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Stratified analysis by age, sex, left ventricular ejection fraction, on treatment with loop diuretic at home, creatinine concentration at emergency department arrival and severity of the acute heart failure episode assessed by the MEESSI-AHF scale. Bold numbers denote statistical significance (P < 0.05). CI, confidence interval; LL, lower limit; LVEF, left ventricular ejection fraction; OR, odds ratio; UL, upper limit.
