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Small doses of Epi may do what?
decrease BP, because B2 vasodilator is more sensitive than the constrictor A receptors
Why is Epi coformulated with local anesthetics?
local vasoconstrictive effects slows absorption to keep injection where the dentist wants it to be
What does Epi do to heart?
powerful and direct cardiac stimulant, increases HR, shortens systole, increases CO, increases O2 consumption
What does Epi do to coronary blood flow?
increases it, increases diastole duration and aortic pressure
What is low dose dopa good for?
D1 action, vasodilates, good for improving GFR/renal perfusion/urine output
What would dobutamine be used for?
short term treatment of cardiac decompensation (after cardiac surgery, CHF, acute MI)
when should isoproterenol be used?
in emergencies to stimulate HR in pts with heart block/bradycardia, esp before insertion of pacemaker, and in pts with torsades de pointes
what does this do to arteries, BP, HR, CO
arterial vasoconstriction, raises BP, leading to a reflex drop in HR and CO
When might phenylephrine be useful?
control of hypotension associated with epidural (regional or spinal anesthesia)
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