ECHM Consensus Conference and levels of evidence - Reply

Area of Science:

• Hyperbaric medicine and evidence-based practice.
• Clinical trial methodology and evidence grading.
• Medical consensus and guideline development.

Background:

• Clarification requested on the European Committee on Hyperbaric Medicine's (ECHM) evidence assessment for hyperbaric oxygen treatment (HBOT).
• Previous publication contained errors in table layouts affecting conclusions on ECHM recommendations and evidence levels.
• Discussion on the ECHM's methodology for scoring evidence, specifically the requirement for double-blind randomized controlled trials (RCTs) for Level A evidence.

Discussion:

• The ECHM prioritizes double-blind RCTs for Level A evidence to mitigate bias, acknowledging the difficulty in achieving this standard in hyperbaric research.
• Consensus conferences are valued for transparent discussion and audience voting, reflecting the broader European hyperbaric community's stance on recommendations.
• The ethical and practical challenges of 'sham' treatments in hyperbaric research are acknowledged, drawing parallels with surgical studies.

Key Insights:

• Republished tables correct previous layout errors, aiming to resolve reader misunderstandings regarding ECHM methodology and evidence levels.
• ECHM's stringent criteria for Level A evidence (double-blind RCTs) may limit the available high-level evidence for HBOT indications.
• The ECHM approach aims to prevent the arbitrary application of evidence scoring systems through transparent consensus-building processes.

Outlook:

• A detailed report on the ECHM's recommendations for idiopathic sudden sensorineural hearing loss (ISSHH), scored as Level B evidence, is forthcoming.
• The ECHM's consensus process provides a robust framework for evaluating evidence and formulating guidelines in hyperbaric medicine.
• Future research may focus on addressing the methodological challenges in conducting double-blind RCTs for HBOT to strengthen the evidence base.