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Clinical and angiographic variables affecting the progression of coronary artery disease as determined by
1Department of Medicine, University of Louisville, KY.
Insights
Clinical risk factors do not predict coronary artery disease progression. Beta blocker use and absence of distal disease were linked to less disease progression in coronary segments, as shown by quantitative angiography.
Area of Science:
- Cardiology
- Vascular Biology
- Medical Imaging
Background:
- Coronary artery disease (CAD) progression is unpredictable, with controversial roles for clinical risk factors.
- Previous studies suggest hyperlipidemia intervention may reduce CAD progression.
- Limited research has explored angiographic features of individual lesions influencing disease advancement.
Purpose of the Study:
- To evaluate clinical and angiographic variables impacting coronary artery disease progression using serial quantitative angiography.
- To identify predictors of disease advancement in individual coronary segments.
Main Methods:
- Analysis of serial angiograms from 74 patients using computer-assisted quantitative angiography.
- Assessment of 99 diseased segments for progression, defined as a ≥20% absolute reduction in luminal cross-sectional area.
- Calculation of correlation coefficients and odds ratios for clinical and angiographic variables.
Main Results:
- Clinical risk factors (diabetes, hypertension, high cholesterol, smoking, family history) did not predict CAD progression.
- Beta blocker use was associated with a threefold decreased likelihood of progression (odds ratio 0.33).
- Presence of distal disease correlated with proximal lesion progression (odds ratio 2.4); other lesion characteristics did not influence progression.
Conclusions:
- Clinical risk factors are not predictive of individual coronary segment disease progression via quantitative angiography.
- Beta blocker use and absence of coexistent distal disease are associated with reduced progression in coronary segments.
- Potential mechanisms include altered wall stress, reduced platelet interaction, and improved endothelial function.
Abstract:
To assess by serial quantitative angiography, the significance of clinical and angiographic variables that affect the progression of coronary artery disease (CAD). Progression of disease by sequential angiography is unpredictable and the role of clinical risk factors controversial. Various intervention trials have demonstrated less progression and even regression in hyperlipidemic patients. Correlates of progression have included a younger age, unstable angina, and greater involvement of the coronary arteries, with few studies looking at angiographic features of individual lesions. Serial angiograms on 74 patients were analyzed by computer assisted quantitative angiography using absolute measurements. A total of 99 diseased segments were analyzed for progression defined as an absolute reduction of 20% in luminal cross-sectional area. A preliminary correlation coefficient was calculated for each of the clinical and angiographic variables to detect any association with progression, and the odds ratio determined. The presence of any of the clinical risk factors-diabetes, hypertension, serum cholesterol, smoking, and a family history of coronary disease could not predict progression. The use of beta blockers was three times less likely to be associated with progression (odds ratio 0.33). While the presence of distal disease was associated with progression of a more proximal lesion (odds ratio 2.4), eccentricity, branch point location, lesion length, calcification, thrombus, or the presence of collaterals did not influence progression of disease in an individual segment. In conclusion, the presence of any of the clinical risk factors could not predict progression of disease in an individual coronary segment as determined by serial quantitative angiography, and the use of beta blockers and the absence of coexistent distal disease was associated with less progression of disease in an individual coronary segment. This may be related to changes in wall stress, reduced platelet interactions, and the integrity and permeability of the vascular endothelium to lipids.