Final answer:
The nurse must wear gloves when administering topical nitro paste and should not apply it directly to open wounds. It should be applied to intact skin and covered with an airtight dressing.
Step-by-step explanation:
When administering topical nitro paste, the nurse must take precaution by wearing gloves. This is important to protect both the nurse and the patient from potential harm or contamination. The nitro paste should not be applied directly to open wounds as it is intended for external use only. Instead, it should be applied to intact skin and not massaged into the skin. To ensure proper absorption and effectiveness, the nurse should cover the applied nitro paste with an airtight dressing.