A patient faints while quickly getting up from a hot pool.Which of the following drugs could have caused this event?

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Quizplus · Accepted Answer

Prazosin is an alpha antagonist and dilates blood vessels,reduces blood pressure and is prone to orthostatic hypotension which in this case is exaggerated by additional blood vessel dilatation caused by the hot water.This event can be caused by all drugs which dilate blood vessels or cause orthostatic hypotension.The patient must be advised to stand up slowly and to hold on to a firm support and,in case of elderly individuals,the therapist should support that person while exiting the pool.The other drugs are not associated with significant blood vessel dilatation and orthostatic hypotension.Salmeterol is a beta agonist used in the therapy of asthma.Phenylephrine is an alpha agonist used to dilate the pupils for eye examinations and to reduce nasal congestion during a cold.Metaprolol is a beta-blocker used to treat hypertension and dysrhythmias.

A Patient Faints While Quickly Getting Up from a Hot