A nurse assesses a client with mitral valve stenosis. What clinical sign or symptom would alert the nurse to the possibility that the client's stenosis has progressed?

A. Muted systolic murmur: Mitral valve stenosis typically produces a diastolic murmur, not a systolic one. A muted systolic murmur does not specifically indicate progression of mitral stenosis. B. Dyspnea on exertion: As mitral stenosis progresses, the narrowed valve obstructs blood flow from the left atrium to the left ventricle. This increases left atrial pressure and leads to pulmonary congestion. Dyspnea on exertion is a classic early sign of worsening mitral stenosis and indicates disease progression. C. Upper extremity weakness: Weakness of the upper extremities is not a typical manifestation of mitral valve stenosis progression. It may suggest a neurologic or musculoskeletal issue instead. D. Oxygen saturation of 93%: Although slightly decreased, an oxygen saturation of 93% is only mildly low and not specific for progression of mitral stenosis. Dyspnea related to pulmonary congestion is a more significant and classic indicator.