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Physiology

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Cardiovascular System

Question
15 out of 19
 

The regional arterial resistance of the mesentry and kidney vessels is reduced by



A Dopamine
B Dobutamine

C Nor adrenaline
D Isoprenaline

Ans. A Dopamine

a. Dopamine:­

i.D1 + D2 + α. + β1(not β2) agonist.

ii.The D1 receptors in renal and mesentric blood vessel are the most sensitive: - I.V. infusion of low dose dopamine dilates these vessels by cAMP →↑es GFR and Na+ excretion.

iii.Use: - in cardiogenic or septic shock and severe CHF to increase BP and urine outflow.

b.Dobutamine:­

i.Relatively selective β1agonist

ii.Used as inotropic agent in pump failure accompanying M.I., cardiac surgery and short term

a. Isoprenaline: β1+ β2–sympathomimetic

Cardiovascular System Flashcard List

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