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SYSTEMATIC REVIEW article

Front. Surg., 04 August 2021
Sec. Visceral Surgery
This article is part of the Research Topic Pain Management in Abdominal Surgery View all 8 articles

A Meta-Analysis of Randomized Controlled Trials Concerning the Efficacy of Transversus Abdominis Plane Block for Pain Control After Laparoscopic Cholecystectomy

\nWeihua WangWeihua Wang1Lishan WangLishan Wang2Yan Gao
Yan Gao1*
  • 1Department of Thoracic Surgery, Weifang Second People's Hospital, Weifang, China
  • 2Department of Oral and Maxillofacial Surgery, Weifang Second People's Hospital, Weifang, China

Background and Purpose: Transverse abdominis plane (TAP) block has been suggested to reduce post-operative pain after laparoscopic cholecystectomy (LC). However, the literature is divided on whether ultrasound (USG)-guided TAP block is effective for pain control after LC. The present meta-analysis therefore evaluated the efficacy of USG-guided TAP block vs. controls and port site infiltration for pain control after LC.

Methods: A comprehensive literature search of online academic databases was performed for published randomized controlled trials (RCTs) for studies published to January 31, 2021. The primary outcome analyzed was post-operative pain score at 0, 6, 12, and 24 h post-surgery, both during rest and while coughing. Secondary outcomes included morphine consumption and post-operative nausea and vomiting (PONV) incidence.

Results: A total of 23 studies with data on 1,450 LC patients were included in our meta-analysis. A reduction in pain intensity at certain post-operative timepoints was observed for USG-guided TAP block patients compared to control group patients. No reduction in pain intensity was observed for patients receiving USG-guided TAP block patients vs. conventional Port site infiltration.

Conclusion: This meta-analysis concludes that TAP block is more effective than a conventional pain control, but not significatively different from another local incisional pain control that is port site infiltration. Additional prospective randomized controlled trials are required to further validate our findings.

Introduction

Laparoscopic cholecystectomy (LC) is currently the gold standard treatment for symptomatic gall bladder disorders, including cholelithiasis and cholecystitis (1, 2). However, LC, while minimally invasive, is associated with post-operative pain, especially within the first 24 h. This pain is routinely managed using opiates, which are associated with a number of side effects, including excessive sedation and post-operative nausea and vomiting (PONV). As these side effects may increase hospital stay durations, proper pain control and management are therefore critical for improving clinical outcomes and promoting earlier ambulation post-surgery (35).

Transversus abdominis plane (TAP) block is a regional anesthetic technique that has gradually become an alternative for post-operative pain control. It involves the infusion of local anesthetic into the fascial plane of the abdominal wall where the T6 to L1 nerves are found (5). Conventionally, TAP block was performed using anatomical landmarks, but ultrasound (USG)-guided TAP block has become more popular in recent years (610).

A previously published meta-analysis detailing seven randomized controlled trials (RCTs) showed TAP block to be effective when compared with standard analgesia in adults undergoing LC (11). However, they lacked evidence to compare the efficacy of TAP block against conventional port site infiltration for post-LC pain control. The current study aims to systematically review all available RCTs to evaluate the efficacy of USG-guided TAP block against conventional analgesia and port site infiltration in LC patients.

Materials and Methods

Search Strategy

This meta-analysis was performed using Preferred Reporting Items for Systematic Reviews and Meta-analysis (PRISMA) guidelines (12). A comprehensive literature search for RCTs published prior to January 31, 2021 was conducted using the following electronic databases: PubMed, Google scholar, Cochrane Library, Scopus, and TRIP. The following search terms were employed: “Transabdominal abdominis plane block” OR “Tap block” OR “Plane Block” OR “Ultrasound guided TAP block” AND “Laparoscopic cholecystectomy” AND “Pain Control” AND “Analgesic” OR “Local Anesthesia” OR “Infiltration anesthesia.” Literature cited by included studies were also manually searched for additional eligible studies. The literature search did not restrict for language.

Study Eligibility Criteria

RCTs involving adult patients undergoing elective LC that compared the efficacy of USG-guided TAP block against either control or port-site infiltration groups were included. Studies that did not report pain outcomes were not included. Studies where full-texts were not available were not included.

Data Collection and Analysis

All eligible studies were screened by two independent reviewers using the selection criteria listed above. Screening first entailed abstract review, followed by full-text review. Any discrepancies were settled through discussion with a third reviewer. Articles published in a language other than English were machine translated using Google Translate and considered for inclusion. The following information was extracted from each included study: number of patients, investigation groups, types of analgesia used, outcome measurements, treatments, interventions, and adverse effects.

Primary Outcome

The primary outcome evaluated in this study was pain control in LC patients, as measured using 1–10 rating scales such as the visual analog scale (VAS) or numerical rating scale (NRS). Measurements at 0, 6, 12, and 24 h post-operation, both at rest and while coughing, were noted.

Secondary Outcomes

Secondary outcomes in this study included morphine consumption and post-operative nausea and vomiting (PONV) incidence.

Quality Assessment

Studies were assessed for quality using a modified JADAD score (13) that evaluated study methods, randomization approaches, blinding, withdrawals and dropouts, inclusion and exclusion criteria, approaches used to assess adverse effects, and statistical analysis. Scores ranged from 0 (lowest quality) to 8 (highest quality). Study quality was assessed independently by two reviewers. All discrepancies were resolved through discussion.

Publication Bias

Publication bias was assessed using funnel plot analysis. Funnel plot asymmetry was assessed using Egger's regression test (14, 15).

Statistical Analysis

Mean difference (MDs) with 95% confidence intervals (CIs) was calculated for the continuous outcome. Risk ratios (RR) with 95% CIs were calculated for categorical outcomes to estimate pooled findings. Study heterogeneity was evaluated using the I2 statistic. For I2 values >50%, a random-effects model was applied. For I2 values below 50%, a fixed-effect model was applied. Statistical analyses were conducted using Review Manager software (Version 5.3, Copenhagen: The Nordic Cochrane Center, The Cochrane Collaboration 2014).

Results

Literature Search

Primary screening yielded 118 candidate articles. Of these, 47 underwent full-text screening and review. Ultimately, 23 studies containing data on 1,450 patients met inclusion criteria (Figure 1).

FIGURE 1
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Figure 1. Flow diagram for the selection of studies and specific reasons for exclusion from the present meta-analysis.

Characteristics of Included Studies

A full summary of extracted data from included studies is presented in Table 1. Included studies were published between 2009 and 2020, with individual study samples ranging from 40 to 120 individuals. All included studies were of moderate or high quality based on JADAD Score (Table 2). Out of 23 included studies, 14 studies (1618, 2325, 27, 30, 31, 3438, 40) were conducted in Caucasian individuals, with the remaining nine studies (1922, 26, 28, 29, 32, 33) were conducted on an Asian population.

TABLE 1
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Table 1. Baseline and clinical characteristic of the included studies in the meta-analysis for the efficacy of transversus abdominis plane block for pain control after laparoscopic cholecystectomy.

TABLE 2
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Table 2. Quality assessment using modified Jadad scores (Points 1–8) for the included studies in the meta-analysis.

For the primary outcome of pain control at rest and during coughing, out of 23 studies, 22 studies were included in the analysis for which references have been provided in Table 3. Some of the included studies had reported data only for one or two timepoints for post-operative pain score either for 0 or 6 or 12 or 24 h at rest or during coughing (17, 18, 20, 2224, 26, 28, 30, 3638). A single study by El-Dawlatly et al. (27) only provided the data for morphine consumption. PONV data was available for 12 studies (16, 18, 19, 21, 23, 25, 28, 29, 31, 33, 36, 37) (750 LC patients). Information on morphine consumption up to 24 h post-operation was reported by seven studies (16, 17, 23, 2729, 31) (348 LC subjects).

TABLE 3
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Table 3. Summary of findings for the included studies investigating the efficacy of TAP block for pain control after LC.

Clinical Outcomes

Post-operative Pain Intensity at Rest

Analysis of the included studies suggested significantly reduced pain intensity in patients receiving USG-guided TAP block relative to control group patients at 0, 6, 12, and 24 h post-operation (Figures 2A–D). However, no such reduction was noted when USG-guided TAP block patients were compared to Port site infiltration group patients (Table 3). A high degree of heterogeneity was present in all included studies at all timepoints (0 h: I2 = 98%, p < 0.0001; 6 h: I2 = 94%, p < 0.0001; 12 h: I2 = 85%, p < 0.0001; 24 h: I2 = 87%, p < 0.0001).

FIGURE 2
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Figure 2. (A–D) Forest plot representing for Pain Intensity at Rest for USG guided TAP block vs. control group at (A) 0 h; (B) 6 h; (C) 12 h and (D) 24 h timepoints after operation.

Post-operative Pain Intensity While Coughing

A significant reduction in pain intensity while coughing was observed at 0, 6, and 24 h post-operation in USG-guided TAP block patients relative to control group patients (Figures 3A–D). No significant change in pain intensity was noted at 12 h post-operation. No significant changes were noted when comparing USG-guided TAP block patients to Port site infiltration group patients at all post-operative time-point (Table 3).

FIGURE 3
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Figure 3. (A–D) Forest plot representing for Pain Intensity after operation during coughing for USG TAP block vs. control group (A) 0 h; (B) 6 h; (C) 12 h and (D) 24 h.

Morphine Consumption During 24 h After Operation

Analysis of seven studies (16, 17, 23, 2729, 31) involving 348 LC subjects showed a significant reduction in morphine consumption during the first 24 h after surgery (MD = −1.76 mg, 95% CI: −3.28 to −0.24) in patients receiving TAP blocks compared to control subjects (Figure 4). A high degree of heterogeneity was observed (I2 = 91%, p < 0.0001).

FIGURE 4
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Figure 4. Forest plot representing for morphine consumption in the recovery room USG guided TAP block vs. control group.

Post-operative Nausea and Vomiting (PONV) Incidence

Analysis of 12 studies (16, 18, 19, 21, 23, 25, 28, 29, 31, 33, 36, 37) involving 750 LC subjects showed a decreased incidence of PONV in patients receiving USG guided TAP blocks compared to control subjects (RR = 0.69, 95% CI: 0.54–0.89) (Figure 5). No significant heterogeneity between the studies was observed (I2 = 9%, p = 0.36).

FIGURE 5
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Figure 5. Forest plot representing for adverse events (PONV) in USG guided TAP block vs. control group.

Publication Bias

No significant publication bias was detected using Funnel plots or Egger's tests for (a) Post-Operative Pain Intensity at Rest for all timepoints (0 h: p = 0.54; 6 h: p = 0.32; 12 h: p = 0.98; 24 h: p = 0.63); (b) Post-Operative Pain Intensity during coughing for all timepoints (0 h: p = 0.12; 6 h: p = 0.76; 12 h; p = 0.91, 24 h: p = 0.17), (c) Morphine consumption during 24 h after operation (p = 0.36), (d) Post-operative nausea and vomiting (PONV) incidence (p = 0.71). All funnel plots showed symmetric shape for all the comparison.

Discussion

This study evaluated the efficacy of USG guided TAP block for reducing pain intensity at rest and while coughing in LC patients for up to 24 h post-operation. We noted a significant reduction in pain intensity in patients who received USG-guided TAP block relative to control group patients, as well as reduced morphine consumption and incidence of PONV. However, no such reduction was noted when USG-guided TAP block patients were compared to Port site infiltration group patients at rest and during coughing at all post-operative timepoints upto 24 h.

Severe pain for LC patients generally occurs during the first 24 h post-surgery, and is thought to arise mainly from visceral tissue damage and the surgical incision (with the latter taking precedent) (41). As such, analgesic planning must focus on incisional pain rather than visceral pain. The absence of significant difference of pain control after port site infiltration advocates too for an incisional pain control. Our results showed that USG-guided TAP block led to significantly reduced post-operative pain, as well as reduced morphine consumption and PONV incidence. These findings concur with a previous analysis of seven studies by Peng et al. (11). Recent RCTs have suggested that USG-guided TAP block plays an important role in multimodal pain therapy through proper visualization and improved accuracy. However, few studies have compared the effects of subcoastal TAP block with those of posterior TAP block. As such, our meta-analysis included RCTs that looked at both USG-guided TAP blocks and oblique subcostal TAP blocks. Nonetheless, we noted high heterogeneity between studies, suggesting that our meta-analysis results need to be treated with caution.

Our study has several limitations: (1) included studies had relatively small sample sizes; (2) extended follow-up data on chronic pain, long-term analgesic use, and adverse events was lacking; (3) multiple pain score scales were used; (4) a diverse range of anesthesia dosages were administered across the studies, and (5) insufficient study numbers for important factors such as laproscopic guided TAP block and fentanyl, tramadol, and opioid consumption, thereby precluding subgroup analysis.

Conclusion

This meta-analysis concludes that TAP block is more effective than a conventional pain control, but not significatively different from another local incisional pain control that is port site infiltration. Additional prospective randomized controlled trials are required to further validate our findings.

Data Availability Statement

The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.

Author Contributions

WW conceived and designed the study. WW and LW did literature search and analyzed the data. YG wrote the paper, reviewed, and edited the manuscript. All authors have read and approved the final manuscript.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher's Note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: laparoscopic cholecystectomy, analgesia, transverse abdominis plane block, ultrasound, pain control

Citation: Wang W, Wang L and Gao Y (2021) A Meta-Analysis of Randomized Controlled Trials Concerning the Efficacy of Transversus Abdominis Plane Block for Pain Control After Laparoscopic Cholecystectomy. Front. Surg. 8:700318. doi: 10.3389/fsurg.2021.700318

Received: 26 April 2021; Accepted: 08 July 2021;
Published: 04 August 2021.

Edited by:

Stefano Pontone, Sapienza University of Rome, Italy

Reviewed by:

Claude Bertrand, CHU UCL Namur Site Godinne, Belgium
Kenan Yusif-zade, Independent Researcher, Baku, Azerbaijan

Copyright © 2021 Wang, Wang and Gao. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Yan Gao, bTE1MTY1NjAzNDU2JiN4MDAwNDA7MTYzLmNvbQ==

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.