A nurse in an assisted-living facility is reinforcing teaching with staff members about preparing for an external chemical disaster. Which of the following instructions should the nurse include?

The presence of edema and coolness around the catheter's insertion site suggests that infiltration may have occurred. Infiltration refers to the unintended leakage of fluid into the surrounding tissues instead of flowing into the vein. It can lead to tissue damage and compromised circulation. Stopping the infusion is the initial priority to prevent further infiltration and minimize potential harm to the client.

Applying a warm compress may be appropriate to promote comfort and circulation in some cases, but it should be done after stopping the infusion and assessing the severity of the infiltration.

Documenting the infiltration is necessary for accurate record-keeping and to communicate the occurrence to the healthcare team. However, it is not the first immediate action required in this situation.

Elevating the arm can help reduce swelling and promote venous return. It can be done after stopping the infusion, but it is not the first action to address the potential infiltration.

Chemotherapy treatments, which are used to treat cancer, can suppress the immune system and weaken the body's ability to respond to vaccines. As a result, receiving a live attenuated vaccine like the varicella immunization can pose a risk of severe complications for individuals undergoing chemotherapy. Therefore, it is contraindicated to administer the varicella vaccine in this case.

Medications for a cardiac anomaly, clear rhinorrhea, and two diarrhea stools in the last day are not contraindications for receiving a varicella immunization.

While medications for a cardiac anomaly and certain medical conditions may require special consideration or precautions when administering vaccines, they are not absolute contraindications for the varicella vaccine. The decision to administer the vaccine would depend on the individual's specific circumstances and the healthcare provider's assessment. Clear rhinorrhea (runny nose) and two diarrhea stools in the last day are considered minor illnesses and do not contraindicate the varicella vaccine. Generally, mild illnesses without fever or systemic symptoms do not pose a significant risk when receiving vaccines. However, it is always important to assess the overall health status of the individual and consult with a healthcare provider if there are concerns.