Objectives: We aimed to assess the safety and feasibility of thrombectomy with the Export Aspiration Catheter (EAC) before angioplasty, and its ability to improve angiographic results in patients with ST-segment elevation myocardial infarction (STEMI).
Background: Distal embolization of atherothrombotic material often occurs during angioplasty in STEMI, compromising optimal myocardial reperfusion.
Methods: We performed a thrombus-aspiration with EAC prior to angioplasty in 64 consecutive patients with STEMI. Successful thrombectomy was defined as an improvement of TIMI flow grade > or =1.
Results: Successful thrombectomy (increase of TIMI flow > or =1) was achieved in 40 patients (62.5%). Mean TIMI flow grade increased from 0.7 +/- 1 to 1.9 +/- 1.2 (P < 0.0001) after thrombectomy. TIMI flow grade 3 was observed more frequently after EAC compared with guidewire alone (51.5 vs. 9%, P = 0.0062). Direct stenting was performed in most of patients (N=41, 64%). Distal embolization and noreflow/slowflow phenomenon occurred in 8 patients (12.5%). No vessel injury after EAC thrombectomy was reported. After treatment with balloon angioplasty and/or stenting, final TIMI flow grade 3 was achieved in 54 patients (84.5%). By multivariate analysis, ischemic time <6 h was a significant independent predictor of successful thrombectomy (P = 0.0437).
Conclusions: Our series suggests that EAC thrombectomy prior to angioplasty in the setting of STEMI is safe and feasible. It might reduce the culprit coronary lesion's thrombus burden, leading to improved flow restoration and myocardial reperfusion. Further large randomized studies are warranted to confirm these preliminary results and to assess the impact of thrombus-aspiration on infarct size as well as on clinical outcomes.