20), but there were no adverse effects to the newborns of first vaginal deliveries.

Key Words:  fetal acidosis , first vaginal delivery , low cord arterial pH , obstetric interventions , umbilical blood gas analysis

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PII: S1028-4559(09)60005-X

doi:10.1016/S1028-4559(09)60005-X

Taiwanese Journal of Obstetrics and Gynecology
Volume 47, Issue 4 , Pages 397-401, December 2008

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