Figure 2.

Calculation of “abc” Measurements C_abc and S_abc in a Patient With Proximal LAD Balloon Occlusion

(Left) Median beat leads “a”, “b”, “c”. Cyan-colored portion of ST-segment used for calculation of diagnostic measurements. Middle (Middle) Modified left sagittal projection of the “abc”-based median QRST loops. (Right) Magnified “abc” T vector loops in the same projection. Cyan lines delineate analyzed ST-segment. Black arrow length represents the value of C_abc (=0.29 mV); magenta arrow length represents S_abc (=0.31 mV). Vector inscription velocity indicated by 2 ms inter-dot timing. Blue = preinflation; red = inflation. LAD = left anterior descending coronary artery.