Eriguchi R, Obi Y, Soohoo M, et al. - Researchers sought to determine the association of serum potassium levels with all-cause and arrhythmia-related deaths across race/ethnicity among peritoneal dialysis (PD) patients. From a large US dialysis organization, 17,664 patients who started PD between January 1, 2007, and December 31, 2011, were included for this work. As per findings, Hispanics displayed the highest baseline serum potassium levels (4.2 ± 0.7 mEq/L) and non-Hispanic blacks displayed the lowest baseline serum potassium levels (4.0 ± 0.7 mEq/L). During the follow-up of median 2.2 (interquartile ranges 1.3–3.2) years, 2,949 deaths were observed; of these, 683 (23%) were arrhythmia-related deaths. Among incident PD patients, there was a consistent relationship between hypokalemia and all-cause and arrhythmia-related deaths; race/ethnicity did not affect this relationship. However, while there was a correlation of hyperkalemia with both death outcomes in non-Hispanic blacks and whites, it did not correlate with either death outcome in Hispanic patients.