A nurse is caring for a client receiving external beam radiation therapy for lung cancer. Which nursing intervention is the highest priority to ensure client safety during the treatment period?

For a client receiving external beam radiation for lung cancer, the highest priority is maintaining the integrity of the treatment field. The small tattoos or painted marks placed by the radiation oncology team are the sole reference for daily positioning. Inadvertent removal or alteration can lead to a geographic miss, where the tumor is under-dosed and healthy tissue is unnecessarily irradiated. Nurses must inspect these markings at every encounter and instruct the client to pat the area dry gently after showering rather than rubbing.

The skin within the treatment portal becomes a first-level safety concern. Standard nursing interventions include washing the area with lukewarm water and mild, non-deodorant soap using the palm of the hand only. Lotions, deodorants, or powders are typically withheld unless explicitly approved by radiation oncology, as they can act as bolus material and alter the surface dose. The client should wear loose-fitting, soft cotton clothing to minimize friction and avoid adhesive tapes over the marked field. Additionally, irradiated skin is permanently photosensitive; direct sun exposure must be avoided, and physical sun protection is required even after therapy ends.

The client's reported fatigue is an expected cumulative side effect. Energy conservation strategies should be prioritized, such as scheduling activities during peak energy times and incorporating short rest periods. For the complaint of mild dysphagia, a nutrition consult for a soft, bland diet is appropriate. The nurse should monitor for signs of esophageal candidiasis, which can mimic radiation esophagitis, and encourage the client to avoid extremely hot, spicy, or acidic foods that could further irritate the friable mucosa. Weight should be tracked weekly to ensure caloric intake remains adequate during the treatment course.