Journal Article

Development of severe hyponatraemia in hospitalized patients: treatment-related risk factors and inadequate management

Ewout J. Hoorn, Jan Lindemans and Robert Zietse

in Nephrology Dialysis Transplantation

Published on behalf of European Renal Association - European Dialysis and Transplant Assoc

Volume 21, issue 1, pages 70-76
Published in print January 2006 | ISSN: 0931-0509
Published online September 2005 | e-ISSN: 1460-2385 | DOI: http://dx.doi.org/10.1093/ndt/gfi082
Development of severe hyponatraemia in hospitalized patients: treatment-related risk factors and inadequate management

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Background. Although hyponatraemia [plasma sodium (PNa) <136 mmol/l] frequently develops in hospital, risk factors for hospital-acquired hyponatraemia remain unclear.

Methods. Patients who presented with severe hyponatraemia (PNa ≤ 125 mmol/l) were compared with patients with hospital-acquired severe hyponatraemia in a 3 month hospital-wide cohort study.

Results. Thirty-eight patients had severe hyponatraemia on admission (PNa 121±4 mmol/l), whereas 36 patients had hospital-acquired severe hyponatraemia (PNa 133±5 → 122±4 mmol/l). In hospital-acquired hyponatraemia, treatment started significantly later (1.0±2.6 vs 9.8±10.6 days, P<0.001) and the duration of hospitalization was longer (18.2±11.5 vs 30.7±23.4 days, P = 0.01). The correction of PNa in hospital-acquired hyponatraemia was slower after both 24 h (6±4 vs 4±4 mmol/l, P = 0.009) and 48 h (10±6 mmol/l vs 6±5 mmol/l, P = 0.001) of treatment. Nineteen patients (26%) from both groups were not treated for hyponatraemia and this was associated with a higher mortality rate (seven out of 19 vs seven out of 55, P = 0.04). Factors that contributed to hospital-acquired hyponatraemia included: thiazide diuretics (none out of 38 vs eight out of 36, P = 0.002), drugs stimulating antidiuretic hormone (two out of 38 vs eight out of 36, P = 0.04), surgery (none out of 38 vs 10 out of 36, P<0.001) and hypotonic intravenous fluids (one out of 38 vs eight out of 36, P = 0.01). Symptomatic hyponatraemia was present in 27 patients (36%), and 14 patients died (19%).

Conclusions. The development of severe hyponatraemia in hospitalized patients was associated with treatment-related factors and inadequate management. Early recognition of risk factors and expedited therapy may make hospital-acquired severe hyponatraemia more preventable.

Keywords: antidiuretic hormone; hypotonic intravenous fluids; post-operative hyponatraemia; syndrome of inappropriate antidiuretic hormone secretion; thiazide diuretics; water–sodium balance

Journal Article.  4900 words.  Illustrated.

Subjects: Nephrology

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