title: [Risk factors and clinical features of deep venous thrombosis: a report of 388 cases].
abstract: OBJECTIVE
  To investigate the risk factors and clinical characteristics of deep venous thrombosis (DVT) and pulmonary thromboembolism (PTE).
  
  
  METHODS
  The clinical manifestations and risk factors in 388 patients with DVT were retrospectively studied.
  
  
  RESULTS
  The ratio of DVT cases in hospitalized patients had a trend of increasing in recent years. 80.4% of the patients with DVT had risk factors. The most common risk factors were age over 40 years old (88.9%), heart disease (43.0%), hypertension (35.1%), long term immobilization (21.1%), and infection (20.1%). The most common clinical presentations of DVT were swelling (66.2%) and pain (40.5%) of the affected extremity. Calf swelling by more than or equal to 1 cm compared with the asymptomatic leg was found in 87.2% patients. The site of DVT was more common in left extremities and proximal veins. PTE was found in 34.5% of the DVT cases and 74.6% of them were diagnosed prior to DVT. The ratio of PTE caused by DVT didn't show significant difference between left and right legs, neither between proximal and distal veins.
  
  
  CONCLUSIONS
  The ratio of DVT cases in hospitalized patients was increasing. Most patients with DVT had risk factors. DVT was usually asymptomatic before PTE was complicated.
authors.affiliation: Beijing Chaoyang Hospital-Beijing Institute of Respiratory Medicine, Capital University of Medical Science, Beijing 100020, China.
authors.forename: Kui-Kui
authors.initials: KK
authors.lastname: Sun
authors.forename: Chen
authors.initials: C
authors.lastname: Wang
authors.forename: Xia-Ti
authors.initials: XT
authors.lastname: Guli
authors.forename: Qin
authors.initials: Q
authors.lastname: Luo
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D002318:Cardiovascular Diseases; D005260:Female; D006801:Humans; D006973:Hypertension; D008297:Male; D008875:Middle Aged; D010690:Phlebography; D011655:Pulmonary Embolism / Q000209:etiology / Q000517:prevention & control; D012189:Retrospective Studies; D012307:Risk Factors; D020246:Venous Thrombosis / Q000150:complications / Q000175:diagnosis* / Q000473:pathology