Autonomic Nervous System Test
What is Autonomic Nervous System Test?
Nerves of the autonomic nervous system control heart rate and blood pressure, and they also control blood flow and sweat gland function. In the autonomics laboratory, we perform two types of non-invasive simple studies; sympathetic skin response test (SSR) and R-R variability (HRV heart rate variability).
When is Autonomic nervous system testing requested?
Autonomic nervous system testing is requested for the patients who are suffering from
- Diabetic neuropathy
- Recurrent unexplained fainting spells
- Recurrent dizziness on assuming upright position (standing up)
- Central neurodegenerative disorders (e.g., Parkinson’s disease)
- Peripheral neuropathy of any cause
- Guillain-Barré syndrome
What is RR Interval? How is it conducted?
Heart Rate Variability (HRV) monitors the R-R intervals throughout all segments of the test. The general concept is for the patient to perform a series of maneuvers like quiet breathing, deep breathing and standing up; while the ANS system regulates the body’s response. These responses are recorded by sticker electrodes applied to the hands and displayed on a computer screen.
How should you prepare for testing?
Patients should not smoke or use caffeine for 3 hours prior to testing. Alcohol should be avoided for 12 hours prior to testing.
How much time does the testing take?
Autonomic testing by well-established methods performed under controlled conditions can take up to 30-60 minutes.
Are these tests safe?
Yes , these are non-invasive tests and patients can return to the pretest routine immediately after the test.