Influence of glucose-insulin-potassium (GIK) solution on heart rate (A), diastolic pressure (B), left ventricular developed pressure (LVDP; C), and rate-pressure product (RPP; D) during perfusion with control medium (C) or medium enriched with GIK solution (G). The number of experiments was 10 per group. S ef., substrate effect; T ef., effect of reperfusion duration; CI, cross-interaction between those 2 factors; NS, not significant.