A study to recognize and rule out the possibility of a CPD using simple maternal anthropometric measurements at an early stage of labor

Abstract

It was a prospective observational study. Primigravidae over 37 weeks' gestation attending the Obstetrics and Gynecology department at St. John’s Medical College Hospital during a one and a half year period with a singleton pregnancy in vertex presentation were included. Several anthropometric measurements like height, pre pregnancy weight, BMI, foot length, bis acromion diameter, inter trochanteric diameter, Michaelis Rhomboid – transverse and vertical diameter, SFH and abdominal girth were taken in 135 primigravidae. Fetal weight was estimated. Differences in these measurements between the vaginal delivery and CPD groups were analyzed. Based on multivariate analysis the risk factors for CPD in the study group were height < 152 cm, BMI > 23 kg/m2, foot length ≤23cm, Michaelis Rhomboid transverse diameter < 25 cm, inadequate pelvis and estimated fetal weight ≥ 3000g. If the risk assessment score developed with the positive predictors is < 6, it probably indicates a high chance of CPD and increased risk of caesarean delivery.