Buprenorphine Versus Diclofenac for Pain Relief in Acute Pancreatitis: A Double-Blinded Randomized Controlled Trial.

BACKGROUND: Although both nonsteroidal anti-inflammatory drugs (NSAIDs) and opioids are used for analgesia in acute pancreatitis (AP), the analgesic of choice is not known. We compared buprenorphine, an opioid, and diclofenac, an NSAID, for analgesia in AP. METHODS: In a double-blind randomized controlled trial, AP patients were randomized to receive intravenous diclofenac or intravenous buprenorphine. Fentanyl was used as rescue analgesia, delivered through a patient-controlled analgesia pump. Primary outcome was the difference in the dose of rescue fentanyl required. Secondary outcomes were the number of effective and ineffective demands of rescue fentanyl, pain-free interval, reduction in visual analogue scale (VAS) score, adverse events, and organ failure development. RESULTS: Twenty-four patients were randomized to diclofenac and 24 to buprenorphine. The 2 groups were matched at baseline. The total amount of rescue fentanyl required was significantly lower in the buprenorphine group:130 µg, interquartile range (IQR), 80-255 vs 520 µg, IQR, 380-1065 (P < .001). The number of total demands was 32 (IQR, 21-69) in the diclofenac arm vs 8 (IQR, 4-15) in the buprenorphine arm (P < .001). The buprenorphine group had more prolonged pain-free interval (20 vs 4 hours; P < .001), with greater reduction in the VAS score at 24, 48, and 72 hours compared with the diclofenac group. These findings were confirmed in the subgroup of moderately severe/severe pancreatitis. Adverse events profile was similar in the 2 groups. CONCLUSIONS: Compared with diclofenac, buprenorphine appears to be more effective and equally safe for pain management in AP patients, even in the subcohort of moderately severe or severe pancreatitis (Trial Registration number: CTRI/2020/07/026914).

Postoperative pulmonary complications after major abdominal surgery in elderly patients and its association with patient-controlled analgesia.

OBJECTIVES: This study aims to identify the risk factors for postoperative pulmonary complications (PPCs) in elderly patients undergoing major abdominal surgery and to investigate the relationship between patient-controlled analgesia (PCA) and PPCs. DESIGN: A retrospective study. METHOD: Clinical data and demographic information of elderly patients (aged ≥ 60 years) who underwent upper abdominal surgery at the First Affiliated Hospital of Sun Yat-sen University from 2017 to 2019 were retrospectively collected. Patients with PPCs were identified using the Melbourne Group Scale Version 2 scoring system. A directed acyclic graph was used to identify the potential confounders, and multivariable logistic regression analyses were conducted to identify independent risk factors for PPCs. Propensity score matching was utilized to compare PPC rates between patients with and without PCA, as well as between intravenous PCA (PCIA) and epidural PCA (PCEA) groups. RESULTS: A total of 1,467 patients were included, with a PPC rate of 8.7%. Multivariable analysis revealed that PCA was an independent protective factor for PPCs in elderly patients undergoing major abdominal surgery (odds ratio = 0.208, 95% confidence interval = 0.121 to 0.358; P < 0.001). After matching, patients receiving PCA demonstrated a significantly lower overall incidence of PPCs (8.6% vs. 26.3%, P < 0.001), unplanned transfer to the intensive care unit (1.1% vs. 8.4%, P = 0.001), and in-hospital mortality (0.7% vs. 5.3%, P = 0.021) compared to those not receiving PCA. No significant difference in outcomes was observed between patients receiving PCIA or PCEA after matching. CONCLUSION: Patient-controlled analgesia, whether administered intravenously or epidurally, is associated with a reduced risk of PPCs in elderly patients undergoing major upper abdominal surgery.

A comparison of the effects of thoracolumbar interfascial plane (TLIP) block and erector spinae plane (ESP) block in postoperative acute pain in spinal surgery.

PURPOSE: Spinal surgeries are a very painful procedure. New regional techniques for postoperative pain management are being considered. The present study aimed to evaluate the hypothesis that the ultrasound-guided erector spinae plane (ESP) block would lead to lower opioid consumption compared to the thoracolumbar interfascial plane (TLIP) block after lumbar disk surgery. The study's primary objective was to compare postoperative total opioid consumption, and the secondary objective was to assess postoperative pain scores. METHODS: Sixty-eight patients who underwent elective lumbar disk surgery were randomly assigned to either the ESP block group or the TLIP block group. The current pain status of the patients in both the ESP and TLIP block groups was assessed using the Numerical Rating Scale (NRS) at specific time intervals (30 min, 1, 6, 12 and 24 h) during the postoperative period. The number of times patients administered a bolus dose of patient-controlled analgesia, (PCA) within the first 24 h was recorded. RESULTS: In the ESP group, the total opioid consumption in terms of morphine equivalents was found to be significantly lower (ESP group: 7.7 ± 7.0; TLIP group: 13.0 ± 10.1; p < 0.05). The NRS scores were similar between the groups at 30 min, 1, 6, and 12 h, but at 24 h, they were significantly lower in the ESP group. Moreover, the groups had no significant difference regarding observed side effects. CONCLUSION: This study demonstrated the analgesic efficacy of both techniques, revealing that the ESP block provides more effective analgesia in patients undergoing lumbar disk surgery.

Patient Evaluation of Patient-Controlled Analgesia for Pain Crises in Sickle Cell Disease.

BACKGROUND: Vaso-occlusive crisis causing severe pain can be seen in patients with sickle cell anemia and potent opioids should be used in this process. Although sickle cell disease (SCD) patients use patient-controlled analgesia (PCA), we encountered no study evaluating this method from the participants' perspective. AIM: This descriptive study aimed to evaluate the use and effectiveness of PCA administered using the Mersin Algology Protocol (MAP) during painful episodes of SCD based on participants reports. METHODS: After obtaining approval from the local ethics committee, 109 SCD participants using PCA as per the MAP between 2018 and 2020 were recruited for the study. The participants answered a 28-item questionnaire regarding their annual number of pain crises, sites of pain, knowledge about PCA, the number of times they used PCA, and the positive and negative aspects of the PCA method. RESULTS: The mean age of the participants was 28.80 ± 11.5 years. Ninety-nine (90.8%) of the participants considered PCA superior to other pain management methods they had used previously. The 53 participants (48.6%) who waited for their pain to worsen before administering the demand dose expressed fear of taking high doses of medication. As the number of times a participant used PCA increased, NRS scores for pain at the time of demand dosing decreased from 7-10 to 4-6 (p = .013). Eighty-five (78%) of the participants reported having no problems related to the device or drug while using PCA. CONCLUSION: We found that PCA was used more correctly by participants with more experience using the device. Participants who delay demand dosing do so because of anxiety about developing dependence and to avoid high doses.

Capabilities Toward Intravenous Patient-Controlled Analgesia: A Cross-Sectional Study of Registered Nurses Working in Two Tertiary Hospitals in China and Thailand.

BACKGROUND: An increased interest has been observed in the wide use of intravenous patient-controlled analgesia (IV-PCA) to control acute postoperative pain in both China and Thailand. The safety and efficacy of IV-PCA in patient care requires competent and capable staff nurses. This study aimed to appraise the capabilities of Thai and Chinese registered nurses regarding IV-PCA as a guide to develop educational programs. METHOD: A descriptive cross-sectional survey was conducted with 203 Chinese and 270 Thai registered nurses. An anonymous self-report questionnaire addressing 6 domains of capabilities toward IV-PCA was used to collect the data. Descriptive and inferential statistics were employed to analyze the data. RESULTS: The study found that the mean percentage scores (MPS) of the overall capability on IV-PCA of the Thai and Chinese nurse participants were 55.5 (mean [M] = 57.3, standard deviation [SD] = 4.9) and 62.6 (M = 58.7, SD = 13.0), respectively, which indicated very low and low levels. Barriers to the use and care of patients receiving IV-PCA after surgery according to the Thai and Chinese nurse participants included a lack of knowledge and systematic training regarding IV-PCA and a lack of first-hand experience in providing care for IV-PCA patients. CONCLUSION: The study results call for intensive and effective training and education concerning all domains for registered nurses involved with patients receiving IV-PCA.

ASPMN Position Statement: Authorized Agent Controlled Analgesia.

The American Society for Pain Management Nursing (ASPMN) has reviewed and updated its position statement on the use of authorized agent controlled analgesia (AACA) for patients who are unable to independently utilize a self-dosing analgesic infusion pump, commonly known as patient-controlled analgesia (PCA). ASPMN continues to support the use of AACA to provide timely and effective pain management while promoting equitable care for vulnerable patient populations who are unable to use PCA. ASPMN does not support the use of "PCA by Proxy" in which unauthorized individuals activate PCA for a patient. This position statement includes an updated review of the evidence related to AACA. Clinical practice recommendations for authorized agents, nurses, prescribers, and organizations are provided with an emphasis on the importance of appropriate authorized agent selection, education, diligent patient assessment and medication management.

Susceptibility of two different PCA pumps to inaccurate delivery associated with pole position at low flow-rates in a pediatric setting - an experimental study.

PURPOSE: Vertical displacement of infusion pumps used in patient-controlled analgesia can cause irregularities in drug delivery and is especially crucial at low flow rates, which are commonly used in pediatrics. There is only scarce data available regarding the extent of these inaccuracies. The current in vitro study therefore aimed at a comparison of the performance of two commonly used PCA pumps at different pole positions due to vertical displacement. METHODS: The Syramed® µSP6000 Chroma syringe infusion pump featuring a stepper motor drive was compared to the CADD®-Solis pump utilizing a linear peristaltic pump system at two different flow rates (0.3 ml/h and 1 ml/h) and three different levels of height (0, + 50 and - 50 cm). Flow patterns and delivered volumes were measured after every change in position and infusion boluses, retrograde aspiration volumes and zero-drug delivery time were calculated. RESULTS: The Syramed® pump was more susceptible to vertical displacement than the CADD®-Solis pump and showed overall greater inaccuracies in the delivered volumes as well as higher infusion boluses, retrograde aspiration volumes and zero-drug delivery time at both flow rates. CONCLUSION: The observed differences between the pumps might be explained by the higher compliance of this syringe pump and the diverse working mechanisms. Overall, the CADD®-Solis pump might be considered a preferable option for patient-controlled analgesia in children. It is nonetheless essential for medical staff to be aware of the effects of vertical displacement of PCA pumps and to minimize these displacements as much as possible.

Nurses' knowledge of and attitude toward postoperative patient-controlled analgesia (PCA) and the associated factors.

BACKGROUND: Postoperative pain control is pivotal for surgical care; it facilitates patient recovery. Although patient-controlled analgesia (PCA) has been available for decades, inadequate pain control remains. Nurses' knowledge of and attitude toward PCA may influence the efficacy on clinic application. PURPOSE: The purpose of this study is to evaluate nurses' knowledge of and attitude toward postoperative PCA and investigate the associated factors. METHODS: This is a cross-sectional study. We enrolled registered nurses from a 2200-bed medical center in northern Taiwan within one year. The participants completed an anonymous self-reported PCA knowledge inventory and PCA attitude inventory. Data were analyzed descriptively and associated were tested using logistic regression. RESULTS: With 303 participants enrolled, we discovered that nurses had limited knowledge of and a negative attitude toward PCA. Under half of the participants know how to set up a bolus dose and lockout intervals. The majority held misconceptions regarding side effect management for opioids. The minority agree to increase the dose when a patient experienced persistent pain or suggested the use of PCA. Surprisingly, participants with a bachelor's or master's degree had lower knowledge scores than those with a junior college degree. Those with 6-10 years of work experience also are lower than those with under 5 years of experience. However, the participants with experience of using PCA for patient care had higher knowledge scores and a more positive attitude. CONCLUSIONS: Although postoperative PCA has been available for decades and education programs are routinely provided, nurses had limited knowledge of and a negative attitude toward PCA. A higher education level and longer work experience were not associated with more knowledge. The current education programs on PCA should be revised to enhance their efficacy in delivering up-to-date knowledge and situation training which may convey supportive attitude toward clinical application of PCA.

Attenuation of acute postoperative pain and opioid requirement with the use of magnesium sulfate in patients undergoing limb amputations.

OBJECTIVE: To compare the effects of magnesium sulphate on the total dose of intravenous morphine consumption postoperatively following limb amputations along with rescue analgesia requirement, pain scores and side effects. METHODS: This prospective, triple-blinded, randomised controlled study was conducted from October 2021 to May 2022 at the Shaukat Khanum Memorial Cancer Hospital and Research Centre, Lahore, Pakistan, and comprised of patients scheduled for limb amputations. They were randomised into 2 equal groups. The anaesthesia protocol was uniform for all patients. Intervention group A was administered 30mg/kg loading dose and 10mg/kg/hr maintenance dose of magnesium sulphate intravenously, while patients in control group B received the same amount of plain isotonic saline. Morphine consumption, including that used for rescue analgesia and patient-controlled analgesia, was measured for 24 hours postoperatively. Numeric rating scale was used for the evaluation of postoperative pain in both groups at 15min, 1h, 2h, at discharge from the post-anaesthesia care unit and at 12h and 24h in the ward. Data was analysed using SPSS 23. RESULTS: Of the 24 patients enrolled, the study was completed by 20(83.33%). There were 10(50%) patients in group A; 8(40%) males and 2(20%) females with mean age 24.8±14.14 years and mean surgery time 130.5±47.86 minutes. There were 10(50%) patients in group B; 8(40%) males and 2(20%) females with mean age 23.2±7.4 years and mean surgery time 117±23.85 minutes (p>0.05). Total morphine used over 24 hours in group A was 16±3.1 mg compared to 29.6±11.2 mg in group B (p<0.05). The time for first use of patient-controlled analgesia after arriving in the postanaesthesia care unit was significantly delayed in group A (72.2±24.95 minutes) compared to that in group B (25±26.68 minutes) (p<0.05). Pain scores were significantly higher in the group B at 15min compared to group A (p<0.05), but not at the rest of the time points (p>0.05). CONCLUSIONS: Intravenous magnesium sulphate proved to be effective in lowering postoperative opioid requirement following limb amputations.

Pharmacologic and nonpharmacologic options for pain relief during labor: an expert review.

Labor pain is among the most severe types of physical pain that women may experience during their lifetime. Thus, pain relief is an essential part of medical care during childbirth. Epidural analgesia is considered to be the most efficient method of pain relief during labor. Nevertheless, patient preferences, contraindications, limited availability, and technical failure may require the use of alternative pain reliving methods during labor including systemic pharmacologic agents, and nonpharmacologic methods. Nonpharmacologic methods for pain alleviation during vaginal birth have become popular over the years, either as a complement to pharmacologic agents or at times as the principal therapy. Methods such as relaxation techniques (ie, yoga, hypnosis, and music), manual techniques (ie, massage, reflexology, and shiatsu), acupuncture, birthing ball, and transcutaneous electrical nerve stimulation are considered safe, although the evidence supporting their effectiveness for pain relief is not as robust as it is for pharmacologic agents. Systemic pharmacologic agents are mostly administered by inhalation (nitrous oxide) or through the parenteral route. These agents include opioids such as meperidine, nalbuphine, tramadol, butorphanol, morphine, and remifentanil, and non-opioid agents such as parenteral acetaminophen and nonsteroidal anti-inflammatory drugs. Systemic pharmacologic agents suggest a diverse armamentarium of medication for pain management during labor. Their efficacy in treating pain associated with labor varies, and some continue to be used even though they have not been proven effective for pain relief. In addition, the maternal and perinatal side effects differ markedly among these agents. There is a relative abundance of data regarding the effectiveness of analgesic drugs compared with epidural, but the data regarding comparisons among the different types of alternative analgesic agents are scarce, and there is no consistency regarding the drug of choice for women who do not receive epidural pain management. This review aims to present the available data regarding the effectiveness of the different methods of relieving pain during labor other than epidural. The data presented are mainly based on recent level I evidence regarding pharmacologic and nonpharmacologic methods for pain relief during labor.

Comparison between ketorolac- and fentanyl-based patient-controlled analgesia for acute kidney injury after robot-assisted radical prostatectomy: a retrospective propensity score-matched analysis.

PURPOSE: It is unclear whether ketorolac-based patient-controlled analgesia (PCA) leads to acute kidney injury (AKI) after robot-assisted radical prostatectomy (RARP) in patients susceptible to AKI. We compared the postoperative AKI incidence with ketorolac- and fentanyl-based PCA after RARP. METHODS: After medical record review, eligible patients were divided in ketorolac and fentanyl groups. We conducted propensity score matching of 3239 patients and assigned 641 matched patients to each group, and compared the AKI incidence. We investigated potential risk factors for postoperative AKI, defined according to the Kidney Disease Improving Global Outcomes criteria. We collected preoperative data (age, height, weight, body mass index, American Society of Anesthesiologists physical status, medical history, creatinine level, estimated glomerular filtration rate, and hemoglobin level) and intraoperative data (maintenance anesthetics, surgery duration, anesthesia duration, crystalloid amount, colloid use, total amount of fluid administered, estimated blood loss, norepinephrine use, phenylephrine use, and PCA type). RESULTS: The postoperative AKI incidence was significantly higher in the ketorolac than in the fentanyl group, both before (31.1% vs. 20.4%; p < 0.001) and after (31.5% vs. 22.6%; p < 0.001) matching. In the univariate analysis, ketorolac was significantly associated with postoperative AKI, both before (odds ratio [OR], 1.762; 95% confidence interval [CI], 1.475-2.105; p < 0.001) and after (OR, 1.574; 95% CI, 1.227-2.019; p < 0.001) matching. In the multivariate analysis, ketorolac-based PCA was independently associated with development of postoperative AKI in the matched groups (OR, 1.659; 95% CI, 1.283-2.147; p < 0.001). CONCLUSION: Ketorolac-based PCA may increase postoperative AKI incidence after RARP; thus, renal function should be monitored in these patients.

Regular use of low-dose of opioids after gastrointestinal surgery may lead to postoperative gastrointestinal tract dysfunction in children: a Chinese national regional health center experience sharing.

BACKGROUND: The need for pain management is increasing in pediatrics, but the side effects of overuse or abuse of analgesics can be harmful to children's health and even life-threatening in severe cases. METHODS: Patients who underwent resection of Meckel's diverticulum at the Children's Hospital of Chongqing Medical University from July 1, 2019, to July 1, 2022, were included in this study. Opioids were administered through patient-controlled analgesia (PCA). Based on the preoperative choices made by the legal guardians, patients were stratified into two groups: PCA Group (PCAG) and Non-PCA Group (NPCAG). Data pertaining to the clinical characteristics and prognoses of these patients were subsequently collected and analyzed to assess the impact of opioid administration. RESULTS: In the study, a total of 126 patients were enrolled, with 72 allocated to the Patient-Controlled Analgesia Group (PCAG) and 54 to the Non-Patient-Controlled Analgesia Group (NPCAG). When compared to the NPCAG, the PCAG exhibited a longer duration of postoperative fasting (median 72 vs. 62 h, p = 0.044) and increased utilization of laxatives (12[16.7%] vs. 2[3.7%], p = 0.022). However, the PCAG also experienced higher incidences of intestinal stasis and abnormal intestinal dilation (13[18.1%] vs. 3[5.6%], p = 0.037). No statistically significant differences were observed in pain assessments at the conclusion of the surgical procedure (0 vs. 1[1.9%], p = 0.429) or within the first 24 h postoperatively (16[22.2%] vs. 18[33.3%], p = 0.164). Additionally, NPCAG patients did not necessitate increased administration of rescue analgesics (2[2.8%] vs. 4[7.4%], p = 0.432). CONCLUSIONS: The administration of opioids did not demonstrably ameliorate postoperative pain but was associated with a heightened incidence of postoperative gastrointestinal tract dysfunction. The retrospective nature of the current research should be considered and should be clarified further.

Analgesic efficacy of continuous wound infiltration compared with continuous intravenous fentanyl after gynaecological surgery: a non-inferiority, randomised controlled trial.

OBJECTIVE: The present trial aimed to prove the non-inferiority of the analgesic efficacy of continuous wound infiltration (CWI) to that of continuous intravenous fentanyl (IV) and to compare the safety of the two methods. METHODS: This trial was a prospective, single-centre, two-arm, non-inferiority, randomised controlled trial. Patients participating in the trial were randomised to a CWI group or an IV group. The VAS (visual analogue scale), additional analgesic usage and side effects were then compared between the groups. RESULTS: In total, 61 patients were enrolled; two in CWI were excluded, leaving 59 (30 in the CWI group and 29 in the IV group) for analysis. The difference in the VAS score at 24 h (CWI group - IV group) was -3.2 (95% confidence interval [CI] -14.7 to 8.2), which was less than the non-inferiority margin of 15. The mean amount of total fentanyl use at postoperative hour 48 was 1395 (95% CI 886-1903) µg in the CWI group and 3186 (95% CI 2716-3658) µg in the IV group. The amount of other analgesics and the incidence of adverse effects did not differ significantly between the groups. CONCLUSION: CWI was non-inferior to IV in terms of its analgesic effect, and has an opioid sparing effect in open gynaecological surgery.

Epidural analgesia and emergency delivery for presumed fetal compromise: post-hoc analysis of RAVEL multicenter randomized controlled trial.

OBJECTIVE: To investigate the association between epidural analgesia (EDA) vs patient-controlled remifentanil analgesia (PCRA) and emergency delivery for presumed fetal compromise, in relation to birth-weight quintile. METHODS: This was a post-hoc per-protocol analysis of the RAVEL multicenter equivalence randomized controlled trial. Non-anomalous singleton pregnancies between 36 + 0 and 42 + 6 weeks' gestation were randomized at the time of requesting pain relief to receive EDA or PCRA. The primary outcome was emergency delivery for presumed fetal compromise. Secondary outcomes included mode of delivery and neonatal outcomes. Analysis was performed according to birth-weight quintile and was corrected for relevant confounding variables. RESULTS: Of 619 pregnant women, 336 received PCRA and 283 received EDA. Among women receiving EDA, 14.8% had an emergency delivery for presumed fetal compromise, compared with 8.3% of women who received PCRA. After adjusting for parity, women receiving EDA had higher odds of presumed fetal compromise compared to those receiving PCRA (odds ratio, 1.69 (95% CI, 1.01-2.83)). A statistically significant linear-by-linear association was observed between presumed fetal compromise and birth-weight quintile (P = 0.003). The incidence of emergency delivery for presumed fetal compromise was highest in women receiving EDA and delivering a neonate with a birth weight in the lowest quintile. CONCLUSIONS: Intrapartum EDA is associated with a higher rate of emergency delivery for presumed fetal compromise compared to treatment with PCRA. Birth-weight quintile is a strong predictor of this outcome, independent of pain management method. © 2023 The Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.

Comparison of Opioid-Based Patient-Controlled Analgesia with Physician-Directed Analgesia in Acute Pancreatitis: A Retrospective Cohort Study.

BACKGROUND: Patient-controlled analgesia (PCA) is commonly used for acute postoperative pain management. Clinicians may also use PCA in the management of acute pancreatitis (AP); however, there is limited data on its impact on patient outcomes. We aimed to characterize a cohort of patients receiving PCA therapy for pain management in AP compared to those patients receiving standard physician-directed delivery of analgesia. METHODS: We conducted a retrospective cohort study of adult patients admitted with AP at a tertiary care center from 2008 to 2018. Exclusion criteria included patients with chronic opioid use, chronic pancreatitis and pancreatic cancer. Primary outcomes include length of stay (LOS) and time to enteral nutrition. Secondary outcomes include proportion of patients discharged with opioid and complications. Multivariate regression analysis and t-test were used for analysis. RESULTS: Among 656 AP patients who met the criteria, patients receiving PCA (n = 62) and standard delivery (n = 594) were similar in admission pain score, Charlson Comorbidity Index, and pancreatitis severity. There were significantly greater proportion of women, Caucasians and nonalcoholics who received PCA therapy (p < 0.01) than standard delivery. Multivariate regression analysis revealed that patients in the PCA group have a longer LOS (7.17 vs. 5.43 days, p < 0.007, OR 1.03; 95% CI 1.01-1.07), longer time to enteral nutrition (3.84 days vs. 2.56 days, p = 0.012, OR 1.11; 95% CI 1.02-1.20), and higher likelihood of being discharged with opioids (OR 1.94; 95% CI 1.07-3.63, p = 0.03). CONCLUSION: The use of PCA in AP may be associated with poorer outcomes including longer LOS, time to enteral intake and a higher likelihood of being discharged with opioids.

Incidence change of postoperative delirium after implementation of processed electroencephalography monitoring during surgery: a retrospective evaluation study.

BACKGROUND: Postoperative delirium (POD) is a common complication in the elderly, which is associated with poor outcomes after surgery. Recognized as predisposing factors for POD, anesthetic exposure and burst suppression during general anesthesia can be minimized with intraoperative processed electroencephalography (pEEG) monitoring. In this study, we aimed to evaluate whether implementation of intraoperative pEEG-guided anesthesia is associated with incidence change of POD. METHODS: In this retrospective evaluation study, we analyzed intravenous patient-controlled analgesia (IVPCA) dataset from 2013 to 2017. There were 7425 patients using IVPCA after a noncardiac procedure under general anesthesia. Patients incapable of operating the device independently, such as cognitive dysfunction or prolonged sedation, were declined and not involved in the dataset. After excluding patients who opted out within three days (N = 110) and those with missing data (N = 24), 7318 eligible participants were enrolled. Intraoperative pEEG has been implemented since July 2015. Participants having surgery after this time point had intraoperative pEEG applied before induction until full recovery. All related staff had been trained in the application of pEEG-guided anesthesia and the assessment of POD. Patients were screened twice daily for POD within 3 days after surgery by staff in the pain management team. In the first part of this study, we compared the incidence of POD and its trend from 2013 January-2015 July with 2015 July-2017 December. In the second part, we estimated odds ratios of risk factors for POD using multivariable logistic regression in case-control setting. RESULTS: The incidence of POD decreased from 1.18 to 0.41% after the administration of intraoperative pEEG. For the age group ≧ 75 years, POD incidence decreased from 5.1 to 1.56%. Further analysis showed that patients with pEEG-guided anesthesia were associated with a lower odd of POD (aOR 0.33; 95% CI 0.18-0.60) than those without after adjusting for other covariates. CONCLUSIONS: Implementation of intraoperative pEEG was associated with a lower incidence of POD within 3 days after surgery, particularly in the elderly. Intraoperative pEEG might be reasonably considered as part of the strategy to prevent POD in the elder population. TRIAL REGISTRATION: Not applicable.

Comparison of different delivery modalities of epidural analgesia and intravenous analgesia in labour: a systematic review and network meta-analysis.

PURPOSE: In labour, neuraxial analgesia is the standard in the provision of pain relief. However, the optimal mode of delivering epidural solution has not been determined, and some parturients may need an alternative to epidural analgesia. We sought to conduct a systematic review and network meta-analysis to compare continuous epidural infusion (CEI), programmed intermittent epidural bolus (PIEB), computer-integrated CEI, computer-integrated PIEB, patient-controlled epidural bolus (PCEA), fentanyl patient-controlled analgesia (PCA), and remifentanil PCA, either alone or in combination. METHODS: We searched CENTRAL, CINAHL, Ovid Embase, Ovid Medline, and Web of Science for randomized controlled trials that included nulliparous and/or multiparous parturients in spontaneous or induced labour. The maintenance epidural solution had to include a low concentration local anesthetic and an opioid. Specific subgroups in the obstetric population such as preeclampsia were excluded. Network meta-analysis was performed with a frequentist method, and continuous and dichotomous outcomes are presented as mean differences and odds ratios, respectively, with 95% confidence intervals. RESULTS: Overall, 73 trials were included. For the first coprimary outcome, the need for rescue analgesia, CEI was inferior to PIEB and PIEB + PCEA was superior to PCEA alone, with a low certainty of evidence given the presence of serious limitations and imprecision. The second coprimary outcome, the maternal satisfaction, was improved by PIEB + PCEA compared with CEI + PCEA and PCEA alone, with a low quality of evidence in view of the presence of serious limitations and imprecision. Fentanyl PCA increased the requirement for rescue analgesia and decreased maternal satisfaction relative to many methods of delivering epidural solution. In terms of secondary outcomes, PIEB increased analgesic efficacy compared with CEI, and PCEA reduced local anesthetic consumption at the expense of inferior analgesia relative to CEI and PIEB. PIEB + PCEA was superior to CEI + PCEA in regard to the pain score at 2 h and 4 h, consumption of local anesthetic, incidence of lower lower limb motor blockade and the rate of spontaneous vaginal delivery. Fentanyl and remifentanil PCA did not provide the same level of analgesia as all epidural methods, resulted in increasing analgesic ineffectiveness with time spent in labour, and predisposed to a higher incidence of side effects such as nausea and/or vomiting and sedation. Remifentanil PCA was superior to fentanyl PCA for analgesia at an early time point, and it increased the incidence of oxygen desaturation relative to other strategies of delivering epidural solution. CONCLUSIONS: Opioid PCA did not provide the same level of analgesia as epidural methods with a higher incidence of side effects. We interpret the findings of our systematic review and network meta-analysis as suggesting PIEB + PCEA to be the optimal delivery mode of epidural solution. Nevertheless, the potential differing importance of the various maternal, fetal, and neonatal outcomes in determining which is optimal has not, to our knowledge, been elucidated yet. STUDY REGISTRATION: PROSPERO (CRD42021254978); registered 27 May 2021.

RéSUMé: OBJECTIF: Pendant le travail obstétrical, l'analgésie neuraxiale constitue la norme de soins pour soulager la douleur. Néanmoins, le mode optimal d'administration de la solution péridurale n'a pas été déterminé et certaines parturientes pourraient avoir besoin d'une alternative à l'analgésie péridurale. Nous avons cherché à réaliser une revue systématique et une méta-analyse en réseau pour comparer l'analgésie péridurale par perfusion continue (APPC), l'administration programmée de bolus périduraux (PIEB), l'APPC intégrée par ordinateur, l'analgésie péridurale contrôlée par la patiente (l'APCP), l'analgésie contrôlée par la patiente (ACP) de fentanyl et l'ACP de rémifentanil, soit seules ou en combinaison. MéTHODE: Nous avons effectué des recherches dans les bases de données CENTRAL, CINAHL, Ovid Embase, Ovid Medline et Web of Science pour en tirer les études randomisées contrôlées incluant des parturientes nullipares et/ou multipares en travail spontané ou induit. La solution péridurale de maintien devait inclure un anesthésique local à faible concentration et un opioïde. Des sous-groupes spécifiques dans la population obstétricale, comme par exemple les parturientes atteintes de prééclampsie, ont été exclus. Une méta-analyse en réseau a été réalisée à l'aide d'une méthode fréquentiste, et les résultats continus et dichotomiques sont présentés sous forme de différences moyennes et de rapports de cotes, respectivement, avec des intervalles de confiance à 95 %. RéSULTATS: Au total, 73 études ont été incluses. Concernant le premier critère d'évaluation coprincipal, soit le besoin d'analgésie de secours, l'APPC était inférieure à la PIEB, et la PIEB + APCP était supérieure à l'APCP seule, avec un faible niveau de fiabilité des données probantes compte tenu de la présence de limitations et d'imprécisions importantes. Le deuxième critère d'évaluation coprincipal, soit la satisfaction maternelle, a été amélioré avec la PIEB + APCP comparativement à l'APPC + APCP et à l'APCP seule, avec une faible qualité de données probantes compte tenu de la présence de limitations et d'imprécisions importantes. L'ACP à base de fentanyl a augmenté le besoin d'analgésie de secours et diminué la satisfaction maternelle par rapport à de nombreuses méthodes d'administration de la solution péridurale. En termes de critères d'évaluation secondaires, la PIEB a amélioré l'efficacité analgésique par rapport à l'APPC, et l'APCP a diminué la consommation d'anesthésiques locaux au détriment d'une analgésie inférieure par rapport à l'APPC et à la PIEB. La PIEB + APCP était supérieure à l'APPC + APCP en ce qui a trait aux scores de douleur à 2 h et 4 h, à la consommation d'anesthésiques locaux, à l'incidence de bloc moteur des membres inférieurs et au taux d'accouchement vaginal spontané. Les ACP de fentanyl et de rémifentanil n'ont pas fourni le même niveau d'analgésie que toutes les méthodes péridurales et ont entraîné une augmentation de l'inefficacité analgésique avec le temps passé en travail actif, en plus de prédisposer les parturientes à une incidence plus élevée d'effets secondaires tels que les nausées et/ou vomissements et la sédation. L'ACP de rémifentanil était supérieure à l'ACP de fentanyl en début d'analgésie mais a augmenté l'incidence de désaturation en oxygène par rapport aux stratégies de livraison de la solution péridurale. CONCLUSION: L'ACP à base d'opioïdes n'a pas fourni le même niveau d'analgésie que les méthodes péridurales, avec une incidence plus élevée d'effets secondaires. Nous interprétons les résultats de notre revue systématique et de notre méta-analyse en réseau comme suggérant que la PIEB + APCP constitue le mode d'administration optimal de la solution péridurale. Néanmoins, la différence potentielle en importance des divers devenirs maternels, fœtaux et néonataux pour déterminer la modalité optimale n'a pas encore été élucidée, à notre connaissance. ENREGISTREMENT DE L'éTUDE: PROSPERO (CRD42021254978); enregistrée le 27 mai 2021.

Analgesia quality index improves the quality of postoperative pain management: a retrospective observational study of 14,747 patients between 2014 and 2021.

BACKGROUND: The application of artificial intelligence patient-controlled analgesia (AI-PCA) facilitates the remote monitoring of analgesia management, the implementation of mobile ward rounds, and the automatic recording of all types of key data in the clinical setting. However, it cannot quantify the quality of postoperative analgesia management. This study aimed to establish an index (analgesia quality index (AQI)) to re-monitor and re-evaluate the system, equipment, medical staff and degree of patient matching to quantify the quality of postoperative pain management through machine learning. METHODS: Utilizing the wireless analgesic pump system database of the Cancer Hospital Affiliated with Nantong University, this retrospective observational study recruited consecutive patients who underwent postoperative analgesia using AI-PCA from June 1, 2014, to August 31, 2021. All patients were grouped according to whether or not the AQI was used to guide the management of postoperative analgesia: The control group did not receive the AQI guidance for postoperative analgesia and the experimental group received the AQI guidance for postoperative analgesia. The primary outcome was the incidence of moderate-to-severe pain (numeric rating scale (NRS) score ≥ 4) and the second outcome was the incidence of total adverse reactions. Furthermore, indicators of AQI were recorded. RESULTS: A total of 14,747 patients were included in this current study. The incidence of moderate-to-severe pain was 26.3% in the control group and 21.7% in the experimental group. The estimated ratio difference was 4.6% between the two groups (95% confidence interval [CI], 3.2% to 6.0%; P < 0.001). There were significant differences between groups. Otherwise, the differences in the incidence of total adverse reactions between the two groups were nonsignificant. CONCLUSIONS: Compared to the traditional management of postoperative analgesia, application of the AQI decreased the incidence of moderate-to-severe pain. Clinical application of the AQI contributes to improving the quality of postoperative analgesia management and may provide guidance for optimum pain management in the postoperative setting.

The effect of body mass index on thoracic paravertebral block analgesia after video-assisted thoracoscopic surgery; a prospective interventional study.

BACKGROUND: To investigate the effects of body mass index (BMI) on intensity postoperative pain in patients who underwent thoracic paravertebral block (TPVB) for postoperative analgesia after video-assissted thoracoscopic surgery (VATS). METHODS: Patients aged 18-80 years, ASA I-III, and BMI 18-40 kg/m2 who underwent elective VATS were included in the study. The patients were divided into 3 groups according to their BMI levels. TPVB was performed under ultrasound-guidance at the fifth thoracic vertebrae, and 30 ml of 0.25% bupivacaine was injected. The patient-controlled analgesia (PCA) was performed by using morphine and multimodal analgesia was performed. As a rescue analgesic agent, 0.5 mg/kg tramadol was given to patients intravenously when a score of visual analog scale (VAS) at rest was ≥ 4. The primary outcome was determined as VAS scores at rest and cough. Secondary outcomes were determined as postoperative morphine consumption, additional analgesic requirement, and side effects. RESULTS: The post-hoc test revealed that the VAS resting scores at the 4th hour (p: 0.007), 12th hour (p: 0.014), and 48th hour (p: 0.002) were statistically significantly lower in Group I compared to Group II. Additionally, VAS resting scores were also statistically significantly lower in Group I compared to Group III at all time points (p < 0.05). Similarly, the post-hoc test indicated that the VAS coughing scores at the 4th hour (p: 0.023), 12th hour (p: 0.011), and 48th hour (p: 0.019) were statistically significantly lower in Group I compared to Group II. Moreover, VAS coughing scores were statistically significantly lower in Group I compared to Group III at all time points (p < 0.001). Furthermore, there were statistically significant differences in terms of additional analgesic use between the groups (p: 0.001). Additionally, there was a statistically significant difference in terms of morphine consumption via PCA and morphine milligram equivalent consumption between the groups (p < 0.001). CONCLUSIONS: Higher postoperative VAS scores with TPVB applied in obese patients and the consequent increase in additional analgesics and complications require more specific postoperative management in this patient group.

Intravenous lidocaine simultaneously infused with sufentanil to accelerate gastrointestinal function recovery in patients after thoracolumbar surgery: a prospective, randomized, double-blind controlled study.

PURPOSE: Postoperative gastrointestinal dysfunction is one of the common complications of surgery, especially after surgery for a thoracolumbar spinal fracture. Intravenous lidocaine is a potential method to improve postoperative gastrointestinal function in surgical patients, reduce opioid use and shorten hospital stays. The purpose of this study is to explore the effect of intravenous lidocaine on the recovery of gastrointestinal function in patients after thoracolumbar surgery. METHODS: In this study, 48 eligible patients undergoing elective thoracolumbar spine fractures resection and internal fixation surgery were enrolled to receive intravenous injections of lidocaine in different concentrations during the perioperative period. Patients were randomly divided into three groups: control group (group A), low concentration of lidocaine group (group B) and high concentration of lidocaine group (group C), 16 patients in each group. First postoperative exhaust time, numbers of bowel sound at preoperative and postoperative 3, 6, 12, 24 h, pain scores at postoperative 0, 3, 6, 12, 24, 48 h, total sufentanil use in PACU and perioperative periods, postoperative hospital stay and analgesic remedy within postoperative 48 h were recorded and compared. The primary endpoints include: the time of first flatus passage after the operation, the number of bowel sounds per minute counted with stethoscope at 30 min before anesthesia induction and at 3, 6, 12 and 24 h postoperative. The secondary endpoints included: the pain scores at PACU (after entering into PACU), 3, 6, 12, 24 and 48 h postoperative, the amount of sufentanil administrated by intravenous push during operation and the numbers of patients needed rescuing sufentanil in PACU, and the numbers of patients needed administration of gastric motility drugs or non-steroidal analgesics at ward within 48 h postoperation, length of hospital stay (from the first day after surgery to discharge from hospital) and the incidence of adverse reactions. RESULTS: Compared with group A, the first postoperative exhaust time in group B and C occurred much earlier (23.3 ± 11.0 h vs. 16.0 ± 6.6 h, 16.6 ± 5.1 h, P < 0.05). Compared with preoperation, the numbers of bowel sound significantly increased at 24 h postoperatively in group B, while group B at 6 h and group C at 6 and 24 h postoperatively had significantly more active bowel sounds compared to group A (P < 0.05). There were no remarkable differences in VAS scores within 12 h postoperatively among three groups, and however, significantly lower VAS scores were found at 12, 24 and 48 h postoperatively in group C when comparing to Group A (p < 0.05). There was no statistical significance in the incidence of postoperative flatulence and nausea and vomiting, the number of patients needed rescuing sufentanil in PACU, the length of postoperative hospital stay and the number of patients requiring non-steroidal analgesics at ward within 48 h postoperation. CONCLUSIONS: Intravenous lidocaine infusion together with patient-controlled analgesia of sufentanil expedited the early recovery of gastrointestinal function and improved analgesic quality of sefentanyl in patients undergoing thoracolumbar surgeries.