Wikipedia

Labor induction

(Redirected fromInduction of labor)
"Medically induced" redirects here. For the type of coma, seeInduced coma.

Labor inductionis the process or treatment that stimulateschildbirthand delivery. Inducing (starting) labor can be accomplished with pharmaceutical or non-pharmaceutical methods. In Western countries, it is estimated that one-quarter of pregnant women have their labor medically induced with drug treatment.[1]Inductions are most often performed either withprostaglandindrug treatment alone, or with a combination of prostaglandin and intravenousoxytocintreatment.[1]

Labor induction
ICD-9-CM73.0-73.1

Causes

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Commonly accepted medical reasons for induction include:

Induction of labor in those who are either at or after term improves outcomes for newborns and decreases the number ofC-sectionsperformed.[4]

Methods of induction

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Methods of inducing labor include both pharmacological medication and mechanical or physical approaches.[citation needed]

Mechanical and physical approaches can include artificial rupture of membranes or membrane sweeping. Membrane sweeping may lead to more women spontaneously going into labor (and fewer women having labor induction) but it may make little difference to the risk of maternal or neonatal death, or to the number of women havingc-sectionsor spontaneous vaginal births. There are also risks associated with membrane sweeping. The risks include irregular contractions, bleeding, and in 1 out of every 10 women an amniotic sac rupture, which can lead to a formal induction within 24 hours of the rupture if labor hasn't been induced.[5]

The use of intrauterine catheters are also indicated. These work by compressing the cervix mechanically to generate release on prostaglandins in local tissues. There is no direct effect on the uterus. Results from a 2021 systematic review found no differences incesarean deliverynorneonataloutcomes in women with low-risk pregnancies between inpatient nor outpatient cervical ripening.[6]

Medication

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  • Intravaginal,endocervical orextra-amniotic administrationofprostaglandin,such asdinoprostoneormisoprostol.[7]Prostaglandin E2is the most studied compound and with most evidence behind it.[citation needed]A range of different dosage forms are available with a variety of routes possible. The use of misoprostol has been extensively studied but normally in small, poorly defined studies. Only a very few countries have approvedmisoprostolfor use in induction of labor.[citation needed]
  • Intravenous(IV) administration of syntheticoxytocinpreparations is used to artificially induce labor if it is deemed medically necessary.[1]A high dose of oxytocin does not seem to have greater benefits than a standard dose.[8]There are risks associated with IV oxytocin induced labor. Risks include the women having induced contractions that are too vigorous, too close together (frequent), or that last too long, which may lead to added stress on the baby (changes in baby's heart rate) and may require the mother to have an emergencycaesarean section.[1]There is no high quality evidence to indicate if IV oxytocin should be stopped once a woman reaches active labor in order to reduce the incidence of women requiring caesarean sections.[1]
  • Use ofmifepristonehas been described but is rarely used in practice.[9]
  • Relaxinhas been investigated,[10]but is not currently commonly used.
  • mnemonic; ARNOP: Antiprogesterone, relaxin, nitric oxide donors, oxytocin, prostaglandins

Non-pharmaceutical

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  • Membrane sweep, also known as membrane stripping, Hamilton maneuver, or "stretch and sweep". The procedure is carried out by a midwife or doctor as part of an internal vaginal examination. The midwife or doctor inserts lubricated, gloved fingers into the vagina and inserts their index finger into the opening of the cervix or neck of the womb. They then use a circular movement to try to separate the membranes of the amniotic sac, containing the baby, from the cervix. This action, which releases hormones called prostaglandins, may prepare the cervix for birth and may initiate labour.[11]While this process can cause discomfort, bleeding, and irregular contractions and carries the risk of breaking the amniotic sack,[12]many would still choose to have membrane sweeping carried out for their next birth.[5]
  • Artificial rupture of the membranes(AROM or ARM) ( "breaking the waters" )
  • Extra-amniotic saline infusion (EASI),[13]in which aFoley catheteris inserted into thecervixand the distal portion expanded to dilate it and to release prostaglandins.
  • Cook Medical Double Balloon known as the Cervical Ripening Balloon with Stylet for assisted placement is FDA approved. The Double balloon provides one balloon to be inflated with saline on one side of the Uterine side of the cervix and the second balloon to be inflated with saline on the vaginal side of the cervix.

When to induce

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TheAmerican Congress of Obstetricians and Gynecologistshas recommended against elective induction before 39 weeks if there is no medical indication and the cervix is unfavorable.[14]One recent study indicates that labor induction at term (41 weeks) or post-term reduces the rate ofcaesarean sectionby 12%, and also reduces fetal death.[15] Some observational/retrospective studies have shown that non-indicated, elective inductions before the 41st week of gestation are associated with an increased risk of requiring a caesarean section.[14]Randomized clinical trials have not addressed this question. However, researchers have found that multiparous women who undergo labor induction without medical indicators are not predisposed to caesarean sections.[16]Doctors and pregnant women should have a discussion of risks and benefits when considering an induction of labor in the absence of an accepted medical indication.[14]There is insufficient evidence to determine if inducing a woman's labor at home is a safe and effective approach for both the women and the baby.[17]

Studies have shown a slight increase in risk of infant mortality for births in the 41st and particularly 42nd week of gestation, as well as a higher risk of injury to the mother and child.[18]Due to the increasing risks of advanced gestation, induction appears to reduce the risk for caesarean delivery after 41 weeks' gestation and possibly earlier.[15][19]Inducing labour after 41 weeks of completed gestion is likely to reduce the risk ofperinatal deathandstillbirthcompared with waiting for labour to start spontaneously.[20]

Although there has been a recorded increase in the risk of perinatal death and stillbirth after 41 weeks of gestation, this risk is small. In fact, a study conducted in 2012 examined stillbirth rates in the state of California, and excluded babies with genetic or congenital problems. The study determined that the risk of stillbirth per 1000 births after 40, 41 and 42 weeks of gestation were 0.42, 0.61 and 1.08, respectively.[21] Thus, it is important to acknowledge the probabilistic evidence when discussing formal medical inductions, because it highlights the how small the likelihood of having a stillbirth post-term is.

Inducing labor before 39 weeks in the absence of a medical indication (such as hypertension, IUGR, or pre-eclampsia) increases the risk of complications of prematurity including difficulties with respiration, infection, feeding,jaundice,neonatal intensive care unitadmissions, and perinatal death.[22]

Inducing labour after 34 weeks and before 37 weeks in women with hypertensive disorders (pre-eclampsia,eclampsia,pregnancy-induced hypertension) may lead to better outcomes for the woman but does not improve or worsen outcomes for the baby.[23]More research is needed to produce more certain results.[23]If waters break (membranes rupture) between 24 and 37 weeks'gestation,waiting for the labour to start naturally with careful monitoring of the woman and baby is more likely to lead to healthier outcomes.[24]For women over 37 weeks pregnant whose babies are suspected of not coping well in the womb, it is not yet clear from research whether it is best to have an induction or caesarean immediately, or to wait until labour happens by itself.[25]Similarly, there is not yet enough research to show whether it is best to deliver babies prematurely if they are not coping in the womb or whether to wait so that they are less premature when they are born.[26]

Clinicians assess the odds of having a vaginal delivery after labor induction by a "Bishop score".However, recent research has questioned the relationship between the Bishop score and a successful induction, finding that a poor Bishop score actually may improve the chance for a vaginal delivery after induction.[15]A Bishop Score is done to assess the progression of the cervix prior to an induction. In order to do this, the cervix must be checked to see how much it has effaced, thinned out, and how far dilated it is. The score goes by a points system depending on five factors. Each factor is scored on a scale of either 0–2 or 0–3, any total score less than 5 holds a higher risk of delivering by caesarean section.[27]

Sometimes when a woman's waters break after 37 weeks she is induced instead of waiting for labour to start naturally.[28]This may decrease the risks of infection for the woman and baby but more research is needed to find out whether inducing is good for women and babies longer term.[28]

Women who have had a caesarean section for a previous pregnancy are at risk of having auterine rupture,when their caesarean scar re-opens.[29]Uterine rupture is very serious for the woman and the baby, and induction of labour increases this risk further.[29]There is not yet enough research to determine which method of induction is safest for a woman who has had a caesarean section before.[29]There is also no research to say whether it is better for these women and their babies to have an elective caesarean section instead of being induced.[30]

Criticisms of induction

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Membrane sweeping, a common method of labor induction, can cause bleeding and irregular contractions and is often done without informed consent by the pregnant person.[31]

The medical rationale for performing an induction is decreasing the risk of stillbirth. However, as mentioned in the above section, the probability of having a stillbirth post-term is very small, meaning that for the vast majority of post-term pregnancies, inductions are unnecessary. Approximately 500 inductions are performed in order to avoid 1 stillbirth.[32]Many of these unnecessary inductions could potentially provoke other risks, forcing medical practitioners to perform other interventions such as caesarean sections. These additional interventions could cause labor to be more risky for the pregnant person.

Another criticism of inductions is that the pregnant person's bodily autonomy is overlooked. Many pregnant people might not want to be induced, and rather share in the decision-making process with their medical practitioner.[33]

Induced labor may be more painful for the woman as one of the side effects of intravenous oxytocin is increased contraction pains, mainly due to the rigid onset.[34]This may lead to the increased use ofanalgesicsand other pain-relieving pharmaceuticals.[35]These interventions may also lead to an increased likelihood ofcaesarean sectiondelivery for the baby.[36]However, studies into this matter show differing results. One study indicated that while overall caesarean section rates from 1990 to 1997 remained at or below 20 per cent, elective induction was associated with a doubling of the rate of Caesarean section.[37]Another study showed that elective induction in women who were not post-term increased a woman's chance of a C-section by two to three times.[38]A more recent study indicated that induction may increase the risk of caesarean section if performed before the 40th week of gestation, but it has no effect or actually lowers the risk if performed after the 40th week.[39][40]

A 2014 systematic review and meta analysis on the subject of induction and its effect on cesarean section indicate that after 41 weeks of gestation there is a reduction of cesarean deliveries when the labour is induced.[15][41]

The Institute for Safe Medication Practices labeledpitocina "high-alert medication" because of the high likelihood of "significant patient harm when it is used in error."[42]

See also

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References

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  1. ^abcdeBoie S, Glavind J, Velu AV, Mol BW, Uldbjerg N, de Graaf I, Thornton JG, Bor P, Bakker JJ (2018-08-20)."Discontinuation of intravenous oxytocin in the active phase of induced labour".The Cochrane Database of Systematic Reviews.2018(8): CD012274.doi:10.1002/14651858.CD012274.pub2.PMC6513418.PMID30125998.
  2. ^Allahyar, J. & Galan, H. "Premature Rupture of the Membranes."; also American College of Obstetrics and Gynecologists.
  3. ^Grobman, William A.; Rice, Madeline M.; Reddy, Uma M.; Tita, Alan T.N.; Silver, Robert M.; Mallett, Gail; Hill, Kim; Thom, Elizabeth A.; El-Sayed, Yasser Y.; Perez-Delboy, Annette; Rouse, Dwight J.; Saade, George R.; Boggess, Kim A.; Chauhan, Suneet P.; Iams, Jay D.; Chien, Edward K.; Casey, Brian M.; Gibbs, Ronald S.; Srinivas, Sindhu K.; Swamy, Geeta K.; Simhan, Hyagriv N.; Macones, George A.. (2018). Labor Induction versus Expectant Management in Low-Risk Nulliparous Women. New England Journal of Medicine, 379(6), 513–523. doi:10.1056/NEJMoa1800566
  4. ^Mishanina E, Rogozinska E, Thatthi T, Uddin-Khan R, Khan KS, Meads C (Jun 10, 2014)."Use of labour induction and risk of cesarean delivery: a systematic review and meta-analysis".CMAJ: Canadian Medical Association Journal.186(9): 665–73.doi:10.1503/cmaj.130925.PMC4049989.PMID24778358.
  5. ^abFinucane EM, Murphy DJ, Biesty LM, Gyte GM, Cotter AM, Ryan EM, Boulvain M, Devane D (27 February 2020)."Membrane sweeping for induction of labour".The Cochrane Database of Systematic Reviews.2(2): CD000451.doi:10.1002/14651858.CD000451.pub3.PMC7044809.PMID32103497.
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  19. ^Caughey AB, Sundaram, V, Kaimal, AJ, Gienger, A, Cheng, YW, McDonald, KM, Shaffer, BL, Owens, DK, Bravata, DM (Aug 18, 2009). "Systematic review: elective induction of labor versus expectant management of pregnancy".Annals of Internal Medicine.151(4): 252–63, W53-63.doi:10.7326/0003-4819-151-4-200908180-00007.PMID19687492.
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  34. ^National Institute for Health and Clinical Excellence, "CG70 Induction of labour: NICE guideline","CG70 - Induction of labour - Introduction - National Institute for Health and Clinical Excellence".Archived fromthe originalon 2012-04-22.Retrieved2012-04-10.July 2008, retrieved 2012-04-10
  35. ^Vernon, David,Having a Great Birth in Australia,Australian College of Midwives,2005,ISBN0-9751674-3-X
  36. ^Roberts Christine L, Tracy Sally, Peat Brian (2000)."Rates for obstetric intervention among private and public patients in Australia: population based descriptive study".British Medical Journal.321(7254): 137–41.doi:10.1136/bmj.321.7254.137.PMC27430.PMID10894690.
  37. ^Yeast John D (1999). "Induction of labor and the relationship to caesarean delivery: A review of 7001 consecutive inductions".American Journal of Obstetrics and Gynecology.180(3): 628–33.doi:10.1016/S0002-9378(99)70265-6.PMID10076139.[permanent dead link]
  38. ^Simpson Kathleen R., Thorman Kathleen E. (2005). "Obstetric 'Conveniences' Elective Induction of Labor, Cesarean Birth on Demand, and Other Potentially Unnecessary Interventions".Journal of Perinatal and Neonatal Nursing.19(2): 134–44.doi:10.1097/00005237-200504000-00010.PMID15923963.S2CID19239366.
  39. ^Caughey AB, Nicholson JM, Cheng YW, Lyell DJ, Washington E (2006)."Induction of labor and caesarean delivery by gestational age".Am Journal of Obstetrics and Gynecology.195(3): 700–705.doi:10.1016/j.ajog.2006.07.003.PMID16949399.
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  41. ^Caughey A. (8 May 2013)."Induction of labour: does it increase the risk of cesarean delivery?".BJOG.121(6): 658–661.doi:10.1111/1471-0528.12329.PMID24738892.S2CID33295368.
  42. ^The Institute for Safe Medication PracticesResults Of ISMP Survey On High-Alert Medications: Differences Between Nursing, Pharmacy, And Risk/Quality/Safety PerspectivesISMP.org. Retrieved 2017-01-09.
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