Dimitri was next prescribed the beta -agonist isoprenaline (isoproterenol) and although he no longer experienced hypertension, he still experienced tachycardia. Why? The beta 1 and beta 2 receptors are stimulated by isoprenaline, both of which cause tachycardia. Hypertension is controlled by the muscarinic receptors. His tachycardia is triggered by an unrelated condition. The alpha receptors are not able to be stimulated by a beta -agonist, therefore hypertension is no longer a side effect.
[Answered]: Dimitri was next prescribed the beta -agonist…
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