Predictive Clinical Factors of Pain-Related Quality of Recovery Following Elective Gastrointestinal and Hepato-Pancreato-Biliary Surgery: An Observational Study in Norway

Purpose

This observational cohort study aimed to identify predictive factors associated with pain-related quality of recovery among patients undergoing elective gastrointestinal and hepato-pancreato-biliary surgery.

Patients and Methods

This study involved a secondary analysis of the data collected from five hospitals across all healthcare regions in Norway to validate the Norwegian version of the Quality of Recovery-15 (QoR-15NO). The sample consisted of 268 adult patients who underwent elective gastrointestinal and hepato-pancreato-biliary surgery between September 2021 and May 2022. Data were collected using QoR-15NO upon admission for surgery and on the first postoperative day, and surgery severity was classified using the Surgical Outcome Risk Tool. A linear mixed model and multivariate linear regression were used to investigate associations between postoperative scores and possible predictive clinically relevant factors.

Results

The results of this study showed that postoperative pain was significantly associated with age, gender, severity of surgery, and changes from pre- to postoperative status. Younger patients, compared to older patients (b=0.23, 95% CI: [0.03, 0.41]), female patients (b=-0.61, 95% CI: [-1.19, -0.04]), patients undergoing minor and intermediate surgeries compared to major surgeries (b=0.96, 95% CI: [0.00, 1.92]) all reported higher levels of postoperative pain. There was a significant decline in QoR post-surgery due to increased pain severity (b=-1.91, 95% CI: [-2.33, -1.50]; p <0.001). No clinically significant associations were found between ASA physical status, surgery duration, and pain-related QoR.

Conclusion

This study identified age, gender, and surgery severity as key predictors of postoperative pain. Younger and female patients and those undergoing minor surgeries are at higher risk for severe postoperative pain. Proactive approaches for minor surgeries and tailored pain management for younger patients and females might enhance recovery and postoperative pain outcomes. Thus, future research should focus on the long-term effects of individualized pain management and additional strategies for high-risk patient groups.

Postoperative Pain at Discharge From the Post-anesthesia Care Unit: A Case-Control Study

INTRODUCTION

Despite advancements in postoperative pain management, approximately 20% of patients still experience severe pain within the first 24 hours post-surgery. Previous studies utilizing machine learning have shown promise in predicting postoperative pain with various models. This study investigates postoperative pain predictors using a machine learning approach based on physiological indicators and demographic factors in a Mexican cohort.

METHODS

We conducted a retrospective case-control study to assess pain determinants at Post-anesthesia Care Unit (PACU) discharge at Hospital Ángeles Lomas in Mexico City. Data were collected from 550 patients discharged from the PACU, including 292 cases and 258 controls, covering a range of surgical procedures and illnesses. Machine learning techniques were employed to develop a predictive model for postoperative pain. Physiological responses, such as blood pressure, heart rate, respiratory rate, and anesthesia type, were recorded prior to PACU admission.

RESULTS

Significant differences were found between cases and controls, with factors such as sex, anesthesia type, and physiological responses influencing postoperative pain. Visual analog scale (VAS) scores at PACU admission were predictive of pain at discharge.

CONCLUSIONS

Our findings reinforce existing literature by highlighting sex-based disparities in pain experiences and the influence of anesthesia type on pain levels. The logistic regression model developed, incorporating physiological responses and sex, shows potential for refining pain management strategies. Limitations include the lack of detailed surgical data and psychological factors, and validation in a prospective cohort. Future research should focus on more comprehensive predictive models and longitudinal studies to further improve postoperative pain management.

Can a Continuous Wound Infiltration System Replace Intravenous Patient-Controlled Analgesia for Postoperative Pain Management after a Single-Port Access Laparoscopy?

Background: The aim of this study was to determine whether continuous wound infiltration (CWI) can replace intravenous patient-controlled analgesia (IV PCA) and to investigate effective pain control strategies after a single-port access (SPA) laparoscopy for adnexal disease. Methods: A total of 470 patients (the CWI group [n = 109], the IV PCA group [n = 198], and the combined group [n = 163]) who underwent an SPA adnexal laparoscopy and who received CWI or IV PCA for postoperative pain management were retrospectively reviewed. The numeric rating scale (NRS) pain score at 6, 12, 24, and 48 h (h) after surgery and the total amount of fentanyl administered via IV PCA were collected. The incidence of postoperative nausea and vomiting (PONV) and the total amount of rescue antiemetic drugs administered were also evaluated. Results: The mean NRS pain scores at 6 h (combined vs. PCA vs. CWI, 3.08 vs. 3.44 vs. 3.96, p < 0.001), 12 h (2.10 vs. 2.65 vs. 2.82, p < 0.001), and 24 h (1.71 vs. 2.01 vs. 2.12, p < 0.001) after surgery were significantly lower in the combined group. CWI showed a similar pain-reduction effect after surgery compared to IV PCA, except for the acute phase (within 6 h after surgery). The incidence of PONV during the entire hospitalization period was significantly lower in the CWI group compared to the groups using IV PCA (p < 0.05). The combined group had a significantly lower incidence of PONV and use of rescue antiemetics than the IV PCA group (p < 0.05). The combined group required significantly less total PCA fentanyl compared to the IV PCA group (combined vs. PCA, 622.1 μg vs. 703.1 μg, p < 0.001). Conclusions: CWI is an effective alternative to IV PCA and has fewer side effects. Combined use of CWI and IV PCA may be an ideal pain management strategy, offering a strong pain-reduction effect and only moderate side effects.

Postoperative pain at Landspitali: A prospective study

BACKGROUND

Moderate or severe postoperative pain is common despite advances in surgical technique and perioperative analgesia. This study aimed to assess the prevalence and severity of postoperative pain following procedures requiring anaesthesia and identify factors associated with increased risk of postoperative pain.

METHODS

Surgical patients ≥18 years of age were prospectively questioned on level of current pain on a numerical rating scale (NRS) from 0 to 10 in the post-anaesthesia care unit (PACU) and on resting, active and worst pain experienced in the first 24 h postoperatively. Clinical data was obtained from medical records. Descriptive statistics were applied, and predictors of worst pain assessed as moderate/severe (NRS ≥ 5) on postoperative day one were assessed using multivariable logistic regression.

RESULTS

Of 438 included participants, moderate/severe pain occurred in 29% on the day of surgery and 70% described their worst pain as moderate/severe on postoperative day one. Procedures with the highest incidence of moderate/severe pain on the day of surgery were gynaecology-, plastic-, abdominal-, breast-, and orthopaedic procedures. On postoperative day one, patients undergoing vascular-, orthopaedic-, and abdominal operations most commonly rated their worst pain as moderate/severe. Female sex (OR = 2.15, 95% Cl 1.21-3.88, p = .010), chronic preoperative pain (OR = 4.20, 95% Cl 2.41-7.51, p < .001), undergoing a major procedure (OR = 2.07, 95% Cl 1.15-3.80, p = .017), and any intraoperative remifentanil administration (OR = 2.16, 95% Cl 1.20-3.94, p = .01) had increased odds of rating the worst pain as moderate/severe. Increased age (OR = 0.66 per 10 years (95% Cl 0.55-0.78, p < .001)) and undergoing breast-, gynaecology-, otolaryngology-, and neurosurgery (OR = 0.15-0.34, p < .038) was associated with lower odds of moderate/severe pain on postoperative day one.

DISCUSSION

In our cohort, patients rated their current pain in the PACU similarly to other studies. However, the ratio of patients rating the worst pain experienced as moderate/severe on postoperative day one was relatively high. The identified patient- and procedural-related factors associated with higher odds of postoperative pain highlight a subgroup of patients who may benefit from enhanced perioperative monitoring and pain management strategies.

Evaluation of nurse-reported missed care in a post-anesthesia care unit: A mixed-methods study

BACKGROUND

Nurse-reported missed care (NRMC) is considered as any significant delay or omission in provision of nursing care.

AIM

(i) Evaluate the frequency, types, and reasons for NRMC in the Post-anesthesia Care Unit (PACU). (ii) Evaluate associations between nurse demographic and workload factors with NRMC. (iii) Explore nurses' perception of NRMC in the PACU.

METHODS

A cross-sectional study was conducted in the PACU in a tertiary acute care hospital over 3 months. Full-time PACU nurses were conveniently sampled to complete an anonymous survey after their daily shift over different shifts. It contained three sections: (i) nurse demographics; (ii) elements of NRMC; and (iii) reasons for NRMC. Qualitative interviews employed a semi-structured guide to explore perceptions and experiences of NRMC. Descriptive, inferential statistics, and thematic analyses were applied.

RESULTS

Sixty-six survey responses were collected. 48.5% of respondents indicated at least one NRMC activity. Activities more clinically sensitive were less missed. Eight nurses were interviewed. Four main themes were identified: (i) communication with patients; (ii) communication and teamwork with colleagues; (iii) dual role of documentation; and (iv) staffing inadequacy. Language barriers made communication challenging. Staff shortage exacerbates workload but effective teamwork and documentation facilitates nursing care.

CONCLUSION

Communication and staffing concerns aggravate NRMC. Teamwork and personal contentment were satisfactory. Nurses' turnover intention may worsen staffing.

CLINICAL RELEVANCE

Timeliness and quality of nursing care is impacted by elements such as manpower, allocation of resources, work processes, and workplace environmental or interpersonal factors such as culture and language fit. Re-evaluation of nursing resources and work processes may assist post-anesthesia care unit nurses in fulfilling their role, decreasing the prevalence of nurse-reported missed care.

The Analgesic Properties of a Music Intervention in the Postanesthesia Care Unit

PURPOSE

The purpose of this study was to determine whether a combined music pharmacological intervention was an effective multimodal approach to reduce adult pain in the postanesthesia care unit (PACU).

DESIGN

A prospective, randomized control trial study.

METHODS

Participants were recruited in the preoperative holding area on the day of surgery by the principal investigators. Music was selected by the patient following the informed consent process. Participants were randomized either to the intervention group or the control group. Patients in the intervention group received music in addition to standard pharmacological protocol while the control group received only the standard pharmacological protocol. Measured outcomes were change in visual analog pain scores and length of stay.

FINDINGS

In this cohort (N = 134), 68 participants (50.7%) received the intervention, and 66 participants (49.3%) were in the control group. Paired t tests showed that pain scores for the control group worsened by an average of 1.45-points (95% CI: 0.75, 2.15; P < .001) compared to 0.34-points in the intervention group and was not significant (P = .314) as scores went from 1 out of 10 to 1.4 out of 10. Both control and intervention groups experienced pain, with the control group's overall pain scores worsening over time. This finding was statistically significant (P = .023). No statistically significant difference was noted in the average PACU length of stay (LOS).

CONCLUSIONS

The addition of music to the standard postoperative pain protocol demonstrated a lower average pain score on discharge from the PACU. The absence of a difference in LOS may be due to the confounding variables (eg, general versus spinal anesthesia or a difference in voiding time).

Use of Transversus Abdominis Plane Block in Hysterectomy: A Systematic Review

PURPOSE

To examine the effectiveness of transversus abdominis plane (TAP) block in hysterectomy.

DESIGN

Systematic review METHODS: This review followed the guidelines of the PRISMA statement. PubMed, CINAHL, the Cochrane Collaboration, Google Scholar, and other gray literature databases were searched for eligible studies. The evidence level and quality ratings were assessed using the guidelines proposed by the Johns Hopkins Nursing Evidence-Based Practice Model.

FINDINGS

Six randomized controlled trials and three systematic reviews with meta-analysis consisting of 2,164 patients were analyzed. The use of TAP block reduced the pain scores in the early part of the postoperative period with diminishing effect late in the postoperative phase. In addition, TAP block lowered the overall opioid consumption, reduced the incidence of PONV, and prolonged the time for rescue medication. All studies included in the review were categorized as Level I and rated Grade A implying strong confidence in the true effects of TAP block in all outcome measures in the review.

CONCLUSIONS

The addition of TAP block for pain control in hysterectomy patients can improve postoperative pain management. This review found that TAP block has opioid-sparing effects and is safe and effective in reducing pain scores postoperatively in hysterectomy patients.

The postoperative analgesic efficacy of different regional anesthesia techniques in breast cancer surgery: A network meta-analysis

Background

Regional anesthesia have been successfully performed for pain management in breast cancer surgery, but it is unclear which is the best regional anesthesia technique. The aim of the present network meta-analysis was to assess the analgesic efficacy and disadvantages of regional anesthesia techniques.

Methods

Multiple databases were searched for randomized controlled trials (RCTs). The association between regional anesthesia and analgesic efficacy was evaluated by Bayesian network meta-analysis.

Results

We included 100 RCTs and 6639 patients in this study. The network meta-analysis showed that paravertebral nerve block, pectoral nerve-2 block, serratus anterior plane block, erector spinae plane block, rhomboid intercostal block, and local anesthetic infusion were associated with significantly decreased postoperative pain scores, morphine consumption and incidence of postoperative nausea and vomiting compared with no block. Regarding the incidence of chronic pain, no significance was detected between the different regional anesthesia techniques. In the cumulative ranking curve analysis, the rank of the rhomboid intercostal block was the for postoperative care unit pain scores, postoperative 24-hour morphine consumption, and incidence of postoperative nausea and vomiting.

Conclusion

Regional anesthesia techniques including, paravertebral nerve block, pectoral nerve-2 block, serratus anterior plane block, erector spinae plane block, rhomboid intercostal block, and local anesthetic infusion, can effectively alleviate postoperative acute analgesia and reduce postoperative morphine consumption, but cannot reduce chronic pain after breast surgery. The rhomboid intercostal block might be the optimal technique for postoperative analgesia in breast cancer surgery, but the strength of the evidence was very low.

Systematic review registration

https://www.crd.york.ac.uk/prospero/(PROSPERO), identifier CRD 42020220763.

Identification of Risk Factors Contributing to Prolonged Stay in the Post-anaesthesia Care Unit at a Tertiary Care Hospital in Abu Dhabi, United Arab Emirates

INTRODUCTION

Post-anesthesia care units (PACU) were developed to reduce postoperative morbidity and mortality and the ideal duration of postoperative stay has been proposed as two hours; however, the incidence and risk factors for prolonged stay are variable. The objective of this study was to assess the incidence of prolonged length of stay in the post-anesthesia care unit at Sheikh Khalifa Medical City (SKMC), Abu Dhabi, United Arab Emirates, and identify the risk factors contributing to it.

METHODS AND MATERIALS

This is a retrospective observational study of patients who stayed in the PACU for more than two hours. A total of 2387 patients, both male and female, who underwent surgical procedures between May 2022 to August 2022 at SKMC and were admitted to the PACU after surgery were included in the study and their data were analyzed.

RESULTS

Of the 2387 patients who underwent surgical procedures, 43 (1.8%) had prolonged stays in the PACU. Of these, 20 (47%) were adult cases and 23 (53%) were pediatric cases. The main reasons for the delay in discharge from PACU in our study were the non-availability of ward beds (25.5%), followed by pain management (18.6%).

CONCLUSIONS

We recommend improving the communication between different specialties, restructuring staffing, implementing changes in perioperative management, and changing operating room scheduling to prevent avoidable reasons contributing to a prolonged stay in the PACU.

Post-operative pain and associated factors after cesarean section at Hawassa University Comprehensive Specialized Hospital, Hawassa, Ethiopia: A cross-sectional study

Background

The most frequent obstetric surgery both in Ethiopia and around the world is the cesarean section (CS). Postoperative pain that is not well managed can have a major negative impact on surgical patient morbidity, delaying healing and the return to normal daily activities. Even though the cesarean section is one of the most commonly performed operations, postoperative pain after cesarean section and associated factors has not been studied.

Objective

To assess the magnitude and factors associated with postoperative pain after cesarean section at Hawassa University Comprehensive Specialized Hospital, Hawassa, Ethiopia.

Methods

From February 1 to September 30 in 2021, a hospital-based cross-sectional study was undertaken among women who underwent cesarean deliveries at Hawassa University Comprehensive Specialized Hospital. The patient's medical file was read, and information was gathered from them using a structured questionnaire and checklist. The information was prepared for analysis by being cleaned, coded, and put into EPI Data version 3.1 before being exported to SPSS version 20. The prevalence rate and socio-demographic details were displayed using descriptive statistics. Bivariate and multivariable logistic regression analysis was done to identify the associated factors. Variables with a p-value of <0.05 were considered statistically significant.

Results

The magnitude of moderate to severe post-operative pain after a cesarean section was 89.8% (95% CI 84.7, 93.5). Duration of procedure (AOR: 3.62, 95% CI: 1.33, 15.85), type of anesthesia (AOR: 2.38, 95% CI: 1.31, 8.71), and type of analgesics administered (AOR: 2.3, 95% CI: 1.28, 19.21) were significantly associated with moderate to severe post-operative pain.

Conclusion

In this study a significant number of parturient in this study reported moderate to severe post-cesarean pain within 24 h. The duration of the procedure, the type of anesthesia used, and the type of analgesics administered were all found to be significantly associated with postoperative pain after cesarean section.

•

The magnitude of post-operative pain after a caesarean section was 89.8%.

•

About 84.2% reported moderate to severe pain at 24 h after surgery.

•

Duration of procedure was significantly associated to postoperative pain.

•

Anesthesia type used was found to be significantly associated to postoperative pain.

Factors Causing Delay in Discharge in Patients Eligible for Ambulatory Lumbar Fusion Surgery

STUDY DESIGN

Retrospective review of prospectively collected data.

OBJECTIVE

To analyze the postoperative factors that led delayed discharge in patients who would have been eligible for ambulatory lumbar fusion (ALF).

SUMMARY OF BACKGROUND DATA

Assessing postoperative inefficiencies is vital to increase the feasibility of ALF.

MATERIALS AND METHODS

Patients who underwent single-level minimally invasive transforaminal lumbar interbody fusion and would have met the eligibility criteria for ALF were included. Length of stay (LOS); time in postanesthesia recovery unit (PACU); alertness and neurological examination, and pain scores at three and six hours; type of analgesia; time to physical therapy (PT) visit; reasons for PT nonclearance; time to per-oral (PO) intake; time to voiding; time to readiness for discharge were assessed. Time taken to meet each discharge criterion was calculated. Multiple regression analyses were performed to study the effect of variables on postoperative parameters influencing discharge.

RESULTS

Of 71 patients, 4% were discharged on the same day and 69% on postoperative day 1. PT clearance was the last-met discharge criterion in 93%. Sixty-six percent did not get PT evaluation on the day of surgery. Seventy-six percent required intravenous opioids and <60% had adequate pain control. Twenty-six percent had orthostatic intolerance. The median postoperative LOS was 26.9 hours, time in PACU was 4.2 hours, time to PO intake was 6.5 hours, time to first void was 6.3 hours, time to first PT visit was 17.7 hours, time to PT clearance was 21.8 hours, and time to discharge readiness was 21.9 hours. Regression analysis showed that time to PT clearance, time to PO intake, time to voiding, time in PACU, and pain score at three hours had a significant effect on LOS.

CONCLUSIONS

Unavailability of PT, surgery after 1  pm , orthostatic intolerance, inadequate pain control, prolonged PACU stay, and long feeding and voiding times were identified as modifiable factors preventing same-day discharge.

LEVEL OF EVIDENCE

4.

ABO blood group is not a predictive factor for the amount of early opioid consumption in postanesthesia care unit: a prospective cohort study in 3,316 patients

Background

Immediate postoperative pain in the postanesthesia care unit (PACU) is common. Titration of opioid is the most popular strategy for controlling early postoperative pain. ABO blood group has been found to be associated with pain perception. We aimed to find the factors including ABO blood group for predicting the amount of opioid requirement in PACU.

Methods

This prospective cohort study was performed in 3316 patients who underwent various kinds of anesthetic techniques and received immediate postoperative care in PACU. Preoperative, intraoperative and PACU data were collected. A directed acyclic graph (DAG) representing the hypothesized causal pathways of preoperative, intraoperative and PACU data were compiled prior to conducting multinomial logistic regression analysis. Statistical significance in all models was defined as a P-value < 0.05.

Results

Female sex, body mass index, preoperative use of gabapentin, preoperative anxiety score, anesthetic techniques, type of operation, amount of consumed intraoperative opioids, intraoperative use of paracetamol, parecoxib and ondansetron, duration of anesthesia and surgery, amount of blood loss, pain upon PACU arrival, use of paracetamol and parecoxib in PACU were found to be factors influencing amount of opioid consumption in PACU. ABO blood group was not associated with early postoperative opioid requirement.

Conclusions

A significant number of factors are related to amount of opioid requirement in PACU. Some factors can be adjusted to provide better pain relief in early postoperative period. However, ABO blood group is not identified to be a predictive factor for early postoperative opioid consumption in PACU.

Postoperative Pain Management Using Supplemental Bupivacaine After Mandibular Orthognathic Surgery: A Triple-Blind Randomized Controlled Clinical Trial

PURPOSE

The objective of this triple-blind, randomized, placebo-controlled trial was to assess the clinical analgesic efficacy of 0.5% bupivacaine in acute postoperative pain management after bilateral sagittal split ramus osteotomy (BSSO).

METHODS

Patients were randomly allocated into the experimental (0.5% bupivacaine with 1:200000 epinephrine) or control group (normal saline - placebo) using block randomization. The interventions were administered at the inferior alveolar nerve block and buccal nerve block sites bilaterally after the BSSO surgery. Analgesic efficacy was assessed in terms of the patient's pain perception measured by a numerical rating scale (0 to 10), rescue drug requirement, and duration of analgesia for 24 hours after the surgery. The statistical analysis was blinded to the allocation groups, and P-value of <.05 was considered as a significant difference for all tests.

RESULTS

In total, 28 patients underwent BSSO (ie, 14 in each group). There was no significant difference in pain perception of patients injected with 0.5% bupivacaine and those administered with placebo during the 24 hours after the surgery (P > .05). Three patients in the bupivacaine group took the rescue drug after the surgery (mean duration - 268 minutes) and 1 patient in the placebo group took the rescue drug after 27 minutes.

CONCLUSIONS

Postoperative use of bupivacaine did not show a superior analgesic efficacy when compared with normal saline in controlling acute postoperative pain after BSSO.

Predictors of maximal postoperative pain at rest in adult patients undergoing elective surgery - A multicenter observational study

The aim of this prospective cohort study was to assess the maximum intensity of postoperative pain at rest in 620 adults after an elective surgery as well as to determine demographic and clinical predictors of pain. The Hospital Anxiety and Depression Scale was used to evaluate the preoperative mental condition of the patient. Preoperative and postoperative pain were assessed at rest based on the Numeric Rating Scale (range: 0-10). The total median maximum intensity of pain was 3 (interquartile range: 1-5). The linear regression model for the maximum intensity of postoperative pain was statistically significant and very well fitted - the coefficient of determination was 62%. Preoperative anxiety, pain, cancer, a medical history of thyroid (vs abdominal) surgery, and an operation resulting in major (vs moderate) tissue injury have a positive impact on the maximum intensity of postoperative pain. Eye surgery and lower limb operations gave lower scores than abdominal surgery. The early identification of these predictors in patients at risk for postoperative pain will help in preparing an individual pain management plan.

Predictors of severe postoperative pain after orthopedic surgery in the immediate postoperative period

AIM

Severe pain in the immediate postoperative period can negatively affect patients' quality of recovery, prolong hospital stay, and increase the risk of developing persistent pain. This study aimed to examine the predictors of severe postoperative pain in the immediate postoperative period among orthopedic trauma patients.

METHODS

A prospective observational study design was used. Data were collected from 153 patients that underwent orthopedic surgery procedures. Pain scores were assessed by a numeric pain scale at 45 min in the Post Anesthesia Care Unit. Physical health status was measured by the American Society of Anesthesiologists Status Classification System, and total dose of opioids (converted to morphine equivalents) and other demographic and clinical characteristics were recorded from medical records.

RESULTS

Preoperative smoking and physical health status were statistically significant predictors of severe postoperative pain in the immediate postoperative period. The odds of severe postoperative pain for smokers were 2.42 times the odds of nonsmokers. Patients with severe systemic disease showed 4.27 times lower odds of severe pain than more healthy patients.

CONCLUSION

Preoperative predictors of severe postoperative pain should be considered when assessing and treating orthopedic patients postoperatively to assure adequate pain relief.

Quantitative Sensory Testing to Predict Postoperative Pain

Purpose of Review

We review the relevance of quantitative sensory testing (QST) in light of acute and chronic postoperative pain and associated challenges.

Recent Findings

Predicting the occurrence of acute and chronic postoperative pain with QST can help identify patients at risk and allows proactive preventive management. Generally, central QST testing, such as temporal summation of pain (TSP) and conditioned pain modulation (CPM), appear to be the most promising modalities for reliable prediction of postoperative pain by QST. Overall, QST testing has the best predictive value in patients undergoing orthopedic procedures.

Summary

Current evidence underlines the potential of preoperative QST to predict postoperative pain in patients undergoing elective surgery. Implementing QST in routine preoperative screening can help advancing traditional pain therapy toward personalized perioperative pain medicine.

A Scoping Review of Intravenous Opioid Pain Protocols and Their Dose-Time Intervals in the Management of Acute Postoperative Pain in the Postanesthesia Care Unit

PURPOSE

This review aims to explore intravenous opioid pain protocols and their dose-time intervals in managing acute postoperative pain in adults in the postanesthesia care unit (PACU).

DESIGN

A scoping review using a systematic search strategy.

METHODS

Sixteen articles were identified from MEDLINE, CINAHL, PubMed, Embase, and Cochrane specific to the aims.

FINDINGS

The literature demonstrated several variations on dose-time intervals used for opioid pain protocol administration globally. Furthermore, opioid analgesic pain protocols in the PACU appear to be effective in postoperative pain management. However, the literature did not identify optimal time intervals related to dose administration within these protocols.

CONCLUSIONS

Literature gaps were identified regarding the significance of dose-time intervals when using opioid analgesic pain protocols in the PACU.

Efficacy of erector spinae plane block for analgesia in breast surgery: a systematic review and meta-analysis

The erector spinae plane block is a new regional anaesthesia technique that provides truncal anaesthesia for breast surgery. This systematic review and meta-analysis was undertaken to determine if the erector spinae plane block is effective at reducing pain scores and opioid consumption after breast surgery. This study also evaluated the outcomes of erector spinae plane blocks compared with other regional blocks. PubMed, Embase, Scopus, the Cochrane Central Register of Controlled Trials and ClinicalTrials.gov were searched. We included randomised controlled trials reporting the use of the erector spinae plane block in adult breast surgery. Risk of bias was assessed with the revised Cochrane risk-of-bias tool. The Grading of Recommendations, Assessment, Development and Evaluation (GRADE) framework was used to assess trial quality. Thirteen randomised controlled trials (861 patients; 418 erector spinae plane block, 215 no blocks, 228 other blocks) were included. Erector spinae plane block reduced postoperative pain compared with no block: at 0-2 hours (mean difference (95% CI) -1.63 (-2.97 to -0.29), 6 studies, 329 patients, high-quality evidence, I²  = 98%, p = 0.02); at 6 hours (mean difference (95% CI) -0.90 (-1.49 to -0.30), 5 studies, 250 patients, high-quality evidence, I²  = 91%, p = 0.003); at 12 hours (mean difference (95% CI) -0.46 (-0.67 to -0.25), 5 studies, 250 patients, high-quality evidence, I²  = 58%, p < 0.0001); and at 24 hours (mean difference (95% CI) -0.50 (-0.70 to -0.30), 6 studies, 329 patients, high-quality evidence, I²  = 76%, p < 0.00001). Compared with no block, erector spinae plane block also showed significantly lower postoperative oral morphine equivalent requirements (mean difference (95% CI) -21.55mg (-32.57 to -10.52), 7 studies, 429 patients, high-quality evidence, I²  = 99%, p = 0.0001). Separate analysis of studies comparing erector spinae plane block with pectoralis nerve block and paravertebral block showed that its analgesic efficacy was inferior to pectoralis nerve block and similar to paravertebral block. The incidence of pneumothorax was 2.6% in the paravertebral block group; there were no reports of complications of the other blocks. This review has shown that the erector spinae plane block is more effective at reducing postoperative opioid consumption and pain scores up to 24 hours compared with general anaesthesia alone. However, it was inferior to the pectoralis nerve block and its efficacy was similar to paravertebral block. Further evidence, preferably from properly blinded trials, is required to confirm these findings.