Right Atrium Clinical Anatomy | Fossa Ovalis, PFO, ASD & Transseptal Puncture | Cardiology Series

Right Atrium Clinical Anatomy | Fossa Ovalis, PFO, ASD & Transseptal Puncture | Cardiology Series Like this video? Sign up now on our website at https://www.DrNajeebLectures.com to access 1000+ Exclusive videos on Basic Medical Sciences & Clinical Medicine. These are premium videos (NOT FROM YOUTUBE). All these videos come with English subtitles & download options. Sign up now! Get Lifetime Access for a one-time payment of $49 ONLY! Sign up now on our website at https://members.drnajeeblectures.com/ ------------------------------------------------------------------------------------------------------------------- Why sign up for premium membership? Here's why! Membership Features for premium website members. 1. More than 1000+ Medical Lectures. 2. Basic Medical Sciences & Clinical Medicine. 3. Mobile-friendly interface with android and iOS apps. 4. English subtitles and new videos every week. 5. Download option for offline video playback. 6. Fanatic customer support and that's 24/7. 7. Fast video playback option to learn faster. 8. Trusted by over 2M+ students in 190 countries. ------------------------------------------------------------------------------------------------------------------- ▬▬▬▬▬▬▬▬▬▬ Contents of this video ▬▬▬▬▬▬▬▬▬▬ Master right atrium anatomy with this clear breakdown of morphological regions. Visualize the inter-atrial septum and related defects. This lecture provides a detailed examination of the right atrium, focusing on its specific walls and internal structure. Medical students and biology learners will gain a clearer understanding of cardiac morphology through whiteboard diagrams that simplify complex anatomical relationships. By reviewing the physical layout of the heart, you will better comprehend the structural basis of clinical conditions. We specifically examine the fossa ovalis and its clinical significance regarding a patent foramen ovale. The lesson connects these anatomical landmarks to the development of an atrial septal defect, providing a functional context for your studies. Whether you are prepping for exams or reviewing heart physiology, this walkthrough clarifies the essential components of the right atrium. ----------------------------------------------------- 00:00 – 03:34 | Introduction: Right Atrium Anatomy The lecture introduces the clinical anatomy of the right atrium, focusing on its internal structure. Traditionally, the right atrium was described as having six walls, but modern cardiology considers this an oversimplification. The right atrium is better understood in four morphological regions: septal, sinus venarum, trabecular, and tricuspid vestibular regions. The lecture integrates anatomy with important clinical correlations. 03:34 – 14:23 | Medial Wall and the True Interatrial Septum The apparent medial wall of the right atrium is not entirely a true interatrial septum. The main area directly separating the right and left atria is the floor of the fossa ovalis. Other parts of the apparent septal wall are formed by infolded atrial walls and may contain extracardiac structures, including pericardial tissue and fat. This distinction is clinically critical during transseptal catheter procedures. 14:23 – 27:52 | Fossa Ovalis and Safe Transseptal Puncture 27:52 – 42:45 | Foramen Ovale in Fetal and Postnatal Circulation The lecture introduces two commonly confused concepts: patent foramen ovale (PFO) and atrial septal defect (ASD). In fetal life, the lungs are not functioning for gas exchange, so the foramen ovale provides a physiological pathway for blood to move from the right atrium toward the left side of the heart. After birth, lung expansion lowers pulmonary vascular resistance, increasing blood flow to the left atrium. Increased left atrial pressure pushes the septum primum flap against the opening, functionally closing the foramen ovale. The adult remnant is the fossa ovalis. 42:45 – 53:09 | Patent Foramen Ovale (PFO) 53:09 – 01:03:49 | PFO, Paradoxical Embolism and Cryptogenic Stroke Normally, a thrombus originating in deep veins travels to the right heart and enters the pulmonary circulation, where it may cause pulmonary thromboembolism. In a person with PFO, a temporary rise in right atrial pressure can open the potential communication. Situations such as coughing, sneezing, straining, or the Valsalva manoeuvre may transiently increase right atrial pressure. A venous embolus may then cross from the right atrium to the left atrium and enter systemic circulation. This is called paradoxical thromboembolism and may result in a cryptogenic stroke, particularly if the embolus reaches the brain. ----------------------------------------------------- Join this channel to get access to the perks: Sign up now on our website at https://members.drnajeeblectures.com/ Follow us on Facebook:-   / drnajeeb   Follow us on Instagram:-   / drnajeeblectures