Coronary collateral circulation in acute, subacute, and chronic total occlusions

Abstract

Context: A study on the pattern of coronary collateral circulation is relevant in coronary artery disease (CAD) where despite advances in revascularization, the prevalence of heart failure is increasing. Aims: The aim was to study the pattern of coronary collateral circulation in acute, subacute, and chronic coronary total occlusions and to find out the association between collateral grade with the severity of CAD. Settings and Design: This was a hospital-based retrospective cross-sectional study of 141 patients with acute, subacute, or chronic total occlusion of coronaries detected by coronary angiography. Subjects and Methods: Data of 141 patients with total occlusion of coronaries detected by coronary angiography were analyzed. Collateral grading was done according to the Rentrop classification and Werner classification. The severity of CAD was assessed using Gensini score and Syntax score. Pattern of collateral circulation in different types of coronary occlusions and the association between collateral grade and severity of CAD were assessed. Statistical Analysis Used: The association of categorical clinical and angiographic features with type of occlusion was tested using Chi-square test and that of continuous variable with student t-test. All tests were two tailed and P