The Circulatory Effects of Intravenous Phentolamine in Man.

THE recognition of the importance of the sympathetic nervous system in the control of the systemic arterial blood pressure has stimulated the search for therapeutically useful sympathoadrenergic blocking agents that may be of use in the diagnosis and treatment of hypertensive vascular disease. Numerous agents of diverse chemical structure have been developed and explored for such therapeutic effectiveness but few have proved to be of any clinical value. Among those, however, that have achieved