1. Observation: In some cases, a partial atrioventricular septal defect (AVSD) may be small enough that it does not require treatment. In these cases, the patient will be monitored regularly to ensure that the defect does not worsen.

2. Surgery: If the defect is large enough to cause symptoms or complications, then surgery may be recommended. During the procedure, the surgeon will close the hole in the septum and repair any other abnormalities.

3. Medication: In some cases, medications may be prescribed to help manage symptoms or reduce the risk of complications. These may include diuretics to reduce fluid buildup in the lungs, or medications to control the heart rate.