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[Arrhythmia behavior and sudden heart death in isolated stenoses or obstructions of the anterior interventricular
Insights
Complete left anterior descending artery (LAD) occlusion increases sudden cardiac death risk and complex ventricular arrhythmias compared to LAD stenosis, despite similar wall motion abnormalities.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Imaging
Context:
- 144 patients with significant left anterior descending coronary artery (LAD) stenoses or occlusions were studied.
- Ventricular arrhythmias and left ventricular (LV) function were assessed using 24-hour ambulatory monitoring and LV-angiograms.
- Follow-up averaged 3.3 years, with a focus on sudden cardiac death and arrhythmia patterns.
Purpose:
- To investigate the relationship between LAD stenosis/occlusion, ventricular arrhythmias, and sudden cardiac death.
- To compare the incidence of arrhythmias and cardiac events in patients with LAD occlusion versus LAD stenosis.
- To correlate arrhythmia complexity with LV wall motion abnormalities and clinical outcomes.
Summary:
- Complete LAD occlusion was associated with a significantly higher incidence of sudden cardiac death (17.7%) compared to LAD stenosis (3.1%).
- Patients with LAD occlusion exhibited more complex ventricular arrhythmias (pairs/salvos) than those with LAD stenosis, despite similar myocardial infarction size and LV function.
- Lown class IV ventricular arrhythmias were more prevalent and linked to higher sudden cardiac death rates in LAD occlusion patients.
Impact:
- Complete LAD occlusion represents a higher risk for sudden cardiac death than LAD stenosis, independent of LV wall motion abnormalities.
- The findings highlight the importance of differentiating between LAD occlusion and stenosis for risk stratification.
- Understanding these differences can guide clinical management and preventative strategies for patients with coronary artery disease.
Abstract:
The incidence and pattern of ventricular arrhythmias recorded with 24 h ambulatory monitoring were studied in 144 patients with angiographically documented stenoses (greater than or equal to 75%) or occlusions of the left anterior descending coronary artery (LAD) and were related to left ventricular wall motion abnormalities. Ambulatory monitoring was performed at the time of coronary angiography and mean follow-up ranged from less than 1 to 5.4 with a mean of 3.3 years. The incidence of sudden cardiac death (within 1 h after onset of symptoms) was significantly higher in patients with LAD occlusion than in patients with LAD obstructions (14/79, 17.7% versus 2/65, 3.1%); (p less than 0.05). One hundred and twenty-two patients had anterior myocardial infarctions documented with ECG and LV-angiograms. The incidence and size of infarctions were comparable in patients with LAD stenoses and LAD occlusions. There was no difference in wall motion abnormalities, LV end-diastolic pressure (LVEDP) and ejection fraction in both groups. The majority of patients in both groups showed complex ventricular arrhythmias of Lown classification IV during Holter monitoring. The incidence of sudden cardiac death in patients with ventricular arrhythmias of Lown class IV was significantly higher in patients with LAD occlusions than in patients with LAD stenoses (9/40, 22.5% versus 1/31, 3.2%); (p less than 0.05). Quantitative evaluation of the arrhythmias showed that there was no difference between patients with LAD occlusions and LAD stenoses so far as single PVC's is concerned, yet complex ventricular arrhythmias (pairs and/or salvos) were found significantly more often in patients with LAD occlusions than with LAD stenoses (means 9.8 versus 6.3); (p less than 0.05). We conclude therefore that complete occlusion of the LAD is accompanied by more complex ventricular arrhythmias and bears a higher risk for sudden cardiac death than mere LAD stenoses although both groups of patients have the same left ventricular wall motion abnormalities.