Sympathetic hyperfunction syndrome.

Vegetative troubles induced by sympathetic hyperfunction are presented and an attempt is made to systematize them. Functional tachycardia or premature beats in neurocirculatory asthenia, symptoms of sympathetic irritation in cervical radicular syndrome, hyperkinetic syndrome with positive exercise test, long Q--T syndrome, the classic troubles of sympathetic origin in pheochromocytoma and "the vegetative storm" in cerebral damages or excessively stressful situations may be included in the sympathetic hyperfunction syndrome. Of greater clinical interest is the cervical radicular syndrome with sympathetic irritation, which is presented in details, with reappraisal of some morphofunctional data that must be taken into account in clinical reasoning.