Childbirth Preparation and Nonpharmacologic Analgesia EPUB version of this bookEPUB version of this book

At their core, the experiences of labor and birthing a child are intensely personal, intimate processes for many women, regardless of culture or background. While anesthesia providers may have a particular view of what is important to someone during childbirth, including pain management strategies, our goals should be to understand each woman’s values and beliefs and to recommend therapies when appropriate, considering medical and obstetric considerations and personal wishes. Some parturients seek nonpharmacologic strategies to cope with the pain of labor; these strategies may be independent of, or complementary to, more traditional forms of labor pain relief such as neuraxial analgesia. Studies of nonpharmacologic approaches to pain management during labor compared with the usual care, such as neuraxial or intravenous pain relief, have found that some nonpharmacologic strategies, such as water immersion, acupuncture, and upright maternal positioning, are associated with reductions in various obstetric interventions (e.g., use of oxytocin). While some evidence regarding nonpharmacologic approaches may appear less rigorous than that supporting pharmacologic-based forms of pain relief, many of these nonpharmacologic approaches are rooted in pain-based theories, including (1) the gate control theory (e.g., light massage, water immersion, ambulation, birthing balls); (2) diffuse noxious inhibitory control (e.g., sterile water injections, acupuncture, acupressure, transcutaneous electrical nerve stimulation [TENS]); and (3) central nervous system control (e.g., antenatal education, continuous support during labor, meditation, hypnosis, aromatherapy). This chapter seeks to provide obstetric anesthesia providers with a comprehensive knowledge of nonpharmacologic labor strategies and how they may influence the labor pain experience and obstetric interventions. This lays the groundwork for informed discussion of pain relief options among patients, nurses, obstetricians, and anesthesia providers.

PAIN PERCEPTION

Anesthesia providers are indebted to Ronald Melzack and colleagues for their early studies of the pain of childbirth. In 1975 Melzack described the use of the McGill Pain Questionnaire to investigate differences among pain modalities. In a subsequent study, he and colleagues found that labor pain is one of the most intense types of pain among those studied, although the results were associated with factors such as a history of menstrual difficulties and lower socioeconomic status (higher scores). In general, parous women had lower pain scores than nulliparous women, but the responses varied widely within the groups ( Figs. 22.1 and 22.2 ). Early studies identified a modest decrease in the average pain score among nulliparous women who participated in childbirth preparation, but the training did not eliminate pain in these women. More recent studies have focused on pregnant women’s experiences of childbirth and have shown potential benefits from attending childbirth preparation training, including lowered anxiety assessments, shorter duration of the first stage of labor, lower epidural analgesia usage rates, lower rates of cesarean delivery, and enhanced labor satisfaction. While this body of evidence is encouraging, higher-quality studies are needed.

Fig. 22.1

The severity of pain during labor as assessed by the McGill Pain Questionnaire for 87 nulliparous women.

Modified from Melzack R, Taezner P, Feldman P, Kinch RA. Labour is still painful after prepared childbirth training. Can Med Assoc J . 1981;125:357–363.

Fig. 22.2

The severity of pain during labor as assessed by the McGill Pain Questionnaire for 54 parous women.

Modified from Melzack R, Taezner P, Feldman P, Kinch RA. Labour is still painful after prepared childbirth training. Can Med Assoc J . 1981;125:357–363.

HISTORY OF CHILDBIRTH PREPARATION AND INTERVENTION

As one traces the history of the evolution of childbirth analgesia, there is tension in the balance between the degree of medicalization, maternal participation, and pain management. Before the mid-19th century, childbirth occurred at home in the company of family and friends, without medication or medical intervention. The specialty of obstetrics was developed to decrease maternal mortality. Interventions initially developed for the management of complications became accepted and practiced as routine obstetric care. Physicians first administered anesthesia for childbirth during this period (see Chapter 1 ); the 1848 meeting of the American Medical Association included reports of the use of ether and chloroform in approximately 2000 obstetric cases. The combination of morphine and scopolamine (i.e., twilight sleep) gained popularity in the early 1910s, followed by great alarm with increasing reports of newborn apneic events. Nonetheless, these techniques were widely used, and influential women advocated that they be made available to all parturients. Together, these developments moved childbirth from the home and family unit to the hospital environment. As this move occurred, women maintained their desire to be active participants during childbirth.

In his original publication entitled Childbirth Without Fear , Dick-Read asserted his belief that childbirth was not inherently painful. He opined that the pain of childbirth results from a “fear-tension-pain syndrome.” He believed—and taught—that antepartum instruction about muscle relaxation and elimination of fear would prevent labor pain. Some readers incorrectly concluded that he advocated a return to primitive obstetrics, but this was not the case. Review of his practice reveals that he used the available obstetric techniques—including analgesia, anesthesia, episiotomy, forceps, and abdominal delivery—as appropriate for the individual patient. However, he cautioned against the routine use of these procedures and encouraged active participation of mothers in the delivery of their infants. Unfortunately, he did not use the scientific method to validate his beliefs.

Although Dick-Read was the earliest proponent of so-called “natural” childbirth, it was Fernand Lamaze who introduced the Western world to “psychoprophylaxis.” His publications were based on techniques that he observed while traveling in Russia, often derived from the teachings of Velvovsky. Again, no data were presented to link these treatments to outcomes. The “Lamaze method” became popular in the United States after Marjorie Karmel wrote about her childbirth experience under the care of Dr. Lamaze. Within 1 year of the publication of her book, Thank You, Dr. Lamaze: A Mother’s Experiences in Painless Childbirth , the American Society for Psychoprophylaxis in Obstetrics was born and organizations such as the International Childbirth Education Association and the La Leche League were formed. These organizations actively encouraged a renewed emphasis on family-centered maternity care, and society was receptive. Women and their partners were ready to actively participate in childbirth and to have input in decisions about obstetric and anesthetic interventions. Childbirth preparation methods were taught and used extensively, despite a lack of scientific validation of their efficacy.

In 1975 Leboyer described a modification of natural childbirth in his book Birth Without Violence. He advocated childbirth in a dark, quiet room; gentle massage of the newborn without routine suctioning; and a warm bath soon after birth. He opined that these maneuvers result in a less shocking first-separation experience and a healthier, happier infancy and childhood. Although there are few controlled studies of this method, published observations do not support his claim of superiority.

Childbirth Education and Preparation

The major goals of childbirth education that were initially promoted by Dick-Read are taught with little modification in formal childbirth preparation classes today ( Box 22.1 ). Most current classes credit Lamaze with the major components of childbirth preparation, even though Dick-Read was the first to promote patient education, relaxation training, breathing exercises, and paternal participation. Some instructors and training manuals claim other benefits of childbirth preparation ( Box 22.2 ), although a 2015 review of the Bradley method and HypnoBirthing methods called for more rigorous study with transparent methods rather than self-reported outcomes. A 2007 systematic review concluded that there is insufficient evidence to evaluate the efficacy of antenatal childbirth education on childbirth and parenting outcomes, although a 2023 scoping review emphasized the need for more rigorous study. Despite the lack of high-quality evidence and variability in teaching quality, childbirth preparation classes are broadly available and often attended.

Box 22.1

Goals of Childbirth Preparation

  • •

    Patient education about pregnancy, labor, and delivery

  • •

    Relaxation training

  • •

    Instruction in breathing techniques

  • •

    Participation of father/support person

  • •

    Early parental bonding

Box 22.2

Purported Benefits of Childbirth Preparation

  • •

    Greater maternal control and cooperation

  • •

    Decreased maternal anxiety

  • •

    Reduced maternal pain

  • •

    Decreased maternal need for analgesia/anesthesia

  • •

    Shorter labor

  • •

    Diminished maternal morbidity

  • •

    Less fetal stress/distress

  • •

    Strengthened family relationships because of the shared birth experience

Socioeconomic disparities exist in childbirth education class attendance. In addition, the effect of childbirth education on attitude and childbirth experience depends, in part, on the social class to which the mother belongs. Although investigators have found that childbirth classes have a positive effect on the attitudes of both parents of all social classes, this effect is more pronounced among “working-class” and indigent women ; this latter finding probably reflects the greater availability and use of other educational materials by middle- and upper-class women. Childbirth classes often are the only—or at least the primary—source of information for working-class and indigent women. Attendance is also associated with improved postpartum practices (e.g., safe newborn sleeping practices, breastfeeding). Contemporary analyses suggest that privately insured women who attend childbirth education classes may benefit from a lower elective cesarean delivery rate.

In the modern era, women and their partners obtain information about childbirth and analgesia from many sources. Social media and other internet sites have become the primary source of information for many patients. However, variability in internet-based information quality may limit pregnant women’s understanding of her options. Knowledge of information sources and biases held by patients facilitates shared decision-making between anesthesia providers and their patients.

Limitations of Childbirth Preparation

Limitations of the widespread application of psychoprophylaxis and other childbirth preparation methods remain. Proponents assume that these techniques are easily used during labor and delivery; however, Copstick et al. found that patients were able to use the coping techniques in the early first stage of labor but that the successful use of the coping skills became less and less common as labor progressed. By the onset of the second stage, less than one-third of mothers were able to use any of the breathing or postural techniques taught during their childbirth classes. The method of preparation influences the pregnant woman’s ability to use breathing and relaxation techniques. Bernardini et al. observed that self-taught pregnant women are less likely to practice the techniques during the prenatal period or to use the techniques during labor.

Childbirth preparation classes may also set false expectations. If a woman does not relate to the “normal” delivery discussed during classes, she may experience a sense of failure or inferiority. Both Stewart and Guzman Sanchez et al. have discussed adverse psychological reactions in women who were unable to use psychoprophylaxis successfully during labor and delivery. In addition, several women have written about their disappointment with the dogmatic approach of their childbirth instructors; these women described instructors who rigidly defined the “correct” way to have a “proper” birth experience. In contrast, some evidence exists that antenatal childbirth education courses may help ease the fear of childbirth.

Effects on Labor Pain and Use of Analgesics

Little scientific evidence supports the efficacy of childbirth preparation in mitigating labor pain. Psychology, nursing, obstetric, anesthesia, and lay journals provide extensive discussions of childbirth preparation, but most articles describe anecdotal clinical experiences with an assumption that it offers benefits for the mother and child. Outcome studies often do not include a group of women who were randomly assigned to an untreated or a placebo-controlled group, and statistical analysis is often incomplete. Older studies have reported a decreased use of analgesic medications 43,44 or regional anesthesia, shorter first stage of labor, and a lower incidence of nonreassuring fetal status and cesarean delivery, whereas others reported no change in the use of analgesics, duration of labor, rate of operative vaginal or cesarean delivery, or incidence of nonreassuring fetal status. A 2013 systematic review found a paradoxical increase in labor epidural analgesia use and induction of labor among those who attended childbirth classes, although benefits included fewer admissions for false labor, decreased anxiety about childbirth, and enhanced partner engagement. A 2020 retrospective review of 197 low-risk, nulliparous women who self-selected to attend or not attend childbirth classes noted that the attendees were less likely to undergo induction of labor and had lower use of analgesic medications during labor. There was no significant difference between groups in maternal satisfaction or perception of control. These diverse findings may reflect different patient populations, poor study design, or researcher bias. Table 22.1 summarizes several studies of childbirth preparation training and their association with labor outcome.

Table 22.1

Effects of Childbirth Preparation Training

Study Analgesic Use Neuraxial Anesthesia Duration of Labor Cesarean Delivery Rate Operative Delivery Rate Fetal Distress Oxytocin Use
Patton et al. NC NC NC NC NC NC ↑︎
Hetherington ↓︎ ↓︎ — — ↓︎ — —
Zax et al. ↓︎ ↓︎ NC — — — —
Scott and Rose ↓︎ ↓︎ NC NC ↓︎ NC NC
Hughey et al. NC ↓︎ NC ↓︎ ↓︎ ↓︎ NC
Sturrock and Johnson NC — NC NC NC — —
Brewin and Bradley NC NC NC NC NC — —
Delke et al. NC — ↓︎ — — NC NC
Yohai et al. NC NC ↓︎ NC — — —
Vanderlaan et al. — — — ↓︎ — — —

NC , No change; ↑︎, increased; ↓︎, decreased;—, not studied/reported.

To elucidate the effect of the coping techniques taught in childbirth classes, several investigators have attempted to quantify changes in pain threshold, pain perception, anxiety levels, and physiologic responses to standardized stimuli by evaluating nonpregnant and nulliparous women in laboratory settings. Studies varied in the stimulus applied, the coping techniques studied, and the parameters analyzed. Together, these studies suggest that practicing these techniques facilitates their efficacy and that newer cognitive techniques (e.g., systematic desensitization, sensory transformation) may be more effective than traditional Lamaze techniques of varied breathing patterns and relaxation. Further studies may help refine childbirth preparation to maximize the positive psychophysiologic effects.

NONPHARMACOLOGIC ANALGESIC TECHNIQUES

Nonpharmacologic analgesic techniques range from those that require minimal specialized equipment and training and are widely available to those that are offered only by institutions with the necessary equipment and trained personnel ( Box 22.3 ). Most published studies assessing nonpharmacologic methods of labor analgesia are of poor quality. Several comprehensive reviews of alternative therapies for pain management provide a foundation for discussion with patients and obstetric providers ; however, clinical evidence is insufficient on techniques such as music therapy, aromatherapy, and chiropractic manipulation. These techniques may provide intangible benefits that pregnant women may consider to be an important part of their labor experience.

Box 22.3

Nonpharmacologic Analgesic Techniques

Minimal Training/Equipment

  • •

    Emotional support

  • •

    Touch and massage

  • •

    Therapeutic use of heat and cold

  • •

    Hydrotherapy

  • •

    Vertical position

Specialized Training/Equipment

  • •

    Biofeedback

  • •

    Sterile water injection

  • •

    Transcutaneous electrical nerve stimulation

  • •

    Acupuncture

  • •

    Hypnosis

  • •

    Virtual reality

Continuous Labor Support

Continuous support during labor is essential to the process of a satisfying childbirth experience. Typically, the pregnant woman’s partner, family member, and/or friend provide this support. Research has noted that partner participation is associated with decreased maternal anxiety and medication requirements. Studies evaluating the benefits of emotional support provided by doulas or other unrelated individuals on the mode of delivery, feelings about the birth experience, use of labor analgesia, oxytocin augmentation, duration of labor, perineal trauma, breastfeeding outcomes, and Apgar scores, among other outcomes, suggest that the companionship of another woman who is not part of the medical establishment may reduce a parturient’s anxiety more effectively than the companionship provided by her partner. A patient’s sense of isolation adversely affects her perception of labor. In one study, women randomly assigned to receive intrapartum support from a friend or female relative who was chosen by the parturient and trained as a doula were more likely to have positive feelings about their delivery and had a higher rate of breastfeeding 6 to 8 weeks after delivery than women who were randomly assigned to receive usual care.

A 2017 metaanalysis evaluated results from 26 studies that included 15,858 women who were randomly assigned to receive either continuous childbirth support or usual care ( Table 22.2 ). The pooled data suggest that women who receive one-on-one support during labor are less likely to use any type of analgesia and report negative feelings about the childbirth experience, and are more likely to have a spontaneous vaginal delivery, although evidence was generally of low quality. The benefits were greater when the support person was present in a doula (trained labor companion) role. In addition, the mean duration of labor was slightly shorter (approximately 41 minutes) in the women who received continuous support during labor, and the likelihood of a low 5-minute Apgar score was less.

Table 22.2

Systematic Review: Continuous Labor Support Versus Usual Care

Data from Bohren MA, Hofmeyr GJ, Sakala C, et al. Continuous support for women during childbirth. Cochrane Database Syst Rev . 2017;(7):CD003766.

Outcome Number of Trials Number of Subjects Relative Risk 95% Confidence Interval
Use of neuraxial analgesia 9 11,444 0.93 0.88 to 0.99
Use of any analgesia 15 12,433 0.90 0.84 to 0.96
Spontaneous vaginal delivery 21 14,369 1.08 1.04 to 1.12
Operative vaginal delivery 19 14,118 0.90 0.85 to 0.96
Cesarean delivery 24 15,347 0.75 0.64 to 0.88
Negative feelings about childbirth experience 11 11,133 0.69 0.59 to 0.79
Labor duration 13 5429 −0.69 h −1.04 to −0.34
Infant with a low 5-min Apgar score 14 12,615 0.62 0.46 to 0.85

These results have important implications for obstetric care, although they may not be generalizable. Results from trials in North America do not appear as striking as those from Europe or Africa. The aforementioned systematic review of continuous labor support concluded that the preponderance of evidence suggests that all parturients should have access to emotional support, whether it is provided by the partner, a family member, a labor companion (e.g., doula), or professional hospital staff. Further studies should compare different models of continuous childbirth support and should include longer-term outcomes, including breastfeeding and postpartum depression.

Touch and Massage

Various touch and massage techniques are discussed with women and their support persons during childbirth preparation classes. These techniques include effleurage (e.g., long, light stroking of the back or abdomen), counterpressure to alleviate back discomfort, and reassuring pats. While a 2018 systematic review found low-quality evidence that massage provided reduced self-reported pain intensity, other outcomes showed no difference based on very low-quality evidence. Touch and massage can provide a comfort that is generally appreciated by women during labor. These measures may be used by the pregnant woman, her support person, or the professional staff members providing intrapartum care. The techniques are easily discontinued. In some cases, touch and massage may reduce discomfort. More often, touch and massage transmit a sense of caring, which fosters a sense of security and well-being.

Therapeutic Use of Heat and Cold

Another simple technique for alleviating labor pain is the therapeutic use of temperature (hot or cold) applied to various regions of the body. Warm compresses may be placed on localized areas or a warm blanket may cover the entire body. Alternatively, ice packs may be placed on the low back or perineum to decrease pain perception. Studies of the therapeutic use of heat and cold during labor are of low quality. The use of superficial heat and cold for comfort is widespread (if not completely understood), and it has no discernible risk to the mother or the fetus. Cold and heat should not be applied to anesthetized skin as diminished awareness may increase the potential for damage to the skin.

Aromatherapy

Aromatherapy is the use of essential oils, which are fragrant, volatile organic compounds obtained by distillation of plant material. The oils are commonly combined with a carrier oil and massaged into the skin, inhaled, or mixed in a bath. Two metaanalyses showed pain-reducing benefits for labor with the use of aromatherapy. Another metaanalysis investigating types of aromatherapy showed reduced pain in the first stage of labor with lavender oil, jasmine oil, rose oil, chamomile oil, bosweilla oil, and bitter orange oil. Given the widespread availability and relative affordability of aromatherapy diffusers and oils, they should be included in the childbirth experience if desired by the patient, barring any hypersensitivity to these compounds.

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Oct 18, 2026 | Posted by in ANESTHESIA | Comments Off on Childbirth Preparation and Nonpharmacologic Analgesia EPUB version of this bookEPUB version of this book

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