RESULTS	Perfusion in the region with maximal reduction during PTRA in groups B and A was 76 + / - 15 % and 76 + / - 15 % at baseline , decreased to 56 + / - 16 % ( p < 0.001 ) and 67 + / - 14 % , respectively , during PTRA ( p < 0.01 A vs. B ) , and returned to 76 + / - 15 % and 80 + / - 13 % , respectively , after PTRA .\