Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

Mitral Regurgitation

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In one line

·Each heartbeat sends some blood backward into the left atrium instead of forward into the body.

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Normal physiology

·The mitral valve sits between the left atrium (top chamber) and the left ventricle (bottom chamber). It opens to let blood pour down, then closes to keep blood from flowing backward when the ventricle squeezes.

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What goes wrong

·The mitral valve cannot close all the way, so blood leaks backward into the atrium during every heartbeat instead of going forward to the body.

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Hallmark signs

·A blowing sound (murmur) during the heart squeeze, loudest at the top of the heart and spreading toward the left armpit
·Feeling short of breath, especially when lying flat or during activity
·Feeling very tired and weak, even with light tasks
·Swelling in the ankles, feet, or belly
·A fast or fluttering heartbeat (palpitations)
·The point where you feel the heart's strongest tap (PMI, or point of maximal impulse) is shifted down and to the left
·An extra low-pitched heart sound (S3 gallop) right after the usual 'lub-dub'
·Coughing, especially at night or when lying down, sometimes with pink frothy spit

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Red flags · escalate now

·Sudden, severe shortness of breath at rest or waking you from sleep (sign of acute heart failure or flash pulmonary edema (fluid flooding the lungs)—fluid flooding the lungs fast)
·Coughing up pink, frothy spit (sign that fluid and blood are filling the lungs under high pressure)
·New chest pain, dizziness, or fainting (may mean the heart can't keep up with the body's needs or dangerous heart rhythms like ventricular a fast heart rate (tachycardia) are starting)
·Rapid weight gain or swelling that gets worse quickly over days (sign that fluid is building up fast and the heart is decompensating)
·Lips or skin turning blue, especially around the mouth or fingertips (sign the body isn't getting enough oxygen)

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Workup

·Transthoracic echocardiogram (TTE)
·Transesophageal echocardiogram (TEE)
·Chest X-ray
·Electrocardiogram (ECG)
·Brain natriuretic peptide (BNP) or N-terminal pro-BNP (NT-proBNP)
·Cardiac catheterization with left ventriculography

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Treatment

·Vasodilators (sodium nitroprusside or nitroglycerin) plus diuretics (furosemide) in acute severe MR
·Intra-aortic balloon pump (IABP) in cardiogenic shock from acute severe MR
·Urgent mitral valve repair or replacement surgery
·ACE inhibitors or ARBs, beta-blockers, and aldosterone antagonists in chronic secondary MR from heart failure
·MitraClip or transcatheter edge-to-edge repair (TEER) in select patients with chronic secondary MR
·Anticoagulation (warfarin or direct oral anticoagulants) if atrial fibrillation (an irregular, quivering heartbeat) is present
·Antibiotic prevention (prophylaxis) before dental or invasive procedures after valve surgery

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NCLEX trap

·Long-term primary mitral regurgitation (the valve itself is broken) needs surgery only when BOTH the patient has symptoms AND the left ventricle starts to fail — meaning the heart's squeeze gets weaker (ejection fraction drops to 30–60%), or the left ventricle stretches too big (end-systolic dimension over 40 mm), or the patient develops atrial fibrillation (an irregular, quivering heartbeat) (the top heart chambers quiver instead of beat), or the pressure in the lung arteries gets high (pulmonary high blood pressure (hypertension)). Just being a little short of breath is NOT enough by itself — you have to catch the left ventricle damage BEFORE it becomes permanent. Medicine buys time but does NOT stop the leak. The real fix is surgery.
·Sudden severe mitral regurgitation from a papillary muscle rupture is a surgical emergency — one of the small muscles that holds the mitral valve flaps shut tears off during a heart attack, and blood floods backward into the lungs. Yes, give water pills (diuretics) and a medicine like nitroprusside (a fast blood-vessel opener that lowers the pressure the heart has to push against) to reduce the load on the left side and buy a little time, but the REAL fix is urgent surgery to repair or replace the valve. You may also need an intra-aortic balloon pump (a device inside the aorta that helps the heart push blood forward) as a bridge to surgery. Water pills alone will FAIL — the patient needs the valve fixed or replaced, or they will die from cardiogenic shock (the heart cannot pump enough blood to keep the body alive).
·Mitral regurgitation causes a holosystolic murmur (also called pansystolic — a sound that lasts the whole time the heart is squeezing) because the valve is leaking backward during systole when it should be sealed tight. The murmur starts the moment systole starts (S1, the first heart sound) and lasts until systole ends (S2, the second heart sound). Do NOT confuse it with diastolic murmurs — those come from mitral narrowing (stenosis) (the valve is stuck narrow and blood has trouble flowing FORWARD during filling). In mitral regurgitation, the problem is leaking BACKWARD during squeezing.
·Primary mitral regurgitation (the valve leaflets are torn, floppy, or damaged) needs surgery or repair when atrial fibrillation (an irregular, quivering heartbeat) develops, because the atrial fibrillation means the left atrium (the top left heart chamber) is stretching and getting scarred — the valve is getting worse and the window to repair it is closing fast. Secondary mitral regurgitation (the valve leaflets are normal but the left ventricle is so big and weak that the valve cannot close all the way) should get better heart-failure medicine first — beta-blockers, ACE inhibitors or ARBs (medicines that relax blood vessels and help the heart remodel), and sometimes a device like CRT (a special pacemaker) or an LVAD (a pump that helps the left ventricle do its job). Different upstream breaks need different fixes — you do NOT operate on a valve that is not broken; you shrink the ventricle and the leak often gets smaller on its own.
·The PMI moves laterally (toward the armpit) and downward in mitral regurgitation because the left ventricle gets bigger over time — the heart has to pump MORE blood forward to make up for what is leaking backward, so the muscle stretches and the chamber dilates (gets bigger inside). This is NOT the leak pushing the heart sideways; it is the heart trying to keep forward blood flow going and slowly failing in the process. The left ventricle remodels (changes shape and size) to handle the extra volume, and eventually that remodeling becomes harmful and irreversible if you wait too long to fix the valve.
·Secondary mitral regurgitation (also called functional MR) happens because the left ventricle is huge and weak — the valve leaflets are normal but they cannot reach each other to seal because the ventricle is stretched so far apart. The leak will often improve or even disappear if you treat the heart failure and the left ventricle shrinks back down — the valve flaps come back together and the leak gets smaller. Valve replacement in secondary MR often FAILS because the real problem is the giant weak ventricle, NOT the valve itself. Fix the ventricle first with guideline-directed medical therapy (GDMT — beta-blockers, ACE inhibitors or ARBs or ARNI, SGLT2 inhibitors, and aldosterone blockers), devices like CRT, or even transplant. If the leak stays severe and the patient stays sick despite all that, THEN consider MitraClip (a clip that holds the valve leaflets together) or surgery — but medicine comes first.

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