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
However, as aortic valve regurgitation worsens, signs and symptoms may include: 1  Fatigue and weakness, especially when you increase your activity level. 2  Shortness of breath with exertion or when you lie down. 3  Swollen ankles and feet (edema). 4  Chest pain (angina), discomfort or tightness, often increasing during exercise.
According to The Cleveland Clinic, the common mitral regurgitation symptoms are: 1  Shortness of breath, especially during exercise or when you are laying still. 2  Fatigue, especially during exercise. 3  Cough, often during the night, when in bed.  Heart palpitations, or fluttering heartbeats, atrial 1  fibrillation. Swollen feet or swollen ankles.