Extramembranous placement of an air-coupled vs. transducer-tipped intrauterine pressure catheter.

Objective: To compare the rate of extramembranous placement between 2 types of intrauterine pressure catheter.

Study Design: Women were randomized to a transducer-tipped intrauterine pressure catheter or an air-coupled intrauterine pressure catheter from October 1998 to August 1999. Women were eligible for the study if their attending physicians decided to place an intrauterine pressure catheter.