Table 2. SAX versus LAX real-time free-breathing approaches for peak exercise and reserve LV volumes and function.
| Parameter | Exercise Values | Reserve Values (Exercise–Rest) | ICC Comparison | |||
|---|---|---|---|---|---|---|
| LAX | SAX | LAX | SAX | Exercise LAX vs SAX | Reserve LAX vs SAX | |
| End-diastolic (mL) | 149±25 | 147±23 | 6±10 | 7±11 | 0.94 | 0.55 |
| End-systolic volume (mL) | 38±9 | 38±9 | -11±6 | -9±6 | 0.96 | 0.82 |
| Stroke volume (mL) | 111±19 | 109±18 | 16±8 | 16±9 | 0.92 | 0.43 |
| Ejection fraction (%) | 75±4 | 74±4 | 9±3 | 8±3 | 0.94 | 0.74 |
| Cardiac output (L/min) | 15.5±3.3 | 15.2±2.9 | 9.4±2.6 | 9.0±2.4 | 0.94 | 0.90 |
| Heart rate (bpm) | 140±17 | 140±17 | 74±16 | 73±17 | - | 0.93 |
| GLS (%) | -29.2±2.6 | - | -4.7±2.3 | - | - | - |
Data are mean ± standard deviation. Abbreviations: SAX, short-axis; LAX, long-axis; LV, left ventricular; ICC, intraclass correlation; GLS, global longitudinal strain.