Overview
Ethylmalonic encephalopathy (EE) is a rare autosomal recessive disorder characterized by early-onset encephalopathy, chronic diarrhea, petechiae, orthostatic acrocyanosis, and elevated levels of lactic, ethylmalonic, and methylsuccinic acids due to mutations in the ETHE1 gene, leading to mitochondrial dysfunction and vascular damage 1.Diagnosis
Genetic Testing: Confirmatory mutations in the ETHE1 gene 1.
Biochemical Markers: Elevated levels of lactic, ethylmalonic, and methylsuccinic acids in body fluids 1.
Histological Findings: Depletion of cytochrome c oxidase (COX) in muscle and brain tissues, and diffuse vascular damage in critical organs like brain and gastrointestinal tract 1.Management
Supportive Care: Focus on managing symptoms including hydration, nutritional support, and symptomatic treatment for encephalopathy and gastrointestinal issues 1.
Monitoring: Regular assessment for complications related to vascular damage and metabolic derangements 1.Special Populations
Pediatrics: EE primarily affects children, with early onset symptoms necessitating prompt diagnosis and management 1.Key Recommendations
Genetic Confirmation: Establish diagnosis through genetic testing for ETHE1 mutations (Evidence: Strong 1).
Biochemical Screening: Include biochemical markers such as lactic, ethylmalonic, and methylsuccinic acids in diagnostic workup (Evidence: Moderate 1).
Vascular Monitoring: Regularly monitor for vascular complications in critical organs due to potential diffuse vascular damage (Evidence: Expert opinion 1).References
1 Giordano C, Viscomi C, Orlandi M, Papoff P, Spalice A, Burlina A et al.. Morphologic evidence of diffuse vascular damage in human and in the experimental model of ethylmalonic encephalopathy. Journal of inherited metabolic disease 2012. link