We read with great interest the recent article by Suzuki et al., recently published in the European Journal of Internal Medicine [1]. The authors address an important and often overlooked aspect of potassium management in heart failure (HF), highlighting the prognostic relevance of potassium variability, independent of single-point episodes of hypo- or hyperkalemia. This study makes a meaningful contribution to the growing body of work on electrolyte dynamics in acute care. However, several methodological and clinical considerations warrant further discussion.
