in·o·tro·pic 
(ē′nə-trōpĭk, -trŏpĭk, ī′nə-)
(ē′nə-trōpĭk, -trŏpĭk, ī′nə-)adj.
Affecting the contraction of muscle, especially heart muscle: an inotropic drug.
[Greek īs, īn-, tendon, sinew; see wei- in the Appendix of Indo-European roots + -TROPIC.]