1) Cardiovascular physiology 
Dromotropic derives from the Greek word `dromos`, meaning running, a course, a race. A dromotropic agent is one which affects the conduction speed in the AV node, and subsequently the rate of electrical impulses in the heart. Agents that are dromotropic are often (but not always) inotropic and chronotropic. For example, parasympathetic stimulati.....
Influencing the velocity of conduction of excitation, as in nerve or cardiac muscle fibres. ... Origin: G. Dromos, a running, + trope, a turn ... (05 Mar 2000) ... 
(drom″o-tro´pik) affecting conductivity of a nerve fiber.
dromotropic 1. Affecting the conductivity of cardiac muscle; a reference to the influence of cardiac nerves. 2. Affecting the speed and conduction of nerve fibers.