Cardiovascular system

Numerous cardiac abnormalities have been documented in myaglic encephalomyelitis and chronic fatigue syndrome patients. These include smaller than normal left ventricle of the heart and low cardiac output.

Orthostatic intolerance is also common.

CFS patients have several risk factors for heart disease. The mean age of death from heart failure of CFS patients is 58.7 years as compared to 83.1 years for the general population.