Is pulmonary atresia, heart disease, and vomiting blood serious

Pulmonary atresia is

a congenital heart disease in which the pulmonary arteries do not connect properly to the heart, resulting in insufficient oxygenation of the blood. This condition increases the burden on the heart and affects blood circulation throughout the body. Hematemesis may be caused by heart failure, circulation problems, or other related complications due to pulmonary atresia.

The severity of hematemesis depends on the amount and speed of bleeding. Small amounts of hematemesis may not be immediately life-threatening, but large amounts of hematemesis may lead to severe anemia, shock, or even death. In addition, hematemesis may mask other serious health problems, such as further deterioration of heart failure.