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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. 2 — CTG tracing immediately prior to delivery of a stillborn infant. CTG tracings in early labor were normal and it seems likely that the CTG monitoring switched from recording the fetal heart rate to recording the maternal heart rate, although the exact transition point is difficult to determine. 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