Ventricular Aneurysm
A ventricular aneurysm is a localized bulging or outpouching of the wall of one of the ventricles—the heart’s main pumping chambers. The left ventricle is most commonly affected, and most ventricular aneurysms develop after a heart attack as the damaged area thins and stretches under pressure. Less common causes include congenital anomalies, prior cardiac surgery, infections, certain cardiomyopathies, and trauma. Ventricular aneurysms can affect heart function, increase the risk of arrhythmias, and serve as a site for blood clot formation. Cardiac MRI and echocardiography are the central tools for evaluation.
What is it?
The ventricles are the two main pumping chambers of the heart. The left ventricle pumps oxygen-rich blood from the heart to the rest of the body, and the right ventricle pumps oxygen-poor blood to the lungs. A ventricular aneurysm is a localized bulging or outpouching of part of the ventricular wall, where the muscle has thinned, stretched, or been replaced by scar tissue. The left ventricle is most commonly affected. The aneurysm contains all layers of the heart wall and remains in continuity with the ventricular cavity, in contrast to a “pseudoaneurysm” (false aneurysm), which is a contained rupture in which the wall is incomplete and blood is held back only by surrounding tissue.
Most ventricular aneurysms develop as a long-term complication of a large heart attack (myocardial infarction). When a major coronary artery is blocked and a large region of heart muscle is permanently damaged, the affected area is replaced over weeks to months by scar tissue. Under the pressure generated each time the heart contracts, this scarred segment can gradually thin and bulge outward, producing a true aneurysm. The anterior wall and apex of the left ventricle are the most common locations after a heart attack involving the left anterior descending coronary artery. Less common causes include congenital ventricular aneurysms (often involving specific areas of the ventricle), prior cardiac surgery, infections (such as Chagas disease in endemic regions, where it is a recognized cause of apical aneurysms), inflammatory or autoimmune conditions, certain cardiomyopathies, and traumatic injury.
Pseudoaneurysms (false aneurysms) are far less common but more dangerous. They typically follow ventricular rupture after a heart attack, cardiac surgery, infection, or trauma, with the rupture contained by surrounding pericardium or scar tissue. Because the wall is incomplete and the risk of catastrophic rupture is higher, pseudoaneurysms generally require urgent surgical treatment, even when small or initially asymptomatic.
Symptoms vary widely. Many small or stable ventricular aneurysms cause no specific symptoms and are identified incidentally on cardiac imaging done for other reasons. Larger or complicated aneurysms can affect heart function and lead to shortness of breath, fatigue, reduced exercise tolerance, palpitations, chest discomfort, or signs of heart failure. Ventricular aneurysms are an important site for ventricular arrhythmias (such as ventricular tachycardia), which can cause palpitations, lightheadedness, fainting, or, in severe cases, sudden cardiac death. The bulging, non-contracting cavity within an aneurysm can also serve as a site where blood pools and clots form; these clots can break off and travel to other parts of the body, causing strokes or other embolic events. Pseudoaneurysms may present with persistent chest pain, signs of heart failure, or, if rupture occurs, catastrophic collapse.
Echocardiography is often the first imaging test that identifies a ventricular aneurysm and shows its size, location, contraction abnormalities, and any clot within. Cardiac MRI is particularly valuable because it provides detailed anatomical and functional information, including precise measurements of ventricular size and function, the presence and pattern of scar (using late gadolinium enhancement), and characterization of clots or other findings. Cardiac MRI is also highly accurate at distinguishing true aneurysms from pseudoaneurysms, which is critical for treatment decisions. Cardiac CT provides high-resolution anatomical information and may help in patients who cannot undergo MRI. ECG and ambulatory rhythm monitoring help identify arrhythmias. Cardiac catheterization is used in selected patients to assess coronary anatomy and ventricular function, particularly when revascularization or surgery is considered.
Important to Know
Management of a ventricular aneurysm is individualized and depends on the size and location of the aneurysm, the patient’s symptoms, the presence of complications such as heart failure, arrhythmias, or blood clots, and overall health.
For many true ventricular aneurysms—particularly smaller, stable post–heart attack aneurysms without significant complications—management focuses on optimizing overall cardiac care. This includes guideline-directed medical therapy for heart failure (often including beta-blockers, ACE inhibitors or ARBs or ARNI agents, mineralocorticoid receptor antagonists, SGLT2 inhibitors, and diuretics), management of coronary artery disease (with statins, antiplatelet therapy, and blood pressure and diabetes control), and treatment of associated arrhythmias.
When blood clots are present within an aneurysm—particularly within the left ventricular cavity—anticoagulation with warfarin or, in some cases, direct oral anticoagulants is generally recommended for a defined period to reduce the risk of stroke and other embolic events.
Patients with ventricular aneurysms are at increased risk of ventricular arrhythmias. Significant arrhythmias may require medications, catheter ablation, or implantable cardioverter-defibrillators (ICDs), particularly in patients with reduced ejection fraction or sustained ventricular arrhythmias. Heart failure–related arrhythmias and conduction abnormalities may also warrant cardiac resynchronization therapy in selected patients.
Surgical or catheter-based repair of a ventricular aneurysm may be considered in selected cases, particularly when the aneurysm is large, when heart failure is refractory to medical therapy, when significant ventricular arrhythmias are difficult to control, when large clots are recurrent, or when associated coronary or valve disease requires surgery. Pseudoaneurysms are generally treated surgically because of the high risk of rupture, even when small.
Care is typically coordinated by primary care clinicians, cardiologists, heart failure specialists, electrophysiologists, interventional cardiologists, and cardiothoracic surgeons. Imaging findings are interpreted alongside symptoms, examination, and other test results.
Long-term outcomes depend on the cause and complications of the aneurysm, as well as the management of underlying coronary or other cardiac conditions. Modern medical therapy, device treatment, and—in selected cases—surgical repair have improved outcomes for many patients.
Red flag symptoms include severe or worsening shortness of breath, severe chest pain, fainting, sustained rapid or irregular heart rate, signs of stroke or other embolic events (such as sudden weakness, numbness, vision changes, or limb pain), severe leg swelling, or signs of shock. These warrant urgent medical evaluation.