Increasing Maternal Body Mass Index and Characteristics of the Second Stage of Labor
Year: 2011
Type: article
Abstract: OBJECTIVE: To evaluate the length of the second stage of labor in relation to increasing maternal prepregnancy body mass index (BMI) among nulliparous parturient women, and to determine whether route of delivery differs among obese, overweight, and normal-weight women reaching the second stage of labor. METHODS: We performed a secondary analysis of a multicenter trial of fetal pulse oximetry conducted among 5,341 nulliparous women who were induced or labored spontaneously at 36 weeks or more of gestation. Normal weight was defined as BMI of 18.5-24.9 kg/m, overweight was a BMI of 25.0-29.9 kg/m, and obese was a BMI of 30 or higher. RESULTS: Of the 5,341 women, 97% had prepregnancy BMI recorded. Of these, 3,739 had BMIs of 18.5 or higher and reached the second stage of labor. Increasing maternal BMI was not associated with second stage duration: normal weight, 1.1 hour; overweight, 1.1 hour; and obese, 1.0 hours (P=.13). Among women who reached the second stage, as BMI increased, so did the likelihood that the woman had undergone induction of labor. Even so, the lack of association between second-stage duration and BMI did not vary by method of labor onset (P=.84). The rate of cesarean delivery in the second stage did not differ by increasing BMI (normal weight 7.1%, overweight 9.6%, obese 6.9%, P=.17). CONCLUSION: Among nulliparous women who reach the second stage of labor, increasing maternal BMI is not associated with a longer second stage or an increased risk of cesarean delivery. LEVEL OF EVIDENCE: II.
Source: Obstetrics and Gynecology
Institutions: Northwestern University, University of North Carolina at Chapel Hill, University of Utah, University of Alabama at Birmingham, Wake Forest University Health Sciences, The Ohio State University, Case Western Reserve University, Columbia University, The University of Texas Health Science Center at Houston, MetroHealth Medical Center, The University of Texas Southwestern Medical Center
Language: English
Subfield: Obstetrics and Gynecology
Field: Medicine
Domain: Health Sciences
Open Access status: green
Awards: G1216570417, Carolina Population Center, Maternal Fetal Medicine Network: Data Coordinating Cent*, G1789099407, G1882602020, Eunice Kennedy Shriver NICHD Maternal Fetal Medicine Units Network, Maternal Fetal Medicine Units Network, G2254024324, NICHD Maternal Fetal Medicine Units Network, G2594613454, NICHD Maternal-Fetal Medicine Units (MFMU) Network, G284963502, G2925552923, G29782494, NICHD Maternal Fetal Medicine Units Network, Eunice Kennedy Shriver NICHD Maternal Fetal Medicine Units Network, Cooperative Multicenter Maternal Fetal Medicine Units Networks, G3786447104, G3875946430, G4027080872, Co-Operative Multicenter Trials in Obstetrics & Maternal Fetal Medicine, Data Coord Ctr-NICHD Cooperative Multicenter Maternal Medicine Units Research Net, MULTICENTER NETWORK OF MATERNAL-FETAL MEDICINE UNITS, Multicenter Network of Maternal Fetal Medicine Units, G4657398957, G50908112, Eunice Kennedy Shriver NICHD Maternal Fetal Medicine Units Network (U10), G6657596466, G673807916, Brown/WIH Eunice Kennedy Shriver NICHD MFM Units Network Site, Maternal Fetal Medicine Network, NICHD Materal Fetal Medicine Units Network, MULTICENTER NETWORK OF MATERNAL-FETAL MEDICINE UNITS, UofU Maternal-Fetal Medicine Units (MFMU) Network: Clinical Centers, NICHD Maternal-Fetal Medicine Units (MFMU) Network: Data CoordinatingCenter, Brown University/Women & Infants Hospital of Rhode Island (WIH) Center Application for the Eunice Kennedy Shriver NICHD Maternal Fetal Medicine Units Network, Maternal Fetal Medicine Units Network - Northwestern Study Center, Maternal-Fetal Medicine Units (MFMU) Network, Case Western Reserve University Center of the NICHD MFMU Network, Columbia University Maternal-Fetal Medicine Units Network Clinical Center, NICHD maternal fetal medicine units network, UNC MFMU: Advancing Perinatal Health via Definitive, Multi-Site Clinical Studies, Eunice Kennedy Shriver NICHD Maternal-Fetal Medicine Units (MFMU) Network (UG1), G922324195
OpenAlex ID: W1997655947