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.
Mitral regurgitation is leakage of blood backward through the mitral valve each time the left ventricle contracts. Aortic valve regurgitation may stem from a congenital heart defect, complications of an infection or other more rare causes.