<prompt> Which wall of hea is enlarged first in a patient with mitral stenosisRight atriumLeft atriumRight ventricleLeft ventricle  <response>: Rheumatic fever is the leading cause of mitral stenosis MS. Other less common etiologies of obstruction to left ventricular inflow include: congenital mitral valve stenosis, cor triatriatum, mitral annular calcification with extension onto the leaflets, systemic lupus erythematosus, rheumatoid ahritis, left atrial myxoma, and infective endocarditis with large vegetations. Pure or predominant MS occurs in 40 of all patients with rheumatic hea disease and a history of rheumatic fever. Mitral Stenosis Pathophysiology:- Ref:- HarrisonsTM Principles of Internal Medicine 20th edition; pg num:- 1813 