Question:
Which of the following valvular heart diseases is associated with left atrial enlargement, left ventricular hypertrophy, and ECG showing ST depression?
Which of the following valvular heart diseases is associated with left atrial enlargement, left ventricular hypertrophy, and ECG showing ST depression?
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Valvular Chamber Dynamics:
- AS: Pressure overload $\rightarrow$ Concentric LVH $\rightarrow$ LAE (due to stiffness). ECG = LVH with strain.
- AR: Volume overload $\rightarrow$ Massive LV dilatation (cor bovinum).
- MS: LAE + RVH (LV is small and protected).
- MR: LAE + LV dilatation.
- AS: Pressure overload $\rightarrow$ Concentric LVH $\rightarrow$ LAE (due to stiffness). ECG = LVH with strain.
- AR: Volume overload $\rightarrow$ Massive LV dilatation (cor bovinum).
- MS: LAE + RVH (LV is small and protected).
- MR: LAE + LV dilatation.
Updated On: Sep 3, 2026
- AS
- AR
- MS
- MR
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The Correct Option is A
Solution and Explanation
Concept:
Different valvular lesions impose different mechanical loads (pressure vs. volume) on the heart chambers, leading to specific morphological adaptations (hypertrophy vs. dilatation) and characteristic electrocardiographic changes.
Explanation:
• Aortic Stenosis (AS) imposes a severe pressure overload on the left ventricle due to a fixed outflow tract obstruction. To generate the high pressures needed to force blood through the stenotic valve, the left ventricle undergoes concentric Left Ventricular Hypertrophy (LVH).
• As the LV wall thickens, it becomes stiff, and its compliance decreases significantly. This leads to elevated Left Ventricular End-Diastolic Pressure (LVEDP). To adequately fill this stiff ventricle, the left atrium must contract more forcefully against a higher pressure gradient, which leads to Left Atrial Enlargement (LAE).
• On an ECG, severe LVH is classically accompanied by a "strain pattern." This represents subendocardial ischemia secondary to increased muscle mass and wall stress, manifesting as asymmetrical ST-segment depression and T-wave inversion in the lateral leads (I, aVL, V5, V6).
• In contrast, Aortic Regurgitation (Option B) and Mitral Regurgitation (Option D) primarily cause volume overload, leading to eccentric hypertrophy (ventricular dilatation) rather than the massive, stiff concentric LVH of AS.
• Mitral Stenosis (Option C) protects the left ventricle from volume; it causes LA enlargement and Right Ventricular Hypertrophy, but the LV is typically small or normal.
Final Answer:
Aortic Stenosis classically produces profound concentric LVH with a secondary strain pattern on ECG (ST depression) and retrograde left atrial enlargement due to decreased LV compliance.
Different valvular lesions impose different mechanical loads (pressure vs. volume) on the heart chambers, leading to specific morphological adaptations (hypertrophy vs. dilatation) and characteristic electrocardiographic changes.
Explanation:
• Aortic Stenosis (AS) imposes a severe pressure overload on the left ventricle due to a fixed outflow tract obstruction. To generate the high pressures needed to force blood through the stenotic valve, the left ventricle undergoes concentric Left Ventricular Hypertrophy (LVH).
• As the LV wall thickens, it becomes stiff, and its compliance decreases significantly. This leads to elevated Left Ventricular End-Diastolic Pressure (LVEDP). To adequately fill this stiff ventricle, the left atrium must contract more forcefully against a higher pressure gradient, which leads to Left Atrial Enlargement (LAE).
• On an ECG, severe LVH is classically accompanied by a "strain pattern." This represents subendocardial ischemia secondary to increased muscle mass and wall stress, manifesting as asymmetrical ST-segment depression and T-wave inversion in the lateral leads (I, aVL, V5, V6).
• In contrast, Aortic Regurgitation (Option B) and Mitral Regurgitation (Option D) primarily cause volume overload, leading to eccentric hypertrophy (ventricular dilatation) rather than the massive, stiff concentric LVH of AS.
• Mitral Stenosis (Option C) protects the left ventricle from volume; it causes LA enlargement and Right Ventricular Hypertrophy, but the LV is typically small or normal.
Final Answer:
Aortic Stenosis classically produces profound concentric LVH with a secondary strain pattern on ECG (ST depression) and retrograde left atrial enlargement due to decreased LV compliance.
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