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Summary: Disparities relating to postpartum recovery outcomes in different socio‐economic and racial ethnic groups are underexplored. We conducted a planned analysis of a large prospective caesarean delivery cohort to explore the relationship between ethnicity, socio‐economic status and postpartum recovery. Eligible patients were enrolled and baseline demographic, obstetric and medical history data were collected 18 h and 30 h following delivery. Patients completed postpartum quality of life and recovery measures in person on day 1 (EuroQoL EQ‐5D‐5L, including global health visual analogue scale; Obstetric Quality of Recovery‐10 item score; and pain scores) and by telephone between day 28 and day 32 postpartum (EQ‐5D‐5L and pain scores). Socio‐economic group was determined according to the Index of Multiple Deprivation quintile of each patient's usual place of residence. Data from 1000 patients who underwent caesarean delivery were included. There were more patients of Asian, Black and mixed ethnicity in the more deprived quintiles. Patients of White ethnicities had shorter postpartum duration of hospital stay compared with patients of Asian and Black ethnicities (35 (28–56 [18–513]) h vs. 44 (31–71 [19–465]) h vs. 49 (33–75 [23–189]) h, respectively. In adjusted models at day 30, patients of Asian ethnicity had a significantly greater risk of moderate to severe pain (numerical rating scale ≥ 4) at rest and on movement (odds ratio (95%CI) 2.42 (1.24–4.74) and 2.32 (1.40–3.87)), respectively). There were no differences in readmission rates or incidence of complications between groups. Patients from White ethnic backgrounds experience shorter postpartum duration of stay compared with patients from Asian and Black ethnic groups. Ethnic background impacts pain scores and recovery at day 1 postpartum and following hospital discharge, even after adjusting for socio‐economic group. Further work is required to understand the underlying factors driving differences in pain and recovery and to develop strategies to reduce disparities in obstetric patients. [ABSTRACT FROM AUTHOR]

A retrospective cohort study was conducted to determine the duration of motor block regression following neuraxial anesthesia for caesarean delivery. The study found that using a time threshold of 4 hours for straight leg raise against gravity, a large number of patients required review, leading to a labor-intensive process. The study also hypothesized that the median time to motor block regression after spinal or epidural anesthesia is greater than 4 hours. The results showed that more than 50% of patients still had significant motor block at 4 hours following spinal anesthesia, prompting the extension of the time trigger to 6 hours. The study suggests the need for further research on obstetric neuraxial regression times and the impact of different time triggers for neurological monitoring protocols. [Extracted from the article]

Summary: We aimed to test whether bilateral injection of bupivacaine 0.25% in the transversalis fascia plane reduced 24 h opioid dose after singleton caesarean section, under spinal anaesthesia with intrathecal morphine, compared with saline 0.9% injectate. We allocated randomly 52 women to bilateral injection of 20 ml saline 0.9% on arrival in the post‐anaesthesia care unit and 54 women to bilateral injection of 20 ml bupivacaine 0.25% (with adrenaline 2.5 μg.ml‐1). Mean (SD) cumulative morphine equivalent opioid dose 24 h after saline injection was 32.3 (28.3) mg and 18.7 (20.2) mg after bupivacaine injection, a mean (95%CI) difference of 13.7 (4.1–23.2) mg (p = 0.006). Median (IQR [range]) time to first postoperative opioid dose was 3.0 (1.5–10.3 [0.0–57.4]) h after saline 0.9% and 8.2 (2.7–29.6 [0.2–55.4]) h after bupivacaine 0.25% (p = 0.054). Transversalis fascia plane with bupivacaine 0.25% with adrenaline reduced postoperative pain at rest during 48 h (0–10‐point scale) by a mean (95%CI) of 0.9 (0.2–1.6) points (p = 0.013) and on movement by 1.2 (0.4–2.1) points (p = 0.004). We conclude that transversalis fascia plane bupivacaine 0.25% with adrenaline reduces pain and opioid dose after caesarean section compared with saline 0.9%. [ABSTRACT FROM AUTHOR]

Summary: Oxytocin is widely used to prevent atonic postpartum haemorrhage after caesarean delivery. Initial treatment failure rates are high and inadequate dosing may contribute. Excessive doses, however, are associated with serious adverse effects. The pharmacokinetic data from this context are sparse and there is a lack of data in the immediate postpartum minutes after an initiating bolus. The pharmacodynamic data from this context are exclusively from dose‐effect studies, with some suggesting that higher doses of oxytocin are required to provide adequate uterine tone in obese compared with non‐obese women. We aimed to perform a pharmacokinetic and pharmacodynamic study that would facilitate more precise weight‐based oxytocin dosing. We measured arterial oxytocin concentration, uterine tone and haemodynamic parameters in 25 women in the first 40 min after exogenous oxytocin administration at elective caesarean delivery. Serum oxytocin concentrations varied considerably between individuals. We constructed a one‐compartment pharmacokinetic model of exogenous oxytocin deposition, after its administration with an initiating bolus and a maintenance infusion, at elective caesarean delivery. Body weight was evaluated as a potential covariate but was not included in the model due to lack of statistically significant reduction in the objective function. We calculated the volume of distribution and clearance (mean [coefficient of variation]) as 156.1 l [18%] and 83 ml.s−1 [32%] but found no within‐individual correlation between serum oxytocin concentration and uterine tone or haemodynamic parameters. In conclusion, we observed a large variation in serum oxytocin concentrations between individuals receiving similar doses of oxytocin and were unable to establish weight‐based dosing of exogenous oxytocin at caesarean delivery. Our findings suggest that future studies on oxytocin pharmacokinetics would need large sample sizes. In the absence of such data, oxytocin dosing should continue to be guided by uterine tone assessments and adjusted according to a strategy based on the best evidence from dose‐effect studies. [ABSTRACT FROM AUTHOR]

Summary: Anaesthesia has been shown to contribute disproportionately to maternal mortality in low‐resource settings. This figure exceeds 500 per 100,000 live births in Tanzania, where anaesthesia is mainly provided by non‐physician anaesthetists, many of whom are working as independent practitioners in rural areas without any support or opportunity for continuous medical education. The three‐day Safer Anaesthesia from Education (SAFE) course was developed to address this gap by providing in‐service training in obstetric anaesthesia to improve patient safety. Two obstetric SAFE courses with refresher training were delivered to 75 non‐physician anaesthetists in the Mbeya region of Tanzania between August 2019 and July 2020. To evaluate translation of knowledge into practice, we conducted direct observation of the SAFE obstetric participants at their workplace in five facilities using a binary checklist of expected behaviours, to assess the peri‐operative management of patients undergoing caesarean deliveries. The observations were conducted over a 2‐week period at pre, immediately post, 6‐month and 12‐month post‐SAFE obstetric training. A total of 320 cases completed by 35 participants were observed. Significant improvements in behaviours, sustained at 12 months after training included: pre‐operative assessment of patients (32% (pre‐training) to 88% (12 months after training), p < 0.001); checking for functioning suction (73% to 85%, p = 0.003); using aseptic spinal technique (67% to 100%, p < 0.001); timely administration of prophylactic antibiotics (66% to 95%, p < 0.001); and checking spinal block adequacy (32% to 71%, p < 0.001). Our study has demonstrated positive sustained changes in the clinical practice amongst non‐physician anaesthetists as a result of SAFE obstetric training. The findings can be used to guide development of a checklist specific for anaesthesia for caesarean section to improve the quality of care for patients in low‐resource settings. [ABSTRACT FROM AUTHOR]

Summary: To better understand outcomes in postpartum patients who receive peripartum anaesthetic interventions, we aimed to assess quality of recovery metrics following childbirth in a UK‐based multicentre cohort study. This study was performed during a 2‐week period in October 2021 to assess in‐ and outpatient post‐delivery recovery at 1 and 30 days postpartum. The following outcomes were reported: obstetric quality of recovery 10‐item measure (ObsQoR‐10); EuroQoL (EQ‐5D‐5L) survey; global health visual analogue scale; postpartum pain scores at rest and movement; length of hospital stay; readmission rates; and self‐reported complications. In total, 1638 patients were recruited and responses analysed from 1631 (99.6%) and 1282 patients (80%) at one and 30 days postpartum, respectively. Median (IQR [range]) length of stay postpartum was 39.3 (28.5–61.0 [17.7–513.4]), 40.3 (28.5–59.1 [17.8–220.9]), and 35.9 (27.1–54.1 [17.9–188.4]) h following caesarean, instrumental and vaginal deliveries, respectively. Median (IQR [range]) ObsQoR‐10 score was 75 ([62–86] 4–100) on day 1, with the lowest ObsQoR‐10 scores (worst recovery) reported by patients undergoing caesarean delivery. Of the 1282 patients, complications within the first 30 days postpartum were reported by 252 (19.7%) of all patients. Readmission to hospital within 30 days of discharge occurred in 69 patients (5.4%), with 49 (3%) for maternal reasons. These data can be used to inform patients regarding expected recovery trajectories; facilitate optimal discharge planning; and identify populations that may benefit most from targeted interventions to improve postpartum recovery experience. [ABSTRACT FROM AUTHOR]

This document is a reply to a study on neurological sequelae after neuraxial anesthesia in obstetric patients. The authors thank the researchers for their interest and address concerns about the potential unintended consequences of delaying anesthesia review. They clarify their stance on the issue, stating that any abnormally prolonged motor recovery should prompt immediate review by an anesthetist. They discuss the use of higher doses of intrathecal hyperbaric bupivacaine and the need for further research on the effects of changing timing triggers for the early detection of complications. [Extracted from the article]

The article discusses the challenges of detecting serious complications after central neuraxial blockade in obstetric anesthesia. It highlights the importance of assessing motor blockade after neuraxial anesthesia and recommends a 4-hour assessment using the straight leg raise test. The article also emphasizes the need for local protocols to effectively detect rare complications without overwhelming departments with unnecessary reviews. The Rotunda Hospital in Dublin has implemented a patient-centered initiative using regional anesthesia alert bracelets to promote inclusion in recovery and prompt anesthetic review if necessary. The article concludes by emphasizing the importance of developing protocols to detect and manage neurological complications after neuraxial blockade. [Extracted from the article]

Summary: There is evidence that ethnic inequalities exist in maternity care in the UK, but those specifically in relation to UK obstetric anaesthetic care have not been investigated before. Using routine national maternity data for England (Hospital Episode Statistics Admitted Patient Care) collected between March 2011 and February 2021, we investigated ethnic differences in obstetric anaesthetic care. Anaesthetic care was identified using OPCS classification of interventions and procedures codes. Ethnic groups were coded according to the hospital episode statistics classifications. Multivariable negative binominal regression was used to model the relationship between ethnicity and obstetric anaesthesia (general and neuraxial anaesthesia) by calculating adjusted incidence ratios for the following: differences in maternal age; geographical residence; deprivation; admission year; number of previous deliveries; and comorbidities. Women giving birth vaginally and by caesarean section were considered separately. For women undergoing elective caesarean births, after adjustment for available confounders, general anaesthesia was 58% more common in Caribbean (black or black British) women (adjusted incidence ratio [95%CI] 1.58 [1.26–1.97]) and 35% more common in African (black or black British) women (1.35 [1.19–1.52]). For women who had emergency caesarean births, general anaesthesia was 10% more common in Caribbean (black or black British) women (1.10 [1.00–1.21]) than British (white) women. For women giving birth vaginally (excluding assisted vaginal births), Bangladeshi (Asian or Asian British), Pakistani (Asian or Asian British) and Caribbean (black or black British) women were, respectively, 24% (0.76 [0.74–0.78]), 15% (0.85 [0.84–0.87]) and 8% (0.92 [0.89–0.94]) less likely than British (white) women to receive neuraxial anaesthesia. This observational study cannot determine the causes for these disparities, which may include unaccounted confounders. Our findings merit further research to investigate potentially remediable factors such as inequality of access to appropriate obstetric anaesthetic care. [ABSTRACT FROM AUTHOR]

A recent study examined the analgesic efficacy of adding a transversalis fascia plane block to a multimodal analgesia regime in women undergoing caesarean section under spinal anesthesia with intrathecal opioids. The study found that patients who received the transversalis fascia plane block had significantly lower 24-hour cumulative morphine consumption compared to control patients. However, the study did not specify whether the reported morphine consumption was oral or intravenous. The addition of the transversalis fascia plane block did not result in a significant difference in postoperative recovery or patient satisfaction scores. Therefore, the clinical value of this intervention is questionable. [Extracted from the article]

The article discusses the impact of out-of-hours elective surgery on patient outcomes, particularly in obstetrics and gynaecology hospitals. It highlights concerns about increased mortality risk associated with evening and night-time surgeries, potentially due to surgeon fatigue, reduced staffing levels, and adverse airway incidents. The authors suggest further research is needed to better understand the influence of timing on postoperative outcomes and address modifiable risk factors. The study emphasizes the importance of patient safety in healthcare systems facing capacity challenges and inadequate staffing levels. [Extracted from the article]

This document is a correction to an article titled "Carbetocin vs. oxytocin at elective caesarean delivery: a double-blind, randomized, controlled, non-inferiority trial of low- and high-dose regimens." The authors clarify that some comparisons in the article were misinterpreted as non-inferior when they were actually inconclusive due to an incorrect definition of non-inferiority in the statistical methods. They provide the correct definition and state that further studies are needed to confirm the non-inferiority of low dose oxytocin compared to high dose oxytocin. The authors also correct the formula used to calculate estimated blood loss, clarifying that it was based on estimated blood volume rather than the woman's estimated weight. [Extracted from the article]

Summary: A woman who experiences pain during caesarean section under neuraxial anaesthesia is at risk of adverse psychological sequelae. Litigation arising from pain during caesarean section under neuraxial anaesthesia has replaced accidental awareness under general anaesthesia as the most common successful medicolegal claim against obstetric anaesthetists. Generic guidelines on caesarean section exist, but they do not provide specific recommendations for this area of anaesthetic practice. This guidance aims to offer pragmatic advice to support anaesthetists in caring for women during caesarean section. It emphasises the importance of non‐technical skills, offers advice on best practice and aims to encourage standardisation. The guidance results from a collaborative effort by anaesthetists, psychologists and patients and has been developed to support clinicians and promote standardisation of practice in this area. [ABSTRACT FROM AUTHOR]

Summary: Neuraxial anaesthesia is widely utilised for elective caesarean section, but the prevalence of inadequate intra‐operative anaesthesia is unclear. We aimed to determine the prevalence of inadequate neuraxial anaesthesia for elective caesarean section; prevalence of conversion from neuraxial anaesthesia to general anaesthesia following inadequate neuraxial anaesthesia; and the effect of mode of anaesthesia. We searched studies reporting inadequate neuraxial anaesthesia that used ≥ ED95 doses (effective dose in 95% of the population) of neuraxial local anaesthetic agents. Our primary outcome was the prevalence of inadequate neuraxial anaesthesia, defined as the need to convert to general anaesthesia; the need to repeat or abandon a planned primary neuraxial technique following incision; unplanned administration of intra‐operative analgesia (excluding sedatives); or unplanned epidural drug supplementation. Fifty‐four randomised controlled trials were included (3497 patients). The overall prevalence of requirement for supplemental analgesia or anaesthesia was 14.6% (95%CI 13.3–15.9%); 510 out of 3497 patients. The prevalence of general anaesthesia conversion was 2 out of 3497 patients (0.06% (95%CI 0.0–0.2%)). Spinal/combined spinal–epidural anaesthesia was associated with a lower overall prevalence of inadequate neuraxial anaesthesia than epidural anaesthesia (10.2% (95%CI 9.0–11.4%), 278 out of 2732 patients vs. 30.3% (95%CI 26.5–34.5%), 232 out of 765 patients). Further studies are needed to identify risk factors, optimise detection and management strategies and to determine long‐term effects of inadequate neuraxial anaesthesia. [ABSTRACT FROM AUTHOR]

Summary: Since the start of the COVID‐19 pandemic, few studies have reported anaesthetic outcomes in parturients with SARS‐CoV‐2 infection. We reviewed the labour analgesic and anaesthetic interventions utilised in symptomatic and asymptomatic parturients who had a confirmed positive test for SARS‐CoV‐2 across 10 hospitals in the north‐west of England between 1 April 2020 and 31 May 2021. Primary outcomes analysed included the analgesic/anaesthetic technique utilised for labour and caesarean birth. Secondary outcomes included a comparison of maternal characteristics, caesarean birth rate, maternal critical care admission rate along with adverse composite neonatal outcomes. A positive SARS‐CoV‐2 test was recorded in 836 parturients with 263 (31.4%) reported to have symptoms of COVID‐19. Neuraxial labour analgesia was utilised in 104 (20.4%) of the 509 parturients who went on to have a vaginal birth. No differences in epidural analgesia rates were observed between symptomatic and asymptomatic parturients (OR 1.03, 95%CI 0.64–1.67; p = 0.90). The neuraxial anaesthesia rate in 310 parturients who underwent caesarean delivery was 94.2% (95%CI 90.6–96.0%). The rates of general anaesthesia were similar in symptomatic and asymptomatic parturients (6% vs. 5.7%; p = 0.52). Symptomatic parturients were more likely to be multiparous (OR 1.64, 95%CI 1.19–2.22; p = 0.002); of Asian ethnicity (OR 1.54, 1.04–2.28; p = 0.03); to deliver prematurely (OR 2.16, 95%CI 1.47–3.19; p = 0.001); have a higher caesarean birth rate (44.5% vs. 33.7%; OR 1.57, 95%CI 1.16–2.12; p = 0.008); and a higher critical care utilisation rate both pre‐ (8% vs. 0%, p = 0.001) and post‐delivery (11% vs. 3.5%; OR 3.43, 95%CI 1.83–6.52; p = 0.001). Eight neonates tested positive for SARS‐CoV‐2 while no differences in adverse composite neonatal outcomes were observed between those born to symptomatic and asymptomatic mothers (25.8% vs. 23.8%; OR 1.11, 95%CI 0.78–1.57; p = 0.55). In women with COVID‐19, non‐neuraxial analgesic regimens were commonly utilised for labour while neuraxial anaesthesia was employed for the majority of caesarean births. Symptomatic women with COVID‐19 are at increased risk of significant maternal morbidity including preterm birth, caesarean birth and peripartum critical care admission. [ABSTRACT FROM AUTHOR]

Summary: Caesarean delivery is common and can cause severe postoperative pain but injection of local anaesthetic at various sites for regional blocks or local anaesthetic infiltration may reduce this. We aimed to compare and rank these sites. We searched PubMed, Google Scholar, EMBASE and CENTRAL to June 2021 for randomised controlled trials and performed a random‐effects Bayesian model network meta‐analysis. The primary outcome was dose of parenteral morphine equivalents in the first 24 postoperative hours. We used surface under cumulative ranking probabilities to order techniques. We analysed 114 trials (8730 participants). The ordered mean (95% credible interval) reduction in morphine equivalents, from 34 mg with placebo, were as follows: ilio‐inguinal 15 (1–32) mg; ilio‐inguinal–iliohypogastric 13 (6–19) mg; transversalis fascia 11 (4–26) mg; erector spinae 11 (10–32); transverse abdominis 9 (4–13) mg; wound catheter infusion 8 (2–15) mg; quadratus lumborum 8 (1–15) mg; wound infiltration 8 (2–13) mg; and no intervention −4 (−10 to 2) mg. Ordered efficacies for injection sites were different for other relevant outcomes, including pain (to 4–6 h and to 24 h) and time to rescue analgesia: there was no single preferred route of injection. The ordered mean (95% credible interval) reduction in dynamic pain scores (0–10 scale) at 24 h compared with placebo were as follows: wound infusion 1.2 (0.2–2.1); erector spinae 1.3 (−0.5 to 3.1); quadratus lumborum 1.0 (0.1–1.8); ilio‐inguinal–iliohypogastric 0.6 (−0.5 to 1.8); transverse abdominis 0.6 (−0.1 to 1.2); wound infiltration 0.5 (−0.3 to 1.3); transversalis fascia −0.8 (−3.4 to 1.9); ilio‐inguinal −0.9 (−3.6 to 1.7); and no intervention −0.8 (−1.8 to 0.2). We categorised our confidence in effect sizes as low or very low. [ABSTRACT FROM AUTHOR]

There are, however, a number of other abdominal nerve block techniques that have been used following CS, some of which are better known than others: we can now choose between a landmark- or ultrasound-guided TAP block, quadratus lumborum block, ilio-inguinal nerve block (alone or in combination with an iliohypogastric nerve block) and transversalis nerve block, among others [8]. Pre-operative risk factors for increased pain after CS include: younger age; maternal request for CS; low maternal weight; pre-operative pain and pain intensity; pre-operative scar hyperalgesia; and sleep deprivation [19-21]. Keywords: analgesia; caesarean section; chronic pain; nerve block; postoperative pain; pregnancy EN analgesia caesarean section chronic pain nerve block postoperative pain pregnancy 376 379 4 03/22/22 20220401 NES 220401 Caesarean section (CS) is the most commonly performed surgical procedure worldwide, and internationally the CS rate continues to rise. [Extracted from the article]

Summary: The decision‐to‐delivery interval is a widely used term at non‐elective caesarean section. While the definition may appear self‐evident, there is no universally agreed consensus about when this period begins and ends. We reviewed the literature for original research utilising the terms 'decision‐to‐delivery', 'decision‐to‐incision' or 'incision‐to‐delivery' and examined definitions used for decision, delivery, incision, as well as any additional time intervals that were assessed. Our analysis demonstrated an inconsistent non‐standardised approach to defining these intervals, which might have clinical practice and medicolegal ramifications. We propose that the decision‐to‐delivery interval should be defined as follows: the interval between the time at which the senior obstetrician makes the decision that a caesarean section is required and the time at which the fetus (or first fetus in the case of multiples) is delivered. The decision time should ideally be recorded contemporaneously in the medical notes or partogram. [ABSTRACT FROM AUTHOR]

Summary: Oxytocin is one of the most commonly used medications during labour and delivery. Recent insights from basic neuroscience research suggest that the uterotonic effects of oxytocin may arguably be trivial when compared with its profound effects on higher‐order human behaviour. The purpose of this review is to highlight the potential consequences of manipulating oxytocinergic signalling during the peripartum period and its long‐term impact on the maternal‐infant dyad. We identified four domains where modulation of oxytocinergic signalling might be consequential: postpartum depression; breastfeeding; neurodevelopment; and chronic pain, and performed a literature search to address the impact of peripartum oxytocin administration. We have shown modest, but inconsistent, evidence linking peripartum oxytocin administration with postpartum depression. Breastfeeding success appeared to be negatively correlated with peripartum oxytocin exposure, perhaps secondary to impaired primitive neonatal reflexes and maternal‐infant bonding. The association between perinatal oxytocin exposure and subsequent development of neurodevelopmental disorders such as autism in the offspring was weak, but these studies were limited by the lack of information on the cumulative dose. Finally, we identified substantial evidence for analgesic and anti‐hypersensitivity effects of oxytocin which might partly explain the low incidence of chronic pain after caesarean birth. Although most data presented here are observational, our review points to a compelling need for robust clinical studies to better dissect the impact of peripartum oxytocin administration, and as stewards of its use, increase the precision with which we administer oxytocin to prevent overuse of the drug. [ABSTRACT FROM AUTHOR]

General anaesthesia is known to achieve the shortest decision-to-delivery interval for category-1 caesarean section. We investigated whether the COVID-19 pandemic affected the decision-to delivery interval and influenced neonatal outcomes in patients who underwent category-1 caesarean section. Records of 562 patients who underwent emergency caesarean section between 1 April 2019 and 1 July 2019 in seven UK hospitals (pre-COVID-19 group) were compared with 577 emergency caesarean sections performed during the same period during the COVID-19 pandemic (1 April 2020-1 July 2020) (post-COVID-19 group). Primary outcome measures were: decision-to-delivery interval; number of caesarean sections achieving decision-to-delivery interval < 30 min; and a composite of adverse neonatal outcomes (Apgar 5-min score < 7, umbilical arterial pH < 7.10, neonatal intensive care unit admission and stillbirth). The use of general anaesthesia decreased significantly between the pre- and post-COVID-19 groups (risk ratio 0.48 (95%CI 0.37-0.62); p < 0.0001). Compared with the pre-COVID-19 group, the post-COVID-19 group had an increase in median (IQR [range]) decision-to-delivery interval (26 (18-32 [4-124]) min vs. 27 (20-33 [3-102]) min; p = 0.043) and a decrease in the number of caesarean sections meeting the decision-to-delivery interval target of < 30 min (374/562 (66.5%) vs. 349/577 (60.5%); p = 0.02). The incidence of adverse neonatal outcomes was similar in the pre- and post-COVID-19 groups (140/568 (24.6%) vs. 140/583 (24.0%), respectively; p = 0.85). The small increase in decision-to-delivery interval observed during the COVID-19 pandemic did not adversely affect neonatal outcomes. [ABSTRACT FROM AUTHOR]

Summary: If an accidental dural puncture occurs, one option is to insert a catheter and use it as an intrathecal catheter. This avoids the need for a further injection and can rapidly provide labour analgesia and anaesthesia for caesarean section. However, there are no recommendations for managing intrathecal catheters and, therefore, significant variation in clinical practice exists. Mismanagement of the intrathecal catheter can lead to increased motor block, high spinal anaesthesia, drug error, hypotension and fetal bradycardia. Care must be taken with an intrathecal catheter to adhere to strict aseptic technique, meticulous labelling, cautious administration of medications and good communication with the patient and other staff. Every institution considering the use of intrathecal catheters should establish a protocol. For labour analgesia, we recommend the use of dilute local anaesthetic agents and opioids. For caesarean section anaesthesia, gradual titration to the level of the fourth thoracic dermatome, with full monitoring, in a facility equipped to manage complications, should be performed using local anaesthetics combined with lipophilic opioids and morphine or diamorphine. Although evidence of the presence and duration of intrathecal catheters on the development of post‐dural puncture headache and need for epidural blood patch is limited, we suggest considering leaving the intrathecal catheter in for 24 hours to reduce the chance of developing a post‐dural puncture headache while maintaining precautions to avoid drug error and cerebrospinal fluid leakage. Injection of sterile normal saline into the intrathecal catheter may reduce post‐dural puncture headache. The level of evidence for these recommendations was low. [ABSTRACT FROM AUTHOR]

Summary: Accidental dural puncture is a recognised complication of labour epidural placement and can cause a debilitating headache. We examined the association between labour epidural case volume and accidental dural puncture rate in specialist anaesthetists and anaesthesia trainees. We performed a retrospective cohort study of labour epidural and combined spinal‐epidural nerve blocks performed between 1 July 2013 and 31 December 2017 at Waitemata District Health Board, Auckland, New Zealand. The mean (SD) annual number of obstetric epidural and combined spinal‐epidural procedures for high‐case volume specialists was 44.2 (15.0), and for low‐case volume specialists was 10.0 (6.8), after accounting for caesarean section combined spinal‐epidural procedures. Analysis of 7976 labour epidural and combined spinal‐epidural procedure records revealed a total of 92 accidental dural punctures (1.2%). The accidental dural puncture rate (95%CI) in high‐case volume specialists was 0.6% (0.4–0.9%) and in low‐case volume specialists 2.4% (1.4–3.9%), indicating probable skill decay. The odds of accidental dural puncture were 3.77 times higher for low‐ compared with high‐case volume specialists (95%CI 1.72–8.28, p = 0.001). Amongst trainees, novices had a significantly higher accidental dural puncture complication rate (3.1%) compared with registrars (1.2%), OR (95%CI) 0.39 (0.18–0.84), p = 0.016, or fellows (1.1%), 0.35 (0.16–0.76), p = 0.008. Accidental dural puncture complication rates decreased once trainees progressed past the 'novice' training stage. [ABSTRACT FROM AUTHOR]

Summary: Prophylactic oxytocin administration at the third stage of labour reduces blood loss and the need for additional uterotonic drugs. Obesity is known to be associated with an increased risk of uterine atony and postpartum haemorrhage. It is unknown whether women with obesity require higher doses of oxytocin in order to achieve adequate uterine tone after delivery. The purpose of this study was to establish the bolus dose of oxytocin required to initiate effective uterine contraction in 90% of women with obesity (the ED90) at elective caesarean delivery. We conducted a double‐blind dose‐finding study using the biased coin up‐down design method. Term pregnant women with a BMI ≥ 40 kg.m−2 undergoing elective caesarean delivery under regional anaesthesia were included. Those with conditions predisposing to postpartum haemorrhage were not included. Oxytocin was administered as an intravenous bolus over 1 minute upon delivery of the fetus. With the first woman receiving 0.5 IU, oxytocin doses were administered according to a sequential allocation scheme. The primary outcome measure was satisfactory uterine tone, as assessed by the operating obstetrician 2 minutes after administration of the oxytocin bolus. Secondary outcomes included the need for rescue uterotonic drugs, adverse effects and estimated blood loss. We studied 30 women with a mean (SD) BMI of 52.3 (7.6) kg.m‐2. The ED90 for oxytocin was 0.75 IU (95%CI 0.5–0.93 IU) by isotonic regression and 0.78 IU (95%CI 0.68–0.88 IU) by the Dixon and Mood method. Our results suggest that women with a BMI ≥ 40 kg.m‐2 require approximately twice as much oxytocin as those with a BMI < 40 kg.m‐2, in whom an ED90 of 0.35 IU (95%CI 0.15–0.52 IU) has previously been demonstrated. [ABSTRACT FROM AUTHOR]

Summary: Hyperbaric bupivacaine spinal anaesthesia remains the gold standard for elective caesarean section, but the resultant clinical effects can be unpredictable. Hyperbaric prilocaine induces shorter motor block but has not previously been studied in the obstetric spinal anaesthesia setting. We aimed to compare duration of motor block after spinal anaesthesia with prilocaine or bupivacaine during elective caesarean section. In this prospective randomised, double‐blind study, women with uncomplicated pregnancy undergoing elective caesarean section were eligible for inclusion. Exclusion criteria included: patients aged < 18 years; height < 155 cm or > 175 cm; a desire to breastfeed; or a contra‐indication to spinal anaesthesia. Patients were randomly allocated to two groups: the prilocaine group underwent spinal anaesthesia with 60 mg intrathecal prilocaine; and the bupivacaine group received 12.5 mg intrathecal heavy bupivacaine. Both 2.5 µg sufentanil and 100 µg morphine were added to the local anaesthetic agent in both groups. The primary outcome was duration of motor block, which was assessed every 15 min after arriving in the post‐anaesthetic care unit. Maternal haemodynamics, APGAR scores, pain scores, patient satisfaction and side‐effects were recorded. Fifty patients were included, with 25 randomly allocated to each group. Median (IQR [range]) motor block duration was significantly shorter in the prilocaine group, 158 (125–188 [95–249]) vs. 220 (189–250 [89–302]) min, p < 0.001. Median length of stay in the post‐anaesthetic care unit was significantly shorter in the prilocaine group, 135 (120–180 [120–230]) vs. 180 (150–195 [120–240]) min, p = 0.009. There was no difference between groups for: maternal intra‐operative hypotension; APGAR score; umbilical cord blood pH; maternal postoperative pain; and patients' or obstetricians' satisfaction. We conclude that hyperbaric prilocaine induces a shorter and more reliable motor block than hyperbaric bupivacaine for women with uncomplicated pregnancy undergoing elective caesarean section. [ABSTRACT FROM AUTHOR]

Summary: Caesarean section is associated with moderate‐to‐severe postoperative pain, which can influence postoperative recovery and patient satisfaction as well as breastfeeding success and mother‐child bonding. The aim of this systematic review was to update the available literature and develop recommendations for optimal pain management after elective caesarean section under neuraxial anaesthesia. A systematic review utilising procedure‐specific postoperative pain management (PROSPECT) methodology was undertaken. Randomised controlled trials published in the English language between 1 May 2014 and 22 October 2020 evaluating the effects of analgesic, anaesthetic and surgical interventions were retrieved from MEDLINE, Embase and Cochrane databases. Studies evaluating pain management for emergency or unplanned operative deliveries or caesarean section performed under general anaesthesia were excluded. A total of 145 studies met the inclusion criteria. For patients undergoing elective caesarean section performed under neuraxial anaesthesia, recommendations include intrathecal morphine 50–100 µg or diamorphine 300 µg administered pre‐operatively; paracetamol; non‐steroidal anti‐inflammatory drugs; and intravenous dexamethasone administered after delivery. If intrathecal opioid was not administered, single‐injection local anaesthetic wound infiltration; continuous wound local anaesthetic infusion; and/or fascial plane blocks such as transversus abdominis plane or quadratus lumborum blocks are recommended. The postoperative regimen should include regular paracetamol and non‐steroidal anti‐inflammatory drugs with opioids used for rescue. The surgical technique should include a Joel‐Cohen incision; non‐closure of the peritoneum; and abdominal binders. Transcutaneous electrical nerve stimulation could be used as analgesic adjunct. Some of the interventions, although effective, carry risks, and consequentially were omitted from the recommendations. Some interventions were not recommended due to insufficient, inconsistent or lack of evidence. Of note, these recommendations may not be applicable to unplanned deliveries or caesarean section performed under general anaesthesia. [ABSTRACT FROM AUTHOR]

Summary: There are no current descriptions of general anaesthesia characteristics for obstetric surgery, despite recent changes to patient baseline characteristics and airway management guidelines. This analysis of data from the direct reporting of awareness in maternity patients' (DREAMY) study of accidental awareness during obstetric anaesthesia aimed to describe practice for obstetric general anaesthesia in England and compare with earlier surveys and best‐practice recommendations. Consenting patients who received general anaesthesia for obstetric surgery in 72 hospitals from May 2017 to August 2018 were included. Baseline characteristics, airway management, anaesthetic techniques and major complications were collected. Descriptive analysis, binary logistic regression modelling and comparisons with earlier data were conducted. Data were collected from 3117 procedures, including 2554 (81.9%) caesarean deliveries. Thiopental was the induction drug in 1649 (52.9%) patients, compared with propofol in 1419 (45.5%). Suxamethonium was the neuromuscular blocking drug for tracheal intubation in 2631 (86.1%), compared with rocuronium in 367 (11.8%). Difficult tracheal intubation was reported in 1 in 19 (95%CI 1 in 16–22) and failed intubation in 1 in 312 (95%CI 1 in 169–667). Obese patients were over‐represented compared with national baselines and associated with difficult, but not failed intubation. There was more evidence of change in practice for induction drugs (increased use of propofol) than neuromuscular blocking drugs (suxamethonium remains the most popular). There was evidence of improvement in practice, with increased monitoring and reversal of neuromuscular blockade (although this remains suboptimal). Despite a high risk of difficult intubation in this population, videolaryngoscopy was rarely used (1.9%). [ABSTRACT FROM AUTHOR]

At the onset of the global pandemic of COVID-19 (SARS-CoV-2), guidelines recommended using regional anaesthesia for caesarean section in preference to general anaesthesia. National figures from the UK suggest that 8.75% of over 170,000 caesarean sections are performed under general anaesthetic. We explored whether general anaesthesia rates for caesarean section changed during the peak of the pandemic across six maternity units in the north-west of England. We analysed anaesthetic information for 2480 caesarean sections across six maternity units from 1 April to 1 July 2020 (during the pandemic) and compared this information with data from 2555 caesarean sections performed at the same hospitals over a similar period in 2019. Primary outcome was change in general anaesthesia rate for caesarean section. Secondary outcomes included overall caesarean section rates, obstetric indications for caesarean section and regional to general anaesthesia conversion rates. A significant reduction (7.7 to 3.7%, p < 0.0001) in general anaesthetic rates, risk ratio (95%CI) 0.50 (0.39-0.93), was noted across hospitals during the pandemic. Regional to general anaesthesia conversion rates reduced (1.7 to 0.8%, p = 0.012), risk ratio (95%CI) 0.50 (0.29-0.86). Obstetric indications for caesarean sections did not change (p = 0.17) while the overall caesarean section rate increased (28.3 to 29.7%), risk ratio (95%CI) 1.02 (1.00-1.04), p = 0.052. Our analysis shows that general anaesthesia rates for caesarean section declined during the peak of the pandemic. Anaesthetic decision-making, recommendations from anaesthetic guidelines and presence of an on-site anaesthetic consultant in the delivery suite seem to be the key factors that influenced this decline. [ABSTRACT FROM AUTHOR]

Summary: Caesarean delivery is the most commonly performed inpatient surgical procedure globally. Pain after caesarean delivery is moderate to severe if not adequately treated, and is a primary anaesthetic concern for patients. Transversus abdominis plane and quadratus lumborum blocks are fascial plane blocks that have the potential to improve analgesia following caesarean delivery. Although proponents of the quadratus lumborum block suggest that this technique may provide better analgesia compared with transversus abdominis plane block, there are limited data directly comparing these two techniques. We, therefore, performed a systematic review and network meta‐analysis to compare transversus abdominis plane and quadratus lumborum block approaches, seeking randomised controlled trials comparing both techniques to each other, or to control, with or without intrathecal morphine. In all, 31 trials with 2188 patients were included and our primary outcome, the cumulative intravenous morphine equivalent consumption at 24 h, was reported in 12 trials. In the absence of intrathecal morphine, transversus abdominis plane and quadratus lumborum blocks were equivalent, and both were superior to control (moderate‐quality evidence). In the presence of intrathecal morphine, no differences were found between control, transversus abdominis plane and quadratus lumborum blocks (moderate‐quality evidence). Similar results were found for resting and active pain scores at 4–6 h, 8–12 h, 24 h and 36 h, although quadratus lumborum block was associated with lower pain scores at 36 h when compared with transversus abdominis plane block (very low‐quality evidence). However, transversus abdominis plane block was associated with a reduced incidence of postoperative nausea and vomiting (moderate‐quality evidence) and sedation when compared with inactive control following intrathecal morphine administration (low‐quality evidence). There are insufficient data to draw definitive conclusions, but transversus abdominis plane and quadratus lumborum block appear to be superior to control in the absence of intrathecal morphine, but provide limited additional benefit over inactive control when intrathecal morphine is also used. [ABSTRACT FROM AUTHOR]

Summary: Caesarean delivery is the most commonly performed inpatient surgical procedure globally. Pain after caesarean delivery is moderate to severe if not adequately treated, and is a primary anaesthetic concern for patients. Transversus abdominis plane and quadratus lumborum blocks are fascial plane blocks that have the potential to improve analgesia following caesarean delivery. Although proponents of the quadratus lumborum block suggest that this technique may provide better analgesia compared with transversus abdominis plane block, there are limited data directly comparing these two techniques. We, therefore, performed a systematic review and network meta‐analysis to compare transversus abdominis plane and quadratus lumborum block approaches, seeking randomised controlled trials comparing both techniques to each other, or to control, with or without intrathecal morphine. In all, 31 trials with 2188 patients were included and our primary outcome, the cumulative intravenous morphine equivalent consumption at 24 h, was reported in 12 trials. In the absence of intrathecal morphine, transversus abdominis plane and quadratus lumborum blocks were equivalent, and both were superior to control (moderate‐quality evidence). In the presence of intrathecal morphine, no differences were found between control, transversus abdominis plane and quadratus lumborum blocks (moderate‐quality evidence). Similar results were found for resting and active pain scores at 4–6 h, 8–12 h, 24 h and 36 h, although quadratus lumborum block was associated with lower pain scores at 36 h when compared with transversus abdominis plane block (very low‐quality evidence). However, transversus abdominis plane block was associated with a reduced incidence of postoperative nausea and vomiting (moderate‐quality evidence) and sedation when compared with inactive control following intrathecal morphine administration (low‐quality evidence). There are insufficient data to draw definitive conclusions, but transversus abdominis plane and quadratus lumborum block appear to be superior to control in the absence of intrathecal morphine, but provide limited additional benefit over inactive control when intrathecal morphine is also used. [ABSTRACT FROM AUTHOR]

Since uterine atony is the most common cause of postpartum haemorrhage, we believe uterine tone is an appropriate, pragmatic and clinically relevant outcome to study, as clinical decisions are based on this assessment [[6]]. In our study, the uterine tone VNRS for the standard treatment/high dose (S) was higher compared with the new treatment/low dose (T). Their letter raises interesting points regarding the interpretation of non-inferiority trials and the use of a verbal numerical rating scale (VNRS) for uterine tone assessment as the primary outcome. [Extracted from the article]

Non-inferiority can be inferred for carbetocin but not for oxytocin. gl Consequently, McDonagh et al. [[1]] incorrectly infer non-inferiority for oxytocin 0.5 IU compared with oxytocin 5 IU at 2 min as the upper bound, 1.89, is > 1.2. We read with interest the study by McDonagh et al. [[1]] who reported a randomised controlled, non-inferiority trial comparing low-dose oxytocin (0.5 IU) and carbetocin (20 g) with the more traditional high dose (5 IU and 100 g respectively) regimens for elective caesarean delivery. Carbetocin vs. oxytocin at elective caesarean delivery: challenges and complexities in performing and interpreting a non-inferiority trial. [Extracted from the article]

However, the new recommendation that erector spinae plane (ESP) block is an alternative to long-acting neuraxial opioids for analgesia after caesarean section was unexpected. Boules et al. studied 60 women scheduled for elective caesarean section under spinal anaesthesia without neuraxial opioids who were allocated randomly to receive ESP block or transversus abdominis plane (TAP) block. We read with great interest the updated PROSPECT guideline for elective caesarean section [[1]]. [Extracted from the article]

" I Use of i.v. dexamethasone was associated with better pain scores; prolongation of analgesic effect... i " [[3]] Participants in this trial had less than the ED SB 95 sb of bupivacaine [[8]] and no additional intrathecal opioid. Anesthesia: Essays and Researches 2017; 11: 321 - 5. 4 Ituk U, Thenuwara K. The effect of a single intraoperative dose of intravenous dexamethasone 8 mg on post-cesarean delivery analgesia: a randomised controlled trial. The PROSPECT group recently added an update [[1]] to their original recommendations for the management of post-caesarean section pain [[2]]. [Extracted from the article]

Anesthesia: Essays and Researches 2017; 11: 321 - 5. 4 Ituk U, Thenuwara K. The effect of a single intraoperative dose of intravenous dexamethasone 8mg on post-cesarean delivery analgesia: a randomised controlled trial. It has positive analgesic effects which are more potent when no intrathecal long acting opioids are used, and when morphine is given intrathecally it provides modest analgesic effects, but is also anti-emetic. We thank Dr Geoghegan [[1]] for his interest in the updated PROSPECT recommendations for postoperative analgesia for elective caesarean delivery [[2]]. [Extracted from the article]

Erector spinae plane block and transversus abdominis plane block for postoperative analgesia in caesarean section: a prospective randomized comparative study. However, time to first request for rescue analgesia was prolonged and rescue opioid consumption was significantly reduced in the ESP block group compared with intrathecal morphine and transversus abdominis plane (TAP) block. We thank our colleagues, Coppens et al. [[1]] for their interest in the updated PROSPECT recommendations for postoperative analgesia for elective caesarean delivery [[2]]. [Extracted from the article]

This narrative review discusses recent evidence surrounding the use of regional anaesthesia in the obstetric setting, including intrapartum techniques for labour and operative vaginal delivery, and caesarean delivery. Pudendal nerve blockade, ideally administered by an obstetrician, should be considered for operative vaginal delivery if neuraxial analgesia is contraindicated. Regional techniques are increasingly utilised in clinical practice for caesarean delivery to minimise opioid consumption, reduce pain, improve postpartum recovery and facilitate earlier discharge as part of enhanced recovery protocols. The evidence surrounding transversus abdominis plane and quadratus lumborum blockade supports their use when: long-acting neuraxial opioids cannot be administered due to contraindications; if emergency delivery necessitates general anaesthesia; or as a postoperative rescue technique. Current data suggest quadratus lumborum blockade is no more effective than transversus abdominis plane blockade after caesarean delivery. Transversus abdominis plane blockade, wound catheter insertion and single shot wound infiltration are all effective techniques for reducing postoperative opioid consumption, with transversus abdominis plane blockade favoured, followed by wound catheters and then wound infiltration. Ilio-inguinal and iliohypogastric, erector spinae plane and rectus sheath blockade all require further studies to determine their efficacy for caesarean delivery in the presence or absence of long-acting neuraxial opioids. Future studies are needed to: compare approaches for individual techniques; determine which combinations of techniques and dosing regimens result in optimal analgesic and recovery outcomes following delivery; and elucidate the populations that benefit most from regional anaesthesia in the obstetric setting. [ABSTRACT FROM AUTHOR]

We reviewed the literature on management of general and regional anaesthesia in pregnant women with anticipated airway difficulty. We identified 138 publications comprising 158 cases; these either described equipment or techniques for the provision of general anaesthesia, or the management of women with regional analgesia or anaesthesia, with the aim of avoiding general anaesthesia. Most of the former group described women requiring caesarean section alone, or in combination with other surgery, which was sometimes airway-related. Management techniques were largely similar to those in non-obstetric patients requiring surgery who have airway difficulties, although suggested differences related to physiological changes of pregnancy and avoidance of nasal intubation. In the reports discussing regional anaesthesia, consideration was often given to the possible requirement for urgent out-of-hours anaesthetic intervention, and the predicted difficulty of management of general anaesthesia should it be required. In a number of reported cases, multidisciplinary planning led to the conclusion that elective caesarean section should be performed in order to avoid emergency airway management. Based on this literature review, we advise antenatal planning that includes: assessment of the patient's clinical characteristics; consideration of the equipment and personnel available to provide safe airway management out-of-hours; and elective caesarean section should these be lacking. If general anaesthesia is required, a risk assessment must be made as to the probability of safe airway management after the induction of anaesthesia, and awake tracheal intubation should be used if this cannot be assured. Decision aids are provided to illustrate these points. Online appendices include a comprehensive compendium of case reports on the management of a number of rare syndromes and airway conditions. [ABSTRACT FROM AUTHOR]

Phenylephrine is recommended for the management of hypotension after spinal anaesthesia in women undergoing caesarean section. Noradrenaline, an adrenergic agonist with weak β-adrenergic activity, has been reported to have a more favourable haemodynamic profile than phenylephrine. However, there are concerns that noradrenaline may be associated with a higher risk of fetal acidosis, defined as an umbilical artery pH < 7.20. We performed a systematic review of trials comparing noradrenaline with phenylephrine, concentrating on primary outcomes of fetal acidosis and maternal hypotension. We identified 13 randomised controlled trials including 2002 patients. Heterogeneity among the studies was high, and there were too few data to calculate a pooled effect estimate. Fetal acidosis was assessed in four studies that had a low risk of bias and a low risk of confounding, that is, studies which used a prophylactic vasopressor and where women received the allocated vasopressor only. There were no significant differences between these studies. No significant differences were observed for hypotension. Two trials found a significantly lower incidence of bradycardia when using noradrenaline. Cardiac output was significantly higher after noradrenaline in two of three studies. For other secondary outcomes including nausea, vomiting and Apgar scores at 1 and 5 min, no studies found significant differences. The evidence so far is too limited to support an advantage of noradrenaline over phenylephrine. Concerns of a deleterious effect of noradrenaline on fetal blood gas status cannot currently be assuaged by the available data from randomised controlled studies. [ABSTRACT FROM AUTHOR]

Using biased-coin sequential allocation, we sought to determine the effective time interval in 90% of healthy parturients to achieve a target endpoint end-tidal oxygen of ≥ 90% using standard flow rate facemask and high-flow nasal oxygen. Eighty healthy parturients were randomly assigned to standard facemask (n = 40) or high-flow nasal oxygen (n = 40) groups; half of the parturients in the high-flow nasal oxygen group also used a simple no-flow facemask to minimise air entrainment. The effective time interval for 90% of parturients to achieve the target endpoint for standard facemask was 3.6 min (95%CI 3.3-6.7 min), but could not be estimated for the high-flow nasal oxygen groups with or without an additional simple facemask, as eight minutes was insufficient to achieve the target endpoint for 55% and 92% of parturients, respectively. Furthermore, after three minutes, the target endpoint was reached by 71% in the standard facemask group vs. 0% in the high-flow nasal oxygen groups. After four minutes, the target endpoint was reached by 100% in the standard facemask, 80% in the high-flow nasal oxygen with simple facemask and 67% in the high-flow nasal oxygen groups. Beyond four minutes, there was no improvement in pre-oxygenation success using high-flow nasal oxygen. In conclusion, under the conditions of our study, the effective time interval for 90% of parturients to achieve an end-tidal oxygen ≥ 90% for standard flow rate facemask was estimated to be 3.6 min, but could not be estimated for high-flow nasal oxygen groups even after eight minutes. [ABSTRACT FROM AUTHOR]

Rapid-onset epidural local anaesthesia can avoid general anaesthesia for caesarean delivery. We performed a Bayesian network meta-analysis of direct and indirect comparisons to rank speed of onset of the six local anaesthetics most often used epidurally for surgical anaesthesia for caesarean delivery. We searched Google Scholar, PubMed, EMBASE, Ovid, CINAHL and CENTRAL to June 2019. We analysed 24 randomised controlled trials with 1280 women. The mean (95%CrI) onset after bupivacaine 0.5% was 19.8 (17.3-22.4) min, compared with which the mean (95%CrI) speed of onset after lidocaine 2% with bicarbonate, 2-chloroprocaine 3% and lidocaine 2% was 6.4 (3.3-9.6) min faster, 5.7 (3.0-8.3) min faster and 3.9 (1.8-6.0) min faster, respectively. Speed of onset was similar to bupivacaine 0.5% after ropivacaine 0.75% and l-bupivacaine 0.5%: 1.6 (-1.4 to 4.8) min faster and 0.4 (-2.2 to 3.0) min faster, respectively. The rate (95%CrI) of intra-operative hypotension was least after l-bupivacaine 0.5%, 315 (236-407) per 1000, and highest after 2-chloroprocaine 3%, 516 (438-594) per 1000. The rate (CrI) of intra-operative supplementation of analgesia was least after ropivacaine 0.75% 48 (19-118) per 1000 and highest after 2-chloroprocaine 3%, 250 (112-569) per 1000. [ABSTRACT FROM AUTHOR]

A three-stage Delphi survey process was undertaken to identify the quality indicators considered the most relevant to obstetric anaesthesia. The initial quality indicators assessed were derived from national peer-reviewed publications and were divided into service provision, service quality and clinical outcomes. A range of stakeholders were invited to participate and divided into three panels: obstetric anaesthetists; other maternity care health professionals; and women who had used maternity services. In total, 133 stakeholders registered to participate with 80% completing all three phases of the survey process. Participants ranked indicators for their relative importance using the grading of recommendations assessment, development and evaluation scale. From an initial list of 31 quality indicators, 11 indicators were rated as extremely important by > 90% of participants in at least two panels. These 11 indicators were presented to stakeholders; they were asked to vote for the five indicators they considered most relevant and useful for assessing and benchmarking the quality of obstetric anaesthesia provided. The indicators chosen were: the percentage of women who had an epidural/combined spinal-epidural for labour analgesia with accidental dural puncture; the presence of guidelines for the referral of patients to an anaesthetist for antenatal review; whether there are dedicated elective caesarean section lists; the availability of point-of-care testing for estimation of haemoglobin concentration; and the percentage of epidurals for labour analgesia that provided adequate pain relief within 45 min of the start of epidural insertion. These indicators may be used for quality improvement and national benchmarking to support the implementation of quality standards in obstetric anaesthesia. [ABSTRACT FROM AUTHOR]

Spinal hypotension is a common and clinically important problem during caesarean section. Current consensus recommendations for resource-rich settings suggest the use of a titrated phenylephrine infusion, in combination with fluid coloading, for prevention of maternal hypotension. In resource-limited settings, where syringe drivers are unavailable, these recommendations advise the addition of 500 μg phenylephrine to the first 1 l of intravenous fluid given after initiation of spinal anaesthesia, with additional vasopressor boluses as required. This prospective, alternating intervention study compared the use of a conventional phenylephrine rescue bolus strategy for prevention of hypotension, defined as systolic arterial pressure < 90 mmHg, with a phenylephrine infusion given according to the consensus recommendation. We studied 300 women having elective caesarean section. There were 77 (51%) women who developed hypotension in the bolus group vs. 55 (37%) in the phenylephrine infusion group (p = 0.011). This represented a 29% reduction in hypotension, with a number needed to treat of 6.8. The six highest systolic arterial pressure readings occurred in the phenylephrine infusion group (range 166-188 mmHg), and there were four instances of bradycardia (heart rate < 50 beats.min-1 ) with preserved systolic arterial pressure in each group. There were no adverse clinical sequelae, and no differences in neonatal Apgar scores in either group. The consensus recommendation for phenylephrine and fluid co-administration in resource-limited settings appears effective in preventing maternal hypotension, but at the cost of sporadic systolic hypertension. [ABSTRACT FROM AUTHOR]

Postpartum haemorrhage is a leading cause of maternal death during childbirth. There is an increasing incidence of atonic postpartum haemorrhage in developed countries, and maternal obesity has been proposed as a contributing factor. The dose-response relationship of carbetocin in obese women has not yet been determined. We conducted a double-blind, dose-finding study of carbetocin using a biased coin up-and-down design in women with a body mass index ≥ 40 kg.m-2 undergoing elective caesarean section. The determinant for a successful response was satisfactory uterine tone, with no intra-operative need for additional uterotonic drugs. Secondary outcomes included the use of additional uterotonic drugs postoperatively, estimated blood loss and adverse effects of carbetocin administration. Thirty women were recruited to the study. The median (IQR [range]) body mass index was 44.93 (41.5-55.2 [40-66.5]) kg.m-2 . The ED90 of carbetocin was estimated as 62.9 (95%CI 57.0-68.7) μg using the truncated Dixon and Mood method, and 68 (95%CI 52-77) μg using the isotonic regression method. The estimated blood loss was 880 (621-1178 [75-2442]) ml. The overall rates of hypotension and hypertension after delivery were 40% and 6.7%, respectively, while nausea occurred in 26.7% of women. The ED90 for carbetocin in obese women at elective caesarean section is lower than the dose of 100 μg currently recommended by the Society of Obstetricians and Gynaecologists of Canada, but is approximately four times higher than the previously demonstrated ED90 of 14.8 μg in women with body mass index < 40 kg.m-2 . [ABSTRACT FROM AUTHOR]

Quadratus lumborum block has been shown to provide satisfactory analgesia after caesarean section performed under neuraxial anaesthesia. However, its efficacy has not been demonstrated in patients who have received intrathecal morphine. The aim of this study was to assess the efficacy of quadratus lumborum block as part of a multimodal analgesic regimen including intrathecal morphine. This was a prospective, double-blind, placebo-controlled trial. Participants were randomly allocated to receive bilateral quadratus lumborum block (40 ml levobupivacaine 0.25%) or sham block (control) after undergoing elective caesarean section under spinal anaesthesia. The primary outcome was 24-h morphine consumption measured by patient-controlled analgesia. Secondary outcomes included pain scores and quality of recovery. Data from 86 women were analysed. Median (IQR [range]) 24-h morphine consumption was similar in patients receiving quadratus lumborum block and sham block (12 (8-29 [0-68]) mg vs. 14 (5-25 [0-90]) mg, respectively; p = 0.986). There was a reduction in median (IQR [range]) visual analogue scale pain scores at 6 h with quadratus lumborum block compared with sham block both at rest (6 (0-14 [0-98]) mm vs. 14 (3-23 [0-64]) mm (p = 0.019); and on movement: 23 (10-51 [0-99]) mm vs. 44 (27-61 [2-94]) mm; (p = 0.014)). There was no difference in pain scores at any other time-point up to 48 h. When used in conjunction with intrathecal morphine and spinal anaesthesia, bilateral quadratus lumborum block does not reduce 24-h morphine consumption after caesarean section. [ABSTRACT FROM AUTHOR]

Spinal anaesthesia for caesarean section commonly causes maternal hypotension. This systematic review and network meta-analysis compared methods to prevent hypotension in women receiving spinal anaesthesia for caesarean section. We selected randomised controlled trials that compared an intervention to prevent hypotension with another intervention or inactive control by searching MEDLINE and Embase, Web of Science to December 2018. There was no language restriction. Two reviewers extracted data on trial characteristics, methods and outcomes. We assessed risk of bias for individual trials (Cochrane tool) and quality of evidence (GRADE checklist). We assessed 109 trials (8561 women) and 12 different methods that resulted in 30 direct comparisons. Methods ranked by OR (95%CI) from most effective to least effective were: metaraminol 0.11 (0.04-0.26); norepinephrine 0.13 (0.06-0.28); phenylephrine 0.18 (0.11-0.29); leg compression 0.25 (0.14-0.43); ephedrine 0.28 (0.18-0.43); colloid given before induction of anaesthesia 0.38 (0.24-0.61); angiotensin 2, 0.12 (0.02-0.75); colloid given after induction of anaesthesia 0.52 (0.30-0.90); mephentermine 0.09 (0.01-1.30); crystalloid given after induction of anaesthesia 0.78 (0.46-1.31); and crystalloid given before induction of anaesthesia 1.16 (0.76-1.79). Phenylephrine caused maternal bradycardia compared with control, OR (95%CI) 0.23 (0.07-0.79). Ephedrine lowered umbilical artery pH more than phenylephrine, standardised mean difference (95%CI) 0.78 (0.47-1.49). We conclude that vasopressors should be given to healthy women to prevent hypotension during caesarean section with spinal anaesthesia. [ABSTRACT FROM AUTHOR]