Establishment of an Algorithm for a Clinical Classfication of Hypoosmolar Hyponatremia

The prospective clinical diagnosis of hyponatremia is often very difficult- but requirement for an appropriate and riskless treatment of hyponatremia. This study try to establish an algorithm handling a prospective clinical categorization of hyponatremia and approving together the start of an appropriate symptomatic therapy.

Inclusion Criteria:

• hypoosmolar hyponatremia with serum sodium concentration ≤129 mmol/l and serum osmolality ≤ 280 mosm/kg;
• age > 18 years;
• letter of agreement.

Exclusion Criteria:

• gravidity and lactation;
• restricted decision-making-ability