Dynamic changes in the myometrium during the third stage of labor, evaluated using two-dimensional ultrasound, in women with normal and abnormal third stage of …
M Patwardhan, E Hernandez-Andrade, H Ahn… - Gynecologic and …, 2015 - karger.com
Gynecologic and obstetric investigation, 2015•karger.com
Objective: To investigate dynamic changes in myometrial thickness during the third stage of
labor. Methods: Myometrial thickness was measured using ultrasound at one-minute time
intervals during the third stage of labor in the mid-region of the upper and lower uterine
segments in 151 patients including: women with a long third stage of labor (n= 30),
postpartum hemorrhage (n= 4), preterm delivery (n= 7) and clinical chorioamnionitis (n= 4).
Differences between myometrial thickness of the uterine segments and as a function of time …
labor. Methods: Myometrial thickness was measured using ultrasound at one-minute time
intervals during the third stage of labor in the mid-region of the upper and lower uterine
segments in 151 patients including: women with a long third stage of labor (n= 30),
postpartum hemorrhage (n= 4), preterm delivery (n= 7) and clinical chorioamnionitis (n= 4).
Differences between myometrial thickness of the uterine segments and as a function of time …
Abstract
Objective: To investigate dynamic changes in myometrial thickness during the third stage of labor. Methods: Myometrial thickness was measured using ultrasound at one-minute time intervals during the third stage of labor in the mid-region of the upper and lower uterine segments in 151 patients including: women with a long third stage of labor (n = 30), postpartum hemorrhage (n = 4), preterm delivery (n = 7) and clinical chorioamnionitis (n = 4). Differences between myometrial thickness of the uterine segments and as a function of time were evaluated. Results: There was a significant linear increase in the mean myometrial thickness of the upper uterine segments, as well as a significant linear decrease in the mean myometrial thickness of the lower uterine segments until the expulsion of the placenta (p < 0.001). The ratio of the measurements of the upper to the lower uterine segments increased significantly as a function of time (p < 0.0001). In women with postpartum hemorrhage, preterm delivery, and clinical chorioamnionitis, an uncoordinated pattern among the uterine segments was observed. Conclusion: A well-coordinated activity between the upper and lower uterine segments is demonstrated in normal placental delivery. In some clinical conditions this pattern is not observed, increasing the time for placental delivery and the risk of postpartum hemorrhage.
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