Comment on “Evaluating Hypoglossal Nerve Stimulation Outcomes in Obstructive Sleep Apnea: Impact of Predisposing Conditions in a Retrospective Cohort”

Hypoglossal nerve stimulation (HNS) is an emerging therapy for obstructive sleep apnea (OSA), and recent research has explored the influence of comorbidities on treatment outcomes. While these findings offer valuable insights, several methodological limitations should be considered. The reliance on non-standardized clinician documentation for conditions such as depression and insomnia may introduce diagnostic variability, particularly given symptom overlap with OSA. Use of self-reported device adherence, without objective usage data, may further limit accuracy. Additionally, the absence of validated patient-reported outcome measures reduces comparability across studies. A high attrition rate raises concerns about potential selection bias, and unaddressed confounders—including medication use, socioeconomic factors, and variability in treatment protocols—may influence results. Methodological concerns also include single-reviewer data extraction and a short follow-up period, limiting assessment of long-term efficacy. Addressing these issues in future studies will improve the reliability and generalizability of findings related to HNS outcomes.