Predicting Intra-abdominal Adhesions for Repeat Cesarean Delivery with the Ultrasound Sliding Sign

To evaluate the diagnostic value of the "sliding sign", a sonographic test, in predicting intra-abdominal adhesions for women undergoing repeat cesarean delivery.

This was a prospective observational study of women undergoing a scheduled repeat cesarean delivery at a regional hospital. The sliding sign is a sonographic observation of sliding movement between the uterus and the abdominal wall during deep breathing. The absence of the sliding sign was considered indicative of a high risk for dense uterine-abdominal adhesions, and this finding was compared with the operative findings. The primary outcome was the accuracy of the sliding sign in predicting adhesions. Secondary outcomes included incision-to-delivery time, operative time, and blood loss.

We examined 112 pregnant women. Dense uterine-abdominal adhesions were found in 15 women, 8 of whom had no sliding sign identified on ultrasound. Therefore, the presence of the sliding sign detected 78 out of 97 women without uterine-abdominal adhesions. The sensitivity, specificity, and positive and negative predictive values of the sliding sign were 53.3%, 80.4%, 29.6%, and 91.8%, respectively. The intra- and inter-observer reliability using the kappa coefficient showed moderate consistency at 0.43 and 0.45, respectively.

The sliding sign was less predictive than desired for clinical use, and it only detected half of the women with dense uterine-abdominal adhesions. Furthermore, a moderately low kappa coefficient indicates a lack of reproducibility, further emphasizing the sign's limited clinical value.