Prolonged labor is one of the causes of maternal and infant mortality. Prolonged labor is labor that lasts more than 18 hours starting from the signs of labor. The side-lying position is a position that can help the fetal head descend. sim position, tilted to the left or right according to the doctor's or midwife's advice. In addition to doing a tilted position, one effort to speed up the process of the first stage. The purpose of this study was to determine the effectiveness of the left tilt for the progress of the first stage of labor in the active phase. The method in this study was quasi-experimental. The sample in this study were primigravida mothers giving birth in the delivery room of Manembo-nemo Hospital, Bitung City with a sample size of 40 respondents. The instrument of this study was using a partograph sheet. The test data analysis used an independent t-test. The results of this study. The results of this study showed that 75.0% of respondents in the first stage of labor were in the left lateral position with a labor duration of <6 hours, namely 211.70 minutes (3.52 hours), and 50% of respondents in the first stage of labor who did not lie on the left lateral position had a labor duration of less than 6 hours, namely 323.25 minutes (5.38 hours). The results of the independent t-test obtained p = 0.023, indicating that the left lateral position was more effective than mothers who did not lie on the left lateral position in accelerating the active phase of first stage labor. It can be concluded that the left lateral position is more effective for mothers in the first stage of labor compared to mothers who did not lie on the left lateral position.
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