[Moderate potentially drug-induced hyponatremia in older adults: benefit in drug reduction]

This study aimed at evaluating the benefit of changing drug therapy in elderly patients with moderate, potentially drug-induced hyponatremia.

Hospitalized older adults, with moderate hyponatremia, potentially induced by drugs, were randomized into two arms: an interventional group, whose drug therapy was changed, and a reference group, which received standard care. The effectiveness of the intervention was evaluated by the normalization of serum sodium after four weeks and by the incidence of falls three months later.

Nineteen patients were randomized, fourteen evaluated at 4 weeks. Serum sodium was normalized more frequently in the interventional group than in the reference group: 75% (6/8) IC95% [35-97] versus 0% (0/6) IC95% [0-46]; p=0.01. A greater reduction in falls occurred in the therapeutic intervention group 75% (3/4) IC95% [19-99] versus 0% (0/5) IC95% [0-52]; p=0.048.

This study showed the biological and clinical benefit of a pharmalogical intervention. Registration number of the study: ID RCB 2010-A00778-31.