brain, spinal cord, and nerve disorders
Pure Autonomic Failure
Diagnosis of Pure Autonomic Failure
A doctor's evaluation Tests to rule out other possible causes Doctors check for signs of autonomic dysfunction during the physical examination and with Diagnosis . If people have REM sleep behavior disorder and orthostatic hypotension due to autonomic dysfunction, they probably have pure autonomic failure. Doctors may do a blood test to measure levels ofnorepinephrine.Norepinephrineis one of the chemical messengers (neurotransmitters) used by nerve cells to communicate with each other. This blood test may distinguish pure autonomic failure from other autonomic nervous system disorders that cause similar symptoms. Low levels ofnorepinephrinesuggest pure autonomic failure. 