Autonomic Nerve Test

Autonomic testing is used to check for problems with your autonomic nervous system (ANS). You may need this test if you have symptoms of autonomic neuropathy. Symptoms will vary depending on which part of the nervous system is affected.

A transcranial Doppler (or TCD) test also uses ultrasound, but it focuses on the evaluation of flow in the major arteries inside the skull.

Stomach and gastrointestinal symptoms include:

• Constipation
• Diarrhea
• Nausea and vomiting

Bladder and urinary symptoms include:

• Difficulty urinating
• Leaking urine
• Urinating more often than usual

Heart and lung symptoms include:

• Rapid heart rate
• Shortness of breath with activity or exercise
• Dizziness
• Fainting
• Weakness

Other symptoms include:

• Too much or not enough sweating
• Sexual problems; erectile dysfunction in men

What happens during autonomic testing?

There are different types of autonomic tests. Depending on your symptoms, your neurologist may perform one or more of the following tests:

Deep Breathing Test and Valsalva Maneuver. These tests measure your heart rate and blood pressure while doing certain types of breathing.

• For both tests, a provider will place electrodes on your chest and a small blood pressure cuff on your finger.
• For a deep breathing test, you will take slow, deep breaths for one minute.
• For the Valsalva maneuver, you will breathe out forcefully through a mouthpiece while your nose is pinched shut.
• The electrodes and cuff will record your heart rate and blood pressure