Conclusions
This study demonstrated that patients with a left dominant system have worse outcome after STEMI, with a two-fold increased risk of 30-day mortality and an increased risk of reinfarction during the first month post-STEMI. In patients surviving the first 30 days post-STEMI, coronary vessel dominance had no influence on long-term outcome. Awareness of the prognostic relevance of coronary dominance is important, recognizing a left dominant system as one of the risk factors for future adverse events post-STEMI.