Effect of increase amplitudes of pre pregnancy body mass index and gestational body mass index on pregnancy outcomes

Objective: To explore the effect of increase amplitudes of pre-pregnancy body mass index ( BMI) and gestational BMI on pregnancy outcomes. Methods: 360 primiparous women of single pregnancy were selected and divided into increase amplitudes of BMI 4 ( Ⅰ group) ,4≤increase amplitudes of BMI≤6 ( Ⅱ group) and increase amplitudes of BMI 6 ( Ⅲ group) according to increase amplitudes of pre pregnancy BMI and gestational BMI,the pregnancy outcomes were followed up. Results: There was no significant difference in rate of cesarean section and neonatal birth weight between pre pregnancy obesity group and pre pregnancy normal weight group ( P 0. 05) ; in pre pregnancy obesity group,the rate of cesarean section and incidence of macrosomia in increase amplitudes of BMI≥4 group increased significantly ( P 0. 05) ; in pre pregnancy normal weight group,the rate of cesarean section and incidence of macrosomia in increase amplitudes of BMI 6 group increased significantly ( P 0. 05) ; in pre pregnancy obesity group,the incidences of hypertensive disorder complicating pregnancy and gestational diabetes mellitus in increase amplitudes of BMI 6 group increased significantly ( P 0. 05) . Conclusion: The increase amplitudes of pre pregnancy BMI and gestational BMI are closely related to prognosis of mothers and infants,controlling pre pregnancy BMI and gestational BMI may reduce their complications.