Hyponatraemia in hospitalised elderly patients

Area of Science:

• Geriatrics
• Internal Medicine
• Nephrology

Background:

• Hyponatraemia is a common electrolyte imbalance in hospitalised patients.
• The elderly population is particularly vulnerable to hyponatraemia and its complications.
• Understanding the incidence and aetiology of hyponatraemia in this demographic is crucial for improving patient outcomes.

Purpose of the Study:

• To determine the incidence of hyponatraemia in hospitalised elderly patients.
• To identify the primary causes of hyponatraemia in this patient group.
• To assess the association between hyponatraemia and mortality in elderly inpatients.

Main Methods:

• Prospective observational study involving 407 new hospitalised elderly patients.
• Monitoring for episodes of hyponatraemia (serum sodium < 135 mmol/L) during hospitalisation.
• Analysis of patient records to determine the causes of hyponatraemia and compare mortality rates between hyponatraemic and normonatraemic patients.

Main Results:

• The incidence of hyponatraemia was 13.5% (55 out of 407 patients).
• Hyponatraemia was associated with a significantly higher mortality rate (27.3% vs 12.2%, p < 0.01).
• The most frequent causes were syndrome of inappropriate antidiuretic hormone secretion (SIADH), poor oral intake, and diuretic use. Lower respiratory tract infection and stroke were the leading causes of SIADH.

Conclusions:

• Hyponatraemia is a prevalent and serious condition in hospitalised elderly patients.
• Identifying and managing the underlying causes of hyponatraemia, such as SIADH, infections, and medication side effects, is critical.
• Reducing the incidence of hyponatraemia may contribute to decreased mortality in this vulnerable population.