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Does visual interpretation of the coronary arteriogram predict the physiologic importance of a coronary stenosis?
Insights
Visual interpretation of coronary arteriograms poorly predicts coronary flow issues. Coronary angiography often misjudges stenosis severity, highlighting the need for better methods to assess coronary artery disease.
Area of Science:
- Cardiovascular medicine
- Interventional cardiology
- Diagnostic imaging
Background:
- Coronary arteriography is a standard tool for assessing coronary artery disease.
- Visual interpretation of coronary angiograms is used to estimate the severity of coronary obstructions.
- The physiologic significance of coronary obstructions is crucial for patient management.
Purpose of the Study:
- To evaluate the accuracy of visual interpretation of coronary arteriograms in predicting the physiologic effects of coronary obstructions.
- To compare angiographic measurements of coronary stenosis with Doppler-derived measurements of coronary flow velocity.
Main Methods:
- Coronary arteriograms were analyzed for percentage of stenosis in 44 vessels from 39 patients.
- Reactive hyperemia was measured using Doppler flow velocity after 20 seconds of coronary arterial occlusion.
- Correlation between visual stenosis assessment and hyperemic response was analyzed.
Main Results:
- Visual estimation of coronary stenosis from arteriograms showed no significant correlation (r = -0.25) with the reactive hyperemic response.
- Arteriography frequently underestimated severe stenosis (>60%) and showed variable accuracy for milder lesions (<60%).
- High interobserver and intraobserver variability in angiogram interpretation was noted.
Conclusions:
- Conventional visual analysis of coronary angiograms is unreliable for assessing the physiologic impact of coronary obstructions.
- Physiologic assessment of coronary lesions requires methods beyond standard angiographic interpretation.
- Improved analytical techniques are needed for accurate evaluation of coronary artery disease severity.
Abstract:
To assess visual interpretation of the coronary arteriogram as a means of predicting the physiologic effects of coronary obstructions in human beings, we compared caliper measurements of the degree of coronary stenosis with the reactive hyperemic response of coronary flow velocity studied with a Doppler technique at operation, after 20 seconds of coronary arterial occlusion. In 39 patients (44 vessels) with isolated, discrete coronary lesions varying in severity from 10 to 95 per cent stenosis, measurement of the percentage of stenosis from coronary angiograms was not significantly correlated (r = -0.25) with the reactive hyperemic response. Results were the same for obstructions in the left anterior descending, diagonal, and right coronary arteries. Underestimation of lesion severity occurred in 95 per cent of vessels with greater than 60 per cent stenosis of the diameter by arteriography. Both overestimation and underestimation of lesions with less than 60 per cent stenosis were common. These results, together with the high interobserver and intraobserver variability of standard visual analysis of angiograms, suggest that the physiologic effects of the majority of coronary obstructions cannot be determined accurately by conventional angiographic approaches. The need for improved analytical methods for the physiologic assessment of angiographically detected coronary obstructions is apparent.