Six-Minute Walk: Imaging and Clinical Characteristics According to V/Q Results
| Characteristic | Normal V/Q (n = 77) | Abnormal V/Q (n = 65) | P | Total (n = 142) |
| 6-min-walk test distance, mean (m) | 442.3 (SD, 110.6) (n = 58) | 382.8 (SD, 122.3), (n = 48) | 0.010 | 106 |
| TRV, mean (m/s) | 2.7 (SD, 0.5) (n = 72) | 3.2 (SD, 0.7) (n = 63) | <0.0001 | 135 |
| RVSP, mean (mm Hg) | 35.2 (SD, 13.0) (n = 66) | 48.6 (SD, 19.2) (n = 58) | <0.0001 | 124 |
| CTPA (n) | 60 | |||
| Positive for PE | 2 (12.5%) | 14 (87.5%) | 0.034 | 16 |
| Negative for PE | 19 (43.2%) | 25 (56.8%) | 44 | |
| History of ACS (n) | 141 | |||
| Yes | 38 (52.8%) | 34 (47.2%) | 0.785 | 72 |
| No | 38 (55.1%) | 31 (44.9%) | 69 | |
| Prior history of DVT (n) | 139 | |||
| Yes | 19 (51.4%) | 18 (48.6%) | 0.788 | 37 |
| No | 55 (53.9%) | 47 (46.1%) | 102 | |
| Prior history of PE (n) | 139 | |||
| Yes | 12 (26.7%) | 33 (73.3%) | <0.0001 | 45 |
| No | 62 (66.0%) | 32 (34.0%) | 94 | |
| Anticoagulation use (n) | 138 | |||
| Yes | 22 (34.4%) | 42 (65.6%) | <0.0001 | 64 |
| No | 51 (68.9%) | 23 (31.1%) | 74 | |
| PAH treatment (n) | 142 | |||
| Yes | 11 (27.5%) | 29 (72.5%) | <0.0001 | 40 |
| No | 66 (64.7%) | 36 (35.3%) | 102 | |
| Death (n) | 142 | |||
| Yes | 13 (38.2%) | 21 (61.8%) | 0.032 | 34 |
| No | 64 (59.3%) | 44 (40.7%) | 108 |
RVSP = right ventricular systolic pressure; ACS = acute chest syndrome; DVT = deep-vein thrombosis; PAH = pulmonary arterial hypertension.