Quantitative Sudomotor Axon Reflex Test (QSART)
Quantitative Sudomotor Axon Reflex Test (QSART) is a test to evaluate the integrity of the postganglionic sudomotor system along the axon reflex to define the distribution of sweat loss. This is accomplished by the release of bio-impedance electrical stimulation the skin which activates receptors on the eccrine sweat gland. The sweat response is recorded from four sites (forearm and 3 lower extremity sites) and assessed for deficits.
The QSART is a test that measures the autonomic nerves that control sweating. The test is useful in assessing autonomic nervous system disorders, peripheral neuropathies and some types of pain disorders. The test requires a mild electrical stimulation on the skin, which allows to stimulate sweat glands. The QSART measures the volume of sweat produced by this stimulation.
QSART is used to diagnose:
- Painful, small fiber neuropathy when nerve conduction test results are normal
- Disturbances of the autonomic nervous system, which controls the sweat glands, heart, digestive system, other organs, and blood pressure
- Complex pain disorders
- Diabetic neuropathies
- Enzyme disorders
- RSD (Reflex Sympathetic Dystrophy, Complex Regional Pain Syndrome)
- Pharmaceutical agents
- Cosmetics/Consumer goods testing
- Dermatological studies
- Multiple System Atrophy (Shy-Drager syndrome)