Acidosis in severe childhood malaria

Area of Science:

• Pediatrics
• Infectious Diseases
• Critical Care Medicine

Background:

• Severe malaria is a significant cause of mortality in children.
• Metabolic acidosis is a common complication of severe malaria.
• Understanding the pathophysiology of severe malaria complications is crucial for improving outcomes.

Purpose of the Study:

• To investigate the clinical and biochemical characteristics of severe malaria in Kenyan children.
• To identify factors associated with metabolic acidosis and mortality in severe malaria.
• To explore the pathophysiological mechanisms underlying coma and respiratory distress in severe malaria.

Main Methods:

• Prospective data collection on 306 Kenyan children with severe malaria.
• Analysis of blood gases, renal function markers (urea, creatinine), plasma osmolality, lactate, and hemoglobin levels.
• Comparison of clinical and biochemical parameters between children with different clinical presentations (coma, respiratory distress, or both).

Main Results:

• Severe malaria caused high-anion-gap metabolic acidosis in at least 43% of children.
• Children with both coma and respiratory distress (CM + RD) exhibited greater renal dysfunction, lower pH, higher plasma osmolality, and higher blood lactate compared to isolated findings.
• Children with CM + RD had lower hemoglobin, were younger, and accounted for 63% of all deaths.

Conclusions:

• Hypovolemia and renal impairment are implicated in the pathogenesis of metabolic acidosis in severe childhood malaria.
• Anemia is associated with lactic acidosis in acidotic children, potentially contributing to its pathogenesis.
• Coma in acidotic children (CM + RD) and isolated encephalopathy (CM) may arise from different pathophysiological mechanisms.