Dales vasomotor re-reversal is due to
Reversal phenomenon - seen by giving alpha blocker-blockade of alpha 1 receptors - only fall in BP is seen due to stimulation of beta 2 receptors. Re reversal- IV Adrenalin administration - then beta-blocker administration - then adrenaline again - only rise in BP due to stimulation of alpha 1 receptors. Ref: Goodman Gillman 11th ed. Pg. 330.
Stimulation of alpha-1 receptors
Stimulation of beta-2 receptors
Blockade of beta -2 receptors
Blockade of alpha-1 receptors
Autonomic nervous system