Systematic lung scans reveal a high frequency of silent pulmonary embolismin patients with proximal deep venous thrombosis

Background: A high frequency of asymptomatic pulmonary embolism (PE) has be en reported in patients with deep venous thrombosis (DVT) in studies of a l imited number of patients using varying criteria for lung scan assessment. Objectives: To estimate the frequency of PE using systematic lung scans in a large group of outpatients with DVT and to compare the results using vary ing lung scan assessment criteria. Methods: An international multicenter study comparing 2 different regimens of low-molecular-weight heparin nadroparin in DVT: perfusion lung scans wer e performed in 622 outpatients with no clinical indication of PE and with p roximal DVT confirmed by venography. Three hundred seventy nine of these pa tients underwent ventilation lung scans. High-probability (HP) scans for PE were assessed separately using either ventilation scans or chest radiograp hs to define mismatched perfusion defects. Results: Perfusion scans showed abnormalities in 82% of the patients; 59% h ad segmental defects and 30% had normal scans or scans with a very low prob ability of PE. Depending on the criteria used, 32% to 45% had HP scans for PE; these percentages were higher in young patients. No relationship was fo und between extent of thrombosis and HP scans. The estimated frequency of s ilent PE was 39.5% to 49.5%. During a 3-month follow-up period during which the patients received therapy, the rate of PE recurrence was low (1.3%) an d did not differ between patients with baseline HP scans and those with nor mal scans. Conclusions: Regardless of what interpretative criteria are used for assess ing lung scans in PE, the frequency of silent PE is 40% to 50% in patients with DVT. A baseline lung scan may easily detect PE in these patients but i s not useful for predicting early thromboembolic recurrences that may occur during therapy.