Risk Factors of Caesarean Section due to Cephalopelvic Disproportion
Papungkorn Surapanthapisit MD*, Wiboolphan Thitadilok MD*
Affiliation : * Department of Obstetrics and Gynecology, Faculty of Medicine, Siriraj Hospital, Mahidol University
Objective : To identify risk factors of cesarean section due to cephalopelvic disproportion
Setting : Department of Obstetrics and Gynecology, Faculty of Medicine, Siriraj Hospital
Study
Design : Case-control study
Materials and Methods : One hundred and three singleton, viable, term pregnant women in cephalic presenta-
tion delivered by cesarean section due to cephalopelvic disproportion (CPD) and 105 controls gave normal
birth just before or after the study case. Demographic, anthropometric data, labor characteristics, and neona-
tal outcomes were obtained from medical records. The expected risk indicators of the case and control groups
were compared by using independent unpaired T-test and exact probability test as appropriate. Multiple
logistic regression analysis was used to determine the significant risk factors (p < 0.05).
Results : Significant independent risk factors of cesarean section due to CPD were: estimated fetal weight
(EFW) > 3,000 g (OR = 3.96, 95%CI = 2.06, 7.63), pre-pregnancy BMI > 25 kg/m2 (OR = 5.06, 95%CI = 1.67,
15.34), nulliparity (OR = 2.98, 95%CI = 1.31, 6.78) and the inadequacy of clinical pelvimetry (OR = 8.49,
95%CI = 1.01, 71.78), (p < 0.05).
Conclusion : Risk factors for cesarean section due to CPD were EFW > 3,000 g, pre-pregnancy BMI > 25 kg/m2,
nulliparity and the inadequacy of clinical pelvimetry. They are useful in the categorization of individual
women into high and low CPD-risk groups.
Keywords : Risk factors, Cephalopelvic disproportion, Cesarean section
