Association of interpregnancy interval with uterine scar failure in labor:A case-control study

OBJECTIVE: The aim of this study was to determine whether a short interpreg nancy interval is associated with uterine scar failure in laboring patients with previous low transverse cesarean delivery. STUDY DESIGN: This was a case-control study of uterine scar failures among laboring patients with previous low transverse cesarean delivery. Control p atients underwent abdominal delivery during labor after failure of an attem pted vaginal birth after cesarean delivery in the same month as case patien ts. RESULTS: An interpregnancy interval of <6 months was significantly more pre valent among case patients with uterine scar failure (P = .02). Mean interp regnancy interval was less in all cases of uterine scar failure (P = .06). CONCLUSIONS: Interpregnancy interval was inversely associated with likeliho od of uterine scar failure during subsequent labor.