Acute myocardial infarction and stroke
Eight out of 11 comparative studies reported rates of myocardial infarction (MI) postoperatively. None of the studies found a difference in rates between the Witness and non-Witness groups, with results ranging from 0 to 6.3% and 0 to 4.2%, respectively2,15,44,47-51. The rates of MI in studies that included Witnesses only were similar, 08 and 3%57.
Eight of the comparative studies also reported rates of postoperative stroke. Again, none of the studies found a difference between the two groups, with frequency ranging from 0 to 5.1% for both groups2,15,44,47-51. Non-comparative studies found low rates of stroke also (04, 1.1%52and 3%57).