[Effect of thrombus aspiration during primary percutaneous coronary intervention in patients with ST-segment elevation myocardial infarction].

Objective: To investigate the effect of thrombus aspiration during primary percutaneous coronary intervention (PPCI) in patients with ST-segment elevation myocardial infarction (STEMI). Methods: This retrospective study included 321 STEMI patients who underwent PPCI at Beijing Chaoyang hospital from January 2013 to March 2014. Patients were divided into the PPCI group (189 cases) and the PPCI plus thrombus aspiration group (132 cases). Baseline and perioperative clinical data, procedural characteristics were collected, and primary endpoint events including all-cause death, re-myocardial infarction, and coronary revascularization and secondary endpoint events including cardiac death, recurrent angina, target lesion revascularization, and stent thrombosis were recorded during the follow-up. Results: There were no significant difference between PPCI group and PPCI plus aspiration group in age ((59.8±12.5) years old vs. (58.3±14.4) years old, P= 0.060) and male ratio (82.5% (156/189) vs. 82.6% (109/132), P= 0.993). The number of disease vessels (1.59±0.81 vs. 1.47±0.70, P= 0.039) and the prevalence of left anterior descending as infarction related artery (52.3% (69/132) vs. 38.6% (73/189), P= 0.022) were significantly higher in the PPCI plus aspiration group than that in the PPCI group.The symptom onset time (3.0 (2.0,4.8) hours vs. 4.0 (2.0,7.0) hours, P= 0.027) and myocardial ischemia time (3.9 (2.7,6.2) hours vs. 4.7 (2.9,7.9) hours, P= 0.022) were significantly in the PPCI plus aspiration group than in the PPCI group. The percent of thrombolysis in myocardial infarction (TIMI) thrombosis score≥ grade 4 (92.4% (122/132) vs. 75.1% (142/189), P< 0.001)and postoperative TIMI flow grade 3 (70.5% (93/132) vs. 60.8% (115/189), P= 0.003) was significantly higher in the PPCI plus aspiration group than in the PPCI group. The PPCI group patients were followed up for (31.6±7.5) months, and PPCI plus aspiration group patients were followed up for (32.2±6.7) months ( P= 0.466). During the follow-up period, there was no significant difference in the incidence of primary endpoint events between the PPCI plus aspiration group and the PPCI group (17.1% (22/129) vs. 16.9% (31/184), P= 0.962). Recurrent angina was more frequent in the PPCI plus aspiration group than in the PPCI group (25.6% (33/129) vs. 16.3% (30/184), P= 0.044). There was no significant difference in cardiac death (3.1% (4/129) vs. 3.3% (6/184), P= 1.000), target lesion revascularization (3.9% (5/129) vs. 3.3% (6/184), P= 0.765), and stent thrombosis (3.1% (4/129) vs. 2.7% (5/184), P= 1.000) between the PPCI plus aspiration group and the PPCI group. Multivariate Cox regression analysis showed that the number of diseased vessels ( RR= 1.901, 95 %CI 1.217-2.970, P= 0.005) and postoperative TIMI flow grade ( RR= 0.455, 95 %CI 0.221-0.934, P= 0.032) were the risk factors for coronary revascularization after PPCI. The number of diseased vessels was a risk factor for major endpoint events after PPCI ( RR= 1.421, 95 %CI 1.017-1.986, P= 0.040). Conclusion: The incidence of clinical events is similar in patients with STEMI treated with PPCI alone or PPCI plus aspiration.