Abstract
PurposeTo examine an association between red blood cell distribution width (RDW) and the prognosis of influenza patients. MethodsWe conducted a retrospective analysis of patients hospitalized with influenza during 2012–2015 in the internal medicine wards of one medical center. RDW measurements during hospitalization were analyzed. Primary outcome was complicated hospitalization (defined as at least one of: length of stay ≥7days, need for mechanical ventilation, septic shock, transfer to intensive-care, or 30-day mortality). Secondary outcome was 30-day mortality. Results153 patients were included, mean age: 62.5±1, 82 (54%) male; 84 (55%) had a high RDW value (>14.5%) during hospitalization. Patients with high and low RDW (≤14.5%) had similar age and comorbidity profiles, but those with high RDW had lower hemoglobin and higher creatinine levels. Patients with high RDW had a higher rate of complicated hospitalization (32.5% vs. 10.3%, p<0.01) and a trend for increased 30-day mortality. In a multivariate regression model, high RDW was a predictor of complicated hospitalization (OR 5.03, 95% CI 1.81–13.93, p<0.01). Each 1-point increase in RDW was associated with a 29% increase in the risk for the primary outcome. ConclusionRDW>14.5% was a predictor of severe hospital complications in patients with influenza.
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