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What is the peak intensity of uterine contractions in a normal patient in spontaneous active labour?

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What is the peak intensity of uterine contractions in a normal patient in spontaneous active labour?

(a) 0 to 35 mm Hg

(b) 50 to 75 mm Hg

(c) 90 to 120 mm Hg

(d) 120 to 150 mm Hg

The question was posed to me in examination.

My question comes from Ear Oximeter topic in portion Oximeters of Biomedical Instrumentation

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Right choice is (b) 50 to 75 mm Hg

For explanation: During labour, the uterus muscle starts contractions of increasing intensity in a bid to expel out the child. The intrauterine pressure can reach values of 150 mmHg or more during the expulsion period. However, a normal patient in spontaneous active labour will demonstrate uterine contractions occurring at intervals of three to five minutes, with a duration of 30 to 70 s and a peak intensity of 50 to 75 mmHg.

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