<prompt> Acute aoic regurgitation occurs in-Infective endocarditisAnkylosing spondylitisMarfans syndromeRheumatoid ahritis  <response>: In patients with acute severe AR, as may occur in infective endocarditis, aoic dissection, or trauma, the LV cannot dilate sufficiently to maintain stroke volume, and LV diastolic pressure rises rapidly with associated marked elevations of LA and PA wedge pressures. Aoic regurgitation Valvular Congenital bicuspid Endocarditis Rheumatic fever Myxomatous prolapse Traumatic Syphilis Ankylosing spondylitis Root disease Aoic dissection Cystic medial degeneration Marfans syndrome Bicuspid aoic valve Nonsyndromic familial aneurysm Aoitis Hypeension Harrison;s principle of internal medicine,18th edition,pg no. 1943 