Although serum sodium levels must be monitored in all patients
treated with tolvaptan, there is a population that is prone
to be complicated with hypernatremia. In this study, we reported
3 independent predictive factors for the occurrence of hypernatremia
for the first time: serum sodium ≥142.0mEq/L, starting
dosage of tolvaptan at 15mg/day, and serum potassium