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    Total anomalous pulmonary venous return

    TAPVR; Total veins

    Total anomalous pulmonary venous return is aheart disease that is present at birth (congenital heart disease) in which none of the four veins that take blood from the lungs to the heart is attached to the left atrium (left upper chamber of the heart).

    Causes

    The cause of total anomalous pulmonary venous return (TAPVR) is unknown.

    In normal circulation, blood is sent from the right ventricle to pick up oxygen in the lungs. It then returns through the pulmonary (lung) veins to the left side of the heart, which sends blood out through the aorta and around the body.

    In TAPVR, oxygen-rich blood returns from the lungs to the right atrium or to a vein flowing into the right atrium, instead of the left side of heart. In other words, blood simply circles to and from the lungs and never gets out to the body.

    Forthe infantto live, a large atrial septal defect (ASD) or patent foramen ovale (passage between the left and right atria) must exist to allow oxygenated blood to flow to the left side of the heart and the rest of the body.

    How severe this condition isdepends on whether the pulmonary veins are blocked. The pulmonary veins may run into the abdomen, passing through a muscle (diaphragm). This muscle squeezes the veins and narrows them, causing the blood to back up into the lungs. This type of TAPVR causes symptoms early in life and can be deadly very quicklyif it isnot found and corrected with surgery.

    Symptoms

    The infant may appear very sick and may have the following symptoms:

    • Bluish color of the skin (cyanosis)
    • Frequent respiratory infections
    • Lethargy
    • Poor feeding
    • Poor growth
    • Rapid breathing  

    Note: Sometimes, no symptoms may be present in infancy or early childhood.

    Exams and Tests

    • Cardiac catheterization can confirm the diagnosis by showing that the blood vessels are abnormally attached
    • ECG shows enlargement of the ventricles (ventricular hypertrophy)
    • Echocardiogram may show that the pulmonary vessels are attached
    • MRI of the heart can show the connections between the pulmonary vessels
    • X-ray of the chest shows a normal to small heart with fluid in the lungs

    Treatment

    Surgery to repair the problem is needed as soon as possible. In surgery, the pulmonary veins are connected to the left atrium and the defect between the right and left atrium is closed.

    Outlook (Prognosis)

    If this condition is not treated, the heart will get larger, leading to heart failure. Repairing the defect early provides excellent results if there is no blockage of the pulmonary veins at the new connection into the heart.

    Possible Complications

    • Breathing difficulties
    • Heart failure
    • Irregular, fast heart rhythms (arrhythmias)
    • Lung infections
    • Pulmonary hypertension

    When to Contact a Medical Professional

    This condition may be apparent at the time of birth. However, symptoms may not be present until later.

    Call your health care provider if you notice symptoms of TAPVR -- prompt attention is required.

    Prevention

    There is no known way to prevent TAPVR.

    References

    Webb GD, Smallhorn JF, Therrien J, Redington AN. Congenital heart disease. In: Bonow RO, Mann DL, Zipes DP, Libby P, eds. Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, 9th ed. Philadelphia, Pa:Saunders Elsevier; 2011:chap 65.

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            Tests for Total anomalous pulmonary venous return

              Review Date: 12/1/2011

              Reviewed By: Kurt R. Schumacher, MD, Pediatric Cardiology, University of Michigan Congenital Heart Center, Ann Arbor, MI. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

              The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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