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Hyponatraemia in Emergency Medical Admissions-Outcomes and Costs
#MMPMID26237600
Conway R
; Byrne D
; O'Riordan D
; Silke B
J Clin Med
2014[Oct]; 3
(4
): 1220-33
PMID26237600
show ga
Healthcare systems in the developed world are struggling with the demand of
emergency room presentations; the study of the factors driving such demand is of
fundamental importance. From a database of all emergency medical admissions
(66,933 episodes in 36,271 patients) to St James' Hospital, Dublin, Ireland, over
12 years (2002 to 2013) we have explored the impact of hyponatraemia on outcomes
(30 days in-hospital mortality, length of stay (LOS) and costs). Identified
variables, including Acute Illness Severity, Charlson Co-Morbidity and Chronic
Disabling Disease that proved predictive univariately were entered into a
multivariable logistic regression model to predict the bivariate of 30 days
in-hospital survival. A zero truncated Poisson regression model assessed LOS and
episode costs and the incidence rate ratios were calculated. Hyponatraemia was
present in 22.7% of episodes and 20.3% of patients. The 30 days in-hospital
mortality rate for hyponatraemic patients was higher (15.9% vs. 6.9% p < 0.001)
and the LOS longer (6.3 (95% CI 2.9, 12.2) vs. 4.0 (95% CI 1.5, 8.2) p < 0.001).
Both parameters worsened with the severity of the initial sodium level. Hospital
costs increased non-linearly with the severity of initial hyponatraemia.
Hyponatraemia remained an independent predictor of 30 days in-hospital mortality,
length of stay and costs in the multi-variable model.
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