in SNS NE, HR, contractility,
possible chest pain do to myocardial demand.Last updated 09/06/01 08:53 PM
3. Your patient has been treated for many years with propranolol to control his hypertension. Explain why abrupt withdrawal of the ß-blocker would be deleterious in terms of the cardiovascular reflexes and cellular mechanism(s) that underlies these effects.
Due to the many years of continued use of propranolol, the ß receptors have up-regulated. Therefore with an abrupt withdrawal you are going to have an increased number of free ß receptors. That may cause a rebound hypertension. Patient should be tapered off ß blockers therapy in order to avoid precipitation of arrhythmias.
Cellular mechanisms due to free ß1 receptors include an
in SNS NE, HR, contractility,
possible chest pain do to myocardial demand.