Abstract
Introduction: The earliest proof of a viable pregnancy is obtained when cardiac activity of the embryo can be observed. Transvaginal sonography can accurately demonstrate embryonic heart rate at 6 weeks of gestational age by using M-mode transvaginal sonography. Slow embryonic heart rate at 6-7 weeks of gestational age is associated with high rate of first trimester pregnancy loss.
 AIM: The study was aimed to evaluate the role of embryonic heart rate (EHR) of early pregnancies as predictive factor of adverse outcome at end of first trimester of pregnancy.
 Methods: This observational study was conducted in the Department of Obstetrics and Gynecology Zenana Hospital, SMS Medical College, Jaipur. It included 300 pregnant women between 6 weeks to 9 weeks of gestational age attending antenatal OPD. Embryonic heart rate was measured by transvaginal sonography. Embryonic heart rate was classified as slow, if it was fewer than 110 beats/ mint or outcome was measured as occurance of spontaneous pregnancy loss prior to 12 weeks.
 Results: Out of 300 cases, 290 (96.67%) had embryonic heart rate ?100 beats per minutes and 10(3.33%) had embryonic heart rate <100 beats per minutes. Out of these 290, (Embryonic heart rate ?100 beats per minutes), 284 (97.93%) had good prognosis and 6 (2.07%) had abortion. In 10 women (Embryonic heart rate <100 beats per minutes), 3 (30.00%) had good prognosis and 7 (70.00%) had abortion. This observation was statistically significant.
 Conclusion: Slow embryonic heart rate on ultrasonography reduced the success of pregnancy and may lead to abortion.
 Keywords: Embryonic heart rate, Ultrasonography, Early pregnancy loss
Highlights
The earliest proof of a viable pregnancy is obtained when cardiac activity of the embryo can be observed
Slow embryonic heart rate at 6-7 weeks of gestational age is associated with high rate of first trimester pregnancy loss
Slow embryonic heart rate on ultrasonography reduced the success of pregnancy and may lead to abortion
Summary
The earliest proof of a viable pregnancy is obtained when cardiac activity of the embryo can be observed. Slow embryonic heart rate at 6-7 weeks of gestational age is associated with high rate of first trimester pregnancy loss. Methods: This observational study was conducted in the Department of Obstetrics and Gynecology Zenana Hospital, SMS Medical College, Jaipur It included 300 pregnant women between 6 weeks to 9 weeks of gestational age attending antenatal OPD. Embryonic heart rate was classified as slow, if it was fewer than 110 beats/ mint or outcome was measured as occurance of spontaneous pregnancy loss prior to 12 weeks. In 10 women (Embryonic heart rate
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