What Is Pulmonary Atresia in Children? Pulmonary atresia is a condition in which the pulmonary valve, located between the right ventricle of the heart and the pulmonary artery that carries blood to the lungs, fails to form an open passage from birth. In a normal heart, oxygen-poor blood is sent from the right ventricle to the lungs through the pulmonary valve. The blood that is oxygenated in the lungs then returns to the left side of the heart and is pumped to the whole body. In pulmonary atresia, the pulmonary valve is completely closed. For this reason, blood cannot pass from the right ventricle to the lungs by the normal route. Blood may reach the lungs through vascular connections such as the ductus arteriosus, which can stay open after birth, or, in some patients, through alternative vessels that have developed. Pulmonary atresia is a critical congenital heart disease that requires urgent evaluation and treatment, especially in the newborn period. Why Does Pulmonary Atresia Occur? Pulmonary atresia arises during the baby's heart development in the womb. The exact cause of the disease is unknown in most cases. It may be associated with some genetic changes and with other congenital heart anomalies. Impaired development of the pulmonary valve can also affect the development of the right ventricle and the pulmonary arteries. The severity of the disease varies according to the accompanying heart anomalies and the structure of the vessels that supply blood to the lungs. What Are the Types of Pulmonary Atresia? Pulmonary atresia is evaluated in different groups according to the accompanying structural abnormalities in the heart. 1. Pulmonary Atresia with Intact Ventricular Septum (PA/IVS) In this type, there is no hole between the two ventricles of the heart. The right ventricle may be small and underdeveloped. Structural abnormalities may also be seen in the tricuspid valve. In some babies, there may be abnormal connections between the coronary vessels of the heart and the right ventricle. This significantly affects the treatment plan. 2. Pulmonary Atresia with Ventricular Septal Defect (PA/VSD) In this type, pulmonary atresia is accompanied by an opening between the two ventricles of the heart. Blood flow to the lungs may be provided through the ductus arteriosus or, in some patients, through collateral vessels arising from the aorta. Treatment is planned according to the development of the pulmonary arteries and the vascular anatomy. What Are the Symptoms of Pulmonary Atresia in Newborns? In babies with pulmonary atresia, symptoms usually appear in the first hours or days after birth. The most common symptoms are: - Bluish discoloration of the lips and skin - Low blood oxygen levels - Rapid breathing - Feeding difficulty - Tiring quickly - Weakness and excessive sleepiness - Inadequate weight gain - Circulatory disturbance in severe cases In particular, when the ductus arteriosus begins to close, the amount of blood going to the lungs can decrease severely. This can cause a sudden drop in the baby's oxygen level. Important: Marked bluish discoloration, serious breathing difficulty, or impaired consciousness in a newborn requires urgent medical help. How Is Pulmonary Atresia Diagnosed? Pulmonary atresia can be detected in some babies during pregnancy by fetal echocardiography. Prenatal diagnosis helps in planning for the baby to be born at a center with the appropriate equipment. The main diagnostic methods used after birth are: 1. Echocardiography (ECHO) The structure of the pulmonary valve, the development of the right ventricle, openings within the heart, and blood flow are evaluated. 2. Oxygen Saturation Measurement The oxygen level in the blood is checked. 3. Electrocardiography (ECG) Heart rhythm and the electrical activity of the heart chambers are examined. 4. Cardiac CT or MRI It can be used for detailed evaluation of the pulmonary arteries and other vascular connections. 5. Cardiac Catheterization It may be performed to evaluate pressures within the heart, the vascular anatomy, and, in some patients in particular, the coronary vessel connections. How Is Initial Treatment Carried Out in Pulmonary Atresia? In newborns diagnosed with pulmonary atresia, the first aim is to ensure adequate blood flow to the lungs and to stabilize the baby's circulation. Prostaglandin E1 Treatment It may be given to keep the ductus arteriosus open. In many cases of pulmonary atresia, this vascular connection is vital for blood to reach the lungs. Newborn Intensive Care Support The baby's oxygen level, breathing, heart rhythm, and circulation are closely monitored. When necessary, respiratory support and other intensive care treatments are given. After the initial treatment, an interventional or surgical method suited to the heart anatomy is determined. Does Pulmonary Atresia Require Surgery? Pulmonary atresia is not a disease that can resolve on its own. In most patients, a catheter procedure, surgical treatment, or both together are needed to ensure adequate blood flow to the lungs. The treatment plan is determined according to the following factors: - Size and function of the right ventricle - Structure of the tricuspid valve - Development of the pulmonary arteries - Presence of additional openings in the heart - Anatomy of the coronary vessels - Vascular connections that supply blood to the lungs - The baby's general health The same operation is not performed on every child. Treatment and Surgical Options in Pulmonary Atresia The main aim of treatment is to ensure adequate blood flow to the lungs and, if possible, to allow both ventricles of the heart to take part in the circulation. 1. Opening the Pulmonary Valve with a Catheter In some babies with suitable anatomical features, it may be possible to open the closed pulmonary valve with a catheter method. During this procedure, special catheters and wires are used to create a passage through the area of the closed valve. Balloon dilation may then be performed. However, this method is not suitable for every patient. In particular, the anatomy of the right ventricle and coronary vessels needs to be evaluated in detail. 2. Systemic-Pulmonary Shunt Operation A shunt operation may be performed in some babies who are not getting enough blood to the lungs. In this procedure, a surgical connection is created that carries blood from the body's circulation to the pulmonary arteries. The aim is to increase the baby's oxygenation and to ensure adequate blood flow to the lungs until the next stages of treatment. In some patients, placing a stent in the ductus arteriosus may be preferred instead of a surgical shunt. 3. Surgical Repair of the Right Ventricular Outflow Tract In some children whose right ventricle is sufficiently developed, direct blood flow from the right ventricle to the lungs can be created. During the surgical procedure, the pulmonary valve area or the right ventricular outflow tract may be reconstructed. The aim of this method is to achieve a two-ventricle circulation whenever possible. 4. Glenn and Fontan Operations In some patients whose right ventricle is not sufficiently developed or in whom a two-ventricle circulation is not possible, a single-ventricle treatment approach may be needed. In this case, staged surgical methods may be used. Glenn Operation: Venous blood coming from the upper part of the body is directed straight to the pulmonary arteries. Fontan Operation: Venous blood coming from the lower part of the body is also directed to the pulmonary circulation. The aim of these operations is to rearrange the circulation by reducing the load on the functional ventricle. 5. Complete Repair in PA/VSD Patients In some children with pulmonary atresia accompanied by VSD, complete surgical repair may be possible. During the operation: - The opening between the ventricles may be closed. - Blood flow from the right ventricle to the lungs may be created. - The pulmonary arteries may be reconstructed. - A valved conduit may be used when necessary. In some patients, the collateral vessels that supply blood to the lungs may need to be joined together or rearranged. Surgical treatment may be carried out in a single stage or with more than one operation. Are Pulmonary Atresia Operations Risky? Pulmonary atresia operations are among the complex procedures of pediatric heart surgery. Surgical risks vary according to the type of disease, the heart anatomy, the baby's age, and the method to be used. Possible complications include: - Bleeding and infection - Heart rhythm disorders - Deterioration of heart function - Narrowing or blockage at the vascular connections - Oxygenation problems - The need for an additional catheter procedure or operation Treatment planning may be more complex, particularly in some patients who have abnormal connections with the coronary vessels. Recovery Process After Pulmonary Atresia Surgery After surgery, babies and children are closely monitored in the pediatric heart surgery intensive care unit. During this period: - Heart and circulatory functions are evaluated. - Oxygen level is monitored. - Blood flow in the pulmonary arteries is checked. - Heart rhythm is monitored. - Feeding and weight gain are evaluated. - Necessary medication treatments are arranged. The recovery period may vary according to the extent of the operation performed and the child's general health. Can Children Live Normally After Pulmonary Atresia Treatment? After successful treatment, many children can grow, continue their education, and carry on their daily activities. However, long-term outcomes differ according to the type of disease, the development of the right ventricle, and the surgical method used. In some children, pulmonary valve insufficiency, vascular narrowing, or heart rhythm disorders may develop in later years. In patients in whom a valved conduit is used, reintervention may be needed as they grow. For this reason, it is important for children with pulmonary atresia to be followed for life by cardiology teams experienced in congenital heart disease. Why Is Early Diagnosis Vital in Pulmonary Atresia? Pulmonary atresia can cause serious oxygen deficiency, especially in the newborn period, because not enough blood can reach the lungs. Diagnosis during pregnancy or right after birth allows the necessary intensive care and treatment facilities to be prepared in time. Thanks to early diagnosis, keeping the ductus arteriosus open and an appropriate catheter procedure or surgical intervention can be planned without delay. Coordinated work by pediatric cardiology, pediatric heart surgery, and newborn intensive care teams is of great importance in the treatment process. Remember: Pulmonary atresia is a serious heart disease that can be life-threatening from birth. However, in suitable patients, blood flow to the lungs can be ensured with catheter procedures and surgical treatments. Early diagnosis, correct treatment planning, and lifelong cardiology follow-up play an important role in increasing children's life expectancy and quality of life.