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Table 4 Segmental analysis of strain (ε) pre and post PCI and transmurality post-PCI

From: Longitudinal peak strain detects a smaller risk area than visual assessment of wall motion in acute myocardial infarction

PrePCI WMSI Normal Abnormal
Follow-up WMSI Deteriorated Unchanged Deteriorated Unchanged Improved
n 7 152 15 141 75
WMSI (mean ± SD)      
   Preop 1.0 ± 0.0 1.0 ± 0.0 1.6 ± 0.4 1.8 ± 0.6 2.3 ± 0.5
   Postop 1.7 ± 0.2 1.1 ± 0.1 2.3 ± 0.4 1.6 ± 0.6 1.3 ± 0.5
   Post-pre-difference 0.7 ± 0.2 0.1 ± 0.1 0.7 ± 0.2 -0.2 ± 0.2 -1.0 ± 0.3
Strain (mean ± SD)      
   Preop -15.1 ± 5.7 -16.6 ± 5.6 -11.8 ± 7.1 -11.4 ± 8.0 -9.4 ± 7.9
   Postop -16.6 ± 5.2 -17.4 ± 5.2 -13.4 ± 8.1 -15.0 ± 7.7 -14.3 ± 6.8
   Post-pre-difference -1.5 ± 5.1 -0.8 ± 6.5 -1.6 ± 3.7 -3.7 ± 7.3 -4.9 ± 8.3
Strain (segments; n (%))      
   Preop      
Normal 5 (71) 129 (85) 9 (60) 86 (61) 32 (43)
Abnormal 2 (29) 23 (15) 6 (40) 55 (39) 43 (57)
   Postop      
Deteriorated 1 (14) 25 (16) 0 (0) 11 (8) 9 (12)
Unchanged 4 (57) 89 (59) 11 (73) 79 (56) 31 (41)
Improved 2 (29) 38 (25) 4 (27) 51 (36) 35 (47)
Transmurality (segments; n (%))      
   Postop      
Normal (<1%) 7 (100) 142 (93) 9 (60) 82 (58) 43 (57)
≥ 1% 0 (0) 10 (7) 6 (40) 59 (42) 32 (43)
> 50% 0 (0) 0 (0) 5 (33) 25 (18) 20 (27)
  1. Segmental analysis of strain (ε) pre and post PCI and infarction transmurality post-PCI calculated for normal and abnormal PCI wall motion score index (WMSI) preoperatively, in turn related to the different outcomes postoperatively (deteriorated, unchanged and improved).