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Table 1 The mean ± SD and frequency (%) of radiologic features in patients with low-risk and high-risk pulmonary embolism

From: The assessment of acute pulmonary embolism severity using CT angiography features

CTA variablesPatients with Low-risk PE (n = 104)Patients with high-risk PE (n = 46)P value
Gender
 Male, n (%)
 Female, n (%)
65 (62.5%)32 (69.6%)0.404
39 (37.5%)14 (30.4%)
Age51.4 ± 16.669.3 ± 14.0< 0.001
PESI76.5 ± 21.8120.6 ± 23.4< 0.001
Obstruction index9.4 ± 7.617.3 ± 7.6< 0.001
RV (mm)38.7 ± 40.736.9 ± 8.00.778
LV (mm)39.2 ± 6.138.6 ± 7.60.595
Pulmonary trunk size (mm)26.5 ± 3.928.5 ± 4.4 
 Normal, n (%)86 (82.7%)24 (52.2%)< 0.05
 Abnormal, n (%)18 (17.3%)22 (47.8%)
RV/LV ratio1.0 ± 1.31.0 ± 0.30.857
Backwash contrast, n (%)
 Present39 (37.5%)28 (60.9%)< 0.01
 Absent65 (62.5%)18 (39.1%)
Septal morphology, n (%)
 Normal71 (68.3%)20 (43.5%)< 0.01
 Abnormal33 (31.7%)26 (56.5%)
Location of embolism
 Segmental artery48 (46.2%)4 (8.7%)< 0.001
 Lobar artery25 (24%)9 (19.6%)
 Main artery31 (29.8%)33 (71.7%)
  1. PE Pulmonary embolism, PESI pulmonary embolism severity index, RV right ventricle, LV left ventricle