Original Article Comparison of Anticoagulant and Antiplatelet
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Int J Clin Exp Med 2017;10(11):15359-15367 www.ijcem.com /ISSN:1940-5901/IJCEM0057429 Original Article Comparison of anticoagulant and antiplatelet therapy in patients with ST-segment elevation myocardial infarction undergoing primary percutaneous coronary intervention (PCI) Qianhui Li, Yin Xiang, Yong Tang, Yachen Zhang Department of Cardiology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China Received December 8, 2016; Accepted October 5, 2017; Epub November 15, 2017; Published November 30, 2017 Abstract: Objective: The aim of this study was to investigate the safety and efficacy of bivalirudin plus ticagrelor com- pared with heparin plus clopidogrel in patients with ST-segment elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention (PCI). Methods: 630 patients with ST-segment elevation myocardial infarction undergoing PCI were divided into a bivalirudin plus ticagrelor group and a heparin plus clopidogrel group. Patients assigned to ticagrelor were given a loading dose of 180 mg orally before PCI, followed by a maintenance dose of 90 mg twice a day. Clopidogrel was initiated with a loading dose of 600 mg and carried on with a mainte- nance dose of at least 75 mg every day. Bivalirudin or heparin was given to patients during the PCI. Results: At the end of 12-month follow-up, net adverse clinical events were observed in 32 patients (10.4%) of 308 given bivali- rudin plus ticagrelor and 58 patients (18.4%) of 315 given heparin plus clopidogrel [relative risk (RR), 0.564; 95% confidence interval (CI), 0.377-0.843; P=0.004]. The composite ischemic endpoint of death, re-infarction, target vessel revascularization, or stroke did not significantly differ between the two groups (RR, 0.670; 95% CI, 0.384- 1.169; P=0.155). The rate of 12-month bleeding in the bivalirudin plus ticagrelor group was lower than that in the heparin plus clopidogrel group (4.2% versus 9.2%, P=0.013; RR=0.458; 95% CI, 0.243-0.865). In addition, bivali- rudin combined with ticagrelor did not raise the incidence of 12-month stent thrombosis in the present study (0.6% vs 1.3% respectively, P=0.686). Conclusions: Among patients with STEMI undergoing primary PCI, bivalirudin plus ticagrelor reduced net adverse clinical events compared with heparin plus clopidogrel. This observation was mainly attributed to a decrease in bleeding events in the bivalirudin plus ticagrelor group, without statistical differences in major adverse cardiac or cerebral events or stent thrombosis compared with the heparin plus clopidogrel group. Keywords: Bivalirudin, ticagrelor, heparin, clopidogrel, percutaneous coronary intervention (PCI) Introduction tion myocardial infarction (STEMI) patients ad- mitted to a hospital in time [1, 3]. Adjunctive Coronary artery heart diseases, especially antithrombotic and antiplatelet agents are re- acute myocardial infarction, are the most com- quired to sustain patency of the infarct-related mon cause of death worldwide. More than 700 artery during and after PCI. It is necessary to million people die from coronary artery disease find a balance between safety and efficacy. each year, accounting for 12.8% among all- cause mortality. In Europe, one out of every six In a previous study, bivalirudin and ticagrelor men and one out of every seven women die respectively showed considerable benefits [4, of myocardial infarction [1]. Coronary artery 5]. In the Harmonizing Outcomes with Reva- plaque fissures cause platelet aggregation, scularization and Stents in Acute Myocardial adhesion, and thrombosis, giving rise to partial Infarction (HORIZONS-AMI) trial, STEMI patients or overall obstructive coronary arteries, which undergoing primary PCI showed reduced net is the pathophysiological basis of acute myo- clinical outcomes after pretreatment with clopi- cardial infarction [2]. Primary percutaneous dogrel and the direct thrombin inhibitor bivaliru- coronary intervention (PCI) is the main treat- din compared with heparin plus glycoprotein ment strategy among acute ST-segment eleva- (GP) IIb/IIIa inhibitors [6]. This result was attrib- Anticoagulant and antiplatelet therapy in patients with STEMI uted to a lower rate of major bleeding. Ne- months; surgical operation within 1 month; ao- vertheless, there was a high incidence of acute rtic dissection; infectious endocarditis; blood (<24 h) stent thrombosis after PCI with bivaliru- pressure >180/110 mmHg; known hemoglobin din [6]. Ticagrelor is an oral P2Y12 anti-platelet <100 g/L; thrombocytopenia; severe liver or drug that can provide a fast and invertible an- kidney dysfunction; history of bronchial asth- ti-platelet aggregation effect [7-10]. Ticagrelor ma; CABG; allergies or prohibitions to the study was once compared with clopidogrel in the drugs; patient unwilling or unable to submit Platelet Inhibition and Patient Outcomes (PL- informed consent. ATO) trial [11], which was a large-scale, pro- spective, randomized trial. Regardless of tre- Randomization and treatment atment strategy with or without ST-segment elevation, PLATO showed that ticagrelor had a Patients were randomly assigned 1:1 to receive lower rate of death, myocardial infarction, and bivalirudin plus ticagrelor or heparin plus clo- stroke than clopidogrel. In patients with STE- pidogrel after admission. Bivalirudin (Salubris ACS undergoing PCI, ticagrelor did not increa- Pharmaceuticals Co) was initiated as an intra- se incidence of major bleeding but reduced venous bolus of 0.75 mg/kg followed by infu- several secondary end points, including defi- sion of 1.75 mg/kg/h during the PCI procedure nite stent thrombosis [5]. Prasugrel plus biva- and for at least 30 minutes after PCI until he- lirudin is superior to a strategy based on clo- parin administration. Patients receiving tica- pidogrel plus heparin in terms of net clinical grlor (AstraZeneca Pharmaceuticals) were gi- outcome in STEMI patients with planned pri- ven a loading dose of 180 mg orally, followed mary PCI [12]. Whether a combination of bi- by a maintenance dose of 90 mg twice a day. valirudin and ticagrelor may have synergistic The heparin was granted a bolus dose of 100 effects with respect to ischemic and bleeding U/kg per current guidelines [1, 13, 14]. Sub- complications remains unclear. The study ai- sequent heparin was accorded with the target med at assessing the safety and efficacy of activated clotting time of 250-300 s. Clopido- bivalirudin plus ticagrelor versus clopidogrel grel (Sanofi Pharmacy) was initiated with a plus heparin for ST-segment elevation myocar- loading dose of 600 mg and carried on with a dial infarction patients during and after PCI. maintenance dose of at least 75 mg every day. If clopidogrel had already been taken prior to Materials and methods the study, an additional loading dose was gi- ven to reach a goal loading dose of 600 mg. Ethics statement On condition that the no-reflow phenomenon or other thrombotic complications occurs, tem- The study procedures were reviewed and ap- porary emergency use of tirofiban was allowed. proved by the medical ethics committee of Xinhua Hospital, Shanghai Jiaotong University All patients who had not been taking long-term School of Medicine. All patients signed inform- aspirin received an oral loading dose of 300 mg ed consent forms before randomization. aspirin prior to the randomization followed by a maintenance dose of 100 mg once daily. Study population End points and definitions All 630 patients with ST-segment elevation MI (STEMI) were recruited at Xinhua Hospital, To gain comprehensive information concerning Shanghai Jiaotong University School of Me- compliance and any occurrence of adverse dicine between October 2015 and February events, patients were followed up by special 2016. Patients were eligible for enrollment if clinic reexamination, telephones, and e-mail they were aged 18 to 80 years with STEMI with- for 12 months after randomization or until de- in 12 hours from symptom onset, or within 12 ath occurred before 12 months. Seven patients to 24 hours presented with lasting chest pain dropped out during the study period in bivaliru- or new left bundle-branch block. The major din plus ticagrelor group. exclusion criteria were as follows: cardiogenic shock; thrombolytic and anticoagulant admi- The primary end point was a composite of net nistered within 48 hours; history of major blee- adverse clinical events (NACE), including major ding or hemorrhagic tendency in the past three adverse cardiac or cerebral events (MACCE) 15360 Int J Clin Exp Med 2017;10(11):15359-15367 Anticoagulant and antiplatelet therapy in patients with STEMI defined by the Bleeding Aca- demic Research Consortium (BARC) [15]. Secondary end points were major adverse cardiac or ce- rebral events and any bleed- ing at 12 months. In the BA- RC study, types 2-5 were con- sidered to require clinical inter- vention. BARC types 3-5 were regarded as major clinical ble- eding events. At 12 months, extra safety end points includ- ed stent thrombosis per Aca- demic Research Consortium criteria [16]. Statistical analysis Statistical analyses were two- sided test (P<0.05) and per- formed with SPSS version 19.0. Continuous data were conveyed as the mean ± stan- Figure 1. Patient dard deviation, and categori- disposition in the trial. cal variables were summariz- ed using frequencies and per- centages. Basic clinical char- acteristics were compared be- Table 1. Baseline characteristics of the two groupsa tween two groups using the student’s t-test, the chi-square Bivalirudin Heparin + test, or the Fisher exact test. Characteristics + ticagrelor clopidogrel P (n=308) (n=315) The clinical endpoint events were assessed by means of Age, mean ± SD, y 66.39±10.35 67.76±10.21 0.098 the chi-square test or Fisher Men, No. (%) 219 (71.3) 233 (74.0) 0.461 exact test. The main analysis Body mass index, mean ± SD 24.37±0.58 24.45±0.56 0.089 was performed to evaluate dif- Medical history, No. (%) ference in the light of primary Diabetes 103 (33.4) 127 (40.3) 0.081 endpoint at 12 months.