Which chamber's pressure buildup leads to pulmonary hypertension in MS?

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Multiple Choice

Which chamber's pressure buildup leads to pulmonary hypertension in MS?

Explanation:
Mitral stenosis creates an obstacle to flow from the left atrium to the left ventricle, so pressure builds up in the left atrium. That elevated left atrial pressure is transmitted backward into the pulmonary veins and capillaries, raising pulmonary venous and eventually pulmonary arterial pressures. Over time this backward transmission leads to pulmonary hypertension. The right heart may later struggle against this increased afterload, but the initiating pressure rise comes from the left atrium.

Mitral stenosis creates an obstacle to flow from the left atrium to the left ventricle, so pressure builds up in the left atrium. That elevated left atrial pressure is transmitted backward into the pulmonary veins and capillaries, raising pulmonary venous and eventually pulmonary arterial pressures. Over time this backward transmission leads to pulmonary hypertension. The right heart may later struggle against this increased afterload, but the initiating pressure rise comes from the left atrium.

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