Pulmonary atresia (uh-TREE-zhuh) is a heart defect present at birth (congenital) that's normally diagnosed within the first few hours or days of life. In pulmonary atresia, the valve that lets blood out of the heart to go to your baby's lungs (pulmonary valve) doesn't form correctly.
Instead of opening and closing to allow blood to travel from the heart to the lungs, a solid sheet of tissue forms. So blood can't travel by its normal route to pick up oxygen from the lungs. Instead, some blood travels to the lungs through other natural passages within the heart and its arteries.
These passages are necessary when your baby is developing in the womb and they normally close soon after birth. Babies with pulmonary atresia typically have a bluish cast to their skin because they aren't getting enough oxygen.
Pulmonary atresia is a life-threatening situation. Procedures to correct your baby's heart condition and medications to help your baby's heart work more effectively are the first steps to treat pulmonary atresia.
Source: http://www.mayoclinic.com
If your baby is born with pulmonary atresia, symptoms will be noticeable soon after birth. Pulmonary atresia symptoms may show up within hours to several days. Your baby's signs and symptoms may include:
Your baby will most likely be diagnosed with pulmonary atresia within the first few hours to the first few days of life. However, if your baby has any symptoms of pulmonary atresia after you've returned home, seek emergency medical attention.
Source: http://www.mayoclinic.com
There is no known cause of pulmonary atresia. It's thought that the problems that cause pulmonary atresia begin early in the pregnancy. To understand the problems pulmonary atresia causes, it's helpful to know how the heart works.
The heart is divided into four hollow chambers, two on the right and two on the left. In performing its basic job â pumping blood throughout the body â the heart uses its left and right sides for different tasks.
The right side of the heart moves blood to the lungs through vessels called pulmonary arteries. In the lungs, blood picks up oxygen then returns to the heart's left side through the pulmonary veins. The left side of the heart then pumps the blood through the aorta and out to the rest of the body to supply your baby's body with oxygen.
Blood moves through your baby's heart in one direction through valves that open and close as the heart beats. The valve that allows blood out of your baby's heart and into the lungs to pick up oxygen is called the pulmonary valve.
In pulmonary atresia, the pulmonary valve doesn't develop properly, preventing it from opening. Blood can't flow from the right ventricle to the lungs.
Before birth, the improperly formed valve isn't life-threatening, because the placenta provides oxygen for your baby instead of the lungs. Blood entering the right side of your baby's heart passes through a hole (foramen ovale) between the top chambers of your baby's heart, so the oxygen-rich blood can be pumped out to the rest of your baby's body through the aorta.
After birth, your baby's lungs must provide oxygen for his or her body. In pulmonary atresia, without a working pulmonary valve, blood must find another route to reach your baby's lungs.
The foramen ovale usually shuts soon after birth, but may stay open in pulmonary atresia. Newborn babies also have a temporary connection (ductus arteriosus) between the aorta and the pulmonary artery.
This passage allows some of the oxygen-poor blood to travel to the lungs where it can pick up oxygen to supply your baby's body. The ductus arteriosus normally closes within a few hours or days after birth, but can be kept open with medications.
In some cases, there may be a second hole in the tissue that separates the main pumping chambers of your baby's heart, called a ventricular septal defect (VSD).
The VSD allows a pathway for blood to pass through the right ventricle into the left ventricle. Children with pulmonary atresia and a VSD often have additional abnormalities of the lungs and the arteries that bring blood to the lungs. If there's no VSD, the right ventricle receives little blood flow before birth and often doesn't develop fully. This is a condition called pulmonary atresia with intact ventricular septum (PA/IVS).
Source: http://www.mayoclinic.com
Tests to diagnose pulmonary atresia may include:
Source: http://www.mayoclinic.com
Without treatment, pulmonary atresia is nearly always fatal. Even after surgical repairs, you'll need to carefully monitor your child's health for any changes that could signal a problem.
People with structural heart problems, such as pulmonary atresia, are at a higher risk of infectious endocarditis than the general population. Infectious endocarditis is an inflammation of the valves and inner lining of the heart caused by a bacterial infection.
Source: http://www.mayoclinic.com
Because the exact cause of pulmonary atresia is unknown, it may not be possible to prevent it. However, there are some things you can do that might reduce your child's overall risk of congenital heart defects, such as:
Source: http://www.mayoclinic.com
If your baby is born with pulmonary atresia, it may seem that almost all your time is spent at the hospital or at a doctor's office. But there will be time spent at home, as well. Here are some tips for caring for your child at home:
Source: http://www.mayoclinic.com
It's natural for many parents to feel worried about their child's health, even after treatment of a congenital heart defect. Although many children who have congenital heart defects can do the same things children without heart defects can, here are a few things to keep in mind if your child has a congenital heart defect:
Source: http://www.mayoclinic.com
In most cases, the exact cause of a congenital heart defect, such as pulmonary atresia, is unknown. However, several factors may increase the risk of a baby being born with a congenital heart defect, including:
Source: http://www.mayoclinic.com
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