A nurse is preparing to administer heparin to a client. Which of the following actions should the nurse plan to take?

Choice A reason: Ototoxicity is not a severe reaction to propranolol, but it may occur with some other medications, such as aminoglycosides, loop diuretics, or salicylates. Ototoxicity may damage the inner ear or the auditory nerve and cause hearing loss, tinnitus, or vertigo. The nurse should assess the client's medication history and monitor the client's hearing function.

Choice B reason: Hypokalemia is not a severe reaction to propranolol, but it may occur with some other medications, such as thiazide diuretics, corticosteroids, or insulin. Hypokalemia may cause muscle weakness, cramps, arrhythmias, or cardiac arrest. The nurse should advise the client to eat foods rich in potassium, such as bananas, oranges, or potatoes, and to have regular blood tests to check the electrolyte levels.

Choice C reason: Tachycardia is not a severe reaction to propranolol, but it may be a sign of overdose, withdrawal, or rebound effect. Propranolol is a beta-blocker that lowers the heart rate and blood pressure by blocking the effects of epinephrine and norepinephrine. Propranolol may cause bradycardia, not tachycardia, as a side effect. The nurse should monitor the client's vital signs and advise the client to take the medication as prescribed and not to stop it abruptly.

Choice D reason: Postural hypotension is a severe reaction to propranolol, as it may cause dizziness, fainting, or falls. Postural hypotension occurs when the blood pressure drops significantly when the client changes position, such as from lying to sitting or standing. Propranolol may cause postural hypotension by reducing the vascular tone and the cardiac output. The nurse should instruct the client to change position slowly and to report any symptoms of postural hypotension to the provider.

Choice A reason: Migraines are not a contraindication for propranolol. In fact, propranolol is used as a prophylactic treatment for migraines, as it reduces the frequency and severity of migraine attacks.

Choice B reason: Glaucoma is not a contraindication for propranolol. Propranolol does not affect the intraocular pressure or the drainage of aqueous humor in the eye.

Choice C reason: Asthma is a contraindication for propranolol. Propranolol is a nonselective beta-blocker, which means it blocks both beta-1 and beta-2 receptors in the body. Beta-2 receptors are found in the bronchial smooth muscle, and when they are blocked, they cause bronchoconstriction and increased airway resistance. This can worsen the symptoms of asthma and cause a life-threatening asthma attack.

Choice D reason: Depression is not a contraindication for propranolol. Propranolol does not cause depression, although it may cause some side effects such as fatigue, insomnia, and sexual dysfunction. However, these side effects are usually mild and reversible.