E74.19

Clinical Causes: Genetic mutations affecting enzymes involved in fructose metabolism Deficiency of the enzyme fructose-1,6-diphosphatase Inheritance in an autosomal recessive pattern, meaning both parents contribute a defective gene

Key Symptoms: Severe hypoglycemia (low blood sugar levels) Nausea and vomiting during fasting or after consuming fructose-rich foods Jaundice (yellowing of the skin and eyes) Lethargy or fatigue Enlarged liver (hepatomegaly) Muscle weakness Poor growth in infants and children Potential episodes of metabolic crisis, especially during illness or fasting

Diagnosis Path: Diagnosing disorders of fructose metabolism involves a combination of clinical evaluation and laboratory testing. Key diagnostic steps include: - Blood tests to measure glucose and metabolites during fasting and after fructose intake - Genetic testing to identify mutations in relevant genes - Enzyme activity assays in liver tissue or cultured cells - Imaging studies like ultrasound to assess liver size and structure Early recognition through characteristic symptoms and confirmatory laboratory testing are critical for accurate diagnosis.

Treatment Protocols: Management of these metabolic disorders typically focuses on preventing hypoglycemia and minimizing fructose intake. Treatment strategies may include: - Strict dietary restriction of fructose, sucrose, and sorbitol - Regular monitoring of blood glucose and metabolic status - Providing glucose during illness or fasting periods to prevent hypoglycemia - Nutritional counseling to ensure adequate caloric intake without triggering symptoms - In some cases, enzyme replacement therapies or supportive treatments may be explored Long-term management requires close coordination with healthcare providers familiar with metabolic disorders to prevent complications and promote optimal health.