This paper provides a comprehensive overview of Patent Ductus Arteriosus (PDA), a congenital cardiovascular condition in which the fetal blood vessel connecting the descending aorta and pulmonary artery fails to close after birth. The paper covers the definition and etymology of the term, associated congenital defects, the physiological consequences of abnormal blood shunting, and the range of symptoms seen in infants and older patients. It also examines how shunt severity is determined and discusses both medical and surgical treatment options, including indomethacin therapy and cardiac catheterization, noting generally favorable outcomes when the condition is properly diagnosed and treated.
Patent Ductus Arteriosus is a serious condition for those who have it. "Patent" means open or unobstructed; "ductus" refers to the blood vessel in a fetus that joins the pulmonary artery and the descending aorta; and "arteriosus" means pertaining to the artery. Taken together, Patent Ductus Arteriosus (PDA) is defined as an abnormal opening located between the descending aorta and the pulmonary artery that allows for the shunting of blood from left to right. The result is that arterial blood is recirculated through the lungs.
Often, there are no clinical effects early in a person's life, but by the age of 40 symptoms can usually be observed in most individuals with this condition. These symptoms are typically manifest as pulmonary vascular disease. Many patients undergo surgery to repair the problem or have a shunt placed to help correct it. Of these individuals, most recover well, and their chances for recovery are quite good. If, however, the problem is not diagnosed or repairs are not made properly, PDA can advance into Congestive Heart Failure (CHF), which can be fatal.
PDA is most often seen in premature infants, and rubella syndrome frequently accompanies it. Other congenital defects — such as ventricular septal defect, pulmonary and aortic stenoses, and coarctation of the aorta — are often associated with it as well. The primary cause of PDA is that the fetal ductus arteriosus, a fetal blood vessel connecting the descending aorta to the pulmonary artery, fails to close properly after birth. It should close on its own in the days or weeks following delivery.
Infants with a very large PDA typically show signs of respiratory distress and CHF. Also possible is a failure to thrive, a high frequency of respiratory infections, and slower-than-average motor development. On average, most children with PDA exhibit only cardiac symptoms rather than other heart disease symptoms such as fatigability and physical underdevelopment. Fatigability and dyspnea on exertion may be seen in PDA patients who have reached 40 years of age if their PDA has not been treated, or has not been treated properly.
"How abnormal shunting affects circulation and heart"
"Medical and surgical approaches with recovery rates"
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