Objectives: Pulmonary thromboembolism (PTE) is an emergent disease with high mortality. Wells and revised Geneva
scores are commonly used probability scales in PTE diagnosis. Computed tomography pulmonary angiography (CTPA) is
the radiological diagnostic method. We aimed to determine computed tomography pulmonary arterial obstruction index
ratio (CTPAOIR) which indicates degree and the extent of the thrombotic pulmonary arterial occlusion and compare
Wells and revised Geneva scale with CTPAOIR, parenchymal enfarct and pleural effusion.
Material and Methods: CTPA was performed to 69 patients with the prediagnosis of PTE by using 6-slice multidetector
CT scanner (Philips, Netherland). Patients were divided into three groups as high, intermediate and low risk groups according
to Wells and revised Geneva scores. Patients with PTE were regrouped and CTPAOIR, pleural effusion and parenchymal
infarct presence were compared.
Results: In the present study 50 (72.5%) of 69 patients had PTE diagnosis. While no significant correlation was found between
CTPAOIR and pleural effusion presence had no significant correlation with Wells clinic scores (p > 0.05),
CTPAOIR and parenchyml infarct presence had significant correlation (p = 0.044). No correlations between CTPAOIR,
pleural effusion and parenchyml infarct presence with revised Geneva scores were found (p > 0.05). CTPAOIR was significantly
correlated with pleural effusion and parenchymal infarct presence (p = 0.040 vs p = 0.002). There were no significant
differences among patient groups according to Wells and revised Geneva scores in terms of CTPAOIR (p > 0.05).
Conclusions: We determined the increased probability of parenchymal enfarct with higher Wells scores. Parenchymal enfarct
and pleural effusion in CTPA may indicate the presence of PTE in subsegmental and/or distal pulmonary arteries.