The study, which examines deals in America in 1962-2001, makes various adjustments to take account of the flaws and concludes that mergers created, on average, combined gains to shareholders of 7.3%, comparedwiththe gains identified by the old method of 5.3%.
One trial of 113 patients showed 58% had good brain function after three months, comparedwith 33% of those treated withthe coil method, as well as a lower death rate.
Patients who had the new method had a higher rate of strokes or near strokes at 1 year, amounting to an additional event for every 25 patients undergoing the new methodcomparedwith surgery.