Q21.2 Atrioventricular septal defect

Name of the Condition

• Atrioventricular septal defect

Summary

Atrioventricular septal defect (AVSD) is a congenital heart defect involving abnormalities in the atrioventricular septum, which separates the atria and ventricles. This defect disrupts normal blood flow between the heart chambers and may involve malformations of the atrioventricular valves. The condition can vary in severity, affecting cardiac function and oxygenation.

Causes

AVSD results from errors in cardiac development during fetal growth. While specific causes are often not identifiable, genetic factors and environmental influences, such as maternal exposure to certain substances or infections during pregnancy, may contribute to its occurrence.

Risk Factors

• Family history of congenital heart defects.
• Maternal conditions like diabetes or lupus during pregnancy.
• Exposure to teratogens (e.g., alcohol, certain medications) in utero.
• Chromosomal abnormalities (e.g., Down syndrome).

Symptoms

• Heart murmur (detected during physical examination).
• Shortness of breath or rapid breathing.
• Fatigue, especially during feeding or activity.
• Poor growth or weight gain in infants.
• Cyanosis (bluish skin) in severe cases.

Diagnosis

Diagnosis typically involves physical examination, echocardiography (ultrasound of the heart), and electrocardiography (ECG) to assess heart structure and function. Additional imaging or cardiac catheterization may be used for detailed evaluation.

Treatment Options

Treatment depends on defect severity and may include medical management for symptoms, surgical repair to correct structural abnormalities, and ongoing monitoring. In some cases, multiple procedures or lifelong care may be necessary.

Prognosis and Follow-Up

Prognosis varies based on defect severity, timing of intervention, and associated conditions. Regular follow-up with a cardiologist is essential to monitor cardiac function, manage complications, and adjust treatment as needed.

Complications

• Heart failure due to increased workload on the heart.
• Pulmonary hypertension from abnormal blood flow.
• Arrhythmias (irregular heart rhythms).
• Increased risk of infections like endocarditis.

Lifestyle & Prevention

• Prenatal care to manage maternal health and reduce risk factors.
• Avoiding teratogens (e.g., alcohol, certain medications) during pregnancy.
• Genetic counseling for families with a history of congenital heart defects.

When to Seek Professional Help

Seek immediate medical attention if symptoms like severe shortness of breath, cyanosis, or poor feeding occur. Routine follow-up is necessary for ongoing management of the condition.

Tips for Medical Coders

Document the specific type and severity of the atrioventricular septal defect, including any associated anomalies or interventions. Ensure clinical details support the diagnosis and align with coding guidelines for congenital heart defects.