Table 1: The value of using binary logistic stepwise regression
analysis to detect viable myocardium using different S and Sr parameters
in the resting state.
Subsequently, LS, LSr and ROC curves were plotted to determine the
optimal cutoff points for detecting viable myocardium using STE.
Accordingly, sensitivity, specificity, and accuracy were calculated
(Fig. 2A-D, Table 2 and 3).
In the DM group, the cutoff point for LSrest was
determined to be -13.27, with 46 out of 117 segments classified as
viable myocardium (LSrest ≤ -13.27) and 71
segments as non-viable myocardium (LSrest> -13.27) according to the gold standard. Similarly, for
LSLDDSE in the DM group, the cutoff point was
-13.81, with 83 segments classified as viable myocardium (LSLDDSE ≤
-13.81) and 34 segments as non-viable myocardium
(LSLDDSE > -13.81). In terms of
LSrrest, the cutoff point was -0.875, resulting
in 98 segments classified as viable myocardium
(LSrrest ≤ -0.875) and 19 segments as non-viable
myocardium (LSrrest > -0.875)
according to the gold standard. In the DM group,
LSrLDDSE had a cutoff point of -1.12, with 108
segments classified as viable myocardium
(LSrLDDSE ≤ -1.12) and 9 segments as non-viable
myocardium (LSrLDDSE > -1.12).
In the non-DM group, the cutoff point for LSrestwas -12.33, with 123 out of 248 segments classified as viable myocardium
(LSrest ≤ -12.33) and 125 segments as non-viable
myocardium (LSrest > -12.33)
according to the gold standard. Similarly, for LSLDDSE in the non-DM
group, the cutoff point was -14.075, with 171 segments classified as
viable myocardium (LSLDDSE ≤ -14.075) and 77
segments as non-viable myocardium (LSLDDSE> -14.075). Regarding LSrrest , the
cutoff point was -1.075, resulting in 156 segments classified as viable
myocardium (LSrrest ≤ -1.075) and 92 segments as
non-viable myocardium (LSrrest >
-1.075) according to the gold standard. In the non-DM group,
LSrLDDSE had a cutoff point of -1.305, with 192
segments classified as viable myocardium
(LSrLDDSE ≤ -1.305) and 56 segments as non-viable
myocardium (LSrLDDSE > -1.305)
according to the gold ststandard.