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Background & Objectives: Venous thromboembolism is a common disorder that is difficult to diagnose clinically but carries significant mortality if untreated. Many diagnostic imaging algorithms for the detection of PTE, including ventilation perfusion lung scan, Doppler ultrasonography of lower extremity and pulmonary CT angiography. This study's aim was the comparison of Doppler ultrasonography of lower extremity with perfusion -ventilation lung scan in patients suspected for pulmonary emboli and finding the best approach for diagnosis of the suspected pulmonary emboli.
Methods: One hundred twenty patients of suspected pulmonary embolism referred by internists to Doppler ultrasonography of lower limbs Department of Imam's Khomeini Hospital were studied. The patients were studied within 48 hour post suspected pulmonary emboli and evaluated with V/Q scan and Doppler ultrasonography.
Results: The prevalence of DVT in lower limbs of patients suspected of pulmonary emboli was %37.5. Results of lung scan in patients suspected pulmonary emboli are as below: High probability in %17.5, intermediate probability in %27.5, low probability in %41.5 and normal in %13.5 Results of lung scan in patients suspected  for pulmonary embolism with DVT are as follow: High probability in %24.4, Intermediate probability in %33.3, low probability in %26.7 and normal in %15.6. Mean age in patients with and without DVT Was 52.53 14.13 and 56.22 17.63 year respectively.
Conclusion: Patients suspected for pulmonary emboli with normal lung scan needs more assessment for DVT in lower extremity with Doppler ultrasonography. Normal Doppler ultrasonography of lower extremity doesn't exclude performing lung scan for approving pulmonary emboli. Doppler ultrasonography and lung scan both need evaluating patients suspected for pulmonary embolism.

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  Background & Objectives: Venous thromboembolism (VTE) is one of the three causes of mortality made by cardiovascular disease and pulmonary embolism is the most common preventable causes of mortality among hospitalized patients. Considering high prevalence, the importance of etiologic studies of diseases and different previous reports regarding the role of blood groups on occurrence of diseases such as VTE, this study was carried out to determine the blood groups of the hospitalized patients with diagnosis of VTE.

  Methods: This cross-sectional study was carried out on 200 hospitalized patients with the diagnosis of deep vein thrombosis (DVT) and pulmonary embolism (PE) in Imam, Fatemi and Alavi hospitals in Ardebil. The final diagnosis was made by c olour D oppler ultrasound and pulmonary CT angiography and blood groups and risk factors were determined. Results of this study analysed along with the previous epidemiologic reports related with blood groups in Ardebil and Iran population using chi-square and t-test and SPSS software.

  Results: Of 200 patients with VTE, 140 patients were affected with DVT and 60 patients with PE. In this study, 92 patients were males and 108 were females. The mean age of patients was 52 ± 19 years. The most prevalent blood group was type A with a rate of 47.5%. There was no correlation between the diseases namely DVT or PE and blood groups (P=0.55). Frequency of type A ( OR: 2.914) and B ( OR: 1.608) in patients with VTE was more than Ardebil and Iran population but the type O (OR: 0.632) was less than those population. These differences were statistically significant. The frequency of type AB was similar in all groups.

  Conclusion: The Correlation between blood groups and venous thromboembolism, which have been discussed in many studies, have been investigated in Iran and at medical centres of Ardebil University of Medical Science for first time. It seems the type of blood groups (A and B) is effective in frequency of VTE. More studies are needed on the correlation between blood groups and VTE.