Persistent Ostium Primum, also known as atrial septal defect, is a congenital heart condition where there is an abnormal opening in the heart wall. While it may seem complex, there are several synonyms for this condition that can help simplify its understanding. One such synonym is "persistent interatrial communication", which signifies an ongoing communication between the atria. Another term used is "patent foramen ovale", which describes the presence of an unsealed opening between the atria. Lastly, the condition is often referred to as "atrial septal defect type 1", highlighting its classification within the spectrum of heart defects. By familiarizing ourselves with these synonyms, we can enhance our comprehension and discussions about Persistent Ostium Primum.