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Complete Common Atrioventricular Canal Defect, also known as Atrioventricular Septal Defect, is a lack of separation of the atria and the ventricles into separate right and left chambers as well as a lack of separation of the mitral and tricuspid valves. The lack of separation of these two valves results in a single atrioventricular valve.
In patients with atrioventricular canal defect, the single atrioventricular may not close properly. Therefore, the heart must pump an excessive amount of blood and this may result in an enlargement of the heart.
Surgical repair for atrioventricular canal defect is required within the first six months of life. The surgery involves sewing patches over the ASD and VSD and carefully separating the single atrioventricular valve into two valves.
How Does Atrioventricular Canal Defect Differ From
Normal Cardiac Anatomy?
If your child has atrioventricular canal defect the structure of his or her heart is different from normal cardiac anatomy.
Heart With Normal Cardiac Anatomy
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When your child has a congenital heart defect, there's usually something wrong with the structure of his or her heart's structure.
The heart is composed of four chambers. The two upper chambers, known as atria, collect blood as it flows back to the heart. The two lower chambers, known as ventricles, pump blood with each heartbeat to the two main arteries (the pulmonary artery and the aorta). The septum is the wall that divides the heart into right and left sides. The atrial septum separates the right and left atria; likewise, the ventricular septum separates the two ventricles.
There are four valves that control the flow of blood through the heart. These flap-like structures allow blood to flow in only one direction. The tricuspid and mitral valves, also known as the atrioventricular valves, separate the upper and lower chambers of the heart. The aortic and pulmonary valves, also known as the arterial valves, separate the ventricles from the main arteries. Oxygen-depleted blood returns from the body and drains into the right atrium via the superior and inferior vena cavas. The blood in the right atrium then passes through the tricuspid valve and enters the right ventricle.
Next, the blood passes through the pulmonary valve, enters the pulmonary artery, and travels to the lungs where it is replenished with oxygen. The oxygen-rich blood returns to the heart via the pulmonary veins, draining into the left atrium. The blood in the left atrium passes through the bicuspid, or mitral, valve and enters the left ventricle.
Finally, the oxygen-rich blood flows through the aortic valve into the aorta and out to the rest of the body.
From Nemours' KidsHealth
- Cardiac Catheterization
- ECG (Electrocardiogram)
- If Your Child Has a Heart Defect
- Atrial Septal Defect
- When Your Child Needs a Heart Transplant
- Heart Murmurs
- Patent Ductus Arteriosus (PDA)
- Coarctation of the Aorta
- Congenital Heart Defects
- Ventricular Septal Defect
- Tetralogy of Fallot
- A to Z: Atrial Flutter
- A to Z: Hypoplastic Left Heart Syndrome
- A to Z: Patent Ductus Arteriosus (PDA)
- A to Z: Tetralogy of Fallot
- Heart and Circulatory System
- Congenital Heart Defects Special Needs Factsheet
Trusted External Resources
A to Z: Atrial Flutter
A to Z: Atrial Flutter
More to Know
The electrical impulse that keeps the heart beating normally begins at a group of cells called the sinus node, located in the right atrium (one of the heart's upper chambers). With atrial flutter, however, the electrical impulse begins in a circuit that moves throughout the right atrium and causes the heart to beat rapidly and abnormally.
A rapid heartbeat can stress the heart and cause chest pain, palpitations, shortness of breath, fatigue, and low blood pressure.
Atrial flutter is often caused by damage to the heart or by congenital (present at birth) heart defects. Other causes include certain medications, viral infections, and metabolic disorders. In some cases, it happens for no apparent reason. It can also come and go.
A rapid heartbeat can increase the risk of stroke or heart disease, so should be treated. Treating the cause of atrial flutter can usually restore a normal heart rate. Medications can also help slow the heart or thin the blood to reduce the risk of stroke.
Keep in Mind
Though it can be serious, if atrial flutter is treated properly, most people can live perfectly normal lives, although some may have a relapse of the condition from time to time.
All A to Z dictionary entries are regularly reviewed by KidsHealth medical experts.
Date reviewed: September 05, 2017