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Echo can show the pattern of blood flow through the septal openings, and determine how large the openings are, as well as how much blood is passing through them. The vast majority of av canal defects are diagnosed by echocardiography alone. Cardiac catheterization. â a cardiac catheterization is an invasive procedure that gives very detailed information about the structures inside the heart. Under sedation, a small, thin, flexible tube (catheter) is inserted into a blood vessel in the groin, and guided to the inside of the heart. Blood pressure and oxygen measurements are taken in the four chambers of the heart, as well as the pulmonary artery and aorta. Contrast dye is also injected to more clearly visualize the structures inside the heart. Cardiac catheterization is recommended prior to av canal repair if pulmonary hypertension (high blood pressure in the vessels of the lungs) is suspected or if other information is desired. Cardiac catheterization is typically not necessary if surgical repair of av canal defects occurs before six months of age (in down syndrome children) or before one year of age (in non-down syndrome children). Treatment for atrioventricular canal specific treatment for atrioventricular canal will be determined by your child's physician based on: your child's age, overall health, and medical history extent of the disease your child's tolerance for specific medications, procedures, or therapies expectations for the course of the disease your opinion or preference av canal is treated by surgical repair of the defects. However, medical support (i. E. , medications) may be necessary until the operation is performed. Treatment may include: medical management. Many children will eventually need to take medications to help the heart and lungs work better, due to strain from the extra blood passing through the septal defects. Medications that may be prescribed include the following: digoxin. buy viagra online viagra for sale buy generic viagra cheap generic viagra cheap viagra cheapest generic viagra online viagra online buy viagra online buy cheap viagra buying generic viagra online â helps strengthen the heart muscle, enabling it to pump more efficiently. Diuretics. â the body's water balance can be affected when the heart is not working as well as it could. These medications help the kidneys remove excess fluid from the body. Ace (angiotensin-converting enzyme) inhibitors. â dilates the blood vessels, making it easier for the heart to pump blood forward into the body. Adequate nutrition. Infants may become tired when feeding, and may not be able to eat enough to gain weight. Options that can be used to ensure your baby will have adequate nutrition include: high-calorie formula or breast milk. Special nutritional suppleme.