Stage B1 lacks remodeling; which finding would indicate remodeling consistent with Stage B2?

• A. Left ventricular enlargement
• B. No enlargement
• C. Right atrial enlargement
• D. Left atrial enlargement

Answer: (D)

Remodeled hearts in this context are showing structural changes from chronic mitral regurgitation, with the left-sided chambers enlarging as a response to volume overload. Stage B1 has no such remodeling, while Stage B2 shows it. Left atrial enlargement is the clearest sign of this remodeling process in a left‑sided valvular disease, because the regurgitant flow directly increases volume in the left atrium, causing it to dilate. This makes left atrial enlargement the best indicator of remodeling consistent with Stage B2. Left ventricular enlargement can occur as well, but the atrial change is the more direct and typical clue here. Absence of enlargement would suggest no remodeling, and right atrial enlargement points toward different, usually right‑sided, issues rather than the classic left‑sided remodeling seen with Stage B2.