Explore the intricacies of chronic bronchitis in this comprehensive pulmonology lecture. Delve into the definition, diagnosis, and complications of this common respiratory condition. Learn about the differences between chronic bronchitis and emphysema, understand the A gradient concept, and interpret flow volume loops. Discover important clinical pearls and gain insights into associated complications such as polycythemia. Enhance your understanding of COPD and its management through this informative and detailed presentation on chronic bronchitis.