A nurse is caring for a client who reports taking 0.5 oz of diphenhydramine elixir every night to sleep. The concentration on the client's bottle reads diphenhydramine 12.5 mg/5 mL. How many mg of diphenhydramine is the client taking each night? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

A. "I will take ibuprofen for mild pain": NSAIDs like ibuprofen can lead to sodium and fluid retention, which can exacerbate heart failure by increasing preload and worsening edema. They can also reduce the effectiveness of diuretics and ACE inhibitors, both of which are commonly used in heart failure management. Acetaminophen is generally preferred for pain relief as it does not contribute to fluid retention.

B. "I will weigh myself every other day": Daily weight monitoring is essential for detecting fluid retention early, as a sudden increase of 2–3 pounds in 24 hours or 5 pounds in a week can indicate worsening heart failure. Weighing every other day may delay the recognition of fluid overload, increasing the risk of complications such as pulmonary congestion and hospitalization.

C. "I will keep an exercise diary": Regularly tracking physical activity helps assess functional status and detect any decline in exercise tolerance, which could indicate worsening heart failure. An exercise diary allows the healthcare team to adjust activity levels appropriately, ensuring that the client remains active without overexertion. This approach also promotes adherence to a safe and structured exercise regimen, improving overall cardiovascular health.

D. "I will expect swelling in my feet and ankles": While mild peripheral edema can occur, it should never be considered normal in heart failure management. Swelling in the lower extremities suggests worsening fluid retention and should be promptly reported to the healthcare provider. Early intervention, such as medication adjustments or dietary modifications, can help prevent further decompensation and reduce the risk of hospitalization.

• Infection: Poor glycemic control, indicated by an elevated hemoglobin A1c of 9.5%, leads to impaired immune function, delayed wound healing, and increased risk of postoperative infections. Chronic hyperglycemia promotes bacterial growth, reduces leukocyte function, and compromises vascular integrity, further predisposing the client to infections.
• Deep vein thrombosis (DVT): Postoperative immobility, increased coagulation, and endothelial injury increase DVT risk. However, BUN of 15 mg/dL is within the normal range and does not indicate dehydration or hemoconcentration, which would contribute to thrombus formation.
• Hypovolemia: Reduced blood volume typically presents with signs such as hypotension, tachycardia, and elevated BUN/creatinine ratio. Preoperative hypertension does not indicate hypovolemia and is more commonly associated with chronic vascular resistance rather than acute fluid loss.
• BUN of 15 mg/dL: A BUN level within the normal range does not suggest an increased risk for DVT or fluid imbalance. It primarily reflects renal function and hydration status, neither of which are significantly altered in this case.
• Preoperative hypertension: While chronic hypertension is a cardiovascular risk factor, it does not indicate hypovolemia, which would present with dehydration-related signs such as orthostatic hypotension, tachycardia, and decreased urine output.
• Hemoglobin A1c: A value of 9.5% indicates poor long-term glycemic control, which impairs immune function and slows wound healing. Elevated glucose levels reduce neutrophil function, impair macrophage activity, and increase oxidative stress, all of which contribute to a heightened infection risk.