A 35-year-old woman from rural India presents with progressive dyspnea on exertion, orthopnea, and palpitations. She has a history of acute rheumatic fever in childhood. On examination, she has a malar flush, a loud S1, and a low-pitched rumbling mid-diastolic murmur best heard at the apex in the left lateral decubitus position. Transthoracic echocardiography reveals the characteristic fish-mouth or buttonhole deformity marked as **A** in the diagram. Which of the following pathophysiological mechanisms DIRECTLY results from the stenotic orifice appearance shown at **A**?
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