Hypernatremia is the cause of too little fluid as seen with dehydration, not too much sodium caused by potassium depletion from vomiting, diarrhea, excessive administration of diuretics or sodium bicarbonate, hypernatremia is a serious electrolyte imbalance after surgical repair of the heart, it can cause significant neurological, endocrine and cardiac disturbances,

hypernatremia causes a shift of water out of cells making the cells dehydrated.(9,10,11).