While the specific Latin phrase "Doctrina Perpetua" is rarely used in modern English medical literature, it refers to the pathological state where the fetal ductus arteriosus fails to close after birth, requiring surgical or interventional correction. Abstract The ductus arteriosus is a vital fetal structure that allows blood to bypass the non-functioning lungs. In a normal transition to extrauterine life, this vessel undergoes functional closure within hours and anatomical closure within weeks. When this mechanism fails, the result is a Patent Ductus Arteriosus (PDA), a condition historically categorized under the "perpetual" persistence of fetal structures. This article provides an in-depth analysis of the surgical doctrine regarding PDA, tracing the evolution of treatment from the first daring interventions of the 20th century to modern minimally invasive techniques. It serves as a textual resource suitable for students, residents, and surgeons seeking a detailed understanding of the procedural standard of care. 1. Historical Context and the "Doctrina" of PDA The understanding of the ductus arteriosus dates back to the anatomical works of Galen, but it was the 20th century that birthed the surgical doctrine for its correction. The term "perpetual" in older texts emphasized the pathological permanence of a structure meant to be temporary. Digital Design 6th Solution Github