The effectiveness of successful TA on ST segment back to normal after PCI Characteristics ST segment back to normal OR (95% CI) p Yes (n%) No (n%) Successful TA 59 (86, 8) 9 (13, 2) 18, 57 (6, 12 - 64, 40) <0, 001 Unsuccessful TA 6 (26, 1) 17 (73, 9) 19 Table 3.16.