Table 2.
Strain parameters of each myocardial strain analysis modality
| CMR tagging | CMR feature tracking | STE | |
|---|---|---|---|
| Basic strain septum | |||
| (1) AVC strain septum (%) | 2.4 ± 5.8 | − 1.1 ± 5.0 | − 6.8 ± 7.1 |
| (2) Peak strain septum (%) | − 4.0 ± 2.8 | − 5.1 ± 3.6 | − 10.4 ± 5.4 |
| (3) TTPmax septum (ms) | 195 ± 179 | 379 ± 211 | 459 ± 173 |
| (4) Systolic strain rate septum (%/s) | 5.4 ± 16.4 | − 3.0 ± 12.9 | − 15.9 ± 16.1 |
| (5) Diastolic strain rate septum (%/s) | − 1.1 ± 10.8 | 2.1 ± 10.9 | − 1.9 ± 29.0 |
| Basic strain lateral wall | |||
| (1) AVC strain lateral (%) | − 12.6 ± 3.2 | − 12.0 ± 3.5 | − 14.5 ± 5.3 |
| (2) Peak strain lateral (%) | − 13.4 ± 2.7 | − 12.4 ± 3.6 | − 15.8 ± 5.5 |
| (3) TTPmax lateral (ms) | 424 ± 33 | 404 ± 31 | 474 ± 52 |
| (4) Systolic strain rate lateral (%/s) | − 32.2 ± 7.9 | − 30.8 ± 9.3 | − 32.8 ± 11.9 |
| (5) Diastolic strain rate lateral (%/s) | 29.7 ± 13.2 | 27.8 ± 13.7 | 12.5 ± 25.0 |
| Dyssynchrony | |||
| (a) Onset-delay (ms) | 55 ± 25 | 58 ± 46 | 57 ± 61 |
| (b) Peak-delay (ms) | 268 ± 127 | 189 ± 104 | 144 ± 104 |
| (c) TTPSD (ms) | 149 ± 48 | 159 ± 44 | 149 ± 52 |
| Discoordination septal and lateral wall | |||
| (d) SRSsept (%) | 7.2 ± 4.5 | 3.8 ± 2.6 | 3.6 ± 3.9 |
| (e) SSI (%) | 8.7 ± 5.5 | 5.1 ± 3.8 | 5.0 ± 4.4 |
| (f) ISFsep–lat | 0.43 ± 0.25 | 0.29 ± 0.21 | 0.25 ± 0.16 |
| (g) Septal strain patterns (n, %) | |||
| LBBB-1 | 7 (26) | 5 (19) | 10 (37) |
| LBBB-2 | 15 (56) | 13 (48) | 6 (22) |
| LBBB-3 | 5 (19) | 9 (33) | 11 (41) |
| Discoordination total LV | |||
| (h) ISFLV | 0.46 ± 0.22 | 0.35 ± 0.17 | 0.37 ± 0.13 |
| (i) CURE | 0.81 ± 0.09 | 0.77 ± 0.09 | 0.78 ± 0.06 |
CMR cardiac magnetic resonance imaging, TAG tagging, FT feature tracking, STE speckle tracking echocardiography, AVC strain strain value at aortic valve closure, TTP max time to maximal peak shortening, onset-delay time delay between onset of shortening of septal and lateral wall, peak-delay septal to lateral wall delay of TTPmax, TTP SD standard deviation if time to peak max of all segments, SRS sept septal systolic rebound stretch, SSI systolic stretch index, ISF sep–lat internal stretch factor of septum and lateral wall, ISF LV internal stretch factor of all left ventricular segments, CURE circumferential uniformity ratio estimates