MSS: Mass Storage System: MSS: Manufacturers Standardization Society: MSS: Multiple Sclerosis Society: MSS: Maxtor Shared Storage: MSS: Mission Support Squadron: MSS: Multi-Spectral Scanner: MSS: Merit System Services: MSS: Mobile Servicing System: MSS: Ministry of State Security (Chinese counterintelligence organization) MSS: Management Support System: MSS: Maternal Serum Screening: MSS
Symptoms of aortic valve regurgitation include: 1  Shortness of breath, especially with activity. 2  Fatigue and weakness. 3  Fainting (syncope). 4  Trouble breathing at night. 5  Swelling in the legs and sometimes the rest of the body (edema). 6  Awareness of the heartbeat (palpitations), especially when lying on the left side.
Aortic stenosis is a narrowing or blockage of the aortic valve that happens when the valve leaflets become coated with deposits. The deposits change the shape of the leaflets and reduce blood flow through the valve.wo diseases of the aortic valve are regurgitation and stenosis. Aortic regurgitation. Aortic regurgitation is also called aortic insufficiency or aortic incompetence. It is a condition in which blood flows backward from a widened or weakened aortic valve into the heart's lower chamber (the left ventricle).