(1) The increase in high-frequency cardiac modulation is representative of an increase in vagal tone.(2) Increases in arterial flow stimulate efferent vagal outflow, inhibiting sympathetic drive and decreasing blood pressure.(3) Cardiovascular neuropathy is a result of damage to vagal and sympathetic nerves.(4) Repeated operations of the esophagus or stomach carry a risk of vagal injury, which may lead to gastroparesis.(5) The procedure involves wrapping an electrode around the vagal nerve as it passes through the neck.
