The impact of ultrasound-guided transmuscular quadratus lumborum block combined with local infiltration analgesia for arthroplasty on postoperative pain relief

Minimum effective concentration of ropivacaine for ultrasound-guided transmuscular quadratus lumborum block in total hip arthroplasty: a randomized clinical trial

OBJECTIVE

This trial aimed to identify the Minimum Effective Concentration (MEC90, defined as the concentration which can provide successful block in 90% of patients) of 30 mL ropivacaine for single-shot ultrasound-guided transmuscular Quadratus Lumborum Block (QLB) in patients undergoing Total Hip Arthroplasty (THA).

METHODS

A double-blind, randomized dose-finding study using the biased coin design up-and-down sequential method, where the concentration of local anesthetic administered to each patient depended on the response from the previous one. Block success was defined as a Numeric Rating Scale (NRS) score during motion ≤ 3 at 6 hours after arrival in the ward. If the block was successful, the next subject received either a 0.025% smaller dose (probability of 0.11) or the same dose (probability of 0.89); otherwise, the next subject received a 0.025% higher ropivacaine concentration. MEC90, MEC95 and MEC99 were estimated by isotonic regression, and the corresponding 95% Confidence Intervals (95% CIs) were calculated by the bootstrapping method.

RESULTS

Based on the analysis of 52 patients, MEC90, MEC95, and MEC99 of ropivacaine for QLB were estimated to be 0.352% (95% CI 0.334-0.372%), 0.363% (95% CI 0.351-0.383%), and 0.373% (95% CI 0.363-0.386%). The concentration of ropivacaine at 0.352% in a volume of 30 ml can provide a successful block in 90% of patients.

CONCLUSIONS

For ultrasound-guided transmuscular QLB in patients undergoing THA, 0.352% ropivacaine in a volume of 30 ml can provide a successful block in 90% of patients. Further dose-finding studies and large sample size are required to verify the concentration.

Efficacy of Supplemental Ultrasound-Guided Pericapsular Nerve Group (PENG) Block Combined with Lateral Femoral Cutaneous Nerve Block in Patients Receiving Local Infiltration Analgesia after Hip Fracture Surgery: A Prospective Randomized Controlled Trial

Background and Objectives: Local infiltration analgesia (LIA) represents a potential approach to reducing pain in patients undergoing total hip arthroplasty (THA). The pericapsular nerve group (PENG) block also provides adequate analgesia for fractures and THA. As most hip surgeries use a lateral incision, affecting the cutaneous supply by branches of the lateral femoral cutaneous nerve (LFCN), the LFCN block can contribute to postoperative analgesia. However, no studies have investigated the effectiveness of supplemental PENG block combined with LFCN block in patients undergoing LIA after hip fracture surgery. Our study aimed to assess the effectiveness of PENG combined with LFCN block following hip fracture surgery in patients who underwent LIA. Materials and Methods: Forty-six patients were randomly assigned to LIA or PENG + LFCN + LIA groups. The primary outcome was the pain score at rest and during movement at 2, 6, 12, 24, and 48 h postoperatively. The total opioid dose for postoperative analgesia was also measured at the same time points. Secondary outcomes included postoperative cognitive function assessment. Results: The median pain scores at rest and during movement were lower in the PENG + LFCN + LIA group throughout the study periods compared to the LIA group, except at 2 h (at rest) and 48 h (during movement) after surgery. The total fentanyl dose was lower in the PENG + LFCN + LIA group at all time points after surgery when compared to the LIA group. Postoperative delirium incidence and the median abbreviated mental test scores were not significantly different between the two groups. Conclusions: The combination of PENG and LFCN blocks may contribute to enhanced recovery for patients undergoing LIA after hip fracture surgery. However, further well-controlled research is necessary to determine the effectiveness of supplemental PENG combined with LFCN block in addressing cognitive deficits in these patients.

Circum-Psoas Block versus Supra-Inguinal Fascia Iliaca Block for Postoperative Analgesia in Patients Undergoing Total Hip Arthroplasty: A Randomized Clinical Trial

Purpose

Total hip arthroplasty (THA) is often associated with moderate to severe pain. The present study compared the efficacy of circum-psoas block (CPB) with supra-inguinal fascia iliaca block (SIFIB) for postoperative analgesia in patients undergoing THA.

Patients and Methods

In this randomized trial, sixty-four patients undergoing THA were allocated randomly to the CPB group or SIFIB group with 40 mL of 0.3% ropivacaine. The primary outcome was dynamic pain score at 6 h postoperatively. Secondary outcomes included dynamic pain scores at 12, 24 and 48 h; static pain scores; sensory and motor block; opioid consumption; time to first opioid request; length of hospital stay; patient satisfaction; and adverse events.

Results

CPB patients showed significantly lower dynamic pain scores at 6 (3.11 ± 0.66 vs 4.47 ± 0.74, respectively; P = 0.000), 12 (2.52 ± 0.73 vs 3.53 ± 0.85, respectively; P = 0.000) and 24 h (2.30 ± 0.57 vs 2.87 ± 0.71, respectively; P = 0.001) after surgery, as well as lower static pain scores at 6 and 12h (P = 0.001 and P = 0.033 respectively) than SIFIB patients. Lower opioid consumption was observed in the CPB group at 24 and 48 h (P = 0.000, both) than in the SIFIB group. Patients in the CPB group reported improved quadriceps strength at 6 and 12 h (P = 0.000, both), as well as better muscle strength of hip flexion at 6, 12 and 24 h (P = 0.000, P = 0.000 and P = 0.025 respectively). Compared with SIFIB, CPB was associated with increased sensory block coverage at 6, 12 and 24 h (P = 0.000, P = 0.000, and P =0.022, respectively).

Conclusion

CPB has a greater potential to alleviate postoperative pain and improve recovery in THA patients than SIFIB.

Motor-sparing peripheral nerve blocks for hip and knee surgery

PURPOSE OF REVIEW

To summarize the recent literature describing and comparing novel motor-sparing peripheral nerve block techniques for hip and knee surgery. This topic is relevant because the number of patients undergoing same day discharge after hip and knee surgery is increasing. Preserving lower extremity muscle function is essential to facilitate early physical therapy for these patients.

RECENT FINDINGS

Distal peripheral nerve blocks may allow for preserved quadriceps motor strength and comparable analgesia to traditional techniques. However, few studies in hip and knee populations include strength or function as primary outcomes. For hip surgeries, studies have failed to show analgesic differences between regional blocks and periarticular infiltration. Similarly for knee arthroplasty in the absence of periarticular infiltration, recent evidence suggests adding combinations of blocks (ACB plus iPACK or genicular nerve blocks) may balance pain control and early ambulation.

SUMMARY

The use of motor-sparing peripheral nerve block techniques enables early ambulation, adequate pain control, and avoidance of opioid-related side effects facilitating outpatient/ambulatory lower extremity surgery. Further studies of these techniques for continuous peripheral nerve block catheters are needed to assess if extended blockade continues to provide motor-sparing and opioid-sparing benefits.

The anesthetic efficacy of ultrasound-guided lumbar plexus combined with quadratus lumborum block with Shamrock approach in total hip arthroplasty: study protocol for a randomized controlled trial

INTRODUCTION

The lumbar plexus originates from multiple segments of the spinal cord. Both single-level lumbar plexus block (LPB) and transmuscular quadratus lumborum block (TQLB) are commonly used to provide analgesia for the patients undergoing total hip arthroplasty (THA). However, neither of them can completely cover the lumbar plexus. Multiple-level LPB is also not recommended since this expert technique involves more potential risks. To achieve a better anesthetic effect and avoid risks, we propose to combine ultrasound-guided LPB with TQLB with Shamrock approach. We aim to assess the anesthetic efficacy of this combination technique and expect it will be an ideal alternative for conventional LPBs in THA.

METHODS AND ANALYSIS

In this prospective randomized controlled trial, 84 patients schedule for THA will be enrolled. The patients will be randomly assigned at a 1:1:1 ratio to receive LPB at L3 level (P group), T12 paravertebral block combined with LPB at L3 and L4 levels (TP group), or LPB combined with TQLB at L3 level (PQ group). Each method will be evaluated in terms of the successful rate of sensory blockade, postoperative pain, performance time of block, requirement for intraoperative sufentanil, cumulative doses of intraoperative vasoactive medications, and adverse events.

ETHICS AND DISSEMINATION

The study protocol has been approved by the institutional review board (IRB) at Shanghai Jiao Tong University Affiliated Sixth People's Hospital, China (No.2020-031). The results will be disseminated in a peer-reviewed journal and the ClinicalTrials.gov registry.

TRIAL REGISTRATION

ClinicalTrials.gov, NCT04266236 . Registered on 10 February 2020.

CLINICALTRIALS

gov PRS: Record Summary NCT04266236 .

Quadratus lumborum block for postoperative pain management in patients undergoing total hip arthroplasty: a systematic review and meta-analysis

BACKGROUND

The use of quadratus lumborum nerve blocks (QLB) for pain control following elective total hip arthroplasty (THA) has increased substantially in recent years. The objective of this systematic review and meta-analysis was to compare outcomes from randomised controlled trials (RCTs) utilising QLBs following elective THA.

METHODS

MEDLINE, EMBASE, and Cochrane databases were searched for RCTs perioperative QLBs for THA. Quantitative synthesis was conducted for pain scores, opioid consumption and adverse events.

RESULTS

A total of 7 RCTs with 429 patients undergoing THA were included. No differences in pain scores were demonstrated between QLBs and control interventions. Subgroup analysis demonstrated no differences between QLBs and sham procedures or active comparators. No differences in postoperative opioid consumption between QLB and control interventions was found. In trials reporting adverse events, they were rare and similar between groups. Overall, the certainty of the evidence was graded as low or very low.

CONCLUSIONS

The current literature suggests that a QLB for THA does not reduce pain or opioid consumption compared to sham or active comparators.

Impact of Regional Anesthesia on Subjective Quality of Recovery in Patients Undergoing Thoracic Surgery: A Systematic Review and Meta-Analysis

OBJECTIVES

Regional anesthesia can be effective for managing pain after thoracic surgery. This study evaluated whether it can also improve patient-reported quality of recovery (QoR) after such surgery.

DESIGN

Meta-analysis of randomized controlled trials.

SETTING

Postoperative care.

INTERVENTION

Perioperative regional anesthesia.

PATIENTS

Adults undergoing thoracic surgery.

MEASUREMENTS AND MAIN RESULTS

The primary outcome was total QoR scores 24 hours after surgery. Secondary outcomes were postoperative opioid consumption, pain scores, pulmonary function, respiratory complications, and other adverse effects. Eight studies were identified, of which 6 involving 532 patients receiving video-assisted thoracic surgery were included in the quantitative analysis of QoR. Regional anesthesia significantly improved QoR-40 score (mean difference 9.48; 95% CI 3.53-15.44; I2 = 89%; 4 trials involving 296 patients) and QoR-15 score (mean difference 6.7; 95% CI 2.58-10.82; I2 = 0%; 2 trials involving 236 patients). Regional anesthesia also significantly reduced postoperative opioid consumption and the incidence of nausea and vomiting. Insufficient data were available to meta-analyze the effects of regional anesthesia on postoperative pulmonary function or respiratory complications.

CONCLUSIONS

The available evidence suggests that regional anesthesia can enhance QoR after video-assisted thoracic surgery. Future studies should confirm and extend these findings.

Evaluation of a New Method of Sciatic Nerve Block: A Prospective Pilot Study

Purpose

The location of the sciatic nerve deep within the thigh tissue makes it challenging to locate while the patient is in a supine position. The posterior intermuscular septum of the thigh, which encircles the posterior surface of the adductor magnus muscle (AMM), is where the sciatic nerve is located. Our hypothesis was that administering local anesthetic injections into this area could block the sciatic nerve. Therefore, our aim was to evaluate the effectiveness of sciatic nerve block achieved by injecting local anesthetic into the posterior intermuscular septum of the thigh, named the AMM approach.

Methods

Twenty-six patients undergoing total knee arthroplasty were included in the study. We performed an ultrasound-guided sciatic nerve block by injecting 20 mL of 0.25% ropivacaine into the posterior surface of the adductor magnus muscle, using the AMM approach. Additionally, we administered a femoral nerve block with 20 mL of 0.4% ropivacaine. We assessed the sensory and motor effects of the blockade in the operated lower limb and recorded postoperative pain scores at 0, 4, 8, 12, 24, and 48 hours after the operation.

Results

The AMM approach successfully block the sciatic nerve in all 26 patients. The onset of the sensory and motor blockades was achieved within 5.4 ± 1.9 min and 8.7 ± 3.5 min, respectively. We achieved a satisfactory position with the first puncture in 19 of 26 patients (73.1%). The muscle strength of the tibialis anterior immediately after surgery was 4 (ranging from 2 to 5). Additional rescue analgesics were required in 5 of the 26 patients (19.2%) during the first 24 hours postoperatively.

Conclusion

The AMM approach is an innovative and effective method for sciatic nerve block. When combined with simultaneous femoral nerve block in patients undergoing total knee arthroplasty, it provides a useful analgesic treatment option.

A randomized controlled trial of iliopsoas plane block vs. femoral nerve block for hip arthroplasty

BACKGROUND

Iliopsoas plane block (IPB) is a novel analgesic technique for hip surgery that retains quadriceps strength. However, evidence from randomized controlled trial is remains unavailable. We hypothesized that IPB, as a motor-sparing analgesic technique, could match the femoral nerve block (FNB) in pain management and morphine consumption, providing an advantage for earlier functional training in patients underwent hip arthroplasty.

METHODS

We recruited ninety patients with femoral neck fracture, femoral head necrosis or hip osteoarthritis who were scheduled for unilateral primary hip arthroplasty were recruited and received either IPB or FNB. Primary outcome was the pain score during hip flexion at 4 h after surgery. Secondary outcomes included quadriceps strength and pain scores upon arrival at post anesthesia care unit (PACU) and at 2, 4, 6, 24, 48 h after surgery, the first time out of bed, total opioids consumption, patient satisfaction, and complications.

RESULTS

There was no significant difference in terms of pain score during hip flexion at 4 h after surgery between the IPB group and FNB group. The quadriceps strength of patients receiving IPB was superior to those receiving FNB upon arrival at PACU and at 2, 4, 6 and 24 h after surgery. The IPB group showed a shorter first time out of bed compared to the FNB group. However, there were no significant differences in terms of pain scores within 48 h after surgery, total opioids consumption, patient satisfaction and complications between the two groups.

CONCLUSION

IPB was not superior to FNB in terms of postoperative analgesia for hip arthroplasty. However, IPB could serve as an effective motor-sparing analgesic technique for hip arthroplasty, which would facilitate early recovery and rehabilitation. This makes IPB worth considering as an alternative to FNB.

TRIAL REGISTRATION

The trial was registered prior to patient enrollment at the Chinese Clinical Trial Registry (ChiCTR2200055493; registration date: January 10, 2022; enrollment date: January 18, 2022; https://www.chictr.org.cn/searchprojEN.html ).

Comparison of continuous transmuscular quadratus lumborum block and continuous psoas compartment block for posterior total hip arthroplasty: A randomised controlled trial

Background and Aims

Analgesia for hip surgery involves cutaneous anaesthesia at the site of the skin incision and the anterior hip capsule. This study aimed to compare continuous ultrasound (US)-guided transmuscular quadratus lumborum block (TQLB) with psoas compartment block (PCB) for analgesia in patients undergoing total hip arthroplasty (THA) under general anaesthesia (GA).

Methods

This randomised, observer-blinded trial included 18-70-year-old American Society of Anesthesiologists physical status I-III patients undergoing THA under GA with either US-guided continuous TQLB or PCB. Primary objectives included a visual analogue scale (VAS; 0-100 mm) at rest and mobilisation at 6 h postoperatively (analysed by intention to treat and per protocol) using a non-inferiority margin of 20 mm. Secondary objectives included VAS at other time points, 24-h fentanyl consumption (analysed using the Wilcoxon rank-sum test), sensory dermatomes anaesthetised, motor weakness 30 min after block, and haemodynamic response to skin incision (analysed using the Chi-squared or Fisher's exact test). A P value less than 0.05 was considered statistically significant.

Results

VAS (0-100 mm) score at 6 h on rest was 25.34 ± 14.25 and 27.3 ± 9.6, mean difference (MD) was 1.9 [-3.3, 7.1] and at movement was 35.1 ± 23.0 and 38.6 ± 17.0, MD was 3.5 [-5.2, 12.2], in the PCB (n = 29) and QLB (n = 30) groups, respectively (i.e. less than the non-inferiority margin). However, VAS (rest) at 1, 12, and 24 h postoperatively and median (IQR) 24-h fentanyl consumption was significantly higher in the QLB group (1212.5 [300-2345] μg] when compared to the PCB group (635 [100-1645] μg; P = 0.0004).

Conclusion

Though statistically, continuous QLB was non-inferior to continuous PCB for pain at rest and mobilisation at 6-hours postoperatively, a higher 24-hour perioperative fentanyl consumption and VAS show that QLB was clinically inferior to PCB.

Analgesic benefits of the quadratus lumborum block in total hip arthroplasty: a systematic review and meta-analysis

The quadratus lumborum block (QLB) is reported to reduce pain and improve function following total hip arthroplasty; however, randomised controlled trials evaluating the benefits of adding this block to general or spinal anaesthesia in this population are conflicting. We performed a systematic review seeking randomised controlled trials investigating QLB benefits for total hip arthroplasty, stratifying comparisons regarding the addition of QLB to either general or spinal anaesthesia. The primary outcome was 24-h area under the curve (AUC) pain score. Pain scores were interpreted in the context of a population-specific minimal clinically important difference of 1.86 cm on a 10-cm visual analogue scale, or an AUC pain score of 5.58 cm.h. Secondary outcomes included analgesic consumption, functional recovery and opioid-related side-effects. In all, 18 trials (1318 patients) were included. Adding QLB to general or spinal anaesthesia improved 24-h AUC rest pain scores by a mean difference (95%CI) of -3.56 cm.h (-6.70 to -0.42; p = 0.034) and - 4.19 cm.h (-7.20 to -1.18; p = 0.014), respectively. These improvements failed to reach the pre-determined minimal clinically important difference, as did the reduction in analgesic consumption. Quadratus lumborum block improved functional recovery for general, but not spinal, anaesthesia. Opioid-related side-effects were reduced with QLB regardless of anaesthetic modality. Low-to-moderate quality evidence suggests that the extent to which adding QLB to either general or spinal anaesthesia reduces postoperative pain and opioid consumption after total hip arthroplasty is statistically significant but may be clinically unimportant for most patients. However, adding QLB to general anaesthesia might enhance functional recovery. Taken together, our findings do not support the routine use of QLB as part of multimodal analgesic regimens for total hip arthroplasty.

The Analgesic Efficacy of Ultrasound-guided Quadratus Lumborum Block (via transmuscular or posterior approach) After Hip Surgery: A Systematic Review and Meta-analysis with Trial Sequential Analysis

BACKGROUND

No review or meta-analysis exists elucidate the efficacy and safety of quadratus lumborum block (QLB) on the pain intensity, opioid requirement, and mobilization in patients undergoing hip surgery. This systematic review and meta-analysis of randomized controlled trials was designed to compare QLB with no block or placebo (without other nerve/plexus blocks) for patients undergoing hip surgery.

METHODS

Two individual researchers conducted the platform searches on the PubMed, Cochrane Library, and Embase databases from inception to 12 June 2021. Only English publications were included. The rest pain score at 12 postoperative hours was designated as the primary outcome. Secondary outcomes included rest pain score at 6 and 24 postoperative hours, dynamic pain score at 6, 12, and 24 postoperative hours, total opioid consumption, postoperative nausea and vomiting, and patient satisfaction.

RESULTS

Seven trials including 514 patients were included. When compared with controls, the QLB technique significantly reduced rest pain scores at 12 hours after surgery (mean difference -1.15, -1.52 to -0.77, P<0.0001). The secondary outcomes were limited by heterogeneity: secondary pain outcomes and opioid consumption were consistently improved with QLB (P<0.05); patient satisfaction and postoperative nausea and vomiting were similar between the groups based on the Inverse variance heterogeneity model (P>0.05). The overall quality of evidence was moderate.

CONCLUSIONS

There is moderate evidence that QLB employment in hip surgery produces significant reduction in pain scores and opioid consumption within 24 hours. QLB appears to be an appropriate option for postoperative analgesia after hip surgery.

Comparison Between Ultrasound-Guided Suprainguinal Fascia Iliaca Block and Anterior Quadratus Lumborum Block for Total Hip Arthroplasty: A Prospective, Double-Blind, Randomized Controlled Trial

BACKGROUND

Nerve block is a key technique in postoperative analgesia for total hip arthroplasty (THA). This study aimed to compare ultrasound-guided suprainguinal fascia iliaca block (SFIB) and anterior quadratus lumborum block (AQLB) in patients undergoing primary THA.

METHODS

In this prospective, double-blind, randomized controlled trial, 100 patients undergoing primary THA under general anesthesia were randomly allocated to receive an ultrasound-guided SFIB + sham AQLB (SFIB group), or an ultrasound-guided AQLB + sham SFIB (AQLB group). Before wound suture, all patients received periarticular infiltration analgesia which the local anesthetic was injected into joint capsule, exposed gluteal and abductor muscles, peritrochanteric zone, and subcutaneous tissue under the incision as multiple sites. The primary outcome was postoperative morphine consumption within 24 hours after surgery. Secondary outcomes were the time to first rescue analgesia, postoperative pain assessed on the visual analog scale, postoperative quadriceps strength, the time to hospital discharge, and the incidence of postoperative complications.

RESULTS

There were no significant differences between the 2 groups concerning morphine consumption within 24 hours after surgery (P = .774), the time to first rescue analgesia (P = .890), the time to hospital discharge (P = .532), and the incidence of postoperative complications (P > .05). The visual analog scale pain scores at rest and during motion also were similar at all time points (P > .05). Significantly more patients in the SFIB group experienced quadriceps muscle weakness at 2 hours (P = .008) and 6 hours (P = .009) after surgery.

CONCLUSION

Under the circumstances of this study, when combined with periarticular infiltration analgesia, the SFIB provided similar pain relief compared with AQLB in patients undergoing THA, but was associated with muscle weakness within 6 hours after surgery.

Evaluation of Sensory Loss Obtained by Circum-Psoas Blocks in Patients Undergoing Total Hip Replacement: A Descriptive Pilot Study

Purpose

Methods

Results

Conclusion

Clinical Trial Registration

Quadratus Lumborum Block Reduces Postoperative Pain Scores and Opioids Consumption in Total Hip Arthroplasty: A Meta-Analysis

Quadratus lumborum block (QL) is a relatively new regional anesthesia technique that has been used in different surgeries for improved outcomes. There are few case reports and studies about its role in total hip arthroplasty with variable effects. This study aimed to evaluate the effect of QL block on postoperative pain control, opioid consumption, and the incidence of postoperative adverse events in total hip arthroplasty surgeries.

A systematic review of the scientific literature addressing the use of QL block in hip arthroplasty was performed following the PRISMA guidelines and using the online database databases, Medline and Science Direct. We registered this review with the PROSPERO database in May 2021 (reference number-CRD42021247055). Two authors performed the literature searches in June 2021 and repeated them in July 2021 to ensure accuracy. Review Manager software (RevMan for Mac, version 5.4; Cochrane Collaboration, Oxford, United Kingdom) was used to perform a meta-analysis of studies included in our review. Five randomized controlled trials were identified for inclusion (n=394) in our meta-analysis.

The results demonstrated a beneficial effect of QL block in pain control at 6, 12, and 24 hours postoperatively after hip arthroplasty (p <0.05). Opioid consumption for 24 hours was significantly reduced in the QL group (p=0.010). Our study also demonstrated that QL block is associated with a significant reduction in postoperative nausea and vomiting (PONV) (p=0.04). In conclusion, QL block can provide significantly better pain control after total hip arthroplasty at 6, 12, and 24 hours postoperatively. It also results in significantly reduced 24 hour-opioid consumption. This block is also associated with a lesser incidence of PONV and a better satisfaction level postoperatively.

A systematic review and meta-analysis of efficacy of ultrasound-guided single-shot quadratus lumborum block for postoperative analgesia in adults following total hip arthroplasty

STUDY OBJECTIVE

To evaluate the efficacy of ultrasound-guided single-shot quadratus lumborum block (QLB) for postoperative analgesia in adults following total hip arthroplasty (THA).

DESIGN

Systematic review and meta-analysis.

SETTING

Perioperative period.

PATIENTS

Adult patients undergoing THA.

METHODS

Studies were identified by performing electronic searches in the following electronic databases, PubMed (Medline), Cochrane Central Registry of Trials (CENTRAL), and Google Scholar. We sought studies in adult patients undergoing THA, comparing QLB with a control group (no block, sham block or any other ultrasound guided regional nerve blocks). A total of 774 patients from 10 studies (7 randomized controlled, one controlled clinical and two retrospective study) were included in this meta-analysis.

MAIN RESULTS

The 24 hr opioid consumption was similar in both the groups [WMD -4.09; 95%CI (-9.00, 0.83); P = 0.10; I2 = 95%]. The pain scores at rest at 24 hr was significantly less in QLB group [WMD -0.62; 95% CI (-1.15, -0.10); P = 0.02; I2 = 75%].The difference in pain scores was not clinically significant. The pain scores on movement at 24 hours, time to first analgesic request and time to discharge from hospital were similar in both the groups.

CONCLUSIONS

QLB as part of multimodal analgesia did not result in any significant analgesic benefits in patients undergoing hip arthroplasty in terms of either postoperative opioid consumption or pain scores at rest and on movement. Overall, the level of certainty is low. Further, well-designed trials are required to verify the results.

PROSPERO REGISTRATION NO

CRD42021253425.

Efficacy of quadratus lumborum block for analgesia in adult participants undergoing hip surgery: A meta-analysis of randomized controlled trials

STUDY OBJECTIVE

This study aimed to identify the benefits of quadratus lumborum block (QLB) in terms of postoperative analgesic effects in adult participants undergoing hip surgery.

DESIGN

Meta-analysis of randomized controlled trials.

SETTING

Previous randomized controlled trials that evaluated the analgesic effect of QLB compared to that of no block.

PATIENTS

Nine studies including 616 participants.

INTERVENTIONS

Participants in the treatment group received QLB, whereas those in the control group received no block.

MEASUREMENTS

Outcomes were postoperative 24-h opioid consumption (primary), 12-h/24-h visual analog scale (VAS) or numeric rating scale (NRS) pain scores, postoperative nausea and vomiting (PONV), and satisfaction. The effect size was estimated using the standardized mean difference (SMD), mean difference (MD), or risk ratio (RR) with a 95% confidence interval (CI). We used the risk of bias tool (RoB 2) to assess the risk of bias of the included studies and the GRADE approach to determine the level of certainty of the evidence.

MAIN RESULTS

Compared to no block, the QLB group has less opioid consumption (SMD -1.69, 95% CI -2.54 to -0.84; low level of certainty of the evidence). Estimated MD for morphine consumption was 24 mg. The QLB group had a lower 12-h VAS/NRS pain score (MD -1.16, 95% CI -1.82 to -0.51; moderate level of certainty of the evidence) and 24-h VAS/NRS pain score (MD -0.92, 95% CI -1.42 to -0.43; moderate level of certainty of the evidence). QLB decreased the incidence of PONV (RR 0.43, 95% CI 0.24 to 0.79; moderate level of certainty of the evidence) and increased participants' satisfaction (SMD 1.15, 95% CI 0.63 to 1.67; moderate level of certainty of the evidence). Estimated MD for satisfaction was 1.74 points of Likert scale. There were no significant adverse events associated with the QLB in any of the included trials.

CONCLUSION

Our meta-analysis showed that QLB when compared to no block clinically decreased opioid requirements, reduced PONV, and improved participants' satisfaction. QLB also seems to be significantly superior to no block in terms of pain score, but its clinical importance remains unclear.