This is because it is not normal in shape, it billows out. This can be heard by a stethoscope. Occasionally blood may leak backward into the upper chamber of the heart. This can be heard as a heart murmur. If the mitral valve becomes to bad it will have to be repaired or replaced.
Syndrome means many symptoms.
The ANS controls virtually all body functions. Dysautonomia is a dysfunction of the Autonomic Nervous System. BUT, the ANS controls most of our bodily systems. This would include, the cardiovascular system, gastrointestinal, urinary and bowel funtions, temperature regulation, endocrine and metabolic systems. The ANS is also in charge of our reaction to stress-the flight or fight response.