Serum sodium and osmolal changes in tuberculous meningitis

Area of Science:

• Pediatrics
• Neurology
• Infectious Diseases

Background:

• Tuberculous meningitis (TBM) is a severe infection affecting children.
• Electrolyte imbalances, particularly hyponatremia, are common complications in TBM.
• The syndrome of inappropriate antidiuretic hormone (SIADH) is a potential cause of hyponatremia in TBM.

Purpose of the Study:

• To evaluate serial serum sodium levels and osmolality in children with TBM.
• To assess the incidence and trends of hyponatremia and SIADH in TBM patients.
• To determine the correlation between SIADH, hyponatremia, and outcomes in TBM.

Main Methods:

• Serial measurements of serum sodium, CSF, serum, and urine osmolality in 20 TBM children and 20 controls.
• Investigations were performed on admission, day 3, and day 10.
• Comparison of biochemical parameters between TBM patients and controls, and assessment of SIADH presence.

Main Results:

• TBM patients showed significantly lower serum sodium and osmolality compared to controls.
• Hyponatremia was present in 65% of TBM cases on admission, decreasing to 30.8% by day 10.
• SIADH was detected in all hyponatremic TBM patients on admission, with incidence decreasing over time.

Conclusions:

• SIADH is a frequent complication in pediatric TBM, contributing to hyponatremia.
• Early diagnosis and management of SIADH are essential for appropriate fluid therapy in TBM.
• While SIADH is common, its direct correlation with mortality in survivors requires further investigation.