
In this lecture from This is Why, Dr. Busti will make the identification of the heart borders and heart chambers on a chest x-ray easy. Dr. Busti will walk step-by-step through how to identify the cardiac silhouette, locate the heart borders, and understand where the right atrium, left atrium, right ventricle, left ventricle, left atrial appendage, and apex of the heart sit on a standard PA chest x-ray (CXR).
You’ll see how to connect real heart xray images with the underlying heart anatomy.
You’ll learn how to:
- Identify normal heart borders on a chest xray
- Recognize which heart chambers form the right and left heart borders
- Understand where the right ventricle and left atrium actually sit on a CXR
- Use the silhouette sign to localize lung pathology next to the heart
- Apply a simple, repeatable approach to chest xray interpretation
The goal = make medical education easy and clinically relevant.
Chapter Table of Contents
00:00 Heart Borders on Chest X-Ray Made Easy
01:12 Step 1: Confirm PA vs AP + Image Quality (RIPE)
02:23 Heart Anatomy Orientation (3D Model to CXR)
03:20 Which Heart Chambers You Actually See on CXR
05:10 Overlay: Connect Heart Anatomy to the Cardiac Silhouette
07:35 Step 2: Trace the Heart Borders (Right Then Left)
09:38 Cardiothoracic Ratio: When It Counts (PA vs AP)
10:58 Silhouette Sign: Abnormal Examples (Pneumonia, Edema, Trauma)
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Disclaimer:
This content is for educational purposes only and is not medical advice. It does not replace individualized evaluation, diagnosis, or treatment. Always seek the advice of a qualified health provider with questions about a medical condition and never delay care because of educational content.

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