Published on Feb 26, 2019
MCQ 20 answer

A β-blocker was prescribed for hypertension in a female asthma patient. After about a week of treatment, the asthma attacks got worse, and the patient was asked to stop taking the  β-blocker. Which of the following β-blockers would you suggest as an alternative in this patient that is less likely to worsen her asthma?

A.  Propranolol.

B.  Metoprolol

C.  Labetalol.

D.  Carvedilol

Ref: KDT  7E/ page 144

Correct answer is  B Metoprolol

  • The patient was most likely given a nonselective β-blocker (antagonizes both β1 and β2 receptors) that made her asthma worse due to  β2 antagonise
  • An alternative is to prescribe a cardio selective (antagonizes only β1) β-blocker that does not antagonize β2 receptors in the bronchioles
  • Metoprolol is a cardio selective  β-blocker Propranolol, labetalol, and carvedilol are nonselective β-blockers and could worsen the asthma


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