yperemic MPG was significantly correlated with PSVR (*R*=0.00; *P*\<0.00, [Figure 0](#f0-mder-0-000){ref-type="fig"}).  MPR decreased significantly after injection of ISDN (from 0.00±0.00 to 0.00±0.00; *P*\<0.00, [Figure 0](#f0-mder-0-000){ref-type="fig"}). Baseline MP