E71.3

Clinical Causes: Inherited genetic mutations affecting enzymes involved in fatty acid breakdown Deficiencies in specific enzymes necessary for fatty acid oxidation Mutations affecting proteins responsible for transporting fatty acids into cell mitochondria Rare metabolic syndromes that disrupt normal fatty acid processing

Key Symptoms: Episodes of hypoglycemia (low blood sugar), especially during fasting or illness Muscle weakness or pain, particularly during exercise Learning difficulties or developmental delays in some cases Lethargy and fatigue Difficulty tolerating fasting Hepatomegaly (enlarged liver) Unusual smell or odor in urine or sweat due to unmetabolized fatty acids Signs of metabolic crisis such as vomiting, breathing difficulties, or coma during episodes

Diagnosis Path: Diagnosing fatty acid metabolism disorders typically involves a combination of clinical evaluation and specialized laboratory tests. Blood and urine analyses can detect abnormal levels of fatty acids or alternative metabolites indicative of metabolic disruption. Confirmatory testing often includes genetic analysis to identify specific mutations. Additionally, enzyme activity assays can help determine which part of the fatty acid oxidation pathway is impaired. Healthcare providers may also recommend fasting tests under supervision to observe abnormal metabolic responses.

Treatment Protocols: Dietary modifications: Implementing a low-fat, high-carbohydrate diet to reduce reliance on fatty acid oxidation Avoiding fasting periods: Regular, timed meals to maintain stable blood sugar levels Supplementation: Use of medium-chain triglycerides (MCTs) which can be easier to metabolize Emergency protocols: Having plans and medications ready for metabolic stress or crisis Monitoring: Regular follow-up with healthcare providers for assessment and adjustment of treatment plan Genetic counseling: To inform affected families about inheritance patterns and future planning