External tachodynamometer has frequently been used to evaluate premature labor. In three cases, the patient was apparently able to record uterine contraction-like curves by means of abdominal pressure. In two of these cases, the patient was evidently using this manipulation to gain attention and support from her husband and/or family members. In the third case, described in this paper, because false curves were recorded, an emergency Caesarean section was performed under the impression that abruptio placenta had occurred.
Lee, Chang Y. and Lau, Michael P. H.
"Manipulation of External Tachodynamometer by the Patient: Case Report,"
Henry Ford Hospital Medical Journal
: Vol. 31
Available at: https://scholarlycommons.henryford.com/hfhmedjournal/vol31/iss3/11