D82.1 Di George's syndrome

Name of the Condition

• Di George's syndrome

Summary

Di George's syndrome is a primary immunodeficiency disorder characterized by the absence or underdevelopment of the thymus and parathyroid glands, leading to immune system dysfunction and hypocalcemia. The condition often involves congenital heart defects and facial abnormalities, and it results from a chromosomal deletion affecting the 22q11.2 region.

Causes

Di George's syndrome is caused by a microdeletion on chromosome 22q11.2, which disrupts the development of the third and fourth pharyngeal pouches during embryogenesis. This genetic abnormality impairs the formation of the thymus, parathyroid glands, and parts of the heart and facial structures.

Risk Factors

• Chromosomal 22q11.2 deletion
• Family history of Di George's syndrome or related congenital disorders
• Advanced parental age (potential association with de novo mutations)

Symptoms

• Recurrent or severe infections due to T-cell deficiency
• Hypocalcemia (low blood calcium) causing muscle spasms or seizures
• Congenital heart defects (e.g., tetralogy of Fallot, ventricular septal defect)
• Distinctive facial features (e.g., low-set ears, cleft palate, wide-set eyes)
• Developmental delays or learning disabilities

Diagnosis

Diagnosis is based on clinical features, genetic testing for the 22q11.2 deletion, and laboratory findings (e.g., low T-cell counts, hypocalcemia). Imaging may confirm thymic or cardiac abnormalities, and immunological testing evaluates immune function.

Treatment Options

Treatment focuses on managing symptoms and complications, including calcium and vitamin D supplementation for hypocalcemia, antibiotics for infections, and surgical repair of heart defects. Immunoglobulin replacement or thymus transplantation may be considered for severe immune deficiencies.

Prognosis and Follow-Up

Prognosis varies depending on the severity of organ involvement and immune dysfunction. Regular monitoring of calcium levels, cardiac function, and immune status is essential. Early intervention improves outcomes, and multidisciplinary care (e.g., immunology, cardiology, endocrinology) is often required.

Complications

• Severe or life-threatening infections due to immune deficiency
• Hypocalcemic crises (e.g., seizures, cardiac arrhythmias)
• Progressive heart disease or surgical complications
• Autoimmune disorders (e.g., autoimmune cytopenias)
• Developmental or behavioral challenges

Lifestyle & Prevention

• Maintain regular medical follow-up for monitoring and treatment adjustments
• Practice good hygiene to reduce infection risk
• Ensure adequate calcium and vitamin D intake as prescribed
• Address developmental or educational needs with specialized support
• Avoid live vaccines in cases of severe T-cell deficiency (per clinical guidance)

When to Seek Professional Help

Seek immediate medical attention for symptoms of hypocalcemia (e.g., muscle spasms, seizures) or severe infections. Consult a healthcare provider for unexplained fatigue, recurrent illnesses, or concerns about developmental delays.

Tips for Medical Coders

Document the presence of immunodeficiency, congenital anomalies (e.g., cardiac defects, facial features), and genetic confirmation of the 22q11.2 deletion. Include details on thymic or parathyroid involvement, as these are key diagnostic criteria. Ensure coding aligns with the specific manifestations documented in the medical record.