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OBJECTIVE: Our purpose was to determine whether transvaginal Doppler auscultation is more sensitive than transabdominal auscultation for the detection of fetal heart rate in the first trimester of pregnancy. STUDY DESIGN: In a prospective study 141 patients between 6 weeks and 11 weeks 6 days of gestation underwent both transvaginal and transabdominal Doppler evaluation by use of continuous-wave Doppler...