What is cardiac remodeling?

• A. Changes that manifest clinically as changes in size, mass, geometry, & function of the heart (scar tissue, fibrosis, inflammation)
• B. An acute enlargement of the ventricles due to fluid overload only
• C. A purely electrical remodeling without structural changes
• D. Changes in the conduction system leading to arrhythmias

Answer: (A)

Cardiac remodeling is the heart’s structural and functional adaptation to injury or ongoing stress, leading to changes in the size, mass, geometry, and overall performance of the heart. After events like a heart attack or prolonged pressure or volume overload, the heart tissue undergoes alterations such as scar formation and fibrosis, which reshapes chambers and shifts how the heart contracts and relaxes. These structural changes can progress to or worsen heart failure if the underlying stress continues, and they encompass more than just electrical changes or transient fluid-related swelling. The description that specifically mentions changes in size, mass, geometry, and function, along with scar tissue, fibrosis, and inflammation, best captures this broad remodeling process. The other options describe more narrow scenarios—acute fluid-related enlargement, purely electrical changes, or conduction-system changes—that don’t fully define remodeling.