Ambient carbon monoxide correlates with mortality risk of hemodialysis patients: comparing results of control selection in the case-crossover designs

Background: Growing evidence suggests that environmental air pollution adversely affects kidney health. To date, the association be-tween carbon monoxide (CO) and mortality in patients with end-stage renal disease (ESRD) has not been examined.Methods: Among 134,478 dialysis patients in the Korean ESRD cohort between 2001 and 2014, 8,130 deceased hemodialysis pa-tients were enrolled, and data were analyzed using bidirectional, unidirectional, and time-stratified case-crossover design. We exam-ined the association between short-term CO concentration and mortality in patients with ESRD. We used a two-pollutant model, ad-justed for temperature as a climate factor and for nitrogen dioxide (NO2), sulfur dioxide (SO2), ozone (O3), and particulate matter less than 10 mu m in diameter as air pollution variables other than CO.Results: Characteristics of the study population included age (66.2 +/- 12.1 years), sex (male, 59.1%; female, 40.9%), and comorbidi-ties (diabetes, 55.6%; hypertension, 14.4%).Concentration of CO was significantly associated with all-cause mortality in the three case-crossover designs using the two-pollutant model adjusted for SO2. Patients with diabetes or age older than 75 years had a high-er risk of mortality than patients without diabetes or those younger than 75 years. Conclusion: Findings presented here suggest that higher CO concentration is correlated with increased all-cause mortality in hemodi-alysis patients, especially in older high-risk patients.