The 2,600-patient Sort Out IV study, designed to examine whether the Xience V is "non-inferior" to the Cypher, showed that the rate of major adverse cardiac events was comparable for each stent. The Abbott device produced a MACE rate of 4.9 percent, versus a rate of 5.2 percent for the Cordis stent. The incidence of cardiac death was 1.9 percent for the Xience V and 1.4 percent for the Cypher and rates of myocardial infarction (heart attack) were also on par, at 1.1 percent for the Xience V and 1.4 percent for the Cypher. Rates of stent thrombosis were a dead heat at 0.9 percent for each stent.