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).