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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Med.</journal-id>
<journal-title>Frontiers in Medicine</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Med.</abbrev-journal-title>
<issn pub-type="epub">2296-858X</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fmed.2025.1595778</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Medicine</subject>
<subj-group>
<subject>Systematic Review</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Comparison of the efficiency of ultrasound-guided ESPB and TAPB on postoperative analgesia: a system review and meta-analysis</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name><surname>Qian</surname> <given-names>Lu</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
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<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
</contrib>
<contrib contrib-type="author">
<name><surname>Hu</surname> <given-names>Nian-qiang</given-names></name>
<xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
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<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
</contrib>
<contrib contrib-type="author">
<name><surname>Shen</surname> <given-names>Qi-hong</given-names></name>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<uri xlink:href="https://loop.frontiersin.org/people/1175118/overview"/>
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<contrib contrib-type="author" corresp="yes">
<name><surname>Ni</surname> <given-names>Kai</given-names></name>
<xref ref-type="aff" rid="aff3"><sup>3</sup></xref>
<xref ref-type="corresp" rid="c001"><sup>&#x002A;</sup></xref>
<uri xlink:href="https://loop.frontiersin.org/people/3008444/overview"/>
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<aff id="aff1"><sup>1</sup><institution>Department of Anesthesiology, Sir Run Run Shaw Hospital, Affiliated with the Zhejiang University School of Medicine</institution>, <addr-line>Hangzhou</addr-line>, <country>China</country></aff>
<aff id="aff2"><sup>2</sup><institution>Department of Anesthesiology, Affiliated Hospital of Jiaxing University</institution>, <addr-line>Jiaxing</addr-line>, <country>China</country></aff>
<aff id="aff3"><sup>3</sup><institution>Department of Anesthesiology, Shulan (Hangzhou) Hospital, Shulan International Medical College, Zhejiang Shuren University</institution>, <addr-line>Hangzhou</addr-line>, <country>China</country></aff>
<author-notes>
<fn id="fn0001" fn-type="edited-by"><p>Edited by: Domenico Pietro Santonastaso, Maurizio Bufalini Hospital, Italy</p></fn>
<fn id="fn0002" fn-type="edited-by"><p>Reviewed by: Annabella De Chiara, Azienda Unit&#x00E0; Sanitaria Locale (AUSL) della Romagna, Italy</p>
<p>Gabriele Melegari, University Hospital of Modena, Italy</p>
<p>Giorgio Ranieri, Ospedale Isola Tiberina - Gemelli Isola, Italy</p></fn>
<corresp id="c001">&#x002A;Correspondence: Kai Ni, <email>jkis_stone@sohu.com</email></corresp>
</author-notes>
<pub-date pub-type="epub">
<day>26</day>
<month>05</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="collection">
<year>2025</year>
</pub-date>
<volume>12</volume>
<elocation-id>1595778</elocation-id>
<history>
<date date-type="received">
<day>18</day>
<month>03</month>
<year>2025</year>
</date>
<date date-type="accepted">
<day>08</day>
<month>05</month>
<year>2025</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#x00A9; 2025 Qian, Hu, Shen and Ni.</copyright-statement>
<copyright-year>2025</copyright-year>
<copyright-holder>Qian, Hu, Shen and Ni</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>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.</p>
</license>
</permissions>
<abstract>
<sec id="sec1">
<title>Background</title>
<p>This meta-analysis systematically evaluates the analgesic efficacy of two regional anesthesia techniques - transversus abdominis plane block (TAPB) and erector spinae plane block (ESPB) in abdominal surgical procedures.</p>
</sec>
<sec id="sec2">
<title>Methods</title>
<p>This PRISMA-compliant meta-analysis systematically queried PubMed, Embase, Web of science, and Cochrane library. Eligible studies were controlled clinical trials comparing ESPB and TAPB for postoperative analgesia, documenting pain scales, opioid use, and safety outcomes. Methodological rigor was evaluated per Cochrane criteria, with quantitative synthesis conducted via RevMan 5.4 using effect magnitudes (SMD/MD) and risk ratios (RR). Evidence certainty was graded using GRADE methodology.</p>
</sec>
<sec id="sec3">
<title>Result</title>
<p>Pooled data from 21 RCTs (<italic>n</italic>&#x202F;=&#x202F;1,293 patients) revealed better pain control during the 24-h postoperative period in the ESPB groups (2-h: MD&#x202F;=&#x202F;&#x2212;0.68, 95% CI [&#x2212;1.04, &#x2212;0.32], <italic>p</italic>&#x202F;&#x003C;&#x202F;0.05). Also, postoperative opioid consumption was significantly reduced in the ESPB group (MD&#x202F;=&#x202F;&#x2212;1.25; 95% CI [&#x2212;1.66 to &#x2212;0.85]; <italic>p</italic>&#x202F;&#x003C;&#x202F;0.05). No significant differences were observed in complication occurrence (RR&#x202F;=&#x202F;1.13, 95% CI [0.75, 1.71], <italic>p</italic>&#x202F;&#x003E;&#x202F;0.05).</p>
</sec>
<sec id="sec4">
<title>Conclusion</title>
<p>Current evidence indicates that ESPB demonstrates superior postoperative analgesic efficacy and reduced opioid requirements compared to TAPB, while maintaining comparable safety profiles.</p>
</sec>
<sec id="sec201">
<title>Systematic review registration</title>
<p><uri xlink:href="https://www.crd.york.ac.uk/PROSPERO/view/CRD42021275992">https://www.crd.york.ac.uk/PROSPERO/view/CRD42021275992</uri>.</p>
</sec>
</abstract>
<kwd-group>
<kwd>transversus abdominis plane block</kwd>
<kwd>erector spinae plane block</kwd>
<kwd>meta-analysis</kwd>
<kwd>ESPB</kwd>
<kwd>TAPB</kwd>
</kwd-group>
<counts>
<fig-count count="8"/>
<table-count count="2"/>
<equation-count count="0"/>
<ref-count count="40"/>
<page-count count="11"/>
<word-count count="5020"/>
</counts>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Intensive Care Medicine and Anesthesiology</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec sec-type="intro" id="sec5">
<title>Introduction</title>
<p>Abdominal surgical procedures constitute a cornerstone of global surgical practice, with epidemiologic reports indicating a steadily escalating procedure volume accounting for 20&#x2013;35% of all operative interventions annually (<xref ref-type="bibr" rid="ref1">1</xref>). Contemporary surgical approaches, ranging from minimally invasive laparoscopy to conventional laparotomy, continue to confront substantial postoperative nociceptive burden. Previous studies documented 38&#x2013;42% incidence of moderate-to-severe acute postsurgical pain (Visual Analog Scale &#x2265;4) within 48&#x202F;h post-procedure (<xref ref-type="bibr" rid="ref2">2</xref>), a critical clinical determinant associated with functional recovery impairment (<xref ref-type="bibr" rid="ref3">3</xref>) and elevated 30-day complication risks (<xref ref-type="bibr" rid="ref4">4</xref>).</p>
<p>While neuraxial analgesia maintains its status as the reference standard for abdominal pain management (<xref ref-type="bibr" rid="ref5">5</xref>), technical constraints (e.g., anticoagulation contraindications, anatomical complexity) limit its universal applicability. The advent of fascial plane blocks has revolutionized regional anesthesia paradigms since the seminal description of transversus abdominis plane block (TAPB) by Rafi in 2001 (<xref ref-type="bibr" rid="ref6">6</xref>). This ultrasound-guided interfascial technique deposits local anesthetic between the transversus abdominis and internal oblique muscle layers, achieving somatic analgesia through blockade of thoracolumbar nerve branches (T6-L1) (<xref ref-type="bibr" rid="ref7">7</xref>). Nevertheless, its inherent anatomical confinement precludes visceral nociception modulation-a critical limitation given that visceral afferents mediate 68% of post-laparotomy pain components. Erector spinae plane block (ESPB), first conceptualized in 2016 for chronic thoracic pain management (<xref ref-type="bibr" rid="ref8">8</xref>), has emerged as a versatile truncal analgesia modality. Clinical series have validated its efficacy across diverse surgical contexts, from thoracic to pelvic procedures (<xref ref-type="bibr" rid="ref9">9</xref>&#x2013;<xref ref-type="bibr" rid="ref11">11</xref>). Recent meta-analyses comparing ESPB and TAPB present conflicting conclusions: Matthew et al. demonstrated ESPB&#x2019;s superiority in opioid-sparing effects (<xref ref-type="bibr" rid="ref12">12</xref>), whereas Lin&#x2019;s analysis found ESPB does not provide better clinical analgesia than the TAPB (<xref ref-type="bibr" rid="ref13">13</xref>). Furthermore, the above meta-analyses had sample sizes.</p>
<p>Thus, the purpose of this review is to compare the efficacy of the ESPB with the TAPB in patients undergoing abdominal surgeries.</p>
</sec>
<sec sec-type="methods" id="sec6">
<title>Methods</title>
<sec id="sec7">
<title>Study design and registration</title>
<p>Conducted per PRISMA 2020 guidelines, this pre-registered meta-analysis (PROSPERO CRD42021275992) adhered to systematic review standards.</p>
</sec>
<sec id="sec8">
<title>Information sources and search strategy</title>
<p>A systematic multistage search algorithm was executed across four electronic databases: PubMed, Embase, Cochrane library, and Web of science. The search chronology spanned from database inception to October 31, 2024, with no linguistic or publication status restrictions. The optimized Boolean syntax incorporated: MeSH terms: <italic>&#x201C;NerveBlock&#x201D; [Mesh]</italic>, <italic>&#x201C;Analgesia&#x201D; [Mesh];</italic> Free-text permutations: <italic>(erector spinae OR ESP) AND (plane block OR fascial block)</italic>, <italic>(transversus abdominis OR TAP) AND (regional anesthesia OR nerve block)</italic>; Procedure-specific filters: (<italic>&#x201C;abdominal surgery&#x201D; [tiab] OR laparotom</italic> [tiab] OR colectom&#x002A;[tiab])&#x002A;. An exemplar PubMed search strategy is detailed in <xref ref-type="sec" rid="sec37">Supplementary Data</xref>. Snowball searching was performed on included studies&#x2019; reference lists, supplemented by contact with corresponding authors for unpublished datasets.</p>
</sec>
<sec id="sec9">
<title>Study selection criteria</title>
<p>The inclusion criteria were formulated according to PICOS framework with the following operational definitions: Population (P): Patients &#x2265;18&#x202F;years undergoing elective procedures under general anesthesia; Intervention (I): Ultrasound-guided ESPB; Comparator (C): Ultrasound-guided TAPB; Outcomes (O): <italic>Primary</italic>: Pain score at 2-h postoperative; <italic>Secondary</italic>: Pain scores at 4&#x202F;h, 6&#x202F;h, 8&#x202F;h, 12&#x202F;h, and 24&#x202F;h during postoperative period; intraoperative opioid consumption; incidence of procedure-related complications (vascular puncture, local anesthetic systemic toxicity), and postoperative nausea and vomiting (PONV); Study design (S): Parallel-group RCTs with &#x2265;20 participants per arm. Exclusion criteria comprised: (1) Non-randomized designs (case series, editorials, narrative reviews); (2) Conference abstracts without peer-reviewed full texts; (3) Ongoing trials without primary outcome data; (4) Combined regional techniques (e.g., ESPB with paravertebral block).</p>
</sec>
<sec id="sec10">
<title>Data extraction protocol</title>
<p>Two researchers independently managed study selection: initial deduplication using EndNote; title/abstract screening for relevance; full-text review against inclusion criteria. Data extraction included: study characteristics (author, year, sample size); surgical/anesthesia details; complication rates (nerve block effects, and PONV). Discrepancies were resolved through consensus discussions.</p>
</sec>
<sec id="sec11">
<title>Risk of bias and evidence quality assessment</title>
<p>The Cochrane Review Manager (version 5.3) was employed to assess potential study biases. Two independent reviewers appraised trials based on:</p>
<list list-type="bullet">
<list-item><p>Selective outcome reporting</p></list-item>
<list-item><p>Incomplete outcome data</p></list-item>
<list-item><p>Evaluator/participant blinding status</p></list-item>
<list-item><p>Allocation concealment methods</p></list-item>
<list-item><p>Random sequence generation</p></list-item>
<list-item><p>Other potential biases</p></list-item>
</list>
<p>The GRADE framework evaluated evidence certainty through six domains: study design, risk of bias, imprecision, inconsistency, indirectness, and other considerations. Evidence quality was stratified into four levels: very low, low, moderate, or high.</p>
</sec>
<sec id="sec12">
<title>Statistical analysis</title>
<p>Quantitative synthesis was performed using Review Manager 5.3. For dichotomous variables, pooled effects were expressed as risk ratios (RR) with 95% CIs. Continuous outcomes were analyzed through standardized mean differences (SMDs) or weighted mean differences (MDs), accompanied by 95% CIs. When studies reported continuous variables as medians with interquartile or min-max ranges, these values were converted to parametric measures using established transformation algorithms (<xref ref-type="bibr" rid="ref14">14</xref>, <xref ref-type="bibr" rid="ref15">15</xref>).</p>
<p>The predefined statistical significance threshold was set at <italic>&#x03B1;</italic>&#x202F;=&#x202F;0.05. Between-study heterogeneity was quantified using <italic>I</italic><sup>2</sup> statistics, with values exceeding 50% denoting substantial heterogeneity. Given the multiple sources of clinical heterogeneity arising from variations in surgical protocols and analgesic regimens, a random-effects model was uniformly implemented for pooled analyses irrespective of <italic>I</italic><sup>2</sup> statistic values. To explore potential sources of heterogeneity in primary outcome, we performed meta-regression analyses using a random-effects model. Covariates included: surgery type (upper abdominal surgery, upper abdominal surgery), TAPB approach (subcostal approach, lateral approach, and posterior approach), and local anesthetic type (bupivacaine, ropivacaine). Meta-regression analyses were performed by Stata 18.0 (Stata Statistical Software Release 18; StataCorp, College Station, TX, USA, 2023).</p>
</sec>
</sec>
<sec sec-type="results" id="sec13">
<title>Results</title>
<sec id="sec14">
<title>Search results</title>
<p>The systematic retrieval across four biomedical databases (PubMed, Embase, Cochrane library, Web of science) yielded 268 candidate records as of October 31, 2024. First, we excluded 96 duplicate publications. Subsequent title/abstract screening eliminated 148 records due to: Non-target population (e.g., pediatric/emergency surgeries; <italic>n</italic>&#x202F;=&#x202F;67), Intervention mismatch (combined regional techniques; <italic>n</italic>&#x202F;=&#x202F;41), Study design ineligibility (non-RCTs; <italic>n</italic>&#x202F;=&#x202F;40). Then, full-text appraisal of the remaining 24 articles applied the PICOS exclusion hierarchy: protocol violations (<italic>n</italic>&#x202F;=&#x202F;1: mixed cardiac procedure) (<xref ref-type="bibr" rid="ref16">16</xref>); insufficient outcome reporting (<italic>n</italic>&#x202F;=&#x202F;1) (<xref ref-type="bibr" rid="ref17">17</xref>); publication type exclusion (<italic>n</italic>&#x202F;=&#x202F;1: conference abstract without peer review) (<xref ref-type="bibr" rid="ref18">18</xref>). The final synthesis incorporated 21 RCTs spanning 2019&#x2013;2024 (<xref ref-type="bibr" rid="ref9">9</xref>&#x2013;<xref ref-type="bibr" rid="ref11">11</xref>, <xref ref-type="bibr" rid="ref19">19</xref>&#x2013;<xref ref-type="bibr" rid="ref36">36</xref>), with detailed selection dynamics visualized in the PRISMA 2020 flowchart (<xref ref-type="fig" rid="fig1">Figure 1</xref>).</p>
<fig position="float" id="fig1">
<label>Figure 1</label>
<caption><p>The inclusion process of the literature search.</p></caption>
<graphic xlink:href="fmed-12-1595778-g001.tif"/>
</fig>
</sec>
<sec id="sec15">
<title>Risk of bias</title>
<p>All but one of the included studies explicitly reported the randomization methods employed (<xref ref-type="bibr" rid="ref25">25</xref>). Seven studies (33.3%) inadequately documented concealment protocols, precluding assessment of selection bias mitigation. Eleven trials (52.4%) failed to implement double-blinding procedures, compromising participant-researcher blinding integrity. Five studies (23.8%) neglected to report outcome assessor blinding status, introducing potential measurement inaccuracies. <xref ref-type="fig" rid="fig2">Figure 2</xref> presents a summary of the bias risk for the included studies.</p>
<fig position="float" id="fig2">
<label>Figure 2</label>
<caption><p>The risk bias assessment of all included studies.</p></caption>
<graphic xlink:href="fmed-12-1595778-g002.tif"/>
</fig>
</sec>
<sec id="sec16">
<title>Outcomes</title>
<sec id="sec17">
<title>Primary outcome</title>
<sec id="sec18">
<title>Postoperative 2-h pain score</title>
<p>Thirteen trials reported postoperative 2-h pain score. The forest plot indicated a significant lower pain score in ESPB group (MD&#x202F;=&#x202F;&#x2212;0.68, 95% CI [&#x2212;1.04, &#x2212;0.32], <italic>p</italic>&#x202F;&#x003C;&#x202F;0.05, <italic>I</italic><sup>2</sup>&#x202F;=&#x202F;92%, <xref ref-type="fig" rid="fig3">Figure 3</xref>), highlighting substantial heterogeneity among the studies.</p>
<fig position="float" id="fig3">
<label>Figure 3</label>
<caption><p>Forest plot of postoperative 2-h pain score between ESPB and TAPB groups. (ESPB, erector spinae plane block; TAPB, transversus abdominis plane block).</p></caption>
<graphic xlink:href="fmed-12-1595778-g003.tif"/>
</fig>
</sec>
</sec>
<sec id="sec19">
<title>Secondary outcomes</title>
<sec id="sec20">
<title>Postoperative 4-h pain score</title>
<p>Data from 12 trials demonstrated a significant reduction in pain score for the ESPB group (MD&#x202F;=&#x202F;&#x2212;0.93, 95% CI [&#x2212;1.60, &#x2212;0.26], <italic>p</italic>&#x202F;&#x003C;&#x202F;0.05), with substantial heterogeneity (<italic>I</italic><sup>2</sup> =&#x202F;96%; <xref ref-type="fig" rid="fig4">Figure 4</xref>).</p>
<fig position="float" id="fig4">
<label>Figure 4</label>
<caption><p>Forest plot of postoperative 4-h pain score between ESPB and TAPB groups. (ESPB, erector spinae plane block; TAPB, transversus abdominis plane block).</p></caption>
<graphic xlink:href="fmed-12-1595778-g004.tif"/>
</fig>
</sec>
<sec id="sec21">
<title>Postoperative 6-h pain score</title>
<p>Eight trials revealed superior analgesic efficacy in the ESPB group (MD&#x202F;=&#x202F;&#x2212;1.47, 95% CI [&#x2212;2.48, &#x2212;0.46], <italic>p</italic>&#x202F;&#x003C;&#x202F;0.05), accompanied by significant heterogeneity (<italic>I</italic><sup>2</sup>&#x202F;=&#x202F;96%; <xref ref-type="fig" rid="fig5">Figure 5</xref>).</p>
<fig position="float" id="fig5">
<label>Figure 5</label>
<caption><p>Forest plot of postoperative 6-h pain score between ESPB and TAPB groups. (ESPB, erector spinae plane block; TAPB, transversus abdominis plane block).</p></caption>
<graphic xlink:href="fmed-12-1595778-g005.tif"/>
</fig>
</sec>
<sec id="sec22">
<title>Postoperative 8-h pain score</title>
<p>Analysis of six trials confirmed sustained analgesic superiority of ESPB (MD&#x202F;=&#x202F;-0.98, 95% CI [&#x2212;1.49, &#x2212;0.47], <italic>p</italic>&#x202F;&#x003C;&#x202F;0.05), despite marked heterogeneity (<italic>I</italic><sup>2</sup>&#x202F;=&#x202F;90%; <xref ref-type="fig" rid="fig6">Figure 6</xref>).</p>
<fig position="float" id="fig6">
<label>Figure 6</label>
<caption><p>Forest plot of postoperative 8-h pain score between ESPB and TAPB groups. (ESPB, erector spinae plane block; TAPB, transversus abdominis plane block).</p></caption>
<graphic xlink:href="fmed-12-1595778-g006.tif"/>
</fig>
</sec>
<sec id="sec23">
<title>Postoperative 12-h pain score</title>
<p>Fourteen studies indicated reduced pain scores in the ESPB cohort (MD&#x202F;=&#x202F;&#x2212;0.73, 95% CI [&#x2212;1.32, &#x2212;0.13], <italic>p</italic>&#x202F;&#x003C;&#x202F;0.05), with pronounced heterogeneity (<italic>I</italic><sup>2</sup>&#x202F;=&#x202F;97%; <xref rid="SM1" ref-type="supplementary-material">Supplementary Figure 1</xref>).</p>
</sec>
<sec id="sec24">
<title>Postoperative 24-h pain score</title>
<p>Persistent analgesic benefits were observed in 14 trials for ESPB (MD&#x202F;=&#x202F;&#x2212;0.51, 95% CI [&#x2212;0.82, &#x2212;0.20], <italic>p</italic>&#x202F;&#x003C;&#x202F;0.05), maintaining high heterogeneity (<italic>I</italic><sup>2</sup>&#x202F;=&#x202F;93%; <xref rid="SM2" ref-type="supplementary-material">Supplementary Figure 2</xref>).</p>
</sec>
<sec id="sec25">
<title>Postoperative opioid consumption</title>
<p>Nineteen trials assessed postoperative opioid consumption. The forest plot revealed a significantly lower consumption in the ESPB group (SMD&#x202F;=&#x202F;&#x2212;1.25, 95% CI [&#x2212;1.66, &#x2212;0.85], <italic>p</italic>&#x202F;&#x003C;&#x202F;0.05, <italic>I</italic><sup>2</sup>&#x202F;=&#x202F;90%, <xref ref-type="fig" rid="fig7">Figure 7</xref>), indicating low heterogeneity among the studies.</p>
<fig position="float" id="fig7">
<label>Figure 7</label>
<caption><p>Forest plot of postoperative opioid consumption between ESPB and TAPB groups. (ESPB, erector spinae plane block; TAPB, transversus abdominis plane block).</p></caption>
<graphic xlink:href="fmed-12-1595778-g007.tif"/>
</fig>
</sec>
<sec id="sec26">
<title>Adverse events</title>
<p>Ten trials examined the incidence of PONV. The forest plot demonstrated no significant incidence between two groups (RR&#x202F;=&#x202F;1.13, 95% CI [0.75, 1.71], <italic>p</italic>&#x202F;&#x003E;&#x202F;0.05, <italic>I</italic><sup>2</sup>&#x202F;=&#x202F;63%, <xref ref-type="fig" rid="fig8">Figure 8</xref>). No operative-related event was reported in both groups.</p>
<fig position="float" id="fig8">
<label>Figure 8</label>
<caption><p>Forest plot of the incidence of PONV between ESPB and TAPB groups. (PONV, postoperative nausea and vomiting; ESPB, erector spinae plane block; TAPB, transversus abdominis plane block).</p></caption>
<graphic xlink:href="fmed-12-1595778-g008.tif"/>
</fig>
</sec>
<sec id="sec27">
<title>Meta-regression analysis</title>
<p>Meta-regression revealed no significant associations between the prespecified covariates (surgery type, TAPB approach, or local anesthetic) and heterogeneity in postoperative <italic>2-h</italic> pain scores (all <italic>p</italic>-values &#x003E; 0.05) (<xref ref-type="table" rid="tab1">Table 1</xref>).</p>
<table-wrap position="float" id="tab1">
<label>Table 1</label>
<caption><p>The details of included studies.</p></caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th align="left" valign="top">Study</th>
<th align="center" valign="top">Age</th>
<th align="center" valign="top">Sample size</th>
<th align="center" valign="top">ASA scale</th>
<th align="left" valign="top">Type of surgery</th>
<th align="left" valign="top">ESPB group</th>
<th align="left" valign="top">TAPB group</th>
<th align="left" valign="top">Anesthesia</th>
<th align="left" valign="top">PCIA</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">Abdelhamid et al. (<xref ref-type="bibr" rid="ref19">19</xref>)</td>
<td align="center" valign="top">18&#x2013;59</td>
<td align="center" valign="top">44</td>
<td align="center" valign="top">II-III</td>
<td align="left" valign="top">Laparoscopic sleeve gastrectomy</td>
<td align="left" valign="top">Location: 2&#x2013;3&#x202F;cm lateral to T9;<break/>Local anesthetic: 0.25% bupivacaine 15&#x202F;mL on each side.</td>
<td align="left" valign="top">Location: oblique subcostal approach;<break/>Local anesthetic: 30&#x202F;mL of 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Abdullah et al. (<xref ref-type="bibr" rid="ref20">20</xref>)</td>
<td align="center" valign="top">18&#x2013;65</td>
<td align="center" valign="top">60</td>
<td align="center" valign="top">I-II</td>
<td align="left" valign="top">Ovarian cancer surgery</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to T10;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">Location: at the level of the umbilicus;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">Fentanyl</td>
</tr>
<tr>
<td align="left" valign="top">Altiparmak et al. (<xref ref-type="bibr" rid="ref21">21</xref>)</td>
<td align="center" valign="top">18&#x2013;70</td>
<td align="center" valign="top">68</td>
<td align="center" valign="top">I-II</td>
<td align="left" valign="top">Laparoscopic cholecystectomy</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to T7;<break/>Local anesthetic: 20&#x202F;mL 0.375% bupivacaine on each side.</td>
<td align="left" valign="top">Location: oblique subcostal approach;<break/>Local anesthetic: 20&#x202F;mL 0.375% bupivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">Tramadol</td>
</tr>
<tr>
<td align="left" valign="top">Bakeer et al. (<xref ref-type="bibr" rid="ref22">22</xref>)</td>
<td align="center" valign="top">18&#x2013;65</td>
<td align="center" valign="top">62</td>
<td align="center" valign="top">II-III</td>
<td align="left" valign="top">Abdominal surgery</td>
<td align="left" valign="top">Not mentioned.</td>
<td align="left" valign="top">Not mentioned.</td>
<td align="left" valign="top">Not mentioned</td>
<td align="left" valign="top">Morphine</td>
</tr>
<tr>
<td align="left" valign="top">Boules et al. (<xref ref-type="bibr" rid="ref23">23</xref>)</td>
<td align="center" valign="top">18&#x2013;40</td>
<td align="center" valign="top">60</td>
<td align="center" valign="top">I-II</td>
<td align="left" valign="top">Cesarean</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to T10;<break/>Local anesthetic: 20&#x202F;mL 0.5% bupivacaine on each side.</td>
<td align="left" valign="top">Location: between the costal margin and iliac crest<break/>Local anesthetic: 20&#x202F;mL 0.5% bupivacaine on each side.</td>
<td align="left" valign="top">Spinal anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Eksteen et al. (<xref ref-type="bibr" rid="ref11">11</xref>)</td>
<td align="center" valign="top">&#x003E;18</td>
<td align="center" valign="top">66</td>
<td align="center" valign="top">I-III</td>
<td align="left" valign="top">Cesarean</td>
<td align="left" valign="top">Location: 2&#x2013;3&#x202F;cm lateral to T9;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">Location: between the costal margin and iliac crest;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">Spinal anesthesia</td>
<td align="left" valign="top">Morphine</td>
</tr>
<tr>
<td align="left" valign="top">Elshazly et al. (<xref ref-type="bibr" rid="ref24">24</xref>)</td>
<td align="center" valign="top">18&#x2013;60</td>
<td align="center" valign="top">60</td>
<td align="center" valign="top">II-III</td>
<td align="left" valign="top">Laparoscopic cholecystectomy or paraumbilical hernia repair</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to T5;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">Location: oblique subcostal approach;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Ghielmini et al. (<xref ref-type="bibr" rid="ref10">10</xref>)</td>
<td align="center" valign="top">&#x003E;18</td>
<td align="center" valign="top">50</td>
<td align="center" valign="top">I-II</td>
<td align="left" valign="top">Robot assisted hernia repair</td>
<td align="left" valign="top">Location: at the level of T10;<break/>Local anesthetic: 30&#x202F;mL 0.2% ropivacaine on each side.</td>
<td align="left" valign="top">Location: in the triangle of Peti;<break/>Local anesthetic: 30&#x202F;mL 0.2% ropivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Hassanin et al. (<xref ref-type="bibr" rid="ref25">25</xref>)</td>
<td align="center" valign="top">20&#x2013;50</td>
<td align="center" valign="top">62</td>
<td align="center" valign="top">I-III</td>
<td align="left" valign="top">Emergency laparotomy</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to T8;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">Location: between the costal margin and iliac crest;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Hou et al. (<xref ref-type="bibr" rid="ref9">9</xref>)</td>
<td align="center" valign="top">18&#x2013;65</td>
<td align="center" valign="top">60</td>
<td align="center" valign="top">I-III</td>
<td align="left" valign="top">Laparoscopic radical surgery</td>
<td align="left" valign="top">Location: 2&#x2013;3&#x202F;cm lateral to T9;<break/>Local anesthetic: 20&#x202F;mL 0.2% ropivacaine on each side.</td>
<td align="left" valign="top">Location: oblique subcostal approach;<break/>Local anesthetic: 20&#x202F;mL 0.2% ropivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">Sufentani</td>
</tr>
<tr>
<td align="left" valign="top">Ibrahim et al. (<xref ref-type="bibr" rid="ref26">26</xref>)</td>
<td align="center" valign="top">20&#x2013;60</td>
<td align="center" valign="top">42</td>
<td align="center" valign="top">I-III</td>
<td align="left" valign="top">Laparoscopic cholecystectomy</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to L3;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">Location: oblique subcostal approach;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">Tramadol</td>
</tr>
<tr>
<td align="left" valign="top">Kamel et al. (<xref ref-type="bibr" rid="ref27">27</xref>)</td>
<td align="center" valign="top">40&#x2013;60</td>
<td align="center" valign="top">48</td>
<td align="center" valign="top">I-II</td>
<td align="left" valign="top">Open total abdominal hysterectomy</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to T9;<break/>Local anesthetic: 20&#x202F;mL 0.375% bupivacaine on each side.</td>
<td align="left" valign="top">Location: between the costal margin and iliac crest;<break/>Local anesthetic: 20&#x202F;mL 0.375% bupivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Langoo et al. (<xref ref-type="bibr" rid="ref28">28</xref>)</td>
<td align="center" valign="top">18&#x2013;40</td>
<td align="center" valign="top">60</td>
<td align="center" valign="top">II</td>
<td align="left" valign="top">Cesarean</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to T10;<break/>Local anesthetic: 20&#x202F;mL 0.2% ropivacaine on each side.</td>
<td align="left" valign="top">Location: between the costal margin and iliac crest;<break/>Local anesthetic: 20&#x202F;mL 0.2% ropivacaine on each side.</td>
<td align="left" valign="top">Spinal anesthesia</td>
<td align="left" valign="top">Diclofenac</td>
</tr>
<tr>
<td align="left" valign="top">Malawat et al. (<xref ref-type="bibr" rid="ref29">29</xref>)</td>
<td align="center" valign="top">18&#x2013;80</td>
<td align="center" valign="top">60</td>
<td align="center" valign="top">I-III</td>
<td align="left" valign="top">Cesarean</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to T9;<break/>Local anesthetic: 0.2% ropivacaine 0.2&#x202F;mL/kg on each side.</td>
<td align="left" valign="top">Location: between the costal margin and iliac crest;<break/>Local anesthetic: 0.2% ropivacaine 0.2&#x202F;mL/kg on each side.</td>
<td align="left" valign="top">Spinal anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Mostafa et al. (<xref ref-type="bibr" rid="ref30">30</xref>)</td>
<td align="center" valign="top">18</td>
<td align="center" valign="top">60</td>
<td align="center" valign="top">I-III</td>
<td align="left" valign="top">Open liver resection surgery</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to T7;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">Location: oblique subcostal approach;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Mounika et al. (<xref ref-type="bibr" rid="ref31">31</xref>)</td>
<td align="center" valign="top">18&#x2013;70</td>
<td align="center" valign="top">138</td>
<td align="center" valign="top">I-II</td>
<td align="left" valign="top">Laparoscopic cholecystectomy</td>
<td align="left" valign="top">Location: the level of T7;<break/>Local anesthetic: 20&#x202F;mL 0.2% ropivacaine on each side.</td>
<td align="left" valign="top">Location: oblique subcostal approach;<break/>Local anesthetic: 20&#x202F;mL 0.2% ropivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Ozdemir et al. (<xref ref-type="bibr" rid="ref32">32</xref>)</td>
<td align="center" valign="top">18&#x2013;64</td>
<td align="center" valign="top">64</td>
<td align="center" valign="top">I-III</td>
<td align="left" valign="top">Laparoscopic cholecystectomy</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to T7;<break/>Local anesthetic: 10&#x202F;mL 0.25% bupivacaine and 10&#x202F;mL of 2% prilocaine on each side.</td>
<td align="left" valign="top">Location: oblique subcostal approach;<break/>Local anesthetic: 10&#x202F;mL 0.25% bupivacaine and 10&#x202F;mL of 2% prilocaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Qi-Hong et al. (<xref ref-type="bibr" rid="ref33">33</xref>)</td>
<td align="center" valign="top">65</td>
<td align="center" valign="top">62</td>
<td align="center" valign="top">I-III</td>
<td align="left" valign="top">Laparoscopic colorectal surgery</td>
<td align="left" valign="top">Location: 2&#x2013;3&#x202F;cm lateral to T9;<break/>Local anesthetic: 20&#x202F;mL 0.25% ropivacaine on each side.</td>
<td align="left" valign="top">Location: oblique subcostal approach;<break/>Local anesthetic: 20&#x202F;mL 0.25% ropivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">Sufentanil</td>
</tr>
<tr>
<td align="left" valign="top">Sahu et al. (<xref ref-type="bibr" rid="ref34">34</xref>)</td>
<td align="center" valign="top">18&#x2013;70</td>
<td align="center" valign="top">60</td>
<td align="center" valign="top">I-II</td>
<td align="left" valign="top">Laparoscopic cholecystectomy</td>
<td align="left" valign="top">Location: 2&#x2013;3&#x202F;cm lateral to T7;<break/>Local anesthetic: 20&#x202F;mL 0.2% ropivacaine on each side.</td>
<td align="left" valign="top">Location: oblique subcostal approach;<break/>Local anesthetic: 20&#x202F;mL 0.2% ropivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Shukla et al. (<xref ref-type="bibr" rid="ref35">35</xref>)</td>
<td align="center" valign="top">35&#x2013;60</td>
<td align="center" valign="top">30</td>
<td align="center" valign="top">I-II</td>
<td align="left" valign="top">Open total abdominal hysterectomy</td>
<td align="left" valign="top">Location: 3&#x202F;cm lateral to T9;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">Location: between the costal margin and iliac crest;<break/>Local anesthetic: 20&#x202F;mL 0.25% bupivacaine on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">Warner et al. (<xref ref-type="bibr" rid="ref36">36</xref>)</td>
<td align="center" valign="top">18</td>
<td align="center" valign="top">77</td>
<td align="center" valign="top">I-IV</td>
<td align="left" valign="top">Laparoscopic hysterectomy</td>
<td align="left" valign="top">0.125% bupivacaine 20&#x202F;mL at T8 and 20&#x202F;mL at T12 on each side.</td>
<td align="left" valign="top">0.125% bupivacaine 20&#x202F;mL for the subcostal TAP and 20&#x202F;mL for the posterior TAP on each side.</td>
<td align="left" valign="top">General anesthesia</td>
<td align="left" valign="top">None</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<p>ASA, American society of anesthesiologists; ESPB, Erector spinae plane block; TAPB, Transversus abdominis plane block; PCIA, Patient controlled intravenous analgesia.</p>
</table-wrap-foot>
</table-wrap>
</sec>
<sec id="sec28">
<title>GRADE result</title>
<p><xref ref-type="table" rid="tab2">Table 2</xref> shows the summary of the GRADE assessment.</p>
<table-wrap position="float" id="tab2">
<label>Table 2</label>
<caption><p>The summary of GRADE for included studies.</p></caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th align="left" valign="top">Outcome</th>
<th align="center" valign="top">Included studies (<italic>n</italic>)</th>
<th align="center" valign="top">Patients (<italic>n</italic>)</th>
<th align="left" valign="top">Quality of evidence</th>
<th align="left" valign="top">Reasons</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">Postoperative 2-h pain score</td>
<td align="center" valign="top">13</td>
<td align="center" valign="top">835</td>
<td align="center" valign="top">&#x2A01;&#x2A01;&#x2A01;&#x25EF;<break/>MODERATE</td>
<td align="left" valign="top">&#x201C;Inconsistency&#x201D; was downgraded to &#x201C;serious.&#x201D;</td>
</tr>
<tr>
<td align="left" valign="top">Postoperative 4-h pain score</td>
<td align="center" valign="top">12</td>
<td align="center" valign="top">750</td>
<td align="center" valign="top">&#x2A01;&#x2A01;&#x2A01;&#x25EF;<break/>MODERATE</td>
<td align="left" valign="top">&#x201C;Inconsistency&#x201D; was downgraded to &#x201C;serious.&#x201D;</td>
</tr>
<tr>
<td align="left" valign="top">Postoperative 6-h pain score</td>
<td align="center" valign="top">8</td>
<td align="center" valign="top">440</td>
<td align="center" valign="top">&#x2A01;&#x2A01;&#x2A01;&#x25EF;<break/>MODERATE</td>
<td align="left" valign="top">&#x201C;Inconsistency&#x201D; was downgraded to &#x201C;serious.&#x201D;</td>
</tr>
<tr>
<td align="left" valign="top">Postoperative 8-h pain score</td>
<td align="center" valign="top">6</td>
<td align="center" valign="top">426</td>
<td align="center" valign="top">&#x2A01;&#x2A01;&#x2A01;&#x25EF;<break/>MODERATE</td>
<td align="left" valign="top">&#x201C;Inconsistency&#x201D; was downgraded to &#x201C;serious.&#x201D;</td>
</tr>
<tr>
<td align="left" valign="top">Postoperative 12-h pain score</td>
<td align="center" valign="top">14</td>
<td align="center" valign="top">878</td>
<td align="center" valign="top">&#x2A01;&#x2A01;&#x2A01;&#x25EF;<break/>MODERATE</td>
<td align="left" valign="top">&#x201C;Inconsistency&#x201D; was downgraded to &#x201C;serious.&#x201D;</td>
</tr>
<tr>
<td align="left" valign="top">Postoperative 24-h pain score</td>
<td align="center" valign="top">14</td>
<td align="center" valign="top">878</td>
<td align="center" valign="top">&#x2A01;&#x2A01;&#x2A01;&#x25EF;<break/>MODERATE</td>
<td align="left" valign="top">&#x201C;Inconsistency&#x201D; was downgraded to &#x201C;serious.&#x201D;</td>
</tr>
<tr>
<td align="left" valign="top">Postoperative opioid consumption</td>
<td align="center" valign="top">19</td>
<td align="center" valign="top">1,185</td>
<td align="center" valign="top">&#x2A01;&#x2A01;&#x25EF;&#x25EF;<break/>LOW</td>
<td align="left" valign="top">&#x201C;Imprecision&#x201D; and &#x201C;Inconsistency&#x201D; were downgraded to &#x201C;serious.&#x201D;</td>
</tr>
<tr>
<td align="left" valign="top">Incidence of PONV</td>
<td align="center" valign="top">10</td>
<td align="center" valign="top">581</td>
<td align="center" valign="top">&#x2A01;&#x2A01;&#x2A01;&#x25EF;<break/>MODERATE</td>
<td align="left" valign="top">&#x201C;Inconsistency&#x201D; was downgraded to &#x201C;serious.&#x201D;</td>
</tr>
</tbody>
</table>
<table-wrap-foot>
<p>PONV, postoperative nausea and vomiting.</p>
</table-wrap-foot>
</table-wrap>
</sec>
</sec>
</sec>
</sec>
<sec sec-type="discussion" id="sec29">
<title>Discussion</title>
<p>Our meta-analysis investigated the safety and effectiveness of ESPB in abdominal surgeries while comparing with TAPB. The results showed that ESPB significantly decreased postoperative pain scores and opioid consumption.</p>
<p>Abdominal surgical pain originates from multiple sources: incisional discomfort, visceral nociception, tissue trauma, CO&#x2082; insufflation-induced shoulder pain, and phrenic nerve irritation (<xref ref-type="bibr" rid="ref37">37</xref>). This multimodal pathophysiology results in concurrent somatic and visceral pain perception. Effective multimodal analgesia enhances patient satisfaction, accelerates functional recovery, reduces hospitalization duration, and decreases thromboembolic risks through improved early mobilization (<xref ref-type="bibr" rid="ref38">38</xref>). Existing evidence confirms the analgesic efficacy of both TAPB and ESPB in abdominal surgical settings. However, contemporary meta-analyses present discordant conclusions regarding their comparative effectiveness. Thus, we conducted this systematic review with meta-analysis incorporating 21 randomized controlled trials (<italic>N</italic>&#x202F;=&#x202F;1,293 patients) to compare the efficacy of ESPB versus TAPB for postoperative analgesia.</p>
<p>Our meta-analysis demonstrated the analgesic superiority of ESPB over TAPB, evidenced by significantly reduced postoperative pain scores and lower opioid consumption. While the precise mechanism of ESPB&#x2019;s analgesic action remains debated within the scientific community, emerging cadaveric and radiological evidence suggests dual neural targeting - simultaneously engaging both ventral and dorsal rami of spinal nerves through fascial compartment diffusion (<xref ref-type="bibr" rid="ref39">39</xref>, <xref ref-type="bibr" rid="ref40">40</xref>). This bidirectional blockade achieves comprehensive somatic-visceral pain control, a mechanistic advantage over TAPB&#x2019;s limited anterior ramus inhibition.</p>
<p>We further evaluated the safety of ultrasound-guided ESPB, and none of the included studies reported procedure-related complications. Current literature suggests that severe complications occur in fewer than 0.02% (2 per 10,000) of cases (<xref ref-type="bibr" rid="ref39">39</xref>), with documented adverse events involving motor nerve blockade, lung puncture (pneumothorax), accidental vascular puncture, and systemic toxic reactions. The procedure&#x2019;s safety advantage stems from its anatomical approach, where injectates are deliberately positioned distal to vulnerable neurovascular structures like the spinal canal, pleural membranes, and major blood vessels.</p>
<p>Our study has limitations to consider. First, the significant differences in pain scores and opioid use across postoperative time points may stem from varied surgical and pain management approaches. Although we accounted for this using statistical methods, results should be interpreted carefully. Second, a small number of included studies exhibited a high risk of bias.</p>
</sec>
<sec sec-type="conclusions" id="sec30">
<title>Conclusion</title>
<p>This systematic review and meta-analysis demonstrates that ultrasound-guided ESPB provides superior postoperative analgesia compared to TAPB. Our meta-regression did not identify surgery type, TAPB approach, or local anesthetic properties as sources of heterogeneity, future research should prioritize prospective studies with stratified designs to evaluate these covariates in homogenous surgical populations.</p>
</sec>
</body>
<back>
<sec sec-type="data-availability" id="sec31">
<title>Data availability statement</title>
<p>The original contributions presented in the study are included in the article/<xref ref-type="sec" rid="sec37">Supplementary material</xref>, further inquiries can be directed to the corresponding author.</p>
</sec>
<sec sec-type="author-contributions" id="sec32">
<title>Author contributions</title>
<p>LQ: Conceptualization, Methodology, Writing &#x2013; original draft. N-qH: Project administration, Resources, Supervision, Writing &#x2013; original draft. Q-hS: Project administration, Resources, Supervision, Writing &#x2013; original draft. KN: Project administration, Writing &#x2013; review &#x0026; editing.</p>
</sec>
<sec sec-type="funding-information" id="sec33">
<title>Funding</title>
<p>The author(s) declare that no financial support was received for the research and/or publication of this article.</p>
</sec>
<sec sec-type="COI-statement" id="sec34">
<title>Conflict of interest</title>
<p>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.</p>
</sec>
<sec sec-type="ai-statement" id="sec35">
<title>Generative AI statement</title>
<p>The authors declare that no Gen AI was used in the creation of this manuscript.</p>
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<sec sec-type="disclaimer" id="sec36">
<title>Publisher&#x2019;s note</title>
<p>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.</p>
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<sec sec-type="supplementary-material" id="sec37">
<title>Supplementary material</title>
<p>The Supplementary material for this article can be found online at: <ext-link xlink:href="https://www.frontiersin.org/articles/10.3389/fmed.2025.1595778/full#supplementary-material" ext-link-type="uri">https://www.frontiersin.org/articles/10.3389/fmed.2025.1595778/full#supplementary-material</ext-link></p>
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