Pulmonary embolism in cancer: clinical analysis of 60 cases

Abstract

To enhance the understanding of pulmonary thromboembolism (PTE) in patients with cancer. from January 2005 to July 2008, sixty patients diagnosed as pulmonary thromboembolism in Peking Union Medical College Hospital were retrospectively reviewed. The primary cancers were from respiratory system (36.7%), digestive system (26.7%), urogenital system (10.0%), hematological system (8.3%) and nervous system (5.0%), respectively, especially from such organ as lung (30.0%), stomach (8.3%), pancreas (6.7%), liver (5.0%) and so on. 12 of 18 patients (66.7%) with lung cancer were adenocarcinoma. There were 47 patients (78.3%) with advanced cancer. Deep venous thrombosis (DVT) occurred in 30 patients (50.0%). Of them 24 patients (80.0%) occurred in the lower limb, and 3 patients (10%) in the upper limb, 5 patients (16.7%) in other sites including 2 cases with thrombi in both upper and lower limbs, respectively. There were 2 patients (3.3%) accompanied with femoral artery embolism. PTE before tumor diagnosed occurred in 5 patients (8.3%) with an average time of 5.5 months. 22 patients underwent cancer-related operation and 17 patients (77.3%) had PTE in the later 2 weeks. 15 patients (25.0%) showed no symptoms. Arterial oxygen partial pressure was reduced in 49 patients (84.5%). 13 patients (21.7%) died and 6 cases of them were sudden death. 8 patients (13.3%) aggravated. 39 patients (65.0%) improved. PTE is one of the major complications and leading causes of death in patients with cancer. Of which lung cancer is most commonly, pulmonary adenocarcinoma in particular. PTE is often accompanied by DVT in the lower extremity. Risk factors may be old age, cancer progression and cancer-related operation. Other factors include long time in bed, chemotherapy and central vein catheterization, and so on. It should be watchful of PTE in cancer patients undergoing operation, especially within the first two postoperative weeks. Its clinical manifestation is often atypical. Sometimes venous thromboembolism (VTE) is the first signal of malignancy. In patients with unexplained PTE and/or DVT, attention should be paid to the possibility of malignancy. The first choice of anticoagulants is low molecular weight heparin.