Mechanism of initiation of labor: Many theories have been proposed over the years. mechanical theory Endocritic theory Neurological medium theory
Mechanism of initiation of labor: Many theories have been proposed over the years. ❖ mechanical theory ❖ Endocritic theory ❖ Neurological medium theory
Essential factors of labor There are four factors that influence the progress and final outcome of labor. powers (the contractions or forces of the uterus) passage (the bony and soft tissues of the maternal pelvis) passenger (the fetus) psyche
Essential factors of labor There are four factors that influence the progress and final outcome of labor. ❖ powers (the contractions or forces of the uterus) ❖ passage (the bony and soft tissues of the maternal pelvis) ❖ passenger (the fetus) ❖ psyche
The powers: The uterine contraction: It is the main power during labor and last for the whole puerperal process.It can make the effacement and dilatation of the cervix. accompanied the descent of the fetal presenting part.It also can make the fetus and placenta expulse
The powers: ❖ The uterine contraction: It is the main power during labor and last for the whole puerperal process. It can make the effacement and dilatation of the cervix, accompanied the descent of the fetal presenting part. It also can make the fetus and placenta expulse
The characters of the uterine contraction: rhythmic Progressive Polar Recessive period period period 一 Interval contraction contraction contraction
The characters of the uterine contraction: ❖rhythmic Recessive period Progressive period Polar period contraction contraction Interval contraction
The characters of the uterine contraction: symmetrical and polar
The characters of the uterine contraction: ❖symmetrical and polar