Q91.2 Trisomy 18, translocation

Name of the Condition

• Trisomy 18, translocation

Summary

Trisomy 18, translocation is a chromosomal disorder resulting from an extra copy of chromosome 18 attached to another chromosome. This condition is associated with severe congenital anomalies and developmental delays. The severity of symptoms varies, but it is typically life-limiting.

Causes

Trisomy 18, translocation is caused by a chromosomal rearrangement where part of chromosome 18 is transferred to another chromosome. This error occurs randomly and is not typically inherited from parents, though rare cases may involve familial translocation.

Risk Factors

• Advanced maternal age.
• Previous pregnancy with a chromosomal abnormality.
• Family history of chromosomal disorders.

Symptoms

• Low birth weight and poor growth.
• Distinctive facial features (e.g., small head, cleft lip/palate).
• Heart defects.
• Limb abnormalities (e.g., clenched fists, overlapping fingers).
• Neurological impairments and developmental delays.

Diagnosis

Prenatal diagnosis may involve ultrasound, amniocentesis, or chorionic villus sampling (CVS) to detect chromosomal abnormalities. Postnatal confirmation is achieved through karyotyping or chromosomal microarray analysis.

Treatment Options

Management focuses on supportive care, including addressing specific organ defects (e.g., cardiac surgery), nutritional support, and monitoring for complications.

Prognosis and Follow-Up

Prognosis is poor, with most affected individuals surviving only a few months. Follow-up care involves regular monitoring for complications and supportive therapies to improve quality of life.

Complications

• Respiratory infections.
• Feeding difficulties.
• Seizures.
• Organ system failures.

Lifestyle & Prevention

• Prenatal screening and genetic counseling for at-risk families.
• Avoidance of known teratogens during pregnancy.

When to Seek Professional Help

Seek immediate medical attention for signs of respiratory distress, feeding problems, or unexplained developmental delays.

Tips for Medical Coders

Document the presence of translocation and any associated anomalies. Ensure the code Q91.2 is used when translocation is the specific cause of Trisomy 18.