Stop memorizing and start understanding the shunt! Master Atrial Septal Defect (ASD). We deconstruct the physics of "Fixed S2 Splitting," the differences between Secundum and Primum types, and the latest 2020 ESC guidelines for management and closure. IMPORTANT INTERNATIONAL MEDICAL DISCLAIMER This content is created solely for educational purposes for USMLE, PLAB, MCCQE, and international medical board exam preparation. The information provided herein does not constitute a clinical diagnosis, treatment guide, or medical advice. For clinical practice, the opinion of a specialist physician and official medical guidelines are essential. Video Summary: In Module 1 of our Congenital Series, Dr. Collins and Sarah explore the hole in the atrial wall. We analyze the Left-to-Right shunt that leads to Right Ventricular volume overload. Learn why the S2 split doesn't change with breathing in ASD and how to identify the high-yield link between Ostium Primum and Down Syndrome. 📚 RESOURCES & GUIDELINES: 2020 ESC Guidelines for the Management of Adult Congenital Heart Disease: https://www.google.com/search?q=https... AHA/ACC Guideline for the Management of Adults With CHD: https://www.ahajournals.org/doi/full/... #ClinicalCrashCourse #ASD #Cardiology #USMLE #CongenitalHeartDisease #MedEd #HeartMurmurs