Patient-Reported Outcomes in Nerve Block Trials: Critical Gaps in Reporting Standards Revealed

Are We Underestimating PRO Standards in Peripheral Nerve Block Trials?

The reporting quality of patient-reported outcomes (PROs) in peripheral nerve block (PNB) clinical trials remains suboptimal despite widespread journal endorsement of reporting guidelines, according to a comprehensive meta-epidemiological study published recently. This investigation of 65 randomized controlled trials (RCTs) from 2006-2020 found that studies adhered to less than half of the recommended reporting criteria, potentially hampering clinicians' ability to make fully informed, patient-centered decisions about regional anesthesia techniques.

Patient-reported outcomes represent a crucial dimension in evaluating the effectiveness of medical interventions from patients' perspectives, without third-party interpretation. In the field of regional anesthesia, PROs such as pain scores are commonly employed, yet their reporting quality has not been previously assessed against established guidelines. The Consolidated Standards of Reporting Trials (CONSORT) statement, designed to improve transparency in clinical trial reporting, was extended in 2013 with CONSORT-PRO to provide specific guidance on PRO reporting. This meta-epidemiological study examined how well PNB trials have adhered to these standards and identified factors associated with better reporting quality.

How Was the Meta-Epidemiological Study Conducted?

The researchers conducted a cross-sectional, meta-epidemiological analysis by searching through Cochrane Central Register of Controlled Trials, Embase, and MEDLINE databases using the OVID interface. They included RCTs published between 2006 and 2020 investigating peripheral nerve blocks that incorporated at least one PRO measure as a primary or secondary outcome. The study focused specifically on nerve blocks outside the vertebral column, excluding neuraxial techniques. After screening 1084 records and removing duplicates, 65 studies qualified for final data extraction. Two investigators independently scored each trial using an 18-item CONSORT-PRO checklist, evaluating aspects ranging from abstract identification and rationale to instrument validity and results interpretation.

Do the Results Uncover Gaps in PRO Reporting?

The investigation revealed an overall mean adherence to CONSORT-PRO guidelines of just 46.80% across all included trials. Notably, studies designating PROs as primary outcomes demonstrated significantly better adherence (49.27%) compared to those using PROs as secondary outcomes (38.57%, p=0.035). This finding suggests that when PROs are not the central focus of a study, researchers may devote less attention to their methodological rigor and comprehensive reporting. The most consistently reported item across all trials was the inclusion of precision estimates such as confidence intervals or effect sizes (83.08% adherence), while the least reported element was the specification of PRO domains in the hypothesis (3.08% adherence).

Interestingly, the study identified specific trial characteristics associated with higher reporting quality. Trials with longer follow-up periods (6-12 months) demonstrated significantly better adherence (coefficient: 16.24%, p=0.006) compared to those with shorter follow-up (≤3 months). Additionally, studies employing a combination of pain scales (visual analog scale [VAS] or numeric rating scale [NRS]) plus other validated PRO instruments showed substantially higher adherence rates than those using VAS alone. This suggests that researchers who implement more comprehensive PRO assessment strategies may also be more attentive to reporting guidelines.

Risk of bias assessment using the Cochrane RoB 2.0 tool revealed concerning results, with 53.85% of the included trials categorized as having "high" risk of bias, 7.69% with "some concerns," and only 38.46% with "low" risk. However, the analysis did not find a significant association between risk of bias and adherence to CONSORT-PRO guidelines. The most common interventions assessed were anesthetic techniques (87.69% of trials), with femoral nerve block being the most frequently studied block technique.

Can Journal Policies and Cross-Disciplinary Comparisons Guide Improvements?

Despite approximately 80% of the included studies being published in journals that endorse CONSORT guidelines, adherence rates have not improved since 2014 (the year following CONSORT-PRO publication). Moreover, only 15% of the articles explicitly acknowledged these guidelines. Perhaps most concerning was the finding that there was no adherence advantage for journals that required (β=-0.71%, p=0.90) or recommended (β=-2.74%, p=0.67) guideline adherence compared to those making no mention of it. This disconnect between endorsement and enforcement highlights a significant gap in the implementation of reporting standards.

The findings align with reporting rates observed in other procedure-oriented disciplines, including orthopedic sports medicine (49.70%), urogynecology (50.53%), and gastroenterology (46.77%). This consistency across specialties suggests that the methodological barriers to comprehensive PRO reporting may be systemic rather than domain-specific. By contrast, immune checkpoint inhibitor trials in oncology have demonstrated substantially higher adherence (78.33%), indicating that high-quality reporting is achievable and providing practical examples for future PNB trial design.

How Can We Enhance Reporting Practices Across the Board?

The authors emphasize that improved reporting of PROs is essential for advancing patient-centered healthcare. They recommend that even when PROs are designated as secondary outcomes, authors should report them comprehensively following CONSORT-PRO guidelines or consider developing a separate manuscript dedicated specifically to PRO results. Furthermore, they encourage researchers to implement diverse, validated PRO tools beyond simple pain scales to capture a more holistic picture of patient experiences.

For journal editors and publishers, the study highlights an opportunity to strengthen enforcement mechanisms by mandating CONSORT-PRO checklist submission and highlighting the guidelines in clinical trial registrations. The authors also advocate for greater awareness and training on reporting standards through the EQUATOR Network for authors, trialists, editors, and clinicians. These measures could significantly enhance reporting quality and, ultimately, improve patient-centered decision-making in regional anesthesia practice.

What Future Directions Will Enhance Patient-Centered Evidence?

Looking ahead, the researchers suggest that future studies should examine PRO guideline adherence across the broader field of anesthesia and track whether adherence to CONSORT-PRO improves reporting quality over time. They specifically note the need for dedicated evaluations of PRO reporting in spinal, epidural, and combined neuraxial blocks, which were outside the scope of their review. A meta-epidemiological comparison between different anesthetic techniques could provide valuable insights into whether reporting practices vary by approach and guide targeted educational initiatives aimed at closing persistent reporting gaps.

This study's findings raise important questions for clinical researchers and practitioners in the field. How might the current gaps in PRO reporting affect clinical interpretations of PNB efficacy? What practical steps can researchers take to improve adherence to reporting guidelines when designing new trials? Could enhanced enforcement mechanisms at the journal level effectively drive improvements in reporting quality? As regional anesthesia continues to evolve, addressing these reporting deficiencies will be essential for building a more robust, patient-centered evidence base to guide clinical practice.

Summary

A meta-epidemiological analysis of 65 randomized controlled trials from 2006-2020 reveals that peripheral nerve block studies demonstrate only 46.80% adherence to CONSORT-PRO guidelines for patient-reported outcomes. Studies with PROs as primary outcomes showed better adherence (49.27%) compared to those using PROs as secondary outcomes (38.57%). Longer follow-up periods and use of multiple PRO instruments were associated with higher reporting quality. Despite 80% of studies being published in journals endorsing CONSORT guidelines, adherence rates haven't improved since 2014. The study emphasizes the need for enhanced reporting practices, stronger enforcement mechanisms, and comprehensive PRO documentation to improve patient-centered decision-making in regional anesthesia.