A nurse is caring for a client with severe mitral stenosis who is scheduled for a mitral valve replacement. Which nursing intervention should be the priority in the preoperative period?

Severe mitral stenosis increases left atrial pressure, risking pulmonary edema. Priority is monitoring for pulmonary edema and maintaining oxygen saturation above 95% to prevent life-threatening respiratory complications. Other options may be harmful or less urgent.

Clinical Context and Pathophysiology
Severe mitral stenosis creates a mechanical obstruction to blood flow from the left atrium into the left ventricle during diastole. This obstruction leads to increased left atrial pressure, which is transmitted backward into the pulmonary veins and pulmonary capillary bed. The result is a state of chronic pulmonary venous congestion with a high risk of decompensation into acute pulmonary edema. Any factor that increases blood return to the right heart and pulmonary circuit, such as excessive fluid intake, can further elevate pulmonary capillary hydrostatic pressure and precipitate life-threatening respiratory failure. In the preoperative period, the priority is to maintain hemodynamic stability and prevent this cascade.

Analysis of the Priority Intervention
The correct answer is to monitor for signs of pulmonary edema and maintain oxygen saturation above 95%. This intervention directly addresses the most immediate and life-threatening complication of severe mitral stenosis. The pathophysiological hallmark of this condition is a fixed limitation in forward flow, making the pulmonary vasculature exquisitely sensitive to volume overload. A structured, multidisciplinary approach to perioperative care, as highlighted in the context of minimally invasive mitral valve surgery, emphasizes meticulous monitoring and stabilization to optimize outcomes . A core component of this stabilization is ensuring adequate oxygenation and early detection of respiratory compromise, which aligns with this nursing priority.

Critique of Alternative Options
- Encourage increased fluid intake to maintain adequate preload: This intervention is contraindicated. In severe mitral stenosis, the left ventricle is underfilled due to the valve obstruction, not a lack of total body volume. Increasing fluid intake will worsen pulmonary congestion by raising left atrial and pulmonary venous pressures, directly increasing the risk of pulmonary edema.
- Administer prescribed anticoagulants to prevent valve thrombosis: While anticoagulation is a key therapy for preventing thromboembolism, particularly in mitral stenosis with atrial fibrillation, it is not the immediate preoperative priority. The risk of thrombosis is a chronic concern, whereas acute pulmonary edema is an immediate threat to life. Furthermore, anticoagulation status must be carefully managed in the immediate preoperative period to balance bleeding and clotting risks, often requiring discontinuation or bridging.
- Provide high-sodium diet to support cardiac contractility: This is incorrect. Sodium promotes fluid retention, which would exacerbate volume overload and pulmonary congestion. A sodium-restricted diet is a cornerstone of medical management for mitral stenosis to minimize preload and symptoms of heart failure. The goal is to reduce, not increase, the workload on the right ventricle and the congested pulmonary circuit.

Integration of Perioperative Principles
The rationale for this priority is reinforced by the principles of enhanced recovery and multidisciplinary care in cardiac surgery. A key focus of preoperative optimization is risk stratification and stabilization, which includes managing heart failure symptoms and ensuring respiratory stability . The multidisciplinary heart team approach to mitral valve surgery relies on each member, including nursing, to execute specific perioperative protocols that prevent complications and prepare the patient for a successful procedure . For a patient with severe mitral stenosis, the nurse's role in this team is to vigilantly monitor for the primary complication—pulmonary edema—and intervene to maintain oxygen saturation above 95%, thereby preventing hypoxic organ injury and ensuring the patient is in optimal condition for surgery.