After cardiac surgery, a patient reports moderate incisional pain and limited ability to deep breathe. What is the most appropriate nursing action?

Choice A rationale Applying heat therapy directly to a fresh surgical incision is contraindicated due to the risk of increasing local vasodilation. Increased blood flow to the surgical site can exacerbate postoperative edema and potentially cause thermal injury to fragile tissues. While heat may relax muscles, the primary concern in the immediate postoperative period after cardiac surgery is maintaining hemodynamic stability and preventing hemorrhage or excessive swelling at the sternotomy or donor sites. Choice B rationale Delaying intervention for 30 minutes when a patient is already experiencing moderate pain and respiratory limitation is clinically inappropriate. Postoperative cardiac patients are at high risk for atelectasis and pneumonia if they cannot perform deep breathing or use incentive spirometry. Pain acts as a physiological barrier to lung expansion. Waiting to reassess without providing an intervention allows the pulmonary status to deteriorate and increases the metabolic stress response associated with uncontrolled pain. Choice C rationale Reducing physical activity to minimize pain is counterproductive to the recovery goals of a cardiac surgical patient. Early mobilization and pulmonary hygiene are essential to prevent complications like deep vein thrombosis, pulmonary embolism, and skin breakdown. While activity should be paced, total reduction in movement leads to venous stasis and decreased functional residual capacity in the lungs. Managing the pain effectively allows the patient to participate in necessary activity rather than avoiding it. Choice D rationale Administering prescribed analgesics is the priority action to facilitate respiratory effort. Effective pain management reduces splinting, which is the involuntary muscle guarding that limits chest wall excursion. By lowering the pain level, the patient can achieve deeper inspiration, improving alveolar ventilation and gas exchange. Combining pharmacological relief with nursing encouragement for deep breathing exercises addresses both the subjective discomfort and the objective physiological need to prevent postoperative pulmonary complications effectively.