Parturitional factors associated with membrane stripping.

Abstract

Our purpose was to determine what factors occurring after digital separation of the chorionic membranes from the lower uterine segment (membrane stripping) are involved in observed clinical changes compared with patients not so treated. Thirty patients were randomly divided among a study population and two control groups to assess uterine contractions and microbiologic, histologic, and biochemical markers associated with parturitional events over a 7-hour time frame. Clinically, an increased frequency of uterine contractile activity was observed among patients in the membrane-stripped group (p < 0.03). There was a significant increase in plasma 13,14-dihydro-15-keto-prostaglandin F2 alpha (p < 0.001) and endocervical phospholipase A2 activity (p < 0.04) among those who underwent membrane stripping. Blood leukocyte counts, sedimentation rates, prostaglandin E2 metabolite concentrations, and fibronectin levels revealed no significant change during the 7-hour study session. Membrane stripping was associated with increases in phospholipase A2 activity and prostaglandin F2 alpha concentrations, indicating a possible correlation with initiation of the cascade of parturitional events.