Is there long-term brain damage after bypass surgery?

"Brain scientists and cardiac surgeons at Johns Hopkins have evidence from 227 heart bypass surgery patients that long-term memory losses and cognitive problems they experience are due to the underlying coronary artery disease itself and not ill after-effects from having used a heart-lung machine. Researchers say their latest findings explain study results presented last year, which showed that the heart-lung machines - used to pump blood and supply the body with oxygen while the heart is stopped during surgery - did not cause postoperative long-term brain deficits" - Science Centric