 Advocates say the approach enables surgeons to retrieve more usable livers, kidneys, and hearts. But critics say restarting circulation essentially reverses the very conditions upon which the donor has just been declared dead. The surgeon also cuts off blood to the brain, which critics say raises more troubling questions. Rob Stein, NPR News. The Nasdaq has closed up 50 points. S&P was up 5. Dow was down 31. It's NPR.