![]() The heart rate during 6-8 weeks' gestation is associated with fetal outcome at the end of the first trimester and identifies those embryos that are in jeopardy. Embryos with heart rates below 85 beats/ min during 6-8 weeks' gestation did not survive. kelleylk If the doc says its ok, then try not to worry about it. The baby measured 6 weeks 4 days and heart rate is 122. ![]() A highly significant (p < 0.01) linear decrease was seen in fetal losses with increasing gestational age. ryaroberts Mine was 128bpm at 6wk5days cheller134 member Mine was 104 at 5w6ds. In groups 3 and 4, a heart rate of 146 beats/min or more was associated with the fewest losses (5.5% and 3.3%, respectively). A heart rate between 116 and 125 beats/min was associated with the fewest losses in groups 1 (10.8% losses) and 2 (8.6%). Statistically significant differences (p < 0.01) in the mean heart rates were seen between all groups. M-mode sonography was used to calculate the embryonic heart rate as the mean of at least 3 waves in beats/minute. Gestational age was calculated from the known date of the beginning of the last menstrual period and was confirmed by sonographic measurement of the crown-rump length. The average heart rate for baby boys in the first trimester was 154.9 bpm (plus or minus 22.8 bpm) and for baby girls it was 151.7 bpm (plus or minus 22.7 bpm). We prospectively studied 2,164 singleton pregnancies between 19. We also tried to determine the lower limit of the heart rate associated with a favorable outcome for each group. We attempted to identify embryonic heart rates at 4 stages during 6-8 weeks' gestation and to relate our findings to fetal outcome at the end of the first trimester. Heart rates in embryos (6-8 weeks' gestation) have rarely been studied.
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