Coronary artery bypass grafting (CABG) remains the gold standard treatment in patients with complex multivessel coronary artery disease (CAD). Reversed long saphenous vein is the most commonly used conduit despite the known early thrombotic failure and low long-term patency rate. Post-operative antiplatelet therapy is an established treatment to improve graft patency and also a secondary treatment of the underlying native CAD.Aspirin has traditionally been the first line therapy; however, aspirin resistance especially in the early period after CABG, has been reported over the years and as a result, the use of dual antiplatelet therapy (DAPT) has become more common. However, there is limited evidence about the effect of DAPT and duration of use after CABG on graft patency, clinical outcomes (such as bleeding and myocardial infarction), and survival. The optimal dose of aspirin when given in DAPT is unclear and the duration of DAPT in association with quality of life is unknown.Furthermore, a better understanding of the pathology of vein graft disease and how available drugs influence it, could lead to the development of customised therapy for cohorts of patients undergoing CABG with potential benefits to early and long term outcomes. Here we review the available evidence on the routine use of DAPT after CABG.
Coronary artery bypass grafting (CABG)Ischaemic heart disease (IHD) is the main leading cause of death in the world, with 7.4 million deaths in 2012 [1,2]. Coronary artery bypass grafting (CABG) is the gold standard intervention in patients with complex multivessel disease [3]. In the UK, there are about 25,000 CABG operations performed annually [4] and the majority of these operations is carried out on patients over 70 years of age [5]. Demand for CABG is likely to increase considerably in the future as a result of rapidly ageing populations [6] and increased expectations of patients and surgeons to expand their indications for surgery.During the early years of coronary surgery, saphenous vein grafts (SVGs) were the only conduits used [7]. Over the years different arterial conduits were introduced with variable degree of success [8][9][10]. Contemporary data on international use of grafts are available from the SYNTAX trial that included 1541 patients who underwent CABG at 85 sites in 18 countries between 2005 and 2007 [11]. The SYNTAX trial confirmed that the long saphenous vein (LSV) graft, is the most used conduit for multivessel revascularisation, despite its known low early and late patency rates.The underlying mechanism behind vein graft disease is multifactorial and can include conduit trauma/graft thrombosis (within 1 month, early failure), activation of intimal hyperplasia associated with harvest and implantation into the arterial high-pressure system (1 to 12 months, intermediate failure), superimposed atherosclerosis (beyond 12 months, late failure) [12][13][14][15]. A prospective cohort study of 1,388 patients carried out between 1969 to 1994, in which patency was assessed using coronary...