Why are beta blockers used cautiously in patients with respiratory conditions?
a. They mask the signs and symptoms of acute hypoglycemia.
b. They cause extensive vasodilation and cardiac overload.
c. They may produce severe bronchoconstriction.
d. They increase hypertensive episodes.
ANS: C
Nonselective beta blockers, such as Inderal, and larger doses of selective beta antagonists will readily affect the beta-2 receptors of the bronchi, causing bronchoconstriction. Therefore, beta blockers must be used with extreme caution in patients with respiratory conditions such as bronchitis, emphysema, asthma, or allergic rhinitis. Beta blockers affect blood glucose by inducing the hypoglycemic effects of insulin. Vasodilation relieves cardiac overload. Beta blockers induce hypotensive effects.
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