Background
Given the immune impairment associated with diabetes mellitus (DM), its impact on chronic rhinosinusitis (CRS) is a potentially relevant concern, yet it has not been well-studied. A single retrospective study reported worse post-operative quality of life outcomes in diabetic CRS patients. Our study evaluated the effect of comorbid DM on outcomes of endoscopic sinus surgery (ESS) using a prospective study design.
Methods
Using a multi-centered, prospective cohort of patients (n=437) undergoing ESS for recalcitrant CRS, a nested case-control comparison was performed between 20 DM adult patients (cases) and 20 non-diabetic patients (controls), matched 1:1 for age and Lund-Mackay CT scores. Outcome measures included 22-item Sinonasal Outcome Test (SNOT-22), Rhinosinusitis Disability Index (RSDI), Patient Health Questionnaire (PHQ-2), and Brief Smell Identification Test (BSIT).
Results
Mean follow-up was similar between cases (12.6[6.0] months) and controls (12.9[5.9] months; p=0.862). All preoperative scores were statistically equivalent between DM and non-DM cohorts. Both cohorts showed significant post-ESS improvement in SNOT-22 (p=0.001) and RSDI scores (p<0.001), and no significant change in PHQ-2 or BSIT scores. The magnitude of score changes was statistically equivalent between the two cohorts for all outcome measures with no differences in postoperative score changes between insulin-dependent diabetics and those managed by oral hypoglycemics or dietary restriction (p≥0.444).
Conclusions
Diabetic CRS patients experience similar degrees of symptomatic benefit from ESS compared to controls. Insulin dependence does not appear to adversely affect surgical outcome but a larger cohort would better assess the effect of diabetes type and control on surgical outcomes in CRS.