Incidence and ultrasonographic characteristics of cesarean scar niches after uterine closure by double-layer barbed suture: a prospective comparative study.

OBJECTIVE: To compare the ultrasonographic features of uterine scars and clinical symptoms after cesarean delivery (CD) using barbed and conventional smooth sutures.

METHODS: This case-control study enrolled women who underwent primary CD at 37 weeks of gestation or later. The uterus was closed using either double-layer unidirectional barbed suture or conventional double-layer smooth suture. Ultrasound scans of the uterine scar and evaluations of menstrual patterns were performed at 6, 12, and 24 months after surgery.

RESULTS: 102 patients underwent uterine closure with barbed suture, while 135 patients underwent smooth suture. At 6 months, patients in the barbed group had a lower incidence of uterine niches (20.2% vs 32.6%) that were also shallower in depth (p < 0.001). Lower incidence of niches was also observed in the barbed group at 12 and 24 months (p = 0.043 and 0.048, respectively). At these two follow-up times, the smooth group had a higher number of patients reporting postmenstrual spotting (p < 0.05) and more postmenstrual spotting days per month (p < 0.050).

CONCLUSION: The use of double-layer barbed suture during CD was associated with a lower incidence of scar niches and a more favorable menstrual pattern compared to the use of smooth suture.