Embryonic heart activity: appearance and development in early human pregnancy

Abstract excerpt

The appearance and development of embryonic cardiac activity was studied in early human pregnancies established by in-vitro fertilization (IVF) using transvaginal sonography. Embryonic cardiac activity could be detected as early as 25 days after follicle aspiration. The range in appearance of embryonic cardiac activity in normal continuing pregnancies was 5 days. There was no correlation with maternal age, day of...

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