👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Physiological Adaptation🔖 Free to read, print, and share
Also known as: narrowed mitral valve · tight valve between left atrium and ventricle
Mitral Valve Stenosis — medical illustration. Illustration: Blausen Medical Communications, Inc. via Wikimedia Commons, CC BY 3.0.
💡
Use this quick-reference guide to spot, treat, and prevent Mitral Valve Stenosis on the NCLEX. Keep it handy during review and on exam day!
🩺
📒 The 1-minute cheat sheet
⚠️ Cause
Rheumatic fever #1 cause
Narrowed mitral valve
🩺 Signs
Dyspnea, orthopnea, fatigue
Diastolic murmur (rumble)
Hemoptysis, A-fib
📌 Risk
A-fib → clots → emboli
Pulm HTN, RH failure
✅ Do
Anticoagulate if A-fib
Valvuloplasty/replacement
📚 Mitral Valve Stenosis — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Mitral stenosis is a narrowing of the mitral valve that obstructs blood flow from the left atrium into the left ventricle, causing blood to back up into the lungs. It most often results from rheumatic heart disease. The left atrium enlarges, predisposing to atrial fibrillation and clot formation.
🔑
Key points
Understand these first
Most common cause is rheumatic fever following untreated strep infection.
Narrowed valve backs blood up into the left atrium and lungs, causing pulmonary congestion.
Classic findings: dyspnea on exertion, fatigue, orthopnea, and a low-pitched diastolic murmur.
Left atrial enlargement promotes atrial fibrillation and mural thrombus, raising embolic stroke risk.
Patients are often anticoagulated when atrial fibrillation is present.
Treatment may include balloon valvuloplasty or surgical valve repair/replacement.
✅
Nursing priorities
What to do, in order
Monitor for signs of pulmonary congestion: dyspnea, crackles, orthopnea, hemoptysis.
Assess heart rhythm and report atrial fibrillation or irregular pulse.
Administer anticoagulants, diuretics, and rate-control agents as prescribed and monitor effects.
Pace activity and provide rest to reduce cardiac workload.
Educate on infective endocarditis prophylaxis before invasive/dental procedures when indicated.
🚩
Red flags — report now
Escalate immediately
New irregular pulse or atrial fibrillation with sudden neurologic deficit suggests embolic stroke — emergency.
Hemoptysis, severe dyspnea, or pink frothy sputum indicates pulmonary edema — report now.
Acute chest pain with shortness of breath may signal systemic embolism.
🧪
Labs & values
Numbers to know
INR 2.0-3.0 therapeutic target if anticoagulated for atrial fibrillation
🗣️
Patient teaching
What patients must know
Take anticoagulants exactly as prescribed and attend INR monitoring appointments.
Report palpitations, increased shortness of breath, or coughing up blood.
Practice good dental hygiene and inform providers of valve disease before procedures.
Balance activity with rest to avoid overtaxing the heart.
❓ Mitral Valve Stenosis: NCLEX FAQs
What are the priority nursing interventions for Mitral Valve Stenosis?
Monitor for signs of pulmonary congestion: dyspnea, crackles, orthopnea, hemoptysis. Assess heart rhythm and report atrial fibrillation or irregular pulse. Administer anticoagulants, diuretics, and rate-control agents as prescribed and monitor effects. Pace activity and provide rest to reduce cardiac workload.
What are the warning signs of Mitral Valve Stenosis a nurse must report?
New irregular pulse or atrial fibrillation with sudden neurologic deficit suggests embolic stroke — emergency. Hemoptysis, severe dyspnea, or pink frothy sputum indicates pulmonary edema — report now. Acute chest pain with shortness of breath may signal systemic embolism.
What do I need to know about Mitral Valve Stenosis for the NCLEX?
Most common cause is rheumatic fever following untreated strep infection. Narrowed valve backs blood up into the left atrium and lungs, causing pulmonary congestion. Classic findings: dyspnea on exertion, fatigue, orthopnea, and a low-pitched diastolic murmur. Left atrial enlargement promotes atrial fibrillation and mural thrombus, raising embolic stroke risk.
What patient teaching is important for Mitral Valve Stenosis?
Take anticoagulants exactly as prescribed and attend INR monitoring appointments. Report palpitations, increased shortness of breath, or coughing up blood. Practice good dental hygiene and inform providers of valve disease before procedures. Balance activity with rest to avoid overtaxing the heart.
✨
Quick Tip
Most common cause is rheumatic fever following untreated strep infection.