beta adrenoceptor blockers with anaesthesia

Antagonists of the beta receptors are widely widely used in medicine and in anaesthessia.there are two types of adrenergic receptors.alpha and beta receptors.the receptors are divided into beta 1 receptors which mediate the positive intropic effect on the heart , and beta 2 receptors which mediate smooth muscle relaxation in the bronchi and vasculature.similarly, the alpha receptors are further subdivided into alph 1 and alpha 2 receptors .the beta blocking drugs have different pharmacodynamic and pharmacokinetic properties.beta blocker provide pharmacological alternatives when adverse reaction prohibit the use of the specific drug.