Final answer:
The correct understanding of nitroglycerin patch administration for a coronary artery disease patient is that the old patch should be removed and the area cleaned before applying a new one. It is a vasodilator, not associated with causing hypertension, and should not be applied on broken skin.
Step-by-step explanation:
The client who has been diagnosed with coronary artery disease and is prescribed a nitroglycerin transdermal patch should have a correct understanding of how to administer the medication safely. The correct statement indicating an understanding of safe medication administration would be, "I will remove the old patch and cleanse the area before applying a new patch." This ensures that each new dose is absorbed properly through clean skin and prevents potential skin irritation or infections. Nitroglycerin is a vasodilator that relaxes the smooth muscles in the blood vessels, which can help alleviate chest pain or angina associated with coronary artery disease.
It is incorrect to assume that nitroglycerin would lead to hypertension, as it tends to lower blood pressure. Therefore, the client should be informed that monitoring for signs of low blood pressure, rather than hypertension, is crucial. Additionally, applying a medication patch on broken skin is not recommended, as it may lead to increased absorption rates that could cause dosing issues and also increases the risk of skin irritation and infection.