How Is Personal Lubricant Cleaned Out Of The Cervix
Am Fam Physician. 2003 May 15;67(10):2123-2128.
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Article Sections
- Abstract
- Nonpharmacologic Cervical Ripening
- Pharmacologic Cervical Ripening or Labor Induction
- References
Induction of labor is common in obstetric do. According to the most current studies, the rate varies from 9.5 to 33.7 percentage of all pregnancies annually. In the absence of a ripe or favorable cervix, a successful vaginal nascency is less probable. Therefore, cervical ripening or preparedness for induction should be assessed before a regimen is selected. Cess is achieved by calculating a Bishop score. When the Bishop score is less than six, information technology is recommended that a cervical ripening agent exist used earlier labor induction. Nonpharmacologic approaches to cervical ripening and labor consecration have included herbal compounds, castor oil, hot baths, enemas, sexual intercourse, chest stimulation, acupuncture, acupressure, transcutaneous nervus stimulation, and mechanical and surgical modalities. Of these nonpharmacologic methods, just the mechanical and surgical methods have proven efficacy for cervical ripening or induction of labor. Pharmacologic agents available for cervical ripening and labor induction include prostaglandins, misoprostol, mifepristone, and relaxin. When the Bishop score is favorable, the preferred pharmacologic agent is oxytocin.
Labor is a process through which the fetus moves from the intrauterine to the extrauterine surroundings. It is a clinical diagnosis defined every bit the initiation and perpetuation of uterine contractions with the goal of producing progressive cervical effacement and dilation. The exact mechanisms responsible for this procedure are currently non well understood.one Induction of labor refers to the process whereby uterine contractions are initiated by medical or surgical means before the onset of spontaneous labor.
Over the past few years, there has been an increasing sensation that if the cervix is unfavorable, a successful vaginal birth is less probable. Various scoring systems for cervical assessment have been introduced. In 1964, Bishop systematically evaluated a group of multiparous women for constituent induction and developed a standardized cervical scoring system. The Bishop score (Tabular array one)1 helps delineate patients who would exist most probable to accomplish a successful induction. The duration of labor is inversely correlated with the Bishop score; a score that exceeds viii describes the patient nearly probable to achieve a successful vaginal nascency. Bishop scores of less than 6 ordinarily require that a cervical ripening method be used earlier other methods.2–4
TABLE ane
Bishop Score
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Nonpharmacologic Cervical Ripening
- Abstruse
- Nonpharmacologic Cervical Ripening
- Pharmacologic Cervical Ripening or Labor Induction
- References
HERBAL SUPPLEMENTS
Given rapid growth in the herbal-supplement manufacture, it is not surprising that patients asking information most alternative agents for labor induction. Commonly prescribed agents include evening primrose oil, black haw, black and blue cohosh, and red raspberry leaves. Although evening primrose oil is the remedy most normally used by midwives,five information technology is unclear whether this substance tin ripen the cervix or induce labor. Black haw, which has been described as having a uterine tonic issue,vi has been used to ready women for labor. Black cohosh has a similar mechanism of activity, while blue cohosh may stimulate uterine contractions. Red raspberry leaves are used to raise uterine contractions in one case labor is initiated. The risks and benefits of these agents are still unknown because the quality of evidence is based on a long tradition of use by a certain population6 and anecdotal case reports. The but decision that can exist fabricated at this time is that the part of herbal remedies in cervical ripening or labor induction is still uncertain.7
CASTOR OIL, HOT BATHS, AND ENEMAS
Brush oil, hot baths, and enemas also accept been recommended for cervical ripening or labor induction. The mechanisms of activity for these methods are unknown. Review of the literature indicates that one poorly designed study involving 100 participants studied castor oil versus no handling. While there did non appear to be any divergence in obstetric or neonatal outcomes, all women ingesting the castor oil reported being nauseated. At this fourth dimension, no evidence supports the utilise of these 3 modalities as viable methods for cervical ripening or labor consecration.vii,8
SEXUAL INTERCOURSE
Sexual intercourse is commonly recommended for promoting labor initiation. Sexual relations usually involve stimulation of the breasts and nipples, which can promote the release of oxytocin. With penetration, the lower uterine segment is stimulated. This stimulation results in a local release of prostaglandins. Female orgasms have been shown to include uterine contractions, and human semen contains prostaglandins, which are responsible for cervical ripening. Only ane study of 28 women resulted in minimally useful data, and so the role of sexual intercourse every bit a method of promoting labor initiation remains uncertain.7,9 [Reference9—Evidence level B, systematic review of nonrandomized controlled trials)]
BREAST STIMULATION
Chest massage and nipple stimulation accept been shown to facilitate the release of oxytocin from the posterior pituitary gland. The nearly commonly prescribed technique involves gently massaging the breasts or applying warm compresses to the breasts for one hour, three times a day. Oxytocin is released, and studies have demonstrated an aberrant fetal heart rate (FHR) tracing like to that occurring in oxytocin claiming testing in higher-risk pregnancies. This abnormal rate may exist acquired by a reduction in placental perfusion and fetal hypoxia.seven Ii poorly designed studies conducted in the 1970s and 1980s demonstrated a difference in the intervention groups, merely the poor study design suggests that evidence is lacking to support chest stimulation as a feasible method of inducing labor.7
ACUPUNCTURE/TRANSCUTANEOUS Nervus STIMULATION
Acupuncture involves the insertion of very fine needles into designated locations with the purpose of preventing or curing disease. In the Chinese system of medicine, it is thought that acupuncture stimulates channels of qi (pronounced "chee"), or energy. This energy flows along 12 meridians, with designated points along these meridians. Each point is given a name and a number and is associated with a specific organ organization or function.10
In Western medicine, it is idea that acupuncture and transcutaneous nerve stimulation (TENS) may stimulate the release of prostaglandins and oxytocin. Almost of the studies involving acupuncture were poorly designed and do non run across the rigorous criteria for analysis set forth past the Cochrane reviewers. A well-designed randomized controlled trial (RCT) is needed to evaluate the part of acupuncture and TENS in labor consecration.11 [Evidence level B, systematic review of non-RCTs]
MECHANICAL MODALITIES
All mechanical modalities share a similar mechanism of action—namely, some grade of local force per unit area that stimulates the release of prostaglandins.1 The risks associated with these methods include infection (endometritis and neonatal sepsis accept been associated with natural osmotic dilators), bleeding, membrane rupture, and placental disruption.
Hygroscopic dilators absorb endocervical and local tissue fluids, causing the device to aggrandize within the endocervix and providing controlled mechanical pressure. The products available include natural osmotic dilators (e.g., Laminaria japonicum) and constructed osmotic dilators (e.g., Lamicel). The principal advantages of using hygroscopic dilators include outpatient placement and no FHR-monitoring requirements. The technique for placing hygroscopic dilators is described in Table ii.7
Tabular array 2
Technique for Insertion of Hygroscopic Dilators
| The perineum and vagina are prepped with antiseptic. |
| Using a sterile speculum examination to visualize the cervix, the dilator is introduced into the endocervix, allowing the "tails" to fall into the vagina. |
| Dilators are progressively placed until the endocervix is "total." The number of dilators used is noted in the medical record. |
| A sterile gauze pad is placed in the vagina to maintain the position of the dilators. |
Balloon devices provide mechanical pressure level directly on the cervix as the airship is filled. A Foley catheter (26 Fr) or specifically designed airship devices can be used. The technique is described in Table 3.seven,12–15
TABLE 3
Technique for Placement of Airship Dilators
| The catheter is introduced into the endocervix by direct visualization or blindly past locating the cervix with the examining fingers and guiding the catheter over the paw and fingers through the endocervix and into the potential space between the amniotic membrane and the lower uterine segment. | ||
| The airship reservoir is inflated with 30 to fifty mL of normal saline. | ||
| The airship is retracted so that it rests on the internal os. | ||
| Additional steps that may exist taken:
|
Currently, several RCTs are comparing use of a balloon device with administration of an actress-amniotic saline infusion, laminaria, or prostaglandin Etwo (PGE2). Results from these trials indicate that each of these methods is constructive for cervical ripening and each has comparable cesarean-department commitment rates in women with an unfavorable neck.12–14,16–18 [References12 through14,16, and17—Prove level A, RCT]
SURGICAL METHODS
Stripping of the Membranes
Stripping of the membranes causes an increase in the activity of phospholipase Atwo and prostaglandin F2α (PGF2α) as well as causing mechanical dilation of the cervix, which releases prostaglandins. The membranes are stripped past inserting the examining finger through the internal cervical os and moving it in a circular management to detach the inferior pole of the membranes from the lower uterine segment.7,xix [Reference9—Evidence level C, consensus opinion] Risks of this technique include infection, haemorrhage, accidental rupture of the membranes, and patient discomfort. The Cochrane reviewers ended that stripping of the membranes lonely does not seem to produce clinically important benefits, just when used as an offshoot does seem to be associated with a lower hateful dose of oxytocin needed and an increased rate of normal vaginal deliveries.20 [Evidence level A, RCT]
Amniotomy
It is hypothesized that amniotomy increases the product of, or causes a release of, prostaglandins locally. Risks associated with this process include umbilical cord prolapse or compression, maternal or neonatal infection, FHR deceleration, bleeding from placenta previa or low-lying placenta, and possible fetal injury. The technique for performing amniotomy is described in Table four.7,19
TABLE iv
Technique for Performing Amniotomy
| A pelvic examination is performed to evaluate the cervix and station of the presenting part. |
| The fetal heart charge per unit is recorded earlier and after the process. |
| The presenting office should be well applied to the neck. |
| The membranes over the fetal caput are removed by the examining finger. |
| A cervical claw is inserted through the cervical bone by sliding it forth the hand and fingers (hook side toward the mitt). |
| The membranes are scratched or hooked to effect rupture. |
| The nature of the amniotic fluid is recorded (clear, bloody, thick or sparse, meconium). |
Only two well-controlled trials studied the use of amniotomy solitary, and the evidence did non support its use for induction of labor.21 [Evidence level A, systematic review of RCTs]
Pharmacologic Cervical Ripening or Labor Induction
- Abstract
- Nonpharmacologic Cervical Ripening
- Pharmacologic Cervical Ripening or Labor Induction
- References
PROSTAGLANDINS
Prostaglandins human action on the cervix to enable ripening by a number of different mechanisms. They modify the extracellular ground substance of the cervix, and PGEtwo increases the action of collagenase in the cervix. They crusade an increase in elastase, glycosaminoglycan, dermatan sulfate, and hyaluronic acid levels in the cervix. A relaxation of cervical smooth muscle facilitates dilation. Finally, prostaglandins allow for an increase in intracellular calcium levels, causing contraction of myometrial musculus.22,23 Risks associated with the use of prostaglandins include uterine hyperstimulation and maternal side furnishings such every bit nausea, airsickness, diarrhea, and fever. Currently, two prostaglandin analogs are available for the purpose of cervical ripening, dinoprostone gel (Prepidil) and dinoprostone inserts (Cervidil). Prepidil contains 0.v mg of dinoprostone gel, while Cervidil contains ten mg of dinoprostone in pessary form. The techniques for gel and pessary placement are described in Tables five and half-dozen, respectively.19
Tabular array 5
Technique for Placement of Dinoprostone Gel (Prepidil)
| Patient option: | |
| Patient is afebrile. | |
| No active vaginal bleeding is present. | |
| Fetal center rate tracing is reassuring. | |
| Patient gives informed consent. | |
| Bishop score is < four. | |
| Bring gel to room temperature earlier awarding, per manufacturer's instructions. | |
| Monitor fetal heart charge per unit and uterine action continuously starting 15 to xxx minutes earlier gel introduction and standing for 30 to 120 minutes after gel insertion. | |
| Innovate the gel into the cervix as follows: | |
| If the neck is uneffaced, use the xx-mm endocervical catheter to introduce the gel into the endocervix just below the level of the internal os. | |
| If the neck is fifty percent effaced, utilise the 10-mm endocervical catheter. | |
| After awarding of the gel, the patient should remain recumbent for 30 minutes before existence allowed to ambulate. | |
| May repeat every six hours, up to three doses in 24 hours. | |
| Stop points for ripening include strong uterine contractions, a Bishop score of eight, or a alter in maternal or fetal status. | |
| Maximum recommended dosage is 1.5 mg of dinoprostone (three doses) in 24 hours. | |
| Do not start oxytocin for six to 12 hours subsequently placement of the last dose, to allow for spontaneous onset of labor and protect the uterus from overstimulation. | |
TABLE 6
Technique for Placement of Dinoprostone Vaginal Inserts (Cervidil)
| Patient option (see Table 5) |
| Using a small corporeality of h2o-miscible lubricant, place the tab into the posterior fornix of the cervix. As the device absorbs wet and swells, it releases dinoprostone at a rate of 0.3 mg per hour for 12 hours. |
| Monitor fetal heart rate and uterine activity continuously, starting 15 to 30 minutes before introduction of the insert. Because hyperstimulation may occur up to nine and one-half hours afterwards placement of the insert, fetal heart charge per unit and uterine activeness should exist monitored from placement of the insert until 15 minutes after it is removed. |
| After insertion, the patient should remain recumbent for two hours. |
| Remove the insert by pulling the string subsequently 12 hours, when agile labor begins, or if uterine hyperstimulation occurs. |
The Cochrane reviewers examined 52 well-designed studies using prostaglandins for cervical ripening or labor induction. Compared with placebo (or no treatment), use of vaginal prostaglandins increased the likelihood that a vaginal delivery would occur within 24 hours. In add-on, the cesarean department rate was comparable in all studies. The merely drawback appears to be an increased rate of uterine hyperstimulation and accompanying FHR changes.xvi,18,24
MISOPROSTOL
Misoprostol (Cytotec) is a synthetic PGE1 analog that has been plant to exist a safe and inexpensive amanuensis for cervical ripening, although it is not labeled by the U.South. Food and Drug Assistants for that purpose.
Clinical trials indicate that the optimal dose and dosing interval is 25 mcg intravaginally every four to six hours.1,25 College doses or shorter dosing intervals are associated with a college incidence of side effects, specially hyper-stimulation syndrome, divers every bit contractions lasting longer than 90 seconds or more than 5 contractions in 10 minutes. Risks too include tachysystole, defined as half-dozen or more than uterine contractions in 10 minutes for 2 consecutive x-minute periods, and hypersystole, a single wrinkle of at least two minutes' duration.
Finally, uterine rupture in women with previous cesarean section is also a possible complication, limiting its utilise to women who practice not have a uterine scar.25–28 [Reference27 —Evidence level B, cohort study] The technique for use of vaginal misoprostol is described in Table 7.29 [Evidence level A, RCT]
Tabular array 7
Technique for Intravaginal Awarding of Misoprostol (Cytotec) Tablets
| Place ane quaternary of a tablet of misoprostol intravaginally, without the utilize of whatsoever gel (gel may forbid the tablet from dissolving). |
| The patient should remain recumbent for 30 minutes. |
| Monitor fetal heart charge per unit and uterine activity continuously for at least iii hours after misoprostol application before the patient is allowed to ambulate. |
| When oxytocin (Pitocin) augmentation is required, a minimum interval of three hours is recommended after the terminal misoprostol dose. |
| Non recommended for cervical ripening in patients who have a uterine scar. |
The Cochrane reviewers concluded that use of misoprostol resulted in an overall lower incidence of cesarean section. In improver, there appears to be a higher incidence of vaginal delivery within 24 hours of application and a reduced need for oxytocin (Pitocin) augmentation.30 [Testify level A, systematic review of RCTs] Additional review of the literature indicates that misoprostol is an effective agent for cervical ripening.15,31 [Reference15—Testify level A, RCT; Reference31 —Evidence level A, systematic review of RCTs]
MIFEPRISTONE
Mifepristone (Mifeprex) is an antiprogesterone agent. Progesterone inhibits contractions of the uterus, while mifepristone counteracts this action. Currently, seven trials are underway involving 594 women using mifepristone for cervical ripening. Results have shown that women treated with mifepristone are more likely to have a favorable neck inside 48 to 96 hours when compared with placebo. In add-on, these women were more probable to deliver inside 48 to 96 hours and less likely to undergo cesarean section. All the same, trivial data is available about fetal outcomes and maternal side effects; thus, there is insufficient data to support the utilize of mifepristone for cervical ripening.32
RELAXIN
The hormone relaxin is idea to promote cervical ripening. Cochrane reviewers evaluated results of 4 studies involving 267 women and concluded that there is bereft support for the use of relaxin at this time. As with many of the other methods described in this review, farther trials are needed.33
OXYTOCIN
As pregnancy progresses, the number of oxytocin receptors in the uterus increases (by 100-fold at 32 weeks and by 300-fold at the onset of labor). Oxytocin activates the phospholipase C-inositol pathway and increases intracellular calcium levels, stimulating contractions in myometrial smoothen musculus.23 Oxytocin is the preferred pharmacologic amanuensis for inducing labor when the cervix is favorable or ripe. Numerous randomized, placebo-controlled studies have focused on the use of oxytocin in labor induction. It has been institute that low-dose (physiologic) and high-dose (pharmacologic) oxytocin regimens are as constructive in establishing acceptable labor patterns.34,35
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REFERENCES
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