Inotropy: contraction of myocardium (contractility).
Chronotropy: firing of the SA node=affects the heart rate.
Lusitropy: relaxation of the myocardium.
Dromotropy: conduction velocity of AV node.
http://www.differencebetween.info/difference-between-inotropic-chronotropic-and-dromotropic
http://learnpediatrics.com/body-systems/cardiology/basics-of-cardiac-pharmacology/
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