Direct infarct artery stenting without predilation and no-reflow in patients with acute myocardial infarction

Background In patients with acute myocardial infarction (AMI), the rate of microvascular embolization and no-reflow promoted by coronary stenting with the use of conventional techniques (CS) appears to be greater than the one that occurs with balloon angioplasty. The minor invasiveness of direct ste nting (DS) of the infarct artery without predilation could be expected to r educe embolization in the coronary microvasculature and no-reflow in patien ts with AMI. Methods In a cohort of 423 consecutive patients with AMI who underwent infa rct-artery stenting, we compared CS and DS in terms of angiographic no-refl ow rate and 1-month clinical outcome. Results At baseline patients who underwent DS (n = 110) had a better risk p rofile compared with the use of CS (n = 313 ). The incidence of angiographi c no-reflow was 12% in the CS group and 5.5% in the DS group (P = .040). Th e 1 month mortality rate was 8% in the CS group and 12% in the DS group (P = .008). The mortality rate was 11% in patients with no-reflow and 5.6% in patients with a normal flow. Multivariate analysis showed that age, preproc edure patent infarct artery, and lesion length were related to the risk of no-reflow. In the subset of patients with a target lesion length less than or equal to 15 mm, the variables independently related to the risk of no-re flow were age, DS, and final balloon inflation pressure. Conclusions DS in patients with AMI may reduce the incidence of angiographi c no-reflow, thereby increasing ultimate effective myocardial reperfusion.