TABLE 1.
Chamber volumes and function
| Baseline | Chronic paced | P value | |
|---|---|---|---|
| Left ventricle | |||
| LVEDV (mL) | 103 ± 22 | 203 ± 25 | <.001 |
| LVESV (mL) | 44 ± 14 | 145 ± 32 | <.001 |
| LVSV (mL) | 59 ± 12 | 58 ± 16 | .932 |
| LVEF (%) | 58 ± 8 | 29 ± 9 | <.001 |
| Left atrium | |||
| Volumes | |||
| LAV MAX (mL) | 90 ± 21 | 206 ± 41 | <.001 |
| LAV REL MAX (mL) | 81 ± 19 | 198 ± 41 | <.001 |
| LAV MIN (mL) | 65 ± 20 | 187 ± 40 | <.001 |
| LAV REL MIN (mL) | 79 ± 19 | 187 ± 40 | <.001 |
| Reservoir | |||
| LACC (mL) | 25 ± 8 | 19 ± 6 | .01 |
| LAPTE (%) | 28 ± 9 | 9 ± 3 | <.001 |
| LAEI (%) | 42 ± 20 | 11 ± 3 | .002 |
| LARV (mL) | 11 ± 6 | 19 ± 7 | .003 |
| Conduit | |||
| LAPE (%) | 35 ± 14 | 42 ± 20 | .191 |
| LAPEI (%) | 9 ± 5 | 4 ± 3 | .002 |
| LACV (mL) | 33 ± 11 | 29 ± 9 | .48 |
| Booster pump | |||
| LAAE (%) | 65 ± 14 | 57 ± 20 | .191 |
| LAAEI (%) | 20 ± 9 | 6 ± 3 | .002 |
| LAEF (%) | 19 ± 8 | 5 ± 3 | .001 |
| LABPV (mL) | 16 ± 5 | 11 ± 5 | .006 |
| LA segmental Shortening | |||
| Medial (%) | 31 ± 17 | 8 ± 5 | .001 |
| Lateral (%) | 34 ± 12 | 10 ± 4 | .003 |
| Anterior (%) | 26 ± 11 | 7 ± 5 | .006 |
| Posterior (%) | 42 ± 6 | 13 ± 11 | .001 |
All volumes are adjusted to BSA. BSAwas calculated by using the following formula: BSA = 0.097 × (kg body weight)0.633.7 LVEDV, Left ventricular end-diastolic volume; LVESV, left ventricular end-systolic volume; LVSV, left ventricular stroke volume; LVEF, left ventricular ejection fraction; LAV MAX, maximal left atrial volume; LAV REL MAX, relative maximal left atrial volume; LAV MIN, minimum left atrial volume; LA REL MIN, relative minimal left atrial volume; LACC, left atrial volume change; LAPTE, left atrial percentage total emptying; LAEI, left atrial expansion index; LARV, left atrial reservoir volume; LAPE, left atrial passive percentage of total emptying; LAPEI, left atrial passive emptying index; LACV, left atrial conduit volume; LAAE, left atrial active emptying percentage of total emptying; LAAEI, left atrial active emptying index; LAEF, left atrial active ejection fraction; LABPV, left atrial booster pump volume; LA, left atrial.