Mitral Valve Prolapse

Overview

Mitral valve prolapse is a condition in which one or both leaflets of the mitral valve bulge back into the heart's left upper chamber when the left ventricle contracts. The mitral valve sits between the left upper and left lower chambers of the heart. Normally, when the mitral valve closes, its leaflets meet evenly and seal the opening. In mitral valve prolapse, one or both leaflets are slightly too large or too floppy and billow backward into the upper chamber with each heartbeat.

Mitral valve prolapse is one of the most common heart valve conditions, affecting approximately two percent of the general population. For the vast majority of people, it causes no symptoms and no serious problems throughout life. Many people discover they have it incidentally, when a routine examination or an echocardiogram done for another reason reveals the finding.

The outlook for most people with mitral valve prolapse is excellent and no treatment is needed. In some cases, however, the abnormal movement of the leaflets can cause blood to leak backward through the valve — a condition called mitral regurgitation. When this develops to a significant degree, closer monitoring and sometimes treatment become necessary.

Symptoms

The majority of people with mitral valve prolapse have no symptoms at all. When symptoms do occur, they are usually mild and are not life-threatening in most cases. Whether some symptoms are directly caused by the prolapse or reflect other factors is not always clear.

• Palpitations. This is one of the most commonly reported symptoms. The heart may feel as though it is skipping a beat, fluttering, or beating irregularly. In most cases this does not reflect a serious rhythm disturbance, but if palpitations are frequent or prolonged, they should be evaluated.
• Chest pain. A sharp or squeezing discomfort in the left side of the chest can occur. This type of chest pain is typically unrelated to exertion and passes quickly. It has a different character from the chest pain associated with coronary artery disease.
• Shortness of breath. Some people may notice mild breathlessness during physical activity. Significant breathlessness is not expected unless notable mitral regurgitation has developed.
• Fatigue. An unexplained and persistent sense of tiredness is sometimes reported. The direct relationship between this symptom and mitral valve prolapse is not always clear.
• Dizziness. Occasional mild lightheadedness or dizziness may occur.
• Anxiety. Palpitations and chest discomfort can heighten anxiety in some people. A somewhat higher prevalence of anxiety has been observed in people with mitral valve prolapse, though this relationship is not fully understood.

When to Seek Medical Care

People with a known diagnosis of mitral valve prolapse should see a doctor if any of the following develop.

• Palpitations that are frequent, prolonged, or getting worse over time
• Shortness of breath that returns or becomes more noticeable
• An unexplained decline in exercise capacity
• Swelling in the legs or ankles

Call emergency services immediately if any of the following occur.

• Sudden, severe chest pain
• Fainting or nearly fainting
• A very rapid or markedly irregular heartbeat
• Sudden, severe shortness of breath

Causes

Mitral valve prolapse is most often an inherited condition. The tissue that makes up the valve leaflets is somewhat more elastic than normal, allowing the leaflets to extend beyond their usual range of motion during contraction. This excess flexibility causes the characteristic billowing movement into the upper chamber.

• Inherited tendency. Mitral valve prolapse often runs in families. First-degree relatives of an affected person have a higher chance of also having the condition.
• Marfan syndrome. This inherited connective tissue disorder frequently involves the mitral valve and can be associated with a more significant form of prolapse.
• Ehlers-Danlos syndrome. Another connective tissue condition in which mitral valve prolapse may be seen.
• Slender body type. Mitral valve prolapse appears somewhat more commonly in people with a lean build, particularly young women. This association has been consistently observed, though not fully explained.

Risk Factors

• Family history. Having a first-degree relative with mitral valve prolapse increases the likelihood of the condition.
• Female sex. While mitral valve prolapse occurs in both sexes, it is reported somewhat more frequently in women.
• Connective tissue disorders. Conditions such as Marfan syndrome and Ehlers-Danlos syndrome are associated with a higher rate of mitral valve prolapse.

Diagnosis

Mitral valve prolapse is often discovered incidentally or during a routine examination. When a doctor listens to the heart with a stethoscope, a characteristic clicking sound may be heard during systole — the phase when the heart contracts. This click, which may be followed by a murmur if blood is leaking backward, is a distinctive and recognizable finding of mitral valve prolapse.

• Echocardiogram (heart ultrasound). This is the most important test for confirming the diagnosis and guiding follow-up. It directly shows whether and how much the leaflets are billowing back into the upper chamber. It measures whether blood is leaking backward through the valve and, if so, by how much. It also assesses the size and function of the left ventricle. The degree of prolapse and the amount of any associated regurgitation determine both the diagnosis and the monitoring plan.
• Electrocardiogram (ECG). Used to detect rhythm disturbances. Some people with mitral valve prolapse show minor T-wave changes or extra beats on the ECG. The ECG alone is not diagnostic but is important in patients who report palpitations.
• Holter monitor. A portable ECG device worn for 24 hours or longer that records the heart rhythm during normal daily activity. In patients with palpitations, it helps determine whether the symptoms coincide with a rhythm disturbance and, if so, what type.
• Exercise stress test. May be used to evaluate symptoms that occur during physical activity or to investigate whether exercise triggers any rhythm abnormalities.

Treatment

Most people with mitral valve prolapse need no treatment at all. Whether treatment is needed and what form it should take depends on whether blood is leaking backward through the valve and how significant the symptoms are.

Asymptomatic Patients

When there is no blood leak or only a trivial one, and symptoms are absent, no medication or intervention is required. The vast majority of people in this group can lead a completely normal life. Regular cardiology review and periodic echocardiography are all that is needed.

Managing Palpitations and Chest Discomfort

• Beta-blockers. In patients who experience troublesome palpitations or chest discomfort, beta-blockers can help by slowing the heart rate and reducing the frequency of extra beats. They are not used in all patients — only in those where there is a clear symptomatic benefit.
• Lifestyle adjustments. Reducing or eliminating caffeine, alcohol, and smoking can decrease palpitation frequency in some people.

Managing Rhythm Disturbances

The palpitations experienced by most people with mitral valve prolapse do not reflect a serious rhythm disturbance. However, when Holter monitoring identifies significant ventricular arrhythmias, antiarrhythmic medications or catheter ablation may be considered. This decision is made by a cardiologist based on an individualized risk assessment.

When Mitral Regurgitation Develops

When mitral valve prolapse progresses to produce significant blood leaking — mitral regurgitation — treatment becomes necessary. The approach is determined by the degree of regurgitation and the state of the left ventricle.

• Monitoring and medications. In moderate regurgitation, the left ventricle is monitored regularly with echocardiography. If heart failure symptoms develop, medications are started.
• Mitral valve repair. When significant regurgitation develops and enlargement or dysfunction of the left ventricle begins, surgery is recommended. Valve repair is the strongly preferred approach for prolapse-related mitral regurgitation and produces excellent long-term results. It avoids the need for lifelong anticoagulation and preserves the heart's natural mechanics. Minimally invasive repair techniques through small incisions are available at experienced centers.
• Mitral valve replacement. When repair is not feasible, replacement with a biological or mechanical valve is performed.
• MitraClip. In suitable patients who face a higher surgical risk, a catheter-delivered clip that draws the leaflets together can reduce the backward leak of blood without open surgery.

Complications

The great majority of people with mitral valve prolapse do not experience complications. In some cases, however, the following can develop.

• Mitral regurgitation. The most common complication. The abnormal movement of the leaflets can gradually lead to significant blood leaking backward through the valve. As regurgitation worsens, enlargement and eventual weakening of the left ventricle can follow.
• Rhythm disturbances. Atrial fibrillation and certain ventricular rhythm disturbances can develop. Atrial fibrillation both worsens symptoms and increases the risk of stroke.
• Infective endocarditis. The risk of bacterial infection settling on the valve surface is somewhat higher when significant regurgitation is present.
• Sudden cardiac arrest. This is very rare. The risk may be slightly elevated in people with severe mitral regurgitation and significant ventricular arrhythmias. In straightforward mitral valve prolapse without these features, the risk of sudden cardiac arrest is not meaningfully higher than in the general population.

Lifestyle

For the great majority of people with mitral valve prolapse, no significant restriction of daily activities is necessary. Being well informed about the condition — and understanding that it is benign in most cases — is itself one of the most important aspects of managing it.

Physical Activity

People with mitral valve prolapse who have no significant regurgitation and no serious rhythm disturbances can continue normal physical activity, including sport and exercise, without restriction. Activity limitations are not needed in this group. When significant regurgitation or rhythm disturbances are identified, your cardiologist will provide specific guidance on what is appropriate.

Caffeine, Alcohol, and Smoking

Caffeine, alcohol, and smoking can worsen palpitations in some people. Reducing or stopping these may help reduce symptom frequency. Stopping smoking also benefits overall heart and vascular health.

Anxiety and Stress Management

In some people, palpitations and chest discomfort associated with mitral valve prolapse can increase anxiety. Understanding the true nature of the condition — that it is benign in the vast majority of cases — is genuinely reassuring and can reduce unnecessary worry. When anxiety is a significant problem, stress management techniques or professional psychological support can be helpful.

Protecting Against Infective Endocarditis

Routine antibiotic prophylaxis before dental procedures is no longer recommended for straightforward mitral valve prolapse. Patients with significant mitral regurgitation or a prior episode of valve infection may be assessed differently. Discuss this specifically with your cardiologist, and always inform your dentist about your valve condition.

Regular Follow-up

Mitral valve prolapse requires ongoing cardiology monitoring. The frequency of follow-up depends on the degree of any associated regurgitation. When there is no leak or only a very trivial one, a review every few years is typically sufficient. When significant regurgitation develops, more frequent monitoring is needed. Contact your doctor or seek emergency care if any of the following develop.

• Palpitations that are frequent, prolonged, or worsening
• Shortness of breath that returns or becomes more noticeable
• Swelling in the legs or ankles
• Fainting or nearly fainting
• Fever with sweating and fatigue, which may suggest a valve infection

Preparing for Your Appointment

Coming prepared to an appointment for mitral valve prolapse helps your doctor make a more accurate assessment and choose the most appropriate approach for you.

What You Can Do

• Note any palpitations or chest discomfort — when they occur, how long they last, and what you were doing at the time.
• Share any family history of mitral valve prolapse or connective tissue disorders.
• Bring any previous echocardiography reports if you have them.
• List all medications and supplements you are taking.
• Describe your caffeine, alcohol, and smoking habits.
• Write your questions down before the appointment.

Questions You May Wish to Ask Your Doctor

• Is there any blood leaking backward through my valve and how significant is it?
• Do I need any medication or treatment?
• Can I exercise freely or are there any restrictions?
• Do I need to take antibiotics before dental treatment?
• Are my palpitations a sign of a serious rhythm disturbance?
• How often do I need follow-up appointments?

Questions Your Doctor May Ask You

• When did palpitations start and how often do they occur?
• Is chest pain related to exertion or does it occur independently?
• Is there a family history of mitral valve prolapse or connective tissue disease?
• Do you use caffeine, alcohol, or tobacco?
• Have you noticed any shortness of breath or a decline in your exercise capacity?
• What medications are you currently taking?