Effect of Coronary Artery Dominance In-terms of Presentation and In-hospital Outcomes of patients undergoing Primary PCI for Culprit Proximal Left Anterior Descending Artery

Objectives: Objective of this study was to assess the difference in terms of presentation and in-hospital course between patients with right vs. left dominant arterial circulation undergoing “primary percutaneous coronary intervention (PCI)” for culprit proximal left anterior descending artery (LAD). Methodology: We included consecutive adult (≥18 years) patients diagnosed with STE-ACS undergoing primary PCI for culprit proximal LAD. Patients were categorized into right vs. left dominant circulation on left heart catheterization. Demographic, clinical characteristics, presentation, and hospital course were compared between the matched (propensity matched) and unmatched cohort of patients with right vs. left dominance. Results: We included 775 patients, out of which 81.3% (630) were males and mean age was 54.59 ± 11.3 years. On coronary angiogram left dominance was observed in 14.3% (111). Single vessel disease was higher with left compared to right dominant system, 53.2% vs. 43.5%, respectively. The rate of slow flow/no-reflow (15.4% vs. 7.2%; p=0.0.230), heart failure (9.3% vs. 6.3%; p=0.299), and in-hospital mortality (5.1% vs. 3.6%, p=0.493) were not different between right vs. left dominance, respectively. In the matched cohorts, the frequency of slow flow/no-reflow (15.3% vs. 7.2%; p=0.056), heart failure (6.3% vs. 6.3%; p>0.999), and mortality (5.4% vs. 3.6%, p=0.493) were not different between right vs. left dominance, respectively. Conclusion: No significant increase in complications and outcomes is witnessed among patients with left dominant arterial circulation undergoing primary PCI for culprit proximal LAD. However, careful handling of left main during intervention is warranted due lack of support from right system.