Efficacy of Ticagrelor vs Clopidogrel in High-risk NSTE-ACS Patients Undergoing Early PCI

Summary

The goal of acute coronary syndrome (ACS) therapy is to successfully restore both epicardial blood flow and myocardial perfusion. Percutaneous coronary intervention (PCI) has been documented as being the most effective method for restoration of epicardial blood flow. However, epicardial blood flow does not necessarily equate to myocardial perfusion. Clopidogrel binds irreversibly to platelet P 2 Y 12 receptors to inhibit platelet aggregation, with main limitations of slow onset, prevention of recovery of platelet functions, and interindividual variability. Clinical pharmacology and early dose-finding studies suggested a faster onset and greater and more consistent inhibition of platelet aggregation (IPA) with ticagrelor compared with clopidogrel. Two currently main methods of angiographic assessment of myocardial perfusion includes thrombolysis in myocardial infarction(TIMI) myocardial perfusion grading (TMPG) and myocardial blush grading (MBG). These established myocardial perfusion parameters have been widely used in various important trials and are reported to be highly useful in predicting clinical outcomes. However, visual assessment of these methods is categorical, subjective, and operator dependent of contrast in the myocardium using cine-angiographic frame-counting, was developed by the investigators' center to quantify myocardial tissue- level perfusion and was proved to be a predictive value on clinical prognosis. Thus, the investigators aim to initiate an open-label study evaluating the acute efficacy of treatment with ticagrelor versus clopidogrel on myocardial tissue-level perfusion assessed by Myocardial Perfusion Frame Count(TMPFC) and magnetic resonance imaging (MRI) in patients with high-risk non-ST elevation acute coronary syndrome (NSTE-ACS) undergoing early percutaneous coronary intervention (PCI) . The investigators hypothesize that compared with clopidogrel, ticagrelor can significantly improve myocardial perfusion assessed by Myocardial Perfusion Frame Count(TMPFC) in high-risk non-ST elevation acute coronary syndrome (NSTE-ACS) patients undergoing early percutaneous coronary intervention (PCI), without additional increased major bleeding.

Timeline

Start

2014-08

Primary completion

2016-08

Completion

2016-10

Publications

• Background Ding S, Pu J, Qiao ZQ, Shan P, Song W, Du Y, Shen JY, Jin SX, Sun Y, Shen L, Lim YL, He B. TIMI myocardial perfusion frame count: a new method to assess myocardial perfusion and its predictive value for short-term prognosis. Catheter Cardiovasc Interv. 2010 Apr 1;75(5):722-32. doi: 10.1002/ccd.22298.
• Background Gurbel PA, Bliden KP, Butler K, Tantry US, Gesheff T, Wei C, Teng R, Antonino MJ, Patil SB, Karunakaran A, Kereiakes DJ, Parris C, Purdy D, Wilson V, Ledley GS, Storey RF. Randomized double-blind assessment of the ONSET and OFFSET of the antiplatelet effects of ticagrelor versus clopidogrel in patients with stable coronary artery disease: the ONSET/OFFSET study. Circulation. 2009 Dec 22;120(25):2577-85. doi: 10.1161/CIRCULATIONAHA.109.912550. Epub 2009 Nov 18.
• Background Gibson CM, Cannon CP, Murphy SA, Ryan KA, Mesley R, Marble SJ, McCabe CH, Van De Werf F, Braunwald E. Relationship of TIMI myocardial perfusion grade to mortality after administration of thrombolytic drugs. Circulation. 2000 Jan 18;101(2):125-30. doi: 10.1161/01.cir.101.2.125.
• Background van 't Hof AW, Liem A, Suryapranata H, Hoorntje JC, de Boer MJ, Zijlstra F. Angiographic assessment of myocardial reperfusion in patients treated with primary angioplasty for acute myocardial infarction: myocardial blush grade. Zwolle Myocardial Infarction Study Group. Circulation. 1998 Jun 16;97(23):2302-6. doi: 10.1161/01.cir.97.23.2302.
• Background Chinese Society of Cardiology of Chinese Medical Association; Editorial Board of Chinese Journal of Cardiology. [Guideline of non-ST segment elevation acute coronary syndrome]. Zhonghua Xin Xue Guan Bing Za Zhi. 2012 May;40(5):353-67. No abstract available. Chinese.
• Background Kidambi A, Mather AN, Motwani M, Swoboda P, Uddin A, Greenwood JP, Plein S. The effect of microvascular obstruction and intramyocardial hemorrhage on contractile recovery in reperfused myocardial infarction: insights from cardiovascular magnetic resonance. J Cardiovasc Magn Reson. 2013 Jun 27;15(1):58. doi: 10.1186/1532-429X-15-58.
• Background Roe MT, Ohman EM, Maas AC, Christenson RH, Mahaffey KW, Granger CB, Harrington RA, Califf RM, Krucoff MW. Shifting the open-artery hypothesis downstream: the quest for optimal reperfusion. J Am Coll Cardiol. 2001 Jan;37(1):9-18. doi: 10.1016/s0735-1097(00)01101-3.
• Background Pu J, Shan P, Ding S, Qiao Z, Jiang L, Song W, Du Y, Shen J, Shen L, Jin S, He B. Gender differences in epicardial and tissue-level reperfusion in patients undergoing primary angioplasty for acute myocardial infarction. Atherosclerosis. 2011 Mar;215(1):203-8. doi: 10.1016/j.atherosclerosis.2010.11.019. Epub 2010 Nov 26.
• Background Pu J, Ding S, Shan P, Qiao Z, Song W, Du Y, Shen J, Jin S, He B. Comparison of epicardial and myocardial perfusions after primary coronary angioplasty for ST-elevation myocardial infarction in patients under and over 75 years of age. Aging Clin Exp Res. 2010 Aug;22(4):295-302. doi: 10.1007/BF03337726. Epub 2009 Dec 1.
• Background Mehran R, Rao SV, Bhatt DL, Gibson CM, Caixeta A, Eikelboom J, Kaul S, Wiviott SD, Menon V, Nikolsky E, Serebruany V, Valgimigli M, Vranckx P, Taggart D, Sabik JF, Cutlip DE, Krucoff MW, Ohman EM, Steg PG, White H. Standardized bleeding definitions for cardiovascular clinical trials: a consensus report from the Bleeding Academic Research Consortium. Circulation. 2011 Jun 14;123(23):2736-47. doi: 10.1161/CIRCULATIONAHA.110.009449. No abstract available.
• Background Shen LH, Wan F, Shen L, Ding S, Gong XR, Qiao ZQ, Du YP, Song W, Shen JY, Jin SX, Pu J, Yao TB, Jiang LS, Li WZ, Zhou GW, Liu SW, Han YL, He B. Pharmacoinvasive therapy for ST elevation myocardial infarction in China: a pilot study. J Thromb Thrombolysis. 2012 Jan;33(1):101-8. doi: 10.1007/s11239-011-0657-7.

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