Table 3.
Bi-atrial phasic volume indexes and emptying fractions at sea level and high altitude
| Left atrium (n = 82) | Right atrium (n = 82) | |||||
|---|---|---|---|---|---|---|
| Sea level | High altitude | P-value | Sea level | High altitude | P-value | |
| Maximal volume index (ml/m2) | 18.4 (15.7, 22.6) | 15.4 (12.7, 20.3) | 0.003 | 18.5 ± 5.5 | 17.8 ± 5.5 | 0.423 |
| Minimal volume index (ml/m2) | 5.92 (3.90, 8.40) | 5.07 (3.45, 7.74) | 0.236 | 7.03 (5.35, 9.30) | 7.81 (6.05, 10.07) | 0.059 |
| Pre-systolic volume index (ml/m2) | 11.27 (8.31, 13.85) | 9.28 (6.36, 12.11) | 0.007 | 12.5 (9.54, 15.4) | 12.5 (10.0, 16.3) | 0.767 |
| Reservoir function | ||||||
| Total emptying volume index (ml/m2) | 12.3 (10.3, 15.2) | 10.4 (8.6, 13.1) | < 0.001 | 10.86 (8.44, 13.87) | 9.23 (6.99, 11.44) | 0.006 |
| Total emptying fraction (%) | 67.0 ± 10.7 | 66.2 ± 11.3 | 0.626 | 59.7 ± 11.6 | 54.5 ± 12.3 | 0.001 |
| Expansion index (%) | 215.6 (152.8, 274.0) | 189.4 (136.8, 302.5) | 0.699 | 154.8 (97.5, 215.9) | 117.3 (89.4, 171.7) | 0.006 |
| Conduit function | ||||||
| Passive emptying volume index (ml/m2) | 7.61 ± 2.99 | 7.06 ± 2.91 | 0.181 | 5.06 (3.02, 7.73) | 4.85 (3.19, 7.02) | 0.267 |
| Passive emptying fraction (%) | 40.5 ± 14.2 | 42.8 ± 14.2 | 0.285 | 30.2 ± 13.4 | 29.3 ± 14.7 | 0.664 |
| Contractile function | ||||||
| Active emptying volume index (ml/m2) | 4.31 (3.37, 6.44) | 3.16 (2.42, 4.73) | 0.001 | 4.45 (3.39, 6.97) | 4.08 (2.76, 5.59) | 0.029 |
| Active emptying fraction (%) | 44.2 (36.2, 53.1) | 37.7 (30.0, 48.3) | 0.073 | 41.7 ± 13.9 | 35.4 ± 12.2 | 0.001 |
Data are expressed as mean ± SD, or median (interquartile range). Bold values indicate statistically significant