Complications of Ventricular Aneurysm
Ventricular aneurysms following myocardial infarction lead to four major life-threatening complications: heart failure, ventricular arrhythmias, thromboembolism, and ventricular rupture. 1
Primary Complications
Heart Failure and Hemodynamic Compromise
- Congestive heart failure is the most common complication, occurring in 26.3% of patients with ventricular aneurysms versus 16.1% without 2
- The noncontractile, thin-walled fibrous outpouching reduces effective cardiac output and increases wall stress on remaining viable myocardium 3
- Cardiogenic shock develops in 10.0% of patients with ventricular aneurysms compared to 4.8% without 2
- Pump failure manifests as progressive left ventricular dysfunction requiring aggressive medical management with ACE inhibitors, diuretics, and digoxin 3
Ventricular Arrhythmias
- Ventricular tachyarrhythmias occur in 17.6% of patients with ventricular aneurysms versus 8.0% without 2
- The scar tissue at the aneurysm border creates reentry circuits predisposing to sustained ventricular tachycardia 1
- Cardiac arrest is more frequent (7.1% vs 5.0%) in the aneurysm cohort 2
- Surgery may be indicated for ventricular arrhythmias not amenable to drugs or radiofrequency ablation 1
- Pharmacotherapy choice should be guided by electrophysiologic studies 3
Thromboembolism
- Mural thrombus formation occurs due to stagnant blood flow within the dilated, low-velocity aneurysm chamber 4
- The combination of noncontractile wall and turbulent flow creates a powerful stimulus for platelet activation and chronic thrombus formation 4
- Systemic embolization can result in stroke or peripheral arterial occlusion 3, 5
- Anticoagulation with warfarin is recommended for at least 3 months after acute MI to prevent thromboembolism 3
- Surgery may be considered for recurrent thromboembolism despite appropriate anticoagulant therapy 1
Ventricular Rupture
- Free-wall rupture is characterized by recurrent chest pain, ST-T-wave changes, rapid hemodynamic collapse, electromechanial dissociation, and death 1
- Pseudoaneurysm formation with contained rupture and tamponade represents a surgical emergency with mortality rates approaching 60% 1
- Late rupture is a particular complication of false aneurysms where the pericardium forms the aneurysm wall 3
- Risk factors include first MI, anterior infarction, elderly patients, women, hypertension during acute STEMI, use of corticosteroids or NSAIDs, and delayed fibrinolytic therapy 1
Additional Clinical Sequelae
Mechanical Complications
- Mechanical complications (including ventricular septal rupture) occur in 2.6% of patients with ventricular aneurysms versus 0.2% without 2
- These require management in facilities with cardiac surgical expertise 6
Angina Pectoris
- Recurrent angina can occur due to increased myocardial oxygen demand from the dysfunctional ventricle 3
- Treatment utilizes conventional therapeutic modalities guided by coronary anatomy 3
Clinical Pitfalls
Critical distinction: True ventricular aneurysms must be differentiated from pseudoaneurysms (false aneurysms), which carry a significantly higher risk of rupture and require urgent surgical intervention 7. Pseudoaneurysms have a narrow neck and the wall consists only of pericardium, whereas true aneurysms have a wide neck and contain all three layers of the ventricular wall 7.
Resource Utilization Impact
Patients with ventricular aneurysms experience:
- Longer hospital length of stay
- Higher hospitalization costs
- Fewer discharges to home
- Comparable in-hospital mortality (7.4% vs 6.2%) but significantly higher morbidity 2
The incidence of ventricular aneurysms has declined to <5% with timely reperfusion therapy, occurring more frequently with anterior infarctions 1. Surgery is rarely needed but should be considered for refractory heart failure, intractable arrhythmias, or recurrent thromboembolism despite optimal medical therapy 1.