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ULTRASONIC ASPIRATION TRANSDUCER FOR MANAGEMENT OF RH INCOMPATIBILITY

From the Department of Obstetrics and Gynecology at Duke Medical Center, Durham, North Carolina and The Departments of Gynecology and Obstetrics and Radiology, The Johns Hopkins Hospital, Baltimore, Maryland.
Address reprint requests to Roger C. Sanders, BM Department of Radiology The Johns Hopkins Hospital Baltimore, MD 21205

A 27-year-old woman, first seen during her third pregnancy at 19 weeks' gestation, was found to have a positive antiglobulin titer for Rh disease. An ultrasonogram demonstrated that the placenta covered almost the entire anterior part of the uterus. Two amniocenteses, using an ultrasonic aspiration transducer so that the placenta was avoided, were performed through a small placenta-free part of the anterior uterine wall, and from the data obtained from these amniocenteses an imrauterine transfusion was avoided. Subsequently, a normal baby was delivered. Amniocentesis via an ultrasound transducer is recommended in the management of Rh problems, for it avoids trauma to the placenta and to the fetus and gives an indication of the depth to which the needle has been inserted.