Autonomic Nervous System Testing

The autonomic nervous system (ANS) regulates physiologic processes, such as blood pressure, heart rate, body temperature, digestion, metabolism, fluid and electrolyte balance, sweating, urination, defecation, sexual response, and other processes. Regulation of these functions occurs without conscious control, i.e., autonomously. Disorders of the ANS can affect any system of the body; they can originate in the peripheral or central nervous system and may be primary or secondary to other disorders.

The following are ANS testing types:

Cardiovagal innervation testing

Vasomotor adrenergic innervation testing

Quantitative sudomotor axon reflex test (QSART)

Thermoregulatory sweat test (TST)

Sympathetic skin response (SSR)

Quantitative direct and indirect axon reflex testing (QDIRT)