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Patent ductus arteriosus (PDA) is a persistent opening between two major blood vessels leading from the heart. The opening, called the ductus arteriosus, is a normal part of a baby's circulatory system before birth that usually closes shortly after birth.
open and unblocked, such as a patent airway or a patent anus. Medspeak. adjective Open, not occluded; unobstructed; referring to a duct, lumen or vessel. Science-speak. noun A document that grants an inventor, in terms of a determined number of years, the exclusive right to make use of and sell his or her invention.nvestigators into the effects of the prostaglandins have reported that closure of a patent ductus arteriosus can be produced in preterm infants by administration of an inhibitor of prostaglandin formation.