Table 3. Comparison of stratified longitudinal strain and MW parameters in the derivation set.
| Variable | HFpEF group (n=49) | Control group (n=46) | P value |
|---|---|---|---|
| GLSendo (%) | −21.13±2.57 | −24.18±1.90 | <0.001 |
| GLSmyo (%) | −18.52±2.31 | −20.46±1.67 | <0.001 |
| GLSepi (%) | −16.37±1.38 | −17.59±0.96 | <0.001 |
| ΔGLS (%) | −4.76±1.28 | −6.58±0.97 | <0.001 |
| GWI (mmHg%) | 1,797.02±251 | 2,099.78±289 | <0.001 |
| GCW (mmHg%) | 2,092.18±256 | 2,386.24±301 | <0.001 |
| GWW (mmHg%) | 87.48 [66.23–121.50] | 60.50 [48.75–73.75] | <0.001 |
| GWE (%) | 94 [92–96] | 98 [96.75–99] | <0.001 |
Data are expressed as the mean ± SD or M [P25–P75]. MW, myocardial work; HFpEF, heart failure with preserved ejection fraction; GLSendo, global longitudinal strain of subendocardium; GLSmyo, global longitudinal strain of myocardium; GLSepi, global longitudinal strain of subepicardium; ΔGLS, transmural gradient of global longitudinal strain; GWI, global myocardial work index; GCW, global myocardial constructive work; GWW, global myocardial wasted work; GWE, global myocardial work efficiency.