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- 10:21, 12 October 2009 S8600021 talk contribs uploaded File:Week17 fetal heart rate.flv ( Early ultrasonographic measurement of embryonic heart rate (EHR) shows a steady increase from Stage 9-10 (75 beats/minute) to Stage 18 (130 beats/minute) and on to Stage 20, following which a gradual decrease in EHR occurs. This increase correlates with )