RESULTS	Allopurinol 600 mg/d significantly increased forearm blood flow response to acetylcholine compared with both allopurinol 300 mg/d and placebo ( % change in forearm blood flow [ mean + / - SEM ] : 240.31 + / -38.19 % versus 152.10 + / -18.21 % versus 73.96 + / -10.29 % , P < 0.001 ) .\