what is autonomic nervous system testing
DESCRIPTION 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.astrointestinal secretions and motility (including evacuation) are stimulated, heart rate is slowed, and blood pressure decreases. 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.