What Happens When the Chordae Tendineae Rupture?

The chordae tendineae are thin cords that hold the heart’s valve flaps shut. When one breaks, the valve starts to leak backward. How much that matters depends mostly on how big the tear is and how fast it happens, from barely noticeable to a medical emergency. Because the problem is mechanical, it is usually very fixable, most often by giving the valve new artificial cords.¹

What a Torn Chord Does to Your Heart Valve

Each time the heart beats, the chords carry the force of the closing valve flaps down to small muscles in the heart wall.² That anchoring stops the flaps from bulging backward and letting blood leak.³ Most ruptures affect the mitral valve, which sits between the left upper and left lower chambers.

How bad the leak gets depends on how many chords snap and which part of the flap they held. A single thin chord may cause only a small leak, while a main chord can leave a large section loose.

Once a chord tears, the attached part of the flap whips backward into the upper chamber every time the heart squeezes.⁴ The edges of the valve no longer meet, so there is a gap that blood leaks through.⁵ Doctors call the loose flap a “flail leaflet,” a term you may see on a scan report.⁶ The backward leak is called mitral regurgitation, often written “MR” on reports.⁷

With each squeeze, some blood from the left lower chamber takes the easier route back through the gap instead of out to the body. The heart ends up pumping the same blood more than once to deliver the usual amount. The upper chamber also receives that leaked blood on top of its normal supply from the lungs, so pressure there can rise and back up toward the lungs.

A few other words on a report are worth decoding. “Prolapse” means a flap sags backward, while “flail” means it has lost support entirely. Severity is usually graded as mild, moderate or severe. “Posterior” or “anterior” tells you which flap is affected, and that matters for repair.

Symptoms and Why Sudden Tears Are an Emergency

After a sudden tear, the heart chambers have had no time to stretch and cope with the extra blood sloshing back and forth.⁸ Pressure in the left upper chamber shoots up and is pushed back into the lungs.⁹ Fluid then leaks into the lungs, while less blood is pumped out to the body.¹⁰

The typical sign is sudden, severe shortness of breath, often worse when lying flat.¹¹ Palpitations or an irregular heartbeat can come with it.¹² Some people cough up frothy or pink-tinged fluid from flooded lungs. This needs an ambulance, not a wait-and-see approach. Sudden severe breathlessness that comes on within hours, does not ease with rest, or stops you speaking in full sentences is a reason to call emergency services rather than drive yourself or wait for a morning appointment.

Paramedics and emergency staff will usually check oxygen levels, listen to the lungs, record the heart rhythm and give oxygen before any scan is arranged. Because a rupture can look like a heart attack or a severe chest infection, staff may test for those first, and the valve problem is often found on a heart ultrasound shortly afterward.

Symptoms can also creep in slowly or come and go, like ordinary heart failure.¹³ The severity depends on how many chords break and how fast.¹⁴ Over weeks or months, the heart gradually enlarges to cope with the leak. Because the left chambers have time to stretch and take up the extra blood, pressure in the lungs stays lower for longer. That adaptation can hide the problem for months or years, and some people are diagnosed only when a scan is done for another reason. Eventually the stretched chamber can no longer keep up, and breathlessness on stairs, tiredness or swollen ankles appear. A further chord breaking can make a slow leak suddenly worse, so feeling fine doesn’t mean the heart isn’t under strain, and follow-up scans still matter.

A sudden severe leak can also be hard to detect by ear. The heart murmur can be short and quiet,¹⁵ so a doctor listening with a stethoscope may not hear the usual loud one. Sudden unexplained breathlessness should therefore be checked with a scan, not ruled out by a normal-sounding exam.

Why Chords Break

The commonest cause of mitral valve disease in Western countries is a gradual weakening in which a jelly-like substance builds up and softens the valve and its chords.¹⁶ The chords then stretch or snap, often with no obvious trigger.¹⁷ Many tears happen without any known cause and are called primary or spontaneous ruptures.¹⁸

“Spontaneous” means no outside cause was found, not that the cause is unknowable. The underlying weak tissue is usually something you were born with or that developed slowly over years, and you could not feel it. Lifting, exercising or a cough does not usually snap a healthy chord, so even if a tear seems to follow such a moment, the weak tissue, not the activity, is generally the real cause.

A sudden rupture can also be a complication of infective endocarditis, a bacterial infection of the heart valve.¹⁹ In one hospital group, infection explained nearly half of ruptures, 9 of 20.²⁰ The bacteria settle on the valve and form growths that destroy tissue, including the thin chords, which can then give way. Infection tends to come with fever, night sweats, tiredness and weight loss over days to weeks, though not always all of them. Fever, chills or recent dental work before the symptoms are worth mentioning to your doctor. Blood cultures, taken before antibiotics are started, are the usual way to look for bacteria in the blood. If infection is confirmed, treatment typically involves a long course of intravenous antibiotics, and surgery may be needed because of the valve damage.

A blunt blow to the chest, such as in a car crash, can tear chords, but this is unusual.²¹ Connective tissue disorders and heart attacks have been linked but turn out to be only occasional causes.²²

How Doctors Confirm a Ruptured Chord

An echocardiogram, an ultrasound of the heart, shows the loose flap flicking into the upper chamber as the heart squeezes.²³ It also shows that the valve edges no longer meet.²⁴

The standard scan is done through the chest wall with gel and a probe. It is painless and takes about half an hour. A more detailed scan passes a probe down the throat under sedation to see the valve closely, and surgeons often want that view to plan exactly which chords to replace. Other tests, like a chest X-ray or an ECG, check the lungs and heart rhythm.

The person doing the scan looks at the valve from several angles to see which flap is affected and how far it moves backward. Colour Doppler images show the leak as a jet of blood, and its width and direction help estimate how severe it is. The jet is often thrown away from the loose flap, so its direction is one clue, alongside the images of the valve itself, to which flap is the problem. The scan also measures the size of the heart chambers and how well the lower chamber is pumping, which shows how much strain the leak has caused.

Sometimes the first scan is not enough. A scan through the chest wall can be limited by body build, lung disease or a poor view. In an unstable patient the quick scan may be enough to show the diagnosis, with a closer look done later or in the operating room. The throat probe requires fasting beforehand and sedation, and the throat can be sore for a day afterward. It carries a rare risk of throat injury, which is why staff check for swallowing problems first.

Emergency Treatment to Stabilize the Heart

Treatment includes IV water pills to clear lung fluid, drugs that widen blood vessels, and drugs that strengthen the heartbeat.²⁵ Widening the vessels makes it easier for blood to go forward instead of leaking back.²⁶ Some very sick patients need a temporary heart support device.²⁷ Drugs can’t reattach a broken chord, but they buy time to make the heart and lungs strong enough for a procedure.

Water pills given through a vein work within minutes to hours, making the kidneys remove salt and water so the lungs can clear. Vessel-widening drugs lower the resistance the heart pumps against, so a larger share of each beat goes to the body. Drugs that strengthen the heartbeat are used when blood pressure is low or the body is not getting enough blood, and they are generally given in intensive care. Because several of these lower blood pressure, doses are adjusted continuously, often with a monitor or an arterial line.

A balloon pump is placed in a large artery through the groin and inflates and deflates in time with the heartbeat to reduce the heart’s workload. It is generally used when blood pressure stays dangerously low or organs are not getting enough blood despite medicines. It is meant to keep a person stable for hours or days until surgery. Patients on it usually have to lie fairly still in intensive care, and families should expect a lot of monitoring equipment.

Fixing the Valve With Surgery or a Catheter

Surgeons can sew in new chords made of a strong synthetic material.²⁸ Over time the body coats these new chords with its own tissue.²⁹ Repair with these chords has high success and lasts well.³⁰ In one surgeon series of 102 repairs, the leak was left at no more than a trace.³¹

The operation is done under general anaesthetic, and the heart is usually stopped temporarily while a heart-lung machine takes over circulation. The surgeon opens the heart, inspects the valve and measures the length of normal chords so the new ones are the right size. The new chords are stitched from the heart’s anchoring muscle to the edge of the loose flap, restoring the lost support. Surgeons often add a ring around the valve opening to help the valve close more fully. Before the chest is closed, a scan checks that the leak has stopped, and if it hasn’t, the surgeon can revise the repair at once.

Repair keeps your own valve, while replacement swaps it for a mechanical or tissue valve. Repair is usually preferred when possible.

Chord replacement can also be done through smaller cuts in minimally invasive surgery.³² This uses a cut between the ribs rather than splitting the breastbone, which may mean less pain and a quicker return to normal activity. Not every patient is suitable, since the choice depends on body build, other heart problems and the surgeon’s experience.

For people too sick for surgery, a clip fed through a leg vein (TEER) can pin the loose flap.³³ The catheter clip procedure is usually considered when surgical risk is high because of age, frailty or other illness. It is guided by a throat scan and usually leaves some leak, which can still be much reduced. Because the clip pins the flap rather than restoring the chord, the result can differ from surgery, and suitability depends on the shape of the valve. Catheter-based chord replacement devices are also emerging for high-risk patients,³⁴ and are generally offered at specialist centres or in trials.

Recovery and Long-Term Outlook

After repair of a ruptured chord, about 92% of people were alive at 5 years and 73% at 10 years.³⁵ After valve replacement, 5-year survival was 72%.³⁶ Blood clots that travel were about four times less common after repair.³⁷ These figures need careful reading: people who got replacements may have been sicker, so some of the difference may reflect who was chosen for each operation.

Most people stay in hospital several days and return to light activity within weeks. Cardiac rehab helps rebuild fitness safely, and follow-up scans check that the repair holds.

At home, most people are advised not to lift heavy objects or push or pull with the arms while the breastbone heals, usually for some weeks after open surgery. Driving is generally paused, and the surgical team can say when it is safe to restart. Tiredness is very common and can last weeks, so build activity gradually and rest when needed. Wound redness, discharge, fever or a new fast, irregular heartbeat in the early weeks should be reported promptly.

A long-standing leak gradually stretches the heart chambers,³⁸ so regular check scans matter even if you feel well. Tell dentists about your valve history in case antibiotics are advised.

When the Tricuspid Valve Is Affected

Chord rupture on the right-side valve is a rare result of blunt chest trauma.³⁹ The right side of the heart works at lower pressure, so a leak there is often better tolerated than one on the left. Symptoms such as tiredness, reduced exercise capacity and a vague sense of being unwell are easily put down to other causes, and the leak may not produce a murmur a doctor easily hears. Diagnosis can therefore take years.⁴⁰

A severe leak eventually leads to right heart failure, with leg swelling.⁴¹ Blood backs up in the veins of the body, causing swollen legs and ankles, and sometimes a swollen abdomen, loss of appetite and visible swelling of the neck veins. Unlike left-sided failure, the main problem is fluid in the body rather than severe breathlessness from flooded lungs. Early repair before heart failure gives a better outcome.⁴²

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