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Helping Families that are faced with the Unimaginable Our Mission Natalias Purpose is to find a cure for Pulmonary Vein Stenosis PVS and support families with the unimaginable struggle of caring for seriously ill infants and children. 200 Families Helped 2k Financial Assistance 30k Toys Supplies Food 8 Countries Touched What is Pulmonary Vein Stenosis. Pulmonary Vein Stenosis PVS is a rare aggressive cardiovascular condition. It is recognized as being the stenosis of one or more of the pulmonary veins that return blood from the lungs to the left atrium of the heart.