Gestational sac Archives - Revista Brasileira de Ginecologia e Obstetrícia

Purpose: it has been demonstrated that delays in gestational sac development, in crown-rump length and low embryonic heart rate could be indicators of poor pregnancy outcome. The purpose was to evaluate the use of these three parameters together, which we named Biophysical Triple Test (BTT). Method: thirty-five singleton pregnancies following IVF treatment with intracytoplasmatic sperm injection (ICSI) were studied. All ultrasonographic scans were performed by the same examiner, 4-5 weeks after embryo transference (6-7 week gestation), using a Diasonics equipment, model Synergy, with a 7.0-MHz transvaginal transducer. The gestational sac (GS) was measured at the longest transverse diameter; the crown-rump length (CRL) was measured at the sagittal plan and the embryonic heart rate (EHR) was calculated from frozen B and M-mode and Doppler. The statistical test used was Fisher's test. Results: the following parameters were considered abnormal: GS < 15.4 mm, CRL < 3.9 mm, EHR < 100 bpm. The parameters were calculated from the means less one standard deviation for the ongoing pregnancies. The patients with a positive BTT, i.e., with a high risk of miscarriage, were those with at least 2 altered parameters. In 35 pregnancies, a positive BTT was found in 5, all of those who miscarrided and 2 of those who had no miscarriage. The difference between the two groups was highly significant (p = 0.0015; t-Fisher). The sensitivity of the method was is 100%, with a specificity of 93.75 %, which resulted in a 96.87% efficacy. Conclusion: the BTT is an ultrasonographic noninvasive method that presents high efficacy as an indicator of poor pregnancy outcome.