What is the primary reason for completing the full course of antiviral medication when treating a herpes cold sore?

This question addresses the monitoring requirements for patients receiving potent opioid analgesics. It requires applying knowledge of opioid-induced respiratory depression, which is the most dangerous potential adverse effect, requiring constant vigilance to ensure patient safety and prevent hypoxic events during the postoperative recovery period.

Choice A rationale

While opioids can cause hypotension due to peripheral vasodilation, it is not as acutely life-threatening as respiratory depression. Blood pressure monitoring is important but secondary to the immediate, time-critical need to ensure the patient maintains a safe and effective rate of breathing.

Choice B rationale

Opioids do not typically cause direct changes to body temperature. While temperature monitoring is part of standard postoperative care to detect infection or other complications, it is not the primary vital sign concern when administering a dose of hydromorphone.

Choice C rationale

Hydromorphone is a powerful opioid that acts on central nervous system receptors to suppress the respiratory drive. Shallow respirations or a low respiratory rate are the most serious adverse effects, requiring immediate assessment to prevent respiratory arrest and significant patient harm.

Choice D rationale

Opioids can cause bradycardia, but this is generally managed effectively unless the patient is hemodynamically unstable. Heart rate is a vital parameter to monitor, but it is not the primary physiological concern following the administration of a potent opioid medication..

This question addresses a critical pharmacological contraindication involving phosphodiesterase-5 inhibitors. It requires applying safety knowledge regarding systemic vasodilation, as the combination of sildenafil and nitrates can lead to severe, refractory, and potentially fatal hypotension by potentiating the cyclic guanosine monophosphate pathway in vascular smooth muscle.

Choice A rationale

Epinephrine is a sympathomimetic drug used for anaphylaxis and cardiac support. It does not have a direct, life-threatening pharmacodynamic interaction with sildenafil. While caution is always prudent with cardiac medications, it is not a direct contraindication for phosphodiesterase-5 inhibitor use.

Choice B rationale

Sumatriptan is a serotonin agonist used for migraines. It is not contraindicated with sildenafil therapy. Patients can safely use both medications, as there is no known pharmacological mechanism where these two drugs interact to cause severe systemic hemodynamic instability or other dangerous adverse events.

Choice C rationale

Sildenafil and nitroglycerin both increase cyclic guanosine monophosphate, leading to profound vasodilation. Combining these drugs causes severe, life-threatening hypotension that is often refractory to treatment. Therefore, the nurse must always ask if the patient is taking nitrates before administering sildenafil.

Choice D rationale

Testosterone is a hormone used for replacement therapy and does not interact with sildenafil to cause dangerous hemodynamic changes. While side effects can exist, there is no clinical contraindication for the combined use of these medications in a patient undergoing appropriate therapy.