Hypernatremia, defined as an elevation of serum sodium >145 mEq/L, is one of the most common electrolyte disturbances in hospitalized patients and intensive care units.

In this study, the investigator aims, for the first time, to compare two strategies used for the correction of hypernatremia, using intravenous hypotonic solution compared to naso- or orogastric tube enteral water.

Hypernatremia, defined as an elevation of serum sodium >145 mEq/L, is one of the most common electrolyte disturbances in hospitalized patients and intensive care units, increasing mortality. Currently, the most effective correction strategy for hypernatremia (intravenous hypotonic solution compared to enteral water) is still a matter of debate due to a lack of evidence and clinical trials.

This study aims to determine whether the administration of intravenous hypotonic solution is more effective in the correction of hypernatremia compared to enteral water by naso- or orogastric tube. Therefore, the investigator proposes the first randomized clinical trial, which compares two strategies used for the correction of hypernatremia, with this we will determine which of the two is more effective, and we will also compare the speed of correction, renal function during hospitalization with serum creatinine and we will evaluate its safety.

Inclusion Criteria:

• Hospitalized patients with hypernatremia (serum sodium>145mEq/L).

Exclusion Criteria:

• Age below 18 years
• Pregnant, on dialysis
• Unwilling to participate or without informed consent.