Aortic regurgitation back up of blood from the left ventricle. Has no period of rest. Result of lesions affecting the integrity of the valves. Affects the closing of the valves. May be caused by trauma, encephalitis or the actual deterioration of a prior replacement of a valve. Left ventricle dilates to accommodate the increase of blood. Muscles are thinking they need more strength resulting in increased force. Will hear a high pitch blowing sound when you listening to heart. Tell pt to avoid physical exercision. Leads to dysrrthmia and treat HF in these pts.