Truncus Arteriosus in Children: Diagnosis and Surgical Treatment Truncus arteriosus is a rare and serious congenital heart disease in which a single large vessel leaves the baby's heart instead of the aorta and pulmonary artery, which normally leave it separately. In a healthy heart, the aorta carries oxygen-rich blood to the body, while the pulmonary artery sends oxygen-poor blood to the lungs. In truncus arteriosus, however, these two vessels form a single common vessel. There is usually also a large opening (VSD) between the heart's two lower chambers. As a result, oxygen-rich and oxygen-poor blood mix and are sent to both the lungs and the body. Truncus arteriosus is a serious heart anomaly that usually requires surgical treatment in the newborn period. What Are the Symptoms of Truncus Arteriosus in Children? Symptoms usually appear in the first days or weeks after birth. The most common symptoms are: - Rapid breathing and breathing difficulty - Bluish discoloration of the lips and skin (cyanosis) - Tiring quickly during feeding - Poor weight gain - Excessive sweating - Fast heartbeat - Signs of heart failure Urgent medical evaluation is needed, especially in cases of marked cyanosis, severe breathing difficulty and inability to feed. What Causes Truncus Arteriosus? This condition occurs when the great vessels fail to separate normally from each other during the development of the baby's heart in the womb. Although the exact cause is not always known, it may be associated with certain genetic and chromosomal differences. In particular, it may occur together with 22q11.2 deletion syndrome. For this reason, genetic evaluation may be recommended for some patients. How Is Truncus Arteriosus Diagnosed? The most important diagnostic method is echocardiography (cardiac ultrasound). Echocardiography makes it possible to evaluate: - The structure of the common vessel leaving the heart - The opening between the ventricles (VSD) - The origins of the pulmonary arteries - The structure and function of the common vessel's valve - The heart's pumping strength In some babies, the condition can also be detected during pregnancy with fetal echocardiography. When necessary, computed tomography (CT), cardiac MRI and genetic tests may be performed. When Does Truncus Arteriosus Require Surgery? Truncus arteriosus is a heart disease that does not resolve on its own and requires surgical treatment. If left untreated, excessive blood flow to the lungs, heart failure and permanent damage to the pulmonary blood vessels may develop. For this reason, surgery is usually planned in the first weeks of life, at the most suitable time possible depending on the baby's clinical condition. Before surgery, it may be necessary to support the baby's breathing and circulation and to bring the signs of heart failure under control. How Is Truncus Arteriosus Surgery Performed? The goal of surgical treatment is to create a more normal circulatory system by separating the blood flow to the lungs from the blood flow to the body. The operation is usually performed as open-heart surgery. 1. Closure of the VSD The opening between the heart's two ventricles is closed with a patch. This directs the blood leaving the left ventricle to the body through the common vessel. 2. Separation of the Pulmonary Arteries The pulmonary arteries are separated from the common vessel and prepared for the creation of a new connection for the pulmonary circulation. 3. Creating a Connection Between the Right Ventricle and the Lungs A special vascular graft (conduit), usually containing a valve, is placed between the right ventricle and the pulmonary arteries. This allows oxygen-poor blood to be sent to the lungs. 4. Evaluation of the Common Vessel's Valve If there is significant narrowing or leakage in the truncal valve, valve repair or another procedure may be needed during the same operation. Recovery After Surgery First Days: Intensive Care After surgery, the baby is closely monitored in the pediatric cardiac surgery intensive care unit. Breathing, heart rhythm, blood pressure and heart function are continuously evaluated. Recovery in the Hospital As the baby's general condition improves, breathing support is reduced and feeding is gradually adjusted. The length of the hospital stay depends on the extent of the surgery and the baby's recovery. Recovery at Home After discharge, feeding, weight gain, medication use and wound care should be carefully monitored. Long-Term Check-Ups Regular pediatric cardiology check-ups are necessary after surgery. In particular, the function of the conduit used between the right ventricle and the lungs is monitored. Is Another Intervention Needed After Truncus Arteriosus Surgery? Yes. Even if the first operation is successful, as the child grows the conduit that was placed may narrow, its valve function may deteriorate or it may not be able to keep up with the child's growth. For this reason, a catheter procedure or another operation may be needed in later years. In some patients, additional treatment may also be given for truncal valve problems or narrowing of the pulmonary arteries. Can Children with Truncus Arteriosus Lead a Normal Life? Many children who undergo successful surgical treatment early on can continue their growth and development, attend school and take part in suitable physical activities. However, long-term outcomes vary depending on the anatomical features of the disease, associated anomalies, the results of surgery and any complications that may develop. For this reason, lifelong follow-up by cardiologists specialized in congenital heart disease is important. Why Are Early Diagnosis and Surgery Important? If truncus arteriosus is not treated, high pressure in the pulmonary blood vessels, heart failure and serious circulation problems may develop. Early surgery aims to reduce the risk of permanent damage to the pulmonary blood vessels and to increase the baby's chance of survival. Conclusion A life that begins with a single vessel can gain a new future with the right surgical intervention. Truncus arteriosus is a serious congenital heart disease that requires rapid evaluation in the newborn period and surgical treatment at specialized centers. Thanks to advanced pediatric cardiac surgery techniques, intensive care facilities and regular cardiology follow-up, the aim is to extend patients' life expectancy and improve their quality of life. Remember: For babies diagnosed with truncus arteriosus, the timing of surgery and the treatment plan should be evaluated without delay by specialists in pediatric cardiology and pediatric cardiac surgery.