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Unformatted text preview: Theories of Labor Onset 1. Uterine stretch theory any hallowed organ when stretched to its maximum capacity will contrast and empty. 2. Oxytocin theory Oxytocin, which causes contractions of the smooth muscles of the posterior pituitary gland as a result of stressful event in labor. 3. Progesterone Deprivation Theory Progesterone, secreted by the corpus Luteum and then by the placenta, is essential in maintaining pregnancy. However, the decrease in the level of progesterone circulating in the body will initiate body pains. 4. Prostaglandin Theory Prostaglandins, formed by the uterine deciduas under level of concentration in the amniotic fluid and blood of women increases during labor. Research has shown prostaglandin to be very effective in inducing uterine contraction at any stage of gestation. Initiation of labor is said to be the result of the release of arachidonic acid is believed to increase prostaglandin synthesis contractions. 5. Theory of Aging Placenta as the placenta matures, blood supply decreases resulting in uterine contractions. Related Terms: Labor is the process of moving the fetus, placenta and membranes out of the uterus and through the birth canal. Synonymous with childbirth and parturition. Delivery is the actual birth of baby Crowning encircling of the largest diameter of the babys head by the vulvar ring Effacement shortening and thinning of the cervical canal. It is expressed in percentage (%). Dilatation is the enlargement of the cervical os from an orifice a few millimeters in size to an aperture large enough to permit the passage of the fetus. Show is a mucoid discharge from the cervix that is present after the mucous plug has been discharged. Attitude the relationship of the fetal parts to one another Lie relationship of the fetal spine to the spine of the mother. Presentation portion of the fetus that enters the pelvis first. Position relationship of the assigned area of the presenting part of the landmark of the material pelvis. Station measurement of the progress of descent of the presenting part in relation to the ischial spine. Frequency from the beginning of one contraction to the beginning of the next contraction Duration from the beginning of contraction to its completion Intensity the strength of contraction to its completion Effacement progressive thinning and shortening of the cervix Dilatation opening of the cervix os during labor SIGNS of LABOR Preliminary/Prodromal Signs of Labor 1. Ligthening setting of fetal head into pelvic brim occurs approximately 10-14 days before labor begins gives the woman relief from diaphragmatic pressure and shortness of breath occurs early in primiparas mother may experience: shooting leg pains from the increased pressure on the sciatic nerve, increased amounts of vaginal discharge and urinary frequency from...
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This note was uploaded on 05/16/2011 for the course NURSING 112 taught by Professor Brinley during the Spring '11 term at Pace.
- Spring '11