Pain Management in Obstetrics

Cytochrome P4503A4 gene polymorphisms guide safe sufentanil analgesic doses in pregnant Chinese mothers: a multicenter, randomized, prospective study

BACKGROUND

Sufentanil and ropivacaine when used as epidural anesthetics effectively reduce maternal pain during labor. From previous reports, rs2242480 single nucleotide polymorphisms (SNPs) can alter sufentanil metabolism, which affects analgesic efficacy.

METHODS

We randomly divided 573 eligible mothers into groups A and B (in a 1 : 3 ratio). The control group (group A) was given sufentanil at the usual 0.5 mg/L-1 dose + 0.15% ropivacaine hydrochloride mixture in 10 ml. The sufentanil dose given to the intervention group (group B) was determined by genotype: the GA and AA genotype group (group B1) was given 87.6% (design based on previous study results) of the usual sufentanil clinical dose (0.438 mg/L-1 sufentanil + 0.15% ropivacaine hydrochloride mixture in 10 ml) and the GG genotype group (group B2) was given the same dose as group A. Efficacy indicators consisting of maternal vital signs, obstetric transfer, neonatal prognostic indicators, and adverse effects were recorded before and after analgesia across groups.

RESULTS

Visual analog scale scores after analgesia across groups were significantly different from scores before analgesia, showing that analgesic effects across groups were effective. No significant differences were observed in efficacy, obstetric transfer, and neonatal prognosis indicators between groups. In comparison to groups B1 and B2, group A showed more markedly suppressed cardiovascular and respiratory effects, and also a higher incidence of negative side effects such as vomiting and urinary retention.

CONCLUSION

We confirmed that individualizing sufentanil doses based on maternal genotypes increased safety and success rates for women during childbirth.

Labor pain management practices and associated factors in Ethiopia: A systematic review and meta-analysis

BACKGROUND

The pain that women experience during labor and childbirth is the central feature of parturition in humans. Despite improvement in the development of standards for pain assessment and treatment, labor pain is mostly ignored especially in low- and middle-income countries resulting in unmeasured suffering from childbirth for mothers.

OBJECTIVES

We aimed to provide a comprehensive estimation of the pooled magnitude and associated factors of labor pain management practices in Ethiopian public health facilities.

SEARCH STRATEGY

A systematic review and meta-analysis was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-analysis statement. Electronic databases including Google Scholar, Web of Science, Excerpta Medica Database (EMBASE), PubMed/MEDLINE, and Scopus were searched from database inception to June 30, 2023.

SELECTION CRITERIA

The inclusion criteria were established prior to article review and follows the population, intervention, comparison and outcome criterions.

DATA COLLECTION AND ANALYSIS

We evaluated publication bias by means of funnel plots and Egger's test. Heterogeneity between studies was assessed using I2 statistics. For each associated factors in meta-regressions, the pooled odds ratio (OR) and its 95% confidence interval (CI) were extracted. A P value of 0.05 was used to determine the significance of the small study effect.

MAIN RESULTS

Our search terms yielded 17 studies with 5735 participants. The pooled prevalence of labor pain management practices in Ethiopia was 45.73% (95% CI: 39.13, 52.32; I2  = 96.4). Having adequate knowledge regarding labor pain management (OR: 3.74; 95% CI: 2.74, 5.11; I2  = 53.8%), a favorable attitude toward labor pain management (OR: 2.90; 95% CI: 2.03, 4.14; I2  = 63.8%), availability of labor analgesics (OR: 3.23; 95% CI: 2.18, 4.79; I2  = 46.2%), and clinical experience of 10 or more years (OR: 3.45; 95% CI: 2.06, 5.78; I2  = 19.0%) were factors that were statistically associated with the use of labor pain management practices.

CONCLUSION

We concluded that the routine practices of labor pain management by obstetric health providers in Ethiopia are still low. Therefore, it remains important to call for holistic and inclusive interventions targeting maternity health providers and hospital officials to update their long-standing practices.

REGISTRATION

Registered in PROSPERO under protocol number CRD42023429140.

Effect of Regiosacralis Counterpressure Treatment on the Pain and Interleukin-6 Levels Among Primigravid Mothers During the First Stage Labor

BACKGROUND

Severe pain experienced by mother during the labor can cause fear and anxiety which can interfere with the overall labor process. Controlling pain during the labor process is important. Regiosacralis counterpressure pain management without altering the interleukin-6 (IL-6) level is expected to reduce the pain.

OBJECTIVE

This study was aimed to investigate the effects of regiosacralis counterpressure on the pain and IL-6 levels during the first stage of labor among primigravid mothers.

METHOD

A quasiexperiment method with pretest–posttest control group design was applied. Regiosacralis counter-pressure pain management was applied to all study participants who non-randomly recruited by consecutive sampling methods. A total of 52 primigravid mothers were selected and divided into both the intervention group (n = 26) and the control group (n = 26).

RESULT

The statistical analysis of the intervention on the pain and IL-6 level revealed a significant difference between the pretest and posttest in the intervention group (p < .001; M pretest pain = 8.96 ± .528; M posttest pain = 6.96 ± .774; M pretest IL-6 = 175.539 ± 92.281; M posttest IL-6 = 170,764 ± 70,026).

CONCLUSION

Regiosacralis counterpressure treatment is effective in controlling and reducing the pain level during the first stage labor.

Comparison of Pain Score and Complications Following Acetaminophen and Pethidine Injection During Vaginal Delivery: A Double-blind Clinical Trial

Objectives

Recently, intravenous acetaminophen has been introduced as an intervention with analgesic potential similar to that of opioid analgesics in labor pain management. This study aimed to compare the pain score and maternal and neonatal complications following acetaminophen and pethidine injections during vaginal delivery.

Methods

This randomized, double-blind clinical trial was conducted on pregnant women during the first stage of delivery referred to Ghaem and Omolbanin Hospitals in Mashhad, Iran, from March to December 2017. The subjects were assigned randomly to one of two groups: acetaminophen and pethidine. The pain intensity was measured before and 15, 60, 120, 180, and 240 minutes after injection.

Results

The pain score and pain score changes showed no significant difference between the two groups at different times. The incidence of maternal complications during delivery and the first hour after delivery was not statistically significant between the two groups, but 15 minutes after injection, vomiting (p = 0.001), nausea (p = 0.001), and dizziness (p = 0.001) were significantly higher in the pethidine group. The mean one and five minutes Apgar scores were significantly higher in the acetaminophen group.

Conclusions

Intravenous acetaminophen led to fewer maternal complications than pethidine, especially during the first 15 minutes after injection and fewer neonatal complications, especially in the Apgar score.

Reviewing pain management options for patients in active labor

Pain perception and preferences for pain management are unique to each woman in labor. This article provides an overview of the physiology of labor pain, discusses available nonpharmacologic and pharmacologic approaches to managing pain during active labor, and discusses potential benefits and risks for each option.

Labour analgesia; Molecular pathway and the role of nanocarriers: a systematic review

Labour is considered to be one of the most painful procedures in human experience. The most effective technique for pain relief during labour is neuraxial labour analgesia which provides analgesia without maternal or fetal sedation. Genetic predisposition may be of importance for pain perception and women experience varying degrees of pain in labour. Genetic variations in opioid receptor (OPR) genes may influence the response to epidural opioid analgesia during labour. The single-nucleotide polymorphism, A118G of the mu opioid receptor gene (oprm1), has been associated with altered pain perception. Targeted drug delivery reduces toxic side effects. Liposomes, nano-particles, nanofibres hydrogel, have been suggested to deliver anaesthetic drugs.