A nurse is caring for an adolescent who states, "I failed my math exam because the teacher doesn't like athletes." The nurse should identify that the adolescent is using which of the following defense mechanisms?

Choice A rationale:

Children who have erythema infectiosum (fifth disease) require short-term antibiotic therapy. Erythema infectiosum, also known as fifth disease, is caused by a virus and does not require antibiotic therapy. It is a self-limiting illness that does not respond to antibiotics.

Choice B rationale:

Administration of childhood immunizations will prevent exanthem subitum (roseola infantum) Exanthem subitum, or roseola infantum, is typically a viral illness and is not prevented by childhood immunizations. It is caused by human herpesvirus 6 (HHV-6) and human herpesvirus 7 (HHV-7)

Choice C rationale:

Restrict fluids for children who have pertussis. Restricting fluids for children with pertussis is not recommended. Pertussis, also known as whooping cough, can cause severe coughing spells, and it is important to ensure that affected children stay well-hydrated. Restricting fluids can lead to dehydration, which can worsen the condition.

Choice D rationale:

Isolate children who have varicella until the vesicles have formed crusts. Isolation of children with varicella (chickenpox) until the vesicles have formed crusts is a standard infection control measure. Varicella is highly contagious, and isolating affected individuals helps prevent the spread of the virus to others. Once the vesicles have crusted over, the risk of transmission is significantly reduced.

Choice A rationale:

Applying a cold compress to the client's calf is not the priority in this situation. The client is reporting pain in the calf, which could be indicative of deep vein thrombosis (DVT), a potentially serious condition. Monitoring the client's oxygen saturation (pulse oximetry) is a more appropriate action to assess for possible DVT complications, such as a pulmonary embolism.

Choice B rationale:

Monitoring the client's pulse oximetry is the correct action in this scenario. Pain in the calf can be a symptom of DVT, which can lead to reduced blood flow and potential oxygenation issues. Monitoring the client's oxygen saturation levels can help identify any oxygenation problems early.

Choice C rationale:

Instructing the client to massage the calf gently is not recommended in this situation, as it may dislodge a clot if DVT is present. Massaging the calf can be harmful and is contraindicated when DVT is suspected.

Choice D rationale:

Maintaining the leg in a dependent position while in bed is not a recommended action in this case. Elevating the leg can help reduce swelling and improve venous return, but it should be done cautiously, especially if DVT is suspected. Monitoring the client's condition and oxygen saturation takes precedence.