Patient Before Emergency admission* At Emergency admission One day after Emergency admission After Emergency admission** No sCr sK+ sCr sK+ sCr sK+ sCr sK+ 1 NA NA 1.6 8.2 1.5 7.5 NA NA 2§ NA NA 2.5 7.9 2.1 7 NA NA 3 1.4 5.9 8.9 6.3 7.8 5.1 1.4 3.9 4 NA NA 1.7 7.9 NA NA 1.5 4.3 5 1.4 4 2.2 6.9 2.3 5.4 1.1 5.4 6 1.1 3.7 2.2 7 1.7 5.2 1.1 3.9 7 NA NA 2.9 8.5 2.6 8 NA NA Over-65- individuals ≥ 65 year-old; ACEI: Angiotensin-Converting Enzyme Inhibitor; *from 1 to 3 months before Emergency admission; **between 1 month and 1 year from Hospital discharge; sCr: serum creatinine (mg/dl); sK+: serum potassium (mEq/l); NA: not available; §this patient died before Hospital discharge and it couldn’t be retrieved the cause of death

Table 5: Laboratory findings of seven over-65 patients with serum potassium ≥ 6 mEq/l at Hospital admission. All patients were undergoing treatment with angiotensinconverting enzyme inhibition and aldosterone antagonist or potassium sparing diuretics.