A client is prescribed a thiazide diuretic for the management of hypertension.
The nurse plans to assess the client for allergy to?

Nitroglycerin transdermal patches are used to prevent episodes of angina (chest pain) in people who have coronary artery disease (narrowing of the blood vessels that supply blood to the heart).Nitroglycerin is a vasodilator that works by relaxing the blood vessels so that the heart does not need to work as hard and therefore does not need as much oxygen.However, if nitroglycerin is used continuously, the body may develop tolerance to its effects, meaning that it will not work as well to prevent angina attacks.Therefore, it is important to remove the patch at bedtime and apply a new one in the morning, leaving a 10-12 hour nitrate-free interval.This way, the body can restore its sensitivity to nitroglycerin and avoid angina episodes during the day.

Choice A is wrong because allergic response is not a common reason to remove the patch at night.Although some people may experience skin irritation or rash from the patch, this is usually mild and does not require discontinuation of the medication.If the skin reaction is severe or bothersome, the patch can be applied to a different area of the skin or switched to another form of nitroglycerin.

Choice C is wrong because overdose is unlikely to occur from using the patch as prescribed.Nitroglycerin patches come in doses ranging from 0.1 milligrams per hour to 0.8 mg/hr, and should be placed on clean, dry, and hairless skin for 12-14 hours and removed for 10-12 hours.If a patch loosens or falls off, it should be replaced with a fresh one.Overdose symptoms may include severe headache, dizziness, blurred vision, nausea, vomiting, sweating, chest pain, fast or irregular heartbeat, difficulty breathing, fainting, or seizures.If these occur, the patch should be removed immediately and medical attention should be sought.

Choice D is wrong because management of BPH (benign prostatic hyperplasia) is not related to nitroglycerin use.

BPH is a condition

The correct answer is Choice D: Headache.

Choice A rationale: Nausea is not a common adverse effect of sublingual nitroglycerin. Nausea may occur in some patients, but it is usually mild and transient.Nausea may be related to the vasodilatory effects of nitroglycerin, which can cause hypotension and reflex tachycardia1. Nausea may also be caused by other factors, such as anxiety, stress, or food intolerance.Nausea is not a specific indicator of nitroglycerin toxicity or overdose2.

Choice B rationale: Bradycardia is not a common adverse effect of sublingual nitroglycerin. Bradycardia is a slow heart rate, usually defined as less than 60 beats per minute.Bradycardia may occur in some patients who take nitroglycerin, especially in combination with other drugs that affect the heart rate, such as beta-blockers, calcium channel blockers, or digoxin3. Bradycardia may also be caused by other factors, such as vagal stimulation, hypothyroidism, or electrolyte imbalance.Bradycardia is not a specific indicator of nitroglycerin toxicity or overdose2.

Choice C rationale: Hypertension is not a common adverse effect of sublingual nitroglycerin. Hypertension is a high blood pressure, usually defined as more than 140/90 mmHg.Hypertension may occur in some patients who take nitroglycerin, especially in those who have a history of hypertension, renal impairment, or volume overload4. Hypertension may also be caused by other factors, such as stress, pain, or caffeine intake.Hypertension is not a specific indicator of nitroglycerin toxicity or overdose2.

Choice D rationale: Headache is a common adverse effect of sublingual nitroglycerin.Headache may occur in up to 80% of patients who take nitroglycerin, especially during the first few days of therapy or after an increase in dose5. Headache may be related to the vasodilatory effects of nitroglycerin, which can cause cerebral vasodilation and increased intracranial pressure. Headache may also be caused by other factors, such as dehydration, sinusitis, or migraine. Headache is usually mild to moderate in intensity and can be relieved by analgesics, such as acetaminophen or aspirin.Headache is not a specific indicator of nitroglycerin toxicity or overdose