Postpartum urinary retention in women undergoing instrumental delivery: A cross‐sectional analytical study

Introduction Women undergoing instrumental delivery are known to be at higher risk of urinary retention, which can lead to long‐term complications such as voiding dysfunction. Nulliparous women undergo a pronounced and sudden change in the perineum due to stretching during delivery, which may add to the perineal trauma from an episiotomy, increasing the risk of urinary retention. We aim to study the incidence and risk factors associated with postpartum urinary retention in women undergoing instrumental delivery. Material and methods Pregnant women who had an instrumental delivery after 37 weeks of gestation at JIPMER, Puducherry, India, between January 2017 and June 2017 were included in the study. Postpartum urinary retention was defined as the inability to void spontaneously or ultrasonographic documentation of post‐void residual volume of >150 mL, 6 hours after delivery. Demographic factors, clinical profile and follow‐up of these patients were noted. Multivariate logistic regression analysis was performed to assess the risk factors associated with urinary retention and was presented as adjusted odds ratios (OR) with 95% confidence intervals (CI). Results Postpartum urinary retention was noted in 124 (20.6%) women undergoing instrumental delivery. Overt and covert urinary retention occurred in 2.3% and 18.3%, respectively. After adjusting for other risk factors, nulliparity (adjusted OR = 4.05, 95% CI 2.02‐8.12 compared with multiparity) and prolonged second stage (OR = 3.96, 95% CI 1.53‐10.25) compared with suspected fetal compromise as an indication for instrumental delivery was associated with increased risk of postpartum urinary retention. Interaction was noted between parity and episiotomy on the occurrence of postpartum urinary retention (P = .010). Among nulliparous women, those with episiotomy (adjusted OR = 6.10, 95% CI 2.65‐14.04) have higher odds of developing postpartum urinary retention compared with those without episiotomy. Conclusions Approximately one of five (20.6%) women undergoing instrumental delivery developed postpartum urinary retention. Among women undergoing instrumental delivery, episiotomy increased the chances of developing postpartum retention in nulliparous but not multiparous women. Prolonged second stage as an indication for instrumental delivery also increased the chances of retention. Future studies are needed to define the cutoff for diagnosis and to evaluate the long‐term effects of covert postpartum urinary retentio