<prompt> Dales vasomotor reversal phenomenon occurs with ?DopamineAdrenalineNor AdrenalineAll of the above  <response>: Ans. is b Le., Adrenaline Adrenalineiyen by slow i.v. infusion or S.C. injection causes rise in systolic but fall in diastolic BP. o Kis-due to a receptor mediated vasoconstriction and fall is due to 132 mediated vasodilation. If an a blocker is given before, only fall in BP seen due to 3, mediated action - Vasomotor reversal of dale. Dales vasomotor is due to blockadge of a-receptor and stimulation of 3, receptors. Remember In Dales vasomotor reversal Neurotransmitter- Adr Blokcade - a - receptors Stimulation - 32-receptors Re-reversal of vosomotor reversal is due to propranolol -blockers. 