Brueske B, et al. - In unselected cardiac intensive care unit (CICU) patients, researchers investigated whether hyperkalemia was related to increased mortality. For this purpose, they retrospectively examined 9681 CICU patients admitted from January 2007 to December 2015. Admission potassium ≥5.0 mEq/L and <3.5 mEq/L defined hyperkalemia and hypokalemia, respectively. They assessed predictors of in-hospital mortality using multivariate logistic regression. Findings revealed that a higher in-hospital and postdischarge mortality was observed in relation to hyperkalemia on CICU admission; this link was noted to be independent of renal function and illness severity. In patients admitted to the CICU, potassium abnormalities hold significance as a risk predictor.