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. 2019 Dec 16;19:501. doi: 10.1186/s12884-019-2660-5

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© The Author(s). 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Illustrates coincidence between the maternal heart rate (faint line) and presumed fetal heart rate. After application of a fetal scalp electrode, the true fetal heart rate becomes apparent. Reprinted from American Journal of Obstetrics and Gynecology, https://www.sciencedirect.com/journal/american-journal-of-obstetrics-and-gynecology, Vol 198, Issue 6, June 2008, Pages 717–24, Neilson DR, Freeman RK, Mangan S. Signal ambiguity resulting in unexpected outcome with external fetal heart rate monitoring.© 2008, with permission from Elsevier