Sometime ending any pregnancy – but during this time the uterus is working, initially unnoticed, hard to their task: the birth. How do “know” the uterus the right time for a certain type of labor?
The uterus begins to practice already months before the birth of the day “X”. So-called gestational or practice contractions are detectable from the 20th week. The uterus shrinks up to three times painless even at this early stage of per hour. Many mothers describe this labor as a kind of pressure in the abdomen, a feeling as the blood in the direction of the head would pressed.
Vorwehen, lower labor, body pains…
Later, in the last weeks and days until the birth, start the Vorwehen. They are painless and irregular, but hardly go unnoticed. They have important functions: lowering labor can “slide” the belly down, body pains anchor baby’s head in the pool. So it waits for ready to start on his big day. Follow Ezinereligion for maternity clothing. Opening labor start also often equally painful. A drawing in the cross, a pressure in the pelvic or abdominal cavity – so the early opening pains are often described. But they are regularly and increase in intensity.
Exorcising labor to initiate the actual birth. You are almost all mothers as fierce, but the pain is more easily bearable because the pressing urge allows the woman to work with – the baby is born! Finally, follow still help postpartum contractions that expel the placenta. They are less intense and almost painless. Aftermath in the puerperium accompany the regression of the uterus and sometimes almost go unnoticed.
What pains when…?
How do “know” the uterus the right time for a certain type of labor?
A research group of the Australian University of Newcastle under the direction of Roger Smith seems to have moved the answer to these questions a little closer. The researchers demonstrated hormone – corticotropin releasing in the hormone CRH – Planzenta, that is found only in pregnant women outside of the brain.
Is this Messenger substance depending on the progression of pregnancy in different concentrations: it seems, CRH is the hormone-watch the birth. Roger Smith studied 500 women in the 16-20th week of pregnancy and the values compared to the later date of birth. He could demonstrate a clear relationship: CHR elevated levels indicates a premature birth, a low concentration on a delayed start of the birth.
Also Joseph Mazoub of Harvard is dedicated to University, intensive CRH research. He believed that the hormone acts in two different ways, and so ensures that the birth date corresponds to the degree of maturity of the baby.
On the one hand CRH encourages the adrenal cortex of the babies to make DHEAS Dehydroepiandrosterone sulfate -. This steroid through blood circulation again in the Platzenta back and can be synthesized from it to estrogen that – gives the signal for the beginning of birth pangs of the uterus together with other hormones -. On the other hand, CRH stimulates the child’s adrenal also to form cortisol, which promotes the maturation of body, especially the lungs of.
What does cortisol…?
Women in which a premature birth is to fear, get most cortisol as “Lung maturation injection” prescribed by the doctor, so that the lungs of the babies at a possible premature birth has developed something. Cortisol itself causes but also the placenta to make even more CRH; the preparation for childbirth is accelerated so.
CRH should be also the reason for the fact that extreme stress triggers preterm births in some women. The stress hormone adrenalin can be made only with the participation of CRH. Elevated CRH levels is measured in a pregnant woman, doctors and midwives to monitor the contractions of the uterus before birth especially carefully. Most preterm can be stopped through relaxation or even medicines.
The CTG makes visible the contractions
At the end of pregnancy, at least at birth, almost all mothers make acquaintance with a special device: the CTG – Cardiotokogramm – records contractions and heart activity of the baby on a paper strip (see picture above). Two measuring heads are attached with a strap or a bandage on the belly of the mother, they give the impetus to two writers. Over a loudspeaker, you can also listen as the heart of the baby works. CTG curves by 20 minutes can doctors and midwives not only interpret how the baby’s doing – whether it sleeps, plays, under stress or has problems – but also read the history, the strength and frequency of contractions.
Many postpone are unsure whether they determined in time perceive the signs of childbirth; Finally, the uterus works through Yes the entire pregnancy! But the fear of “confuse shrubbery” is usually unfounded: the cascade triggered by the hormone-clock also tells of the woman: “Now it’s so far!”