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[Prognostic value of a new perfusion index calculated from coronarography]
Insights
A novel perfusion index accurately predicts survival in patients with coronary artery disease. This index, assessing coronary vascular bed perfusion, proved more significant than traditional prognostic factors.
Area of Science:
- Cardiology
- Vascular Medicine
- Prognostic Biomarkers
Background:
- Coronary artery disease (CAD) significantly impacts patient survival.
- Accurate prognostic assessment is crucial for managing CAD.
- Traditional prognostic factors in CAD include the number of stenotic vessels and ventricular kinetics.
Purpose of the Study:
- To introduce and validate a new perfusion index for evaluating prognosis in patients with CAD.
- To compare the prognostic value of the new perfusion index against conventional parameters.
Main Methods:
- A new perfusion index was developed based on 8 myocardial territories.
- Coronary arteriography data from 418 patients (1972-1973) were analyzed.
- Survival rates were evaluated in relation to the perfusion index and other prognostic factors.
Main Results:
- The perfusion index emerged as the most significant prognostic factor in CAD patients.
- Parameters like the number of stenotic vessels and ventricular kinetics lost prognostic value when adjusted for the perfusion index.
- An 8-year survival comparable to subjects without CAD was observed with <40% perfusion reduction.
- A 40-79% perfusion reduction correlated with a 30% 8-year death risk.
- An 80% perfusion reduction was associated with a 72% 8-year death risk.
Conclusions:
- The novel perfusion index offers a superior and easily determinable method for evaluating prognosis in coronary artery disease.
- This index provides a more accurate risk stratification than conventional parameters, aiding clinical decision-making.
Abstract:
A new perfusion index was determined from the study of the coronary vascular bed in 8 myocardial territories: upper septal, lower septal, upper anterior, lower anterior, apical, lateral, posterior and inferior. Stenosis of a vessel reduces perfusion in all territories fed by that vessel, downstream of the stenosis. The perfusion index is calculated by adding up the lesions in all 8 territories. In a population of 418 consecutive patients who had undergone coronary arteriography in 1972 and 1973, survival was evaluated according to the perfusion index and to those parameters which classically have the greatest influence on survival. The perfusion index came out as the most important prognostic factor since such parameters as the number of stenotic vessels and ventricular kinetics lose their prognostic value when adjusted to that index. According to the perfusion index, the 8-year prognosis is the same as in subjects without coronary disease when the reduction in overall perfusion does not exceed 40%. With a 40 to 79% reduction the death risk at 8 years is 30% whatever the exact percentage in each individual. When perfusion is reduced by 80% the death risk at 8 years rises to 72%. This perfusion index, easy to determine, provides a better evaluation of prognosis than the conventional parameters.