American journal of obstetrics and gynecology · 2004
Prediction of labor in term and preterm pregnancies using non-invasive magnetomyographic recordings of uterine contractions.
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Eswaran Hari, Preissl Hubert, Wilson James D, Murphy Pam, Lowery Curtis L
Аннотация
OBJECTIVE: The purpose of this study was to characterize the noninvasive magnetic field recordings of the uterine electrophysiological activity in patients reporting onset of uterine contractions.
STUDY DESIGN: Transabdominal magnetomyographic (MMG) recordings were performed with the use of the SARA system's 151 primary magnetic sensors (CTF Systems Inc, Coquitlam, British Columbia, Canada). Eleven term and 4 preterm patients participated in the study. On all patients, cervical dilation and outcomes were recorded.
RESULTS: Of 8 patients having a peak MMG activity exceeding 8 pT (pico Tesla), all but 1 delivered within 48 hours of our recordings. Of the 7 patients with peak activity below 8 pT, 5 failed to deliver within 48 hours of the recordings. This observation reflects an increase in the electrophysiologic activity of the myometrium as labor progresses.
CONCLUSION: MMG evaluation provides a new noninvasive method for the prediction of labor. Further studies are in progress to determine the temporal relationship of MMG changes with the onset of labor.
STUDY DESIGN: Transabdominal magnetomyographic (MMG) recordings were performed with the use of the SARA system's 151 primary magnetic sensors (CTF Systems Inc, Coquitlam, British Columbia, Canada). Eleven term and 4 preterm patients participated in the study. On all patients, cervical dilation and outcomes were recorded.
RESULTS: Of 8 patients having a peak MMG activity exceeding 8 pT (pico Tesla), all but 1 delivered within 48 hours of our recordings. Of the 7 patients with peak activity below 8 pT, 5 failed to deliver within 48 hours of the recordings. This observation reflects an increase in the electrophysiologic activity of the myometrium as labor progresses.
CONCLUSION: MMG evaluation provides a new noninvasive method for the prediction of labor. Further studies are in progress to determine the temporal relationship of MMG changes with the onset of labor.