Ventricular Septal Defect (cont.)

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How do VSDs cause problems?

The pressure generated during contraction by the left ventricle is higher than that generated by the simultaneous contraction of the right ventricle. Blood will thus be pushed through the VSD (also called "shunted") from the left ventricle to the right ventricle. The right ventricle has to do extra work to handle the additional blood volume. It may have trouble keeping up with the load and enlarge, affecting its ability to pump efficiently. In addition, the lungs receive too much blood under too much pressure. The arterioles (small arteries) in the lungs thicken in response to the excess blood under excess pressure. If this extra pressure persists, permanent damage can be done to the lungs.

It makes a considerable difference whether the size of the VSD is small or large.

How is a VSD diagnosed? What are the symptoms of a VSD?

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The diagnosis of a VSD is usually suspected clinically by hearing a characteristic heart murmur. A murmur is a sound generated by abnormally turbulent flow of blood through the heart. This murmur is the result of blood being shunted through the VSD from the higher-pressure left ventricle into the lower-pressure right ventricle. At birth, this pressure imbalance is minimal and does not usually develop until later in the first week of life. As such, it is rare for a doctor to hear the murmur of a VSD until the baby is a few days of age.

The evaluation of a child with a possible VSD is designed to confirm the diagnosis but also to check for other anatomical defects in the heart and to estimate the size of the shunt of blood from the left to right ventricle.

Such an evaluation usually begins with an electrocardiogram (EKG, sometimes also abbreviated ECG) and possibly a chest X-ray. A soundwave test of the heart (echocardiogram) is used to define the anatomy and evaluate the characteristics (amount and pressures) of the shunted blood. With the advent of superb echocardiography, the previously required cardiac catheterization is rarely necessary.

Medically Reviewed by a Doctor on 1/14/2014

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