Acute aoic regurgitation occurs in-

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 Marfan's syndrome Bicuspid aoic valve Nonsyndromic familial aneurysm Aoitis Hypeension ( Harrison&;s principle of internal medicine,18th edition,pg no. 1943)