The classification and analysis of cases of uterine inertia are somewhat difficult because the term uterine inertia is indicative of a more or less intangible condition. Inertia of a laboring uterus cannot be established on a time basis, since there are a great many factors which make it a relative rather than an absolute entity. For instance, a primipara delivering herself of an average sized infant, and a multipara giving birth to a small baby after her uterine muscle tone has been impaired by a number of pregnancies closely following each other, might both consume the same length of time in accomplishing a different amount of work. This normal period of time for the first woman to be in labor would be abnormal for the second woman, and it could be said of the latter that she had inertia because her pains were of poor quality in regard to length
TITUS P. UTERINE INERTIA: SUMMARY OF A SERIES OF CASES. JAMA. 1918;71(11):890–893. doi:https://doi.org/10.1001/jama.1918.02600370028011
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