Epidural Opioids Research Articles

A COMPARISON OF EFFICACY OF EPIDURAL BUTORPHANOL AND FENTANYL FOR POST-OPERATIVE PAIN ANALGESIA IN LOWER ABDOMINAL AND LOWER LIMB SURGERIES UNDER EPIDURAL ANESTHESIA: A PROSPECTIVE RANDOMIZED DOUBLE-BLINDED STUDY

Objective: Lower doses of epidural opioids can achieve post-operative analgesia for infraumbilical surgeries. A study was conducted to compare the efficacy of epidural butorphanol and fentanyl for post-operative analgesia, onset, duration, and side effects in infraumbilical surgeries. Methods: A study was conducted on 80 adult patients, both male and female, aged between 20 and 60 years, having American Society of Anesthesiologists Physical Status I and II, who were undergoing lower abdominal and lower limb surgeries under epidural anesthesia. The patients were randomly divided into two groups: Group A and Group B. Both groups were given injections of bupivacaine 20 mL of 0.5% epidurally. In the post-operative period, when the patient’s Visual Analog Scale score was more than 4, Group A was administered butorphanol 2 mg followed by top-up doses of 0.5 mg, and Group B was administered fentanyl 50 μg followed by top-up doses of 15 μg, which were diluted to 10 mL in normal saline. Along with cardiorespiratory parameters, the study also noted onset, duration, quality of analgesia, and the number of epidural doses in 24 h. The statistical analysis was done using Student’s t-test and two-tailed Fisher’s exact test or Chi-square (χ2) test, and a significant value of p<0.05 was considered. Results: In comparing the post-operative analgesia between both groups, it was found that Group B had significant early onset of analgesia (2.600±0.4557 vs. 6.087±0.7501), shorter duration of analgesia (200.08±26.257 vs. 366.25±42.829), a higher number of epidural doses administered (3.75±1.171 vs. 2.98±0.733), lower quality of analgesia (2.55±0.504 vs. 3.18±0.636), and a greater incidence of vomiting (30.0% vs. 2.5%) when compared to group A. Conclusion: Superior analgesia with higher sedation can be achieved through epidural butorphanol, while fentanyl has a quicker onset of analgesia but a higher tendency for vomiting. Our conclusion is that both options, fentanyl and epidural butorphanol, are safe and effective for achieving post-operative pain relief.

Epidural methadone and morphine pharmacokinetics and clinical effects in healthy volunteers: A randomized, crossover-design trial.

Epidural opioids can provide effective analgesia for acute postoperative pain. Due to its unique physicochemical properties and long systemic elimination half-life, epidural methadone may provide lasting analgesia with minimal adverse effects; however, human studies are lacking. The aim of the study was to test the hypothesis that epidural methadone would exhibit greater segmental analgesia (analgesia at the dermatome of injection vs. distant dermatomes) than epidural morphine. In a prospective, randomized, double-blinded, crossover study, thirteen healthy volunteers received a 4-mg epidural bolus of methadone or morphine at L3-L4 and underwent repeated assessment of dermatomal heat pain tolerance and pressure pain threshold at lumbar (L3) and trigeminal (V2) dermatomes, pupil diameter, respiratory parameters and venous opioid concentration for 24 h. The primary outcome was selective (lumbar vs. trigeminal) segmental analgesia for heat pain, as a marker of a spinal analgesic mechanism. The degree of segmental analgesia to heat pain tolerance was not different between morphine and methadone (P =.09), although morphine (P =.0009) but not methadone (P =.81) produced significant analgesia to heat pain at the lumbar vs. trigeminal dermatome over 0-12 h. Morphine overall provided longer lasting analgesia to heat pain vs. methadone (24 vs. 2 h, respectively). Morphine elicited greater systemic effects, including miosis (P =.009) and opioid-related adverse effects (P =.002). These results suggest that, with equal epidural doses, both methadone and morphine produced analgesia and methadone did not produce greater segmental effects than morphine. Epidural methadone provided a more favourable adverse effect profile.

Methods of prolonging the effect of caudal block in children.

Caudal epidural blockade is one of the most frequently administered regional anesthesia techniques in children. It is a supplement during general anesthesia and for providing postoperative analgesia in pediatrics for sub-umbilical surgeries, especially for genitourinary surgeries. However, the duration of the analgesic effect is occasionally unsatisfactory. In this review, we discuss the main advantages and disadvantages of different techniques to prolong postoperative analgesia for single-injection caudal blockade in children. A literature search of the keywords "caudal", "analgesia", "pediatric", and "children" was performed using PubMed and Web of Science databases. We highlight that analgesic quality correlates substantially with the local anesthetic's type, dose, the timing relationship between caudal block and surgery, caudal catheterization, and administration of epidural opioids or other adjuvant drugs.

The 50% effective dose of hydromorphone and morphine for epidural analgesia in the hemorrhoidectomy: a double-blind, sequential dose-finding study

BackgroundAlthough previous studies have showed that epidural morphine can be used as a complement to local anesthetics for analgesia after postcesarean delivery under spinal anesthesia, there is little known about the analgesic dosage of epidural morphine and hydromorphone for hemorrhoidectomy. Therefore, we conducted this study to examine the potency ratio of hydromorphone to epidural morphine as well as effective analgesic dose for 50% patients (ED50) undergoing elective hemorrhoidectomy.Methods80 patients under elective hemorrhoidectomy with combined spinal and epidural anesthesia(CSEA) in department of anesthesia, Dongguan Tungwah hospital. To assess the ED50, patients were treated with epidural morphine or epidural hydromorphone randomly using a biased coin method-determined dose with a sequential allocation procedure. Following surgery, standardized multimodal analgesia was administered to all patients. A pain response score of ≤ 3 (on a scale of 0–10) was determined to be the effective dose after 24 h following CSEA. The ED50 in both groups were determined using the probit regression and isotonic regression method. We also measured pain intensity by patient interview using a 10 point verbal numeric rating scale prospectively at 6, 12 and 24 h after CSEA, and adverse effects were also noted.ResultsThe ED50 was 0.350 mg (95% CI, 0.259–0.376 mg) in hydromorphone group and 1.129 mg (95% CI, 0.903–1.187 mg) in morphine group, respectively, estimated by isotonic regression method. Regression analysis with the probit, the ED50 of epidural hydromorphone was 0.366 mg (95% CI, 0.276–0.388 mg) and epidural morphine was 1.138 mg (95% CI, 0.910–1.201 mg). Exploratory findings showed that there was no difference between the most frequent dosages of epidural hydromorphone or epidural morphine in the occurrence of nausea, vomiting and pruritus. When administered with epidural opioids at ED50 doses or higher, 97.5% (39/40) of epidural morphine patients and 97.5% (39/40) epidural hydromorphone of patients were satisfied with their analgesia.ConclusionEffective hemorrhoidectomy analgesia requires a 3:1 ratio of epidural morphine to epidural hydromorphone. Both drugs provide excellent patient satisfaction.

Efficacy of epidural analgesia for intractable cancer pain: Asystematic review.

Epidural analgesia is a common technique for managing perioperative and obstetric pain. Patients with cancer who cannot tolerate opioids or not responding to conventional treatment may benefit from epidural analgesia. Therefore, this systematic review aimed to analyze the efficacy and safety of epidural analgesia in patients with intractable cancer pain. We searched PubMed, Embase, and the Cochrane Central Register of Controlled Trials to identify studies on patients with cancer who received epidural analgesia. We assessed the quality of all included studies using the risk-of-bias tool or Newcastle-Ottawa scale. The primary outcome was pain relief after epidural analgesia, and the secondary outcome was quality of life, analgesic consumption, and adverse events. The studies were grouped based on the medications used for epidural analgesia. A descriptive synthesis was performed following the Synthesis Without Meta-analysis reporting guideline. Our systematic review included nine randomized controlled trials (n = 340) and 15 observational studies (n = 926). Two randomized controlled trials suggested that epidural opioids were not superior to systemic opioids in relieving pain. Epidural opioids combined with local anesthetics or adjuvants, including calcitonin, clonidine, ketamine, neostigmine, methadone, and dexamethasone, offered better analgesic effects. No significant difference in pain relief between an intermittent bolus and a continuous infusion of epidural morphine was observed. Epidural opioids had more analgesic effects on nociceptive pain than neuropathic pain. The methods used to evaluate the quality of life and the corresponding results were heterogeneous among studies. Six observational studies demonstrated that some patients could have decreased opioid consumption after epidural analgesia. Adverse events, including complications and drug-related side effects, were reported in 23 studies. Five serious complications, such as epidural abscess and hematoma, required surgical management. The heterogeneity and methodological limitations of the studies hindered meta-analysis and evidence-level determination. Coadministration of epidural opioids, local anesthetics, and adjuvants may provide better pain relief for intractable cancer pain. However, we must assess the patients to ensure that the benefits outweigh the risks before epidural analgesia. Therefore, further high-quality studies are required.

Dexmedetomidine and Fentanyl as Adjuvant to Bupivacaine for Epidural Analgesia in Gastrectomy Surgery

Background: Opioids as epidural adjunct to local anaesthetics have been in use so long and the synergism between epidural local anaesthetic agents and opioids are well established. Dexmedetomidine (α-2 agonist) is being increasingly used for similar purpose but evidence for the combination of local anaesthetic agents with dexmedetomidine in epidural analgesia is limited. Gastic cancer is increasing day by day in our country and removal of tumor by gastrectomy surgery is choice of treatment. The present study was conducted to compare the analgesic, hemodynamic, sedative effects of epidurally administered dexmedetomidine and fentanyl when combined with bupivacaine in a patient undergoing gastrectomy surgery along with general anaesthesia.Methods: This randomized controlled trial study was carried out in the Department of Anaesthesia, Analgesia and Intensive Care Medicine, BSMMU, Dhaka. The study was been conducted 12 month after obtaining approval from the institutional Review Board and informed written consent from the patient. About 40 patients aged between 40 and 70 years, posted for gastrectomy surgery were included in this study. The patients were randomly allocated into two equal groups. Group A received general anaesthesia along with epidural fentanyl and bupivacaine. Group B received general anaesthesia along with epidural dexmedetomidine andbupivacaine. During surgery, hemodynamic status of the patients had been carefully recorded. Following surgery, pain intensity was recorded using a visual analog scale (VAS) for 6 hours and observed for the time of first rescue analgesic requirement, post-operative sedation score by Ramsay sedation score, and surgeons satisfaction by likert scale. A statistical analysis was carriedout by using the Statistical Package for Social Sciences version 23.0 for Windows. Chi-Square test used to analyze the categorical variables and student t-test used for continuous variables. P value <0.05 was considered as statistically significant.Results: Age, height, and weight were almost identical between two groups. Duration of surgery and anaesthesia were almost similar between two groups. Systolic blood pressures, diastolic blood pressure, MAP were almost similar between two groups and were statically not significant (p>0.05). Mean heart rate of group B was significantly lower (p<0.05) than that of group A. Post-operative visual analog scale was reduced significantly (p<0.05) in group B than group A. The time of first analgesic requirement was significantly higher (p<0.05) in group B. The mean sedation score was also significantly higher (p < 0.05) in group B than group A.Conclusion: Dexmedetomidine seems to be a better alternative to fentanyl as an epidural adjuvant to local anaesthetics as it decreases pain intensity during post-operative period, delayed time of first analgesic supplementation, provides better sedation level without harmful derangement on hemodynamics.

Automated mandatory bolus versus basal infusion for maintenance of epidural analgesia in labour.

Automated mandatory bolus versus basal infusion for maintenance of epidural analgesia in labour.

STING controls opioid-induced itch and chronic itch via spinal tank-binding kinase 1-dependent type I interferon response in mice

BackgroundPatients receiving epidural or intrathecal opioids administration for neuraxial analgesia frequently suffer from an irritating itch. STING (stimulator of interferon genes), an innate immune modulator, is strongly implicated in pain pathogenesis via neuron-immune modulation. Given that pain and itch share some common neurocircuits, we evaluate the therapeutic potential of STING agonists in opioid-induced itch and chronic itch.MethodsOpioids (morphine, fentanyl and sufentanil) were intrathecally injected to induce acute itch. Chronic itch was induced by dry skin and contact dermatitis. Opioids analgesic effect, itch-induced scratching behavior, spinal expression of STING, phosphorylation of TBK1 (tank-binding kinase 1), IRF3 (interferon regulatory factor-3) and ERK (extracellular signal-regulated kinase), as well as production of IFN-α and IFN-β were examined. STING agonists (DMXAA and ADU-S100), TBK1 inhibitor, recombinant IFN-α and IFN-β elucidated the mechanism and treatment of itch. Whole-brain functional connectivity was evaluated using resting-state fMRI.ResultsWe report the primary expression of STING protein by the spinal dorsal horn neurons. Intraperitoneal injection of DMXAA dose-dependently reduces morphine-induced scratch bouts, without impairing morphine antinociception. Simultaneously, DMXAA alleviates fentanyl- and sufentanil-induced itching-like behavior, and chronic scratching behavior caused by dry skin and contact dermatitis. Furthermore, DMXAA drastically increases spinal phosphorylation of TBK1 and IRF3 following morphine exposure, dry skin and contact dermatitis. DMXAA-induced anti-pruritus effects and spinal productions of IFN-α and IFN-β are compensated by intrathecal delivery of the TBK1 inhibitor. Also, ADU-S100, recombinant IFN-α and IFN-β exhibits remarkable attenuation in scratching behaviors after morphine injection and dermatitis. Recombinant IFN-α inhibits morphine-induced spinal phosphorylation of ERK. Finally, DMXAA prevents dermatitis-induced the increase of cerebral functional connectivity between regions of interests such as primary somatosensory cortex, piriform cortex, retrosplenial cortex, colliculus and ventral thalamus.ConclusionsSTING activation confers protection against opioid-induced itch and chronic itch through spinal up-regulation of TBK1-IRF3-type I interferon cascades in mice, suggesting that STING agonists are promising candidates in translational development for pruritus relief.

Adding Ketamine to Epidural Morphine Does Not Prolong Postoperative Analgesia After Lumbar Laminectomy or Discectomy.

Epidural opioids provide effective postoperative analgesia after lumbar spine surgery. Ketamine has been shown to reduce opioid-induced central sensitization and hyperalgesia. We hypothesized that adding ketamine to epidural opioids would prolong the duration of analgesia and enhance analgesic efficacy after lumbar spine surgery. American Society of Anesthesiologists physical status class I to II patients aged between 18 and 70 years with normal renal function undergoing lumbar laminectomy were recruited into this single-center randomized trial. Patients were randomized to receive either single-dose epidural morphine (group A) or epidural morphine and ketamine (group B) for postoperative analgesia. The primary objective was to compare the duration of analgesia as measured by time to the first postoperative analgesic request. Secondary objectives were the comparison of pain scores at rest and movement, systemic hemodynamics, and the incidence of side effects during the first 24 hours after surgery. Fifty patients were recruited (25 in each group), of which data from 48 were available for analysis. The mean±SD duration of analgesia was 20±6 and 23±3 hours in group A and group B, respectively ( P =0.07). There were 12/24 (50%) patients in group A and 17/24 (71%) patients in group B who did not receive rescue analgesia during the first 24-hour postoperative period ( P =0.07). Pain scores at rest and movement, systemic hemodynamics, and postoperative complications were comparable between the groups. The addition of ketamine to epidural morphine did not prolong the duration of analgesia after lumbar laminectomy.

A Comparative Study of Epidural Butorphanol and Fentanyl as Adjuvants with 0.5% Bupivacaine for Postoperative analgesia in Lower Abdominal Surgeries

The pain is considered as sixth vital sign. Achieving adequate peri-operative and post -operative analgesia is of paramount importance to the anesthesiologist. This can be done by multiple approaches. One such technique is use of Epidural opioids. This study evaluates the analgesic efficacy of epidural fentanyl and butorphanol in lower abdominal surgeries for post -operative analgesia. Aims: To compare the degree of post-operative analgesia using butorphanol and fentanyl administered by epidural route. Settings and Design: Study setting: Tertiary care Hospital Study Design: A Prospective Double Blinded Randomised Clinical Study Methods and Material: A total of 60 Patients posted for elective lower abdominal surgeries were randomly selected for the study. The patients aged 20-60 years of ASA grade one and two posted for elective lower abdominal surgery were selected for the study. Drugs used were explained to the patients and also educated about Verbal numerical scale for assessment of pain. Patients were divided into two groups: Group A: receives Butorphanol 1mg mixed with 15 ml Bupivacaine 0.5%diluted upto 20 ml. Group B: receives Fentanyl 100 microgram mixed with 15 ml Bupivacaine 0.5% diluted upto 20 ml. Statistical analysis used: Statistical data was analysed using • Chi-square test • Student t-test (Paired and unpaired t-test) • A P value of < 0.05 is significant and >0.05 is not significant Results: The demographic variables were comparable in both groups. Both inj. Butorphanol 1 mg and Inj. Fentanyl 100 mcg given epidurally with Inj. Bupivacaine 0.5% as a single shot provided excellent operative conditions and satisfactory post-operative analgesia in both the groups. However, the duration of post-operative analgesia was much longer in the butorphanol group than Fentanyl group and was statistically significant. No serious side effects were noted in both groups. The method is economical, safe, convenient and acceptable and also poly pharmacy is avoided. Conclusions: Both fentanyl and butorphanol are safe and effective as epidural agents for postoperative analgesia with little side effects.

Transversus Abdominis Plane Block Versus Local Anesthetic Wound Infiltration for Postoperative Analgesia in Adult Patients Undergoing Hernia Repair in Daycare Procedure: A Randomized Control Trial.

Introduction: Various modalities are now being used to manage postoperative pain, such as regional nerve blocks techniques, continuous epidural analgesia, patient-controlled analgesia, opioids, and systemic non-steroidal anti-inflammatory drugs. This study compared the mean postoperative pain score between ultrasound-guided transversus abdominis plane (TAP) block and a local anesthetic wound infiltration at the surgical incision site.Methodology: A prospective, comparative, randomized controlled trial (RCT) was carried out from February 2021 to September 2021. The study was conducted in the anesthesia department of Dow University of Health Sciences, Karachi, Pakistan. Patients aged 18-80 years presenting with elective surgery of (both direct and indirect) inguinal hernia repair were enrolled in the study. Participants were randomly assigned into one of the two groups that are local anesthetic wound infiltration (Group A) and TAP block (Group B). The mean pain score was assessed using a visual analog scale and compared between the two groups.Results: The study included 168 patients grouped in two different groups. The mean age in Group A was 43.87 (+17.21), and Group B was 47.01 (±15.37). Mean pain scores in groups A and B were 6.36±1.94 vs 4.51 ± 1.99 (p-value=0.001). The pain rescue medications were given to 57.14% of patients in Group A and 34.52% of patients in Group B, and it was significantly different in the two groups (p-value=0.003). It was found that patients in Group A reported more severe pain (41.67%) than patients in Group B (10.71%).Conclusion: When compared to local anesthetic wound infiltration, ultrasound-guided TAP block had better analgesic activity compared to local anesthetic wound infiltration.

A comparison of high thoracic epidural anaesthesia versus conventional intravenous opioids in pediatric patients undergoing corrective open heart surgery for ventricular septal defect

Background: We compared high thoracic epidural anaesthesia with a combination of morphine and bupivacaine versus IV fentanyl as an alternative for perioperative pain management.Methods: Group-E: Injection Morphine 75-100 mcg/kg and Injection 0.25 % Bupivacaine 0.5 ml/kg was given via epidural catheter at insertion, Injection 0.25% Bupivacaine 0.5 ml/kg just before skin incision, and continuous infusion of Injection 0.125% Bupivacaine at 0.2 ml/kg/hr intra-operatively. Post-operative 0.1 ml/kg/hr infusion. Group F- intravenous fentanyl 2-3 mcg/Kg IV bolus given just before skin incision, followed by 1-2 mcg/Kg/hr IV fentanyl started after weaning from cardiopulmonary bypass.Results: The mean ScvO2 was comparable between the two groups during induction period but became higher in group E during bypass and post bypass period intraoperatively, and the difference in rise in ScvO2 is statistically significant with a p<0.05. The mean rSo2- C was comparable between the two groups in the first postoperative hour but group F shows higher rSo2-C postoperatively which was statistically significant. The postoperative pain was significantly lower in group E in the postoperative period (except for 4,5,6 and 40 and 48th hour).Conclusions: HTEA to paediatric patients prior to sternotomy for cardiac surgeries resulted in a much better control of haemodynamic parameters. Produces better central venous and regional tissue oxygenation during bypass and post bypass intraoperatively as compared to the patients that received only intravenous fentanyl. There was lower amount of postoperative bleeding in the HTEA group with significant reduction in requirement of post-operative ventilation and time to extubation after surgery, better post-operative pain control and overall outcome.

Perioperative management of post-COVID-19 surgical patients: Indian Society of Anaesthesiologists (ISA National) Advisory and Position Statement.

Perioperative management of post-COVID-19 surgical patients: Indian Society of Anaesthesiologists (ISA National) Advisory and Position Statement.

Patient-Controlled Epidural Analgesia/Continuous Epidural Catheters

Although useful for management of many types of pain, the most common indication for epidural catheter placement is for management of labor pain. High lumbar and thoracic epidural catheter placement has gained increasing popularity in recent years for the management of postoperative pain. The technique is most commonly employed for procedures in which a thoracic or an extensive abdominal incision is anticipated. Absolute contraindications for epidural catheter placement include patient refusal, uncorrected hypovolemia, increased intracranial pressure, local infection at the planned site of insertion, and patient allergy to amide/ester local anesthetics. Relative contraindications include coagulopathy, an uncooperative patient, severe anatomic abnormalities of the spine, sepsis, and hypertension. The advantages include attenuation of the sympathetic response to surgical stimulation and pain; effects on the cardiovascular, respiratory, and gastrointestinal systems; thromboprotective effects; and possibly limitation of tumor spread. The risks of epidural catheter placement include epidural hematoma, infection, nerve or spinal cord injury, dural puncture, or respiratory or cardiovascular depression from a high block. Epidural opioids provide analgesia without causing motor or sympathetic blockade. Epidurally administered local anesthetics may result in decreased postoperative ileus, nausea, vomiting, and sedation, which can be associated with opioids. Local anesthetics and opioids act additively or synergistically and, when used together, can lead to a reduction in the dose of each drug. This review contains 2 figures, 4 tables and 30 references.

Patient-Controlled Epidural Analgesia/Continuous Epidural Catheters

Although useful for management of many types of pain, the most common indication for epidural catheter placement is for management of labor pain. High lumbar and thoracic epidural catheter placement has gained increasing popularity in recent years for the management of postoperative pain. The technique is most commonly employed for procedures in which a thoracic or an extensive abdominal incision is anticipated. Absolute contraindications for epidural catheter placement include patient refusal, uncorrected hypovolemia, increased intracranial pressure, local infection at the planned site of insertion, and patient allergy to amide/ester local anesthetics. Relative contraindications include coagulopathy, an uncooperative patient, severe anatomic abnormalities of the spine, sepsis, and hypertension. The advantages include attenuation of the sympathetic response to surgical stimulation and pain; effects on the cardiovascular, respiratory, and gastrointestinal systems; thromboprotective effects; and possibly limitation of tumor spread. The risks of epidural catheter placement include epidural hematoma, infection, nerve or spinal cord injury, dural puncture, or respiratory or cardiovascular depression from a high block. Epidural opioids provide analgesia without causing motor or sympathetic blockade. Epidurally administered local anesthetics may result in decreased postoperative ileus, nausea, vomiting, and sedation, which can be associated with opioids. Local anesthetics and opioids act additively or synergistically and, when used together, can lead to a reduction in the dose of each drug. This review contains 2 figures, 4 tables and 30 references.

Postoperative opioid administration characteristics associated with opioid-induced respiratory depression: Results from the PRODIGY trial

Study objectiveOpioid administration for pain in general care floor patients remains common, and can lead to adverse outcomes, including respiratory compromise. The PRODIGY trial found that among ward patients receiving parenteral opioids, 46% experienced ≥1 respiratory depression episode. The objective of this analysis was to evaluate the geographic differences of opioid administration and examine the association between opioid administration characteristics and the occurrence of respiratory depression. DesignProspective observational trial. Setting16 general care medical and surgical wards in Asia, Europe, and the United States. Patients1335 patients receiving parenteral opioids. InterventionsBlinded, alarm-silenced continuous capnography and pulse oximetry monitoring. MeasurementsOpioid-induced respiratory depression, defined as respiratory rate ≤ 5 bpm, SpO2 ≤ 85%, or ETCO2 ≤ 15 or ≥ 60 mmHg for ≥3 min; apnea episode lasting >30 s; or any respiratory opioid-related adverse event. ResultsAcross all patients, 58% received only long-acting opioids, 16% received only short-acting (<3 h) opioids, and 21% received a combination of short- and long-acting (≥3 h) opioids. The type and median total morphine milligram equivalent (MME) of opioid administered varied significantly by region, with 31.5 (12.5–76.7) MME, 31.0 (6.2–99.0) MME, and 7.2 (1.7–18.7) MME in the United States, Europe, and Asia, respectively (p < 0.001). Considering only postoperative opioids, 54% (N = 119/220) and 45% (N = 347/779) of patients receiving only short-acting opioids or only long-acting opioids experienced ≥1 episode of opioid-induced respiratory depression, respectively. Multivariable analysis identified post-procedure tramadol (OR 0.62, 95% CI 0.424–0.905, p = 0.0133) and post-procedure epidural opioids (OR 0.485, 95% CI 0.322–0.731, p = 0.0005) being associated with a significant reduction in opioid-induced respiratory depression. ConclusionsDespite varying opioid administration characteristics between Asia, Europe, and the United States, opioid-induced respiratory depression remains a common global problem on general care medical and surgical wards. While the use of post-procedure tramadol or post-procedure epidural opioids may reduce the incidence of respiratory depression, continuous monitoring is also necessary to ensure patient safety when receiving postoperative opioids. Registration numberwww.clinicaltrials.gov, ID: NCT02811302

Pain management after complex spine surgery: A systematic review and procedure-specific postoperative pain management recommendations.

BACKGROUNDComplex spinal procedures are associated with intense pain in the postoperative period. Adequate peri-operative pain management has been shown to correlate with improved outcomes including early ambulation and early discharge.OBJECTIVESWe aimed to evaluate the available literature and develop recommendations for optimal pain management after complex spine surgery.DESIGN AND DATA SOURCESA systematic review using the PROcedure SPECific postoperative pain managemenT methodology was undertaken. Randomised controlled trials and systematic reviews published in the English language from January 2008 to April 2020 assessing postoperative pain after complex spine surgery using analgesic, anaesthetic or surgical interventions were identified from MEDLINE, EMBASE and Cochrane Databases.RESULTSOut of 111 eligible studies identified, 31 randomised controlled trials and four systematic reviews met the inclusion criteria. Pre-operative and intra-operative interventions that improved postoperative pain were paracetamol, cyclo-oxygenase (COX)-2 specific-inhibitors or non-steroidal anti-inflammatory drugs (NSAIDs), intravenous ketamine infusion and regional analgesia techniques including epidural analgesia using local anaesthetics with or without opioids. Limited evidence was found for local wound infiltration, intrathecal and epidural opioids, erector spinae plane block, thoracolumbar interfascial plane block, intravenous lidocaine, dexmedetomidine and gabapentin.CONCLUSIONSThe analgesic regimen for complex spine surgery should include pre-operative or intra-operative paracetamol and COX-2 specific inhibitors or NSAIDs, continued postoperatively with opioids used as rescue analgesics. Other recommendations are intra-operative ketamine and epidural analgesia using local anaesthetics with or without opioids. Although there is procedure-specific evidence in favour of intra-operative methadone, it is not recommended as it was compared with shorter-acting opioids and due to its limited safety profile. Furthermore, the methadone studies did not use non-opioid analgesics, which should be the primary analgesics to ultimately reduce overall opioid requirements, including methadone. Further qualitative randomised controlled trials are required to confirm the efficacy and safety of these recommended analgesics on postoperative pain relief.

Postoperative Analgesia with Epidural Infusion of Buprenorphine Versus Transdermal Buprenorphine in Total Abdominal Hysterectomy: A Prospective Observational Cohort Study

Introduction: Transdermal Buprenorphine (TDB) patches have recently gained popularity owing to its non-invasive dosing, minimal side-effects and longer duration. Epidural opioids provide excellent analgesia thus permitting early ambulation. Aim: To compare the efficacy of epidural buprenorphine infusion and TDB to relieve postoperative pain following total abdominal hysterectomy. Materials and Methods: In this prospective observational cohort study, 116 patients undergoing total abdominal hysterectomy in a tertiary care institution, were divided into two equal groups. All patients were given subarachnoid anaesthesia using 3.4 ml 0.5% bupivacaine heavy with 60 μg buprenorphine. Group T patients had TDB (10 μg/h) patch applied 12 hours prior to procedure; while Group E patients received epidural buprenorphine infusion (10 μg/h) postoperatively. Postoperative analgesia was assessed using Numerical Rating Scale (NRS) at 2 hours, 4 hours, 24 hours, 36 hours, 48 hours, 60 hours, 72 hours after surgery. Inj. diclofenac 75 mg IV or Inj. paracetamol 1gm Intravenous (IV) infusion were given as rescue analgesic. The requirement of rescue analgesics was also recorded every 24 hours. Occurrence of adverse effects like sedation, respiratory depression, hypotension, bradycardia, nausea, vomiting, pruritus, headache, dizziness etc., were observed and compared between the two groups. Chi-square and Independent t-test were used for categorical and continuous variables, respectively. Results: Better postoperative analgesia with lower NRS scores were seen in Group E when compared to Group T at all the measured intervals (p-value&lt;0.001). The median rescue analgesic requirement was significantly higher in Group T {Diclofenac 75 (0,150) mg, Paracetamol 2 (1,2) g} than Group E {Diclofenac 0 (0, 75) mg, Paracetamol 1 (0, 1) g}. Sedation was more for epidural buprenorphine at 2 hour, 24 hours, 36 hours and 48 hours. The occurrence of nausea and vomiting was more with TDB (p-value&lt;0.001). There were no other significant adverse effects in both the study groups. Conclusion: Epidural infusion of buprenorphine is safe and more effective than an equal dose of TDB in postoperative analgesia for abdominal hysterectomy.

Impact of surgical technique and analgesia on clinical outcomes after lung transplantation: A STROBE-compliant cohort study.

There is paucity of data on the impact of surgical incision and analgesia on relevant outcomes.A retrospective STROBE-compliant cohort study was performed between July 2007 and August 2017 of patients undergoing lung transplantation. Gender, age, indication for lung transplantation, and the 3 types of surgical access (Thoracotomy (T), Sternotomy (S), and Clamshell (C)) were used, as well as 2 analgesic techniques: epidural and intravenous opioids. Outcome variables were: pain scores; postoperative hemorrhage in the first 24 hours, duration of mechanical ventilation, and length of stay at intensive care unit (ICU).Three hundred forty-one patients were identified. Thoracotomy was associated with higher pain scores than Sternotomy (OR 1.66, 95% CI: 1.01; 2.74, P: .045) and no differences were found between Clamshell and Sternotomy incision. The median blood loss was 800 mL [interquartile range (IQR): 500; 1238], thoracotomy patients had 500 mL [325; 818] (P < .001). Median durations of mechanical ventilation in Thoracotomy, Sternotomy, and Clamshell groups were 19 [11; 37] hours, 34 [IQR 16; 57.5] hours, and 27 [IQR 15; 50.5] hours respectively. Thoracotomy group were discharged earlier from ICU (P < .001).Thoracotomy access produces less postoperative hemorrhage, duration of mechanical ventilation, and lower length of stay in ICU, but higher pain scores and need for epidural analgesia.

Comparison of intravenous lidocaine versus epidural anesthesia for traumatic rib fracture pain: a retrospective cohort study

BackgroundEffective analgesia is essential in managing traumatic rib fractures. Intravenous lidocaine (IVL) is effective in treating perioperative pain, acute pain in the emergency department, cancer pain in hospice, and outpatient...