Severe hyponatraemia (P-Na < 116 mmol/l) in the emergency department: a series of 394 cases

Aim: To evaluate the significance of severe hyponatraemia presented at the emergency department (ED). Methods: A retrospective hospitalrecords study of all patients with plasma sodium levels of < 116 mmol/l from 2016 to 2020 in a single tertiary referral centre. Results: A total of 394 visits of 363 individual severely hyponatraemic patients represented 0.08% of all ED visits. Themean age was 68 years and the male-to-female ratio was 1:1.3. The symptoms and signs were diffuse and varying, while half ofthe patients had neurologic symptoms. The aetiology of hyponatraemia was often multifactorial. The aetiologies varied by age,and the most common ones were the syndrome of inappropriate antidiuresis (34%), diuretic use (27%), alcohol-related (19%)and dehydration (19%). The mean sodium correction rates were 6.6, 4.9 and 3.8 mmol/l/24 h at 24, 48 and 72 h, respectively.The mean maximum correction rate over any 24-h time interval was 10.2 mmol/l. The vital signs (National Early WarningScore, NEWS) of severely hyponatraemic patients were mostly normal. All-cause mortality was 18% for 1-year follow-up.Malignancies, especially small-cell lung cancer, and end-stage liver disease caused most of the deaths. Osmotic demyelinationsyndrome (ODS) was diagnosed in five (1.4%) patients. Conclusion: Patients with severe hyponatraemia in the ED presented with non-specific complaints. The aetiology of hyponatraemia was often multifactorial and varied by age. The needfor intensive care was poorly predicted by NEWS. The one-year mortality rate was 18% and the incidence of ODS 1.4% afteran episode of severe hyponatraemia.