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Uterine electrical activity and cervical shortening in the midtrimester of pregnancy

Objective: To determine whether a correlation exists between increased uterine electrical activity and cervical length (CL) in the midtrimester of pregnancy. Method: In this case-control study, 312 asymptomatic nulliparous women underwent both uterine electromyographic assessment and ultrasound CL measurement between the 16th and 23rd weeks of a singleton pregnancy. The outcome measure was the difference in ultrasound CL measurement between the women found to have uterine action potentials on electromyography and those who did not. Results: Action potentials were detected in 66 (21.1%) of the 312 women ; and compared with the remainder of the study population, cervical length was significantly shorter in these women (35.7+/-8.9 mm vs 38.8+/-7.9 mm ; P<0.01 by the Mann-Whitney test). Conclusion: Ultrasound CL measurement in the midtrimester was significantly shorter in women with increased uterine electrical activity.

action potentials; cervical length; Midtrimester; transvaginal ultrasound; uterine electrical activity

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