<prompt> Dopamine given in acute CHF DOES NOT act on which of the following receptors?Receptors present on renal blood vesselsD1 receptorsBeta 1 receptorsAlpha 1 receptors  <response>: Ans. D Alpha 1 receptorsRef: Katzung 13th142, 144Dopamine is used in CHF for its stimulatory effects on beta 1 receptors. It has dose dependent effects as followsReceptor stimulatedActionDose requiredD1Renal vasodilation1-2 mgkgminb1 Cardiac stimulation2-10 mgkgmina1 Vasoconstriction 10 mgkgminTherefore, in CHF, it is used at a dose of 2-10 megkgmin. Thus, dopamine stimulates D1 and beta 1 receptors but not alpha 1 receptors. 