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The natural history of single-vessel chronic coronary occlusion: a 25-year experience
J A Puma1, M H Sketch, J E Tcheng
1Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA.
Insights
Patients with single coronary artery occlusion after myocardial infarction face long-term risks. Early angiography (<30 days) increases mortality, particularly with proximal left anterior descending occlusion.
Area of Science:
- Cardiology
- Cardiovascular Disease
- Interventional Cardiology
Background:
- Single coronary artery occlusion is a significant finding in cardiovascular disease.
- Understanding the natural history of these occlusions is crucial for patient management.
- Myocardial infarction (MI) in the context of single vessel disease requires careful prognostic evaluation.
Purpose of the Study:
- To investigate the long-term natural history of patients diagnosed with total occlusion of a single coronary artery.
- To assess the impact of timing of coronary angiography post-myocardial infarction on patient outcomes.
- To evaluate the specific risks associated with proximal left anterior descending coronary occlusion.
Main Methods:
- Retrospective analysis of the Duke Databank for Cardiovascular Disease.
- Inclusion criteria: first coronary angiogram >2 days after symptomatic myocardial infarction (1969-1994).
- Stratification based on time from acute event to angiography and location of occlusion.
Main Results:
- Angiography >30 days post-MI showed low 1-year mortality (3%).
- Proximal left anterior descending occlusion had a 4% 1-year mortality risk.
- Angiography <30 days post-MI had higher mortality (5%), with proximal LAD occlusion at 10%.
- Time to angiography was a significant predictor of death (p=0.04).
Conclusions:
- While 1-year mortality is low, medically treated patients with isolated coronary vessel occlusion experience significant long-term risks.
- Delayed angiography (>30 days) is associated with better short-term survival post-MI.
- Proximal left anterior descending occlusion poses a higher risk, especially when diagnosed early after MI.
Abstract:
To determine the natural history of patients with a total occlusion of a single coronary artery, we searched the Duke Databank for Cardiovascular Disease to find all patients who underwent a first coronary angiogram >2 days after a symptomatic myocardial infarction between 1969 and 1994. Patients who underwent angiography >30 days after the acute event had a low risk of death in the first year (3%), and a proximal left anterior descending coronary occlusion did not confer substantially higher risk of death (4%). Patients undergoing angiography <30 days after the acute event had a higher mortality (5%), especially those with proximal left anterior descending occlusion (10%). The time from the acute event to angiography was a predictor of death (p = 0.04). Despite low 1-year mortality rates, patients with total occlusion of an isolated coronary vessel treated medically had substantial mortality, myocardial infarction, and revascularization rates over a long-term follow-up period.