A client with a history of atrial fibrillation is prescribed warfarin. Which laboratory value should the nurse monitor to assess the medication’s effectiveness?

Choice A reason: A foreign body in the eye may cause irritation or damage but is not a contraindication for ketorolac, a nonsteroidal anti-inflammatory drug (NSAID) used for pain and inflammation. The nurse would ensure removal of the foreign body first, but ketorolac can be used post-removal if indicated.

Choice B reason: Radiation exposure, such as from UV light, may cause photokeratitis but is not a specific contraindication for ophthalmic ketorolac. The medication reduces inflammation and pain, which may be beneficial in such cases. The nurse should assess for other ocular conditions, but radiation exposure alone does not preclude its use.

Choice C reason: Chemical burns require immediate irrigation and specific treatments based on the chemical involved. Ketorolac may reduce pain and inflammation post-irrigation, but it is not contraindicated. The nurse should prioritize burn management, but chemical burns do not inherently prohibit ketorolac use compared to corneal abrasions.

Choice D reason: Corneal abrasions are a contraindication for ophthalmic ketorolac, as NSAIDs can delay corneal healing and increase the risk of complications like corneal ulceration. The nurse must review the medical record to confirm the absence of abrasions, as ketorolac is typically used for postoperative pain, not traumatic corneal injuries.

Choice A reason: Neutropenia, a low neutrophil count, is a common chemotherapy side effect due to bone marrow suppression, increasing infection risk. Monitoring neutrophil counts is critical, as infections in breast cancer patients can be life-threatening, making it the priority side effect to assess.

Choice B reason: Hypertension is not a typical chemotherapy side effect, though some agents cause cardiovascular effects. Neutropenia is more common, compromising immunity, making it the priority to monitor, as infections pose an immediate threat in breast cancer patients on chemotherapy.

Choice C reason: Hyperkalemia is rare with chemotherapy, except in tumor lysis syndrome. Neutropenia is a frequent side effect, increasing infection risk due to marrow suppression, making it the priority to monitor, as it directly impacts patient safety during breast cancer treatment.

Choice D reason: Weight gain is not a primary chemotherapy side effect; weight loss is more common due to nausea. Neutropenia is critical to monitor, as low neutrophils increase infection risk, requiring urgent intervention in breast cancer patients undergoing chemotherapy.