A 52-year-old woman presents with gradually worsening shortness of breath over 2 years and now requires 2 pillows at night. On examination, she has an apical diastolic murmur. This suggests she has valvular heart disease, likely mitral stenosis given the murmur location and symptoms. Mitral stenosis narrows the opening between the left atrium and ventricle, causing shortness of breath and difficulty sleeping flat. Surgical options may include balloon valvuloplasty or valve replacement depending on severity.