Platelet function tests predict bleeding and thrombotic events after off- pump coronary bypass grafting. Eur J Cardiothorac Surg. 2005;27:584 591. doi: 10.1016/j.ejcts.2004.12.061. 59. Bednar F, Osmancik P, Vanek T, Mocikova H, Jares M, Straka Z, Widimsky P. Platelet activity and aspirin efficacy after off-pump compared with on-pump coronary artery bypass surgery: results from the prospective randomized trial PRAGUE 11-Coronary Artery Bypass and REactivity of Thrombocytes (CABARET). J Thorac Cardiovasc Surg. 2008;136:1054 1060. doi: 10.1016/j.jtcvs.2008.03.052. 60. Wang Z, Gao F, Men J, Ren J, Modi P, Wei M. Aspirin resistance in off-pump coronary artery bypass grafting. Eur J Cardiothorac Surg. 2012;41:108 112. doi: 10.1016/j.ejcts.2011.04.021. 61. Gundry SR, Romano MA, Shattuck OH, Razzouk AJ, Bailey LL. Seven-year follow-up of coronary artery bypasses performed with and without cardiopulmonary bypass. J Thorac Cardiovasc Surg. 1998;115: 1273 1277. 62. Puskas JD, Williams WH, Mahoney EM, Huber PR, Block PC, Duke PG, Staples JR, Glas KE, Marshall JJ, Leimbach ME, McCall SA, Petersen RJ, Bailey DE, Weintraub WS, Guyton RA. Off-pump vs conventional coronary artery bypass grafting: early and 1-year graft patency, cost, and quality-of-life outcomes: a randomized trial. JAMA. 2004;291:1841 1849. doi: 10.1001/jama.291.15.1841. Kulik et al Secondary Prevention After CABG 953 63. Ibrahim K, Tjomsland O, Halvorsen D, Wiseth R, Wahba A, Karevold A, Haaverstad R. Effect of clopidogrel on midterm graft patency fol- lowing off-pump coronary revascularization surgery. Heart Surg Forum. 2006;9:E581 E856. doi: 10.1532/HSF98.20061034. 64. Gurbuz AT, Zia AA, Vuran AC, Cui H, Aytac A. Postoperative clopidogrel improves mid-term outcome after off-pump coronary artery bypass graft surgery: a prospective study. Eur J Cardiothorac Surg. 2006;29:190 195. doi: 10.1016/j.ejcts.2005.11.033. 65. Nielsen AB, Bochsen L, Steinbr chel DA. Hypercoagulability and platelet inhibition after OPCAB: randomized intervention with clopidogrel. Scand Cardiovasc J. 2007;41:325 330. doi: 10.1080/14017430701383763. 66. 