title: Risk of asymptomatic pulmonary embolism in patients with deep venous thrombosis.
abstract: OBJECTIVE
  The aim of our study is to evaluate the incidence of asymptomatic pulmonary embolism (PE) in patients with deep venous thrombosis (DVT), submitted to routine angiography of pulmonary vessels, and analyze the relationship between the site of DVT and extent of PE.
  
  
  METHODS
  Between January 2006 and April 2012, 52 consecutive patients with acute inferior limb DVT were divided into two study groups composed of individuals with proximal and distal thrombotic involvement. All patients had no respiratory symptoms and were submitted to routine pulmonary computed tomography angiography for active investigation of PE. We assessed the incidence and extent of PE in both study groups.
  
  
  RESULTS
  Thirty-eight patients (72%) had PE, detected by computed tomography angiography. The incidence of PE in patients with proximal and distal thrombosis, respectively, was 72.7% and 73.7%. Occurrence of segmental embolism was equally high in both groups, affecting 71.4% of the patients with distal thrombosis and 66.6% of the individuals with proximal DVT (P > .99).
  
  
  CONCLUSIONS
  The incidence of asymptomatic PE observed in patients with DVT is higher than what is reported in the current literature. This supports the importance of screening and the need for high levels of suspicion regarding this complication.
authors.affiliation: Department of Vascular and Endovascular Surgery, Hospital Israelita Albert Einstein, São Paulo, Brazil. Electronic address: mari.krutman@ig.com.br.
authors.forename: Mariana
authors.initials: M
authors.lastname: Krutman
authors.affiliation: Department of Vascular Surgery, Hospital Israelita Albert Einstein, São Paulo, Brazil; Division of Vascular Surgery, Hospital das Clínicas, University of São Paulo Medical School, São Paulo, Brazil.
authors.forename: Nelson
authors.initials: N
authors.lastname: Wolosker
authors.affiliation: Department of Vascular Surgery, Hospital Israelita Albert Einstein, São Paulo, Brazil.
authors.forename: Sérgio
authors.initials: S
authors.lastname: Kuzniec
authors.affiliation: Department of Clinical Pathology, Hospital Israelita Albert Einstein, São Paulo, Brazil.
authors.forename: João Carlos
authors.initials: JC
authors.lastname: de Campos Guerra
authors.affiliation: Department of Radiology, Hospital Israelita Albert Einstein, São Paulo, Brazil.
authors.forename: Adriano
authors.initials: A
authors.lastname: Tachibana
authors.affiliation: Department of Vascular Surgery, Hospital Israelita Albert Einstein, São Paulo, Brazil.
authors.forename: Cynthia
authors.initials: C
authors.lastname: de Almeida Mendes