2013
DOI: 10.1111/aogs.12190
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Electrohysterography of labor contractions: propagation velocity and direction

Abstract: Labor contractions, expressed by electrohysterographic signals, propagate both in the downward and upward direction, a phenomenon that must be taken into account when determining the propagation velocity for preterm labor diagnostics.

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Cited by 32 publications
(30 citation statements)
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“…The estimated velocities are comparable to those reported in other EHG studies [22], [23], [30] but with a smaller intra- and inter-patient variation. While other studies report that the estimated velocities are within the physiological expected range, we must stress the fact that, to our knowledge, no previous studies have measured the propagation velocity of electrical signals directly on the human myometrium.…”
Section: Discussionsupporting
confidence: 86%
“…The estimated velocities are comparable to those reported in other EHG studies [22], [23], [30] but with a smaller intra- and inter-patient variation. While other studies report that the estimated velocities are within the physiological expected range, we must stress the fact that, to our knowledge, no previous studies have measured the propagation velocity of electrical signals directly on the human myometrium.…”
Section: Discussionsupporting
confidence: 86%
“…Based on our present observations, EMG signals preceding myometrial contractions in the pig’s uterus are propagated relatively uniformly in both cervico-tubal and tubo-cervical directions. This is in agreement with the results of myoelectrical burst analyses in women where both upward and multidirectional propagation patterns have been reported [33, 34]. This “mixed” propagation pattern may serve to facilitate sperm transport along the uterine horns and/or re-distribution of semen throughout the two horns in the case of unilateral deposition of semen [35].…”
Section: Discussionsupporting
confidence: 89%
“…All authors recorded myometrial activity directly within the myometrium (EMG) [22, 28, 29, 30, 31] or used intrauterine pressure (IUP) [27]. An alternative method for monitoring the uterine activity based on surface EMG—EHG (electrohysterogram) allowed to application from 3 [32] to 16 [33] and 64 [20] active electrodes located on abdomen skin. The needle EMG picked up the bioelectrical signal directly associated with the muscular activity of myometrium, while EHG collected signal abundant in noise generated between cells and electrodes.…”
Section: Discussionmentioning
confidence: 99%
“…However, there is a significant doubt that myometrial action potentials travel in straight paths. In sheep (Parkington et al 1988), rodent ( Lammers et al 2008), and human (Mikkelsen et al 2013, Rabotti & Mischi 2015 action potentials are not found to travel linearly. The highest resolution electrical mapping of myometrium is in the guinea pig, which reveals that action potentials diverge and loop through tortuous paths, self-terminate, and usually do not propagate more than a few centimeters (Lammers et al 2008) (Fig.…”
Section: Problems With Action Potential Propagation As a Mechanism Fomentioning
confidence: 89%