So I am looking for some help regarding a homework question. The meds that are part of the question are Dopamine, Hydrochlorothiazide, Nipride, and Epinephrine. How do I determine how each of these meds affect the heart in terms of preload, afterload, and contractility. I think I'm starting to understand, but I would like a little help with the subject.
This is what I have so far, but we are just learning this stuff and it's driving me crazy!
-Dopamine is a vasopressor, so does it increase afterload only?
-Hydrocholorothiazide is a diuretic so since it decreases volume does it decrease preload and afterload?
-Epi is a vasoconstrictor so that would have to increase afterload.
-Nipride is a vasodilator, so does this decrease afterload only. (Or, would it decrease preload as well since there would be more blood in the periphery due to the vasodilation?)
Am I understanding this or am I way off?? I feel like I'm starting to get the basics, but a little push in the right direction would be greatly appreciated, thanks!!