All of the given drugs are positive inotropes EXCEPT_____________?
Correct answer: D. Doxepin
- A. Dopamine
- B. dobutamine
- C. Digoxin
- D. Doxepin
Explanation
Dopamine, dobutamine and digoxin increase myocardial contractility through beta1 stimulation or enhanced intracellular calcium. Doxepin is a tricyclic antidepressant and may cause cardiac conduction and contractility depression rather than serving as a positive inotrope.
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