A nurse is caring for a client with severe mitral stenosis w… | 마이메르시 MyMerci
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문제

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?

해설
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.

심화 해설

Core Nursing Explanation Key Concept Analysis: This question assesses the priority nursing intervention for a patient with severe mitral stenosis in the preoperative period. The core pathophysiological mechanism is obstruction of blood flow from the left atrium to the left ventricle. This leads to increased left atrial pressure, which is transmitted backward into the pulmonary circulation, causing pulmonary venous hypertension. This creates a constant risk for pulmonary edema, a life-threatening complication. The priority is always to maintain the patient's airway, breathing, and circulation (ABCs).

Answer Rationale: Key Point! The correct answer is ② Monitor for signs of pulmonary edema and maintain oxygen saturation above 95%. This directly addresses the most immediate and life-threatening risk for this patient. Monitoring includes assessing for dyspnea, orthopnea, crackles (rales) on lung auscultation, tachypnea, and hypoxemia. Maintaining oxygen saturation is a critical intervention to prevent tissue hypoxia and further cardiac strain. This aligns with the ABC priority framework and the principle of preventing deterioration before surgery.

Distractor Analysis:
• Watch out for confusion! Option ①, "Encourage increased fluid intake," is contraindicated. Increasing preload (the volume of blood returning to the heart) in a patient with a fixed obstruction like mitral stenosis will further elevate left atrial and pulmonary pressures, potentially precipitating acute pulmonary edema. Fluid restriction is often a key management strategy.
• Option ③, "Administer prescribed anticoagulants," is important for patients with mitral stenosis who are often in atrial fibrillation (AFib) due to left atrial enlargement, to prevent stroke. However, it is not the immediate preoperative priority for preventing acute decompensation. Furthermore, anticoagulation management (like holding warfarin and bridging with heparin) is a specific protocol, not a general priority intervention.
• Option ④, "Provide high-sodium diet," is harmful. A high-sodium diet promotes fluid retention, which increases blood volume and preload, exacerbating the risk of pulmonary congestion and edema. These patients are typically placed on a sodium-restricted diet.

Related Concepts: The management of mitral stenosis focuses on reducing pulmonary congestion, controlling heart rate (especially in AFib), preventing complications (embolism, endocarditis), and preparing for definitive treatment (valvuloplasty or valve replacement). Preoperative care aims to stabilize the patient's condition to safely undergo anesthesia and surgery.

Concept Summary • Pathophysiology: Stenotic mitral valve → Impaired LV filling → Increased LA pressure → Pulmonary venous congestion → Risk of Pulmonary Edema.
• Preoperative Priority: ABCs. Monitor and prevent respiratory failure from pulmonary edema.
• Key Assessments: Lung sounds (crackles), respiratory rate/effort, oxygen saturation, heart sounds (opening snap, diastolic murmur), signs of right heart failure (JVD, edema) in late stages.
• General Management: Diuretics (to reduce preload), rate control for AFib, anticoagulation for AFib, sodium/fluid restriction, endocarditis prophylaxis.

Side-by-Side Comparison!
Valve LesionPrimary ProblemKey Preload ConsiderationPriority Nursing Concern
Mitral StenosisObstruction to LV fillingAvoid increased preload (Fluid restriction)Prevent Pulmonary Edema
Aortic StenosisObstruction to LV ejectionMaintain adequate preload (Avoid hypovolemia)Prevent Syncope, Angina, HF
Mitral RegurgitationBackflow into LA during systoleAfterload reduction is keyManage HF, Monitor for pulmonary congestion

Anatomy, Physiology & Pharmacology Points • Anatomy: The mitral valve (bicuspid valve) lies between the left atrium and left ventricle.
• Physiology: Preload: Volume stretching the ventricles at end-diastole. In MS, increased preload worsens congestion.
Afterload: Resistance the ventricle must overcome to eject blood. Not the primary issue in pure MS.
• Pharmacology: Diuretics (e.g., Furosemide): Reduce circulating volume and pulmonary venous pressure.
Beta-blockers / Calcium channel blockers: Control heart rate, allowing more time for diastolic filling across the stenotic valve.

Memory Tips • MS = "Makes Stuff" back up into the lungs. Think of the valve as a narrow door; pushing more fluid (increased preload) just causes a bigger backup.
• ABCs always come first. Before worrying about long-term meds like anticoagulants, ensure the patient can breathe.

High-Frequency NCLEX Topics NCLEX loves to test priority-setting and contraindicated actions. Mitral stenosis is a classic scenario where a seemingly benign action (encouraging fluids) is actually dangerous. Always link the pathophysiology to the nursing intervention.

Watch Out for Question Variations! • Instead of asking for the priority intervention, the question might ask: "Which finding requires immediate notification of the provider?" (Answer: New onset of crackles in lung bases and dyspnea).
• Or, it could shift to postoperative care: "After mitral valve replacement, the nurse should monitor for which complication?" (Answer: Signs of cardiac tamponade, arrhythmias, or bleeding).

임상 시나리오

Nursing Clinical Practice Guide Clinical Scenario: You are the nurse on a cardiac surgical unit. Mrs. Johnson, 68, is admitted for a scheduled mitral valve replacement tomorrow. She has a history of severe mitral stenosis, NYHA Class III heart failure (symptoms with minimal activity), and is on furosemide 40mg daily. She reports increasing shortness of breath when lying flat over the past two nights.

Nursing Intervention Strategy:
1. Assessment: Perform a focused respiratory and cardiac assessment every 4 hours and as needed. Auscultate lung sounds (posterior and anterior), noting any new or worsening crackles. Monitor respiratory rate, pattern, and oxygen saturation via pulse oximetry. Assess for orthopnea (number of pillows used), jugular venous distension (JVD), and peripheral edema. Listen to heart sounds, specifically for the loud S1 and diastolic rumble of MS.
2. Planning & Implementation: The goal is to maintain SpO2 > 95% and prevent acute pulmonary edema. • Positioning: Keep the head of the bed elevated (at least 45 degrees) to reduce pulmonary congestion and ease breathing.
• Oxygen Therapy: Apply supplemental oxygen via nasal cannula as prescribed to maintain target saturation. Have non-rebreather mask available at bedside for rapid response if needed.
• Medication Administration: Administer scheduled diuretics on time. Monitor intake and output strictly (goal: negative or balanced fluid balance). Weigh the patient daily.
• Dietary Management: Collaborate with dietary services to provide a strict 2-gram sodium diet. Educate the patient on avoiding high-sodium foods and limiting fluid intake as ordered.
3. Patient Education: Explain why fluid and salt restriction are necessary before surgery ("to keep the fluid off your lungs so you can breathe easier and be safer for surgery"). Teach her to report increased shortness of breath, coughing, or a feeling of "drowning" immediately.

Patient Safety and Precautions:
• Contraindication: Do NOT encourage liberal fluid intake. This is a critical safety point.
• Monitoring: Be vigilant for a sudden drop in oxygen saturation, increased work of breathing, or anxiety—these are early signs of decompensation.
• Medication Caution: If the patient is on anticoagulants (e.g., warfarin), follow the specific bridging protocol ordered by the cardiothoracic team (typically stopping warfarin and starting a heparin infusion). Monitor PTT/INR accordingly.

Nursing Procedure & Medication Flow Managing a Patient on a Diuretic (Furosemide) Preoperatively:
1. Administer the dose early in the day to prevent nocturia and sleep disruption.
2. Monitor for electrolyte imbalances, especially hypokalemia (normal K+ 3.5-5.0 mEq/L), which can precipitate arrhythmias. Check BMP (Basic Metabolic Panel) results.
3. Assess for orthostatic hypotension after administration—have the patient rise slowly.
4. Evaluate effectiveness: Reduction in dyspnea, decreased crackles, weight loss, and increased urine output.

A Word from Your Senior Nurse "Remember, the patient with severe mitral stenosis is walking a tightrope. Their heart is struggling to manage the fluid load. Your vigilant assessment and careful management of their fluid balance are what keep them stable and safe for their life-changing surgery. On the NCLEX and in practice, always ask yourself: 'What is the biggest threat to this patient's life right now?' For this patient, it's not the surgery tomorrow—it's the fluid in their lungs today. Your actions to prevent pulmonary edema make you their frontline guardian."

핵심 개념

  • Mitral Stenosis — A valvular heart disease where the mitral valve opening is narrowed, obstructing blood flow from the left atrium to the left ventricle during diastole.
  • Pulmonary Edema — A life-threatening condition where fluid accumulates in the alveoli and interstitial spaces of the lungs, often due to left-sided heart failure or fluid overload.
  • Preload — The volume of blood in the ventricles at the end of diastole, which stretches the cardiac muscle fibers before contraction. In mitral stenosis, increased preload is detrimental.
  • Orthopnea — Shortness of breath that occurs when lying flat, relieved by sitting up or standing. A classic symptom of left-sided heart failure and pulmonary congestion.
  • Diuretic — A medication that promotes the excretion of water and sodium by the kidneys, used to reduce preload and manage fluid overload in conditions like heart failure and mitral stenosis.

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