Table 2 High-energy phosphates, hypoxanthine and xanthine myocardial content at T2 (end of the 60-minute intravenous infusion)

Phosphocreatine

14.30 ± 7.92

6.78 ± 6.04

11.57 ± 0.76

ATP

18.65 ± 5.63

15.80 ± 2.11

25.25 ± 1.91*

ADP

8.74 ± 1.47

10.92 ± 2.12

9.63 ± 0.85

AMP

3.26 ± 1.92

6.26 ± 1.52^§

2.64 ± 0.42°

Hypoxanthine

0.42 ± 0.07

0.33 ± 0.15

0.48 ± 0.03

Xanthine

0.43 ± 0.09

0.56 ± 0.19

0.38 ± 0.00