Successful versus unsuccessful instrumental deliveries-Predictors and obstetric outcomes.

Objective: The purpose of this study was to examine instrumental births in a multi-ethnic population to assess the factors associated with success and failure in instrumental births.

Study Design: This was a large retrospective study of 7954 women that underwent either a successful or an unsuccessful instrumental delivery in a single centre over a 10 year period.

Results: Logistic regression analysis showed that women with a BMI of more than 30, attempted Forceps delivery, having a prolonged second stage, Macrosomia (birth weight more than 4 kg) and a senior obstetrician performing the procedure increase the risk of a failed instrumental delivery.