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Comparison of perfusion up-slopes at stress and recovery, normalized for rest up-slope, on a per-patient basis. Four subjects in the aminophylline group and 3 subjects in the no-aminophylline group had greater perfusion at recovery than at stress. * P < 0.001; † P = 0.08; **P = 0.02; ‡ P = 0.01; ʃ P = 0.38
