Related Experiment Videos
Anesthetic implications of the child with homocystinuria
S Lowe1, D A Johnson, J D Tobias
1Department of Pediatrics, Vanderbilt University, Nashville, TN 37232.
Insights
This case study highlights anesthetic management for a child with homocystinuria undergoing eye surgery. Key considerations include preventing blood clots and managing blood sugar levels.
Area of Science:
- Anesthesiology
- Metabolic Disorders
- Ophthalmology
Background:
- Homocystinuria (type I) is an inherited metabolic disorder affecting amino acid metabolism, characterized by elevated methionine and homocysteine.
- This condition increases the risk of serious complications like thromboembolic events and hypoglycemia.
Observation:
- A 7 1/2-year-old girl with homocystinuria required anesthesia for bilateral ectopia lentis repair.
- The patient's condition presented specific perioperative challenges related to her metabolic disorder.
Findings:
- Effective anesthetic management necessitates strategies to mitigate risks associated with homocystinuria.
- Preventive measures for thromboembolism include dietary modifications, hydration, maintaining cardiac output, and using pneumatic stockings.
- Managing hypoglycemia involves normalizing methionine levels and administering glucose during fasting periods.
Implications:
- This case underscores the importance of tailored perioperative care for patients with metabolic disorders.
- Optimizing anesthetic protocols can improve outcomes for patients with homocystinuria undergoing surgical procedures.
- Understanding the physiological disturbances of homocystinuria is crucial for preventing perioperative complications.
Abstract:
We present a 7 1/2-year-old girl with type I homocystinuria who required anesthetic care during repair of bilateral ectopia lentis. Homocystinuria is an autosomal recessive disorder and represents the second most common error of amino acid metabolism. Defective function of the enzyme cystathionine synthetase results in elevated serum levels of methionine and homocysteine. Physiologic disturbances include an increased risk of thromboembolic events and hypoglycemia. Perioperative measures to prevent thromboembolic events include diet therapy to lower serum methionine and homocysteine levels, adequate preoperative hydration, maintenance of intraoperative cardiac output, and the use of pneumatic stockings to prevent peripheral stagnation of blood. Hypoglycemia is thought to be due to alterations in insulin release associated with high levels of circulating sulfur-containing amino acids such as methionine. Perioperative measures include normalization of serum methionine and administration of exogenous glucose during periods of fasting.