Interní Med. 2012; 14(8-9): 312-317
Hyponatremie (pokles koncentrace Na+ v séru pod dolní mez příslušené laboratorní metody – obvykle 135–137 mmol/l) je velmi častá
laboratorní odchylka. I asymptomatická hyponatremie může být riziková a je spojena s vyšší morbiditou a mortalitou. Pro správnou diagnózu
musíme vždy zhodnotit osmolalitu a tonicitu séra, objem extracelulární tekutiny a koncentraci Na+ ve vzorku moči. Akutní těžká
hyponatremie (
Hyponatremia (decreased serum Na+ bellow low limit of a laboratory method – usually 135–137 mmol/l) is frequent abnormality. Even
asymptomatic, hyponatremia is linked with increased morbidity and mortality. Correct diagnosis is based on evaluation of serum osmolality
and tonicity, volume of extracellular fluid and concentration of Na+ in urine. Acute severe hyponatremia (<120 mmol/l) must
be treated with hypertonic saline immediately. Chronic hyponatremia should be treated with respect on its type (hypo-, eu- and hypervolemic
hyponatremia) and cause. Rapid correction of chronic hyponatremia can lead to osmotic brain demyelination. If hypervolemic
hyponatremia (chronic heart failure, liver cirrhosis and nephrotic syndrome) is excluded, one half of cases of hyponatremia are caused by
SIADH (syndrome of inappropriate antidiuretic hormone secretion). Therapy of SIADH is based on fluid restriction. If this is not effective
or is not tolerated by patient, vaptans (vasopressin V2 receptor antagonists in kidneys) can be used.
Zveřejněno: 20. září 2012 Zobrazit citaci