title: Retrospective analysis of 196 patients with suspected pulmonary thromboembolism.
abstract: BACKGROUND
  There has not been a statistical analysis reporting on patients with pulmonary thromboembolism (PE) in Taiwan. To identify the most common manifestations in patients with PE in Taiwan, we conducted this retrospective study.
  
  
  METHODS
  We collected and analyzed the medical records of 196 patients (53 men, mean age, 60 years; 143 women, mean age, 46 years) whose clinical symptoms and signs, chest radiographs and lung scan findings were suggestive of PE. Conventional chest radiography was performed 24 hours to 48 hours before lung scans. The radiopharmaceuticals used in lung scans were 133Xenon for ventilation studies and 99mTechnetium macroaggregated albumin for perfusion studies. All patients had received anticoagulant therapy (heparin and coumadin) to improve PE.
  
  
  RESULTS
  The two most common symptoms and signs of PE in the 196 patients were dyspnea (172/196, 87.8%) and tachypnea (176/196, 89.8%). The most common abnormal finding on chest radiography was increased lung markings, which were present in about 36.7% (72/196) of patients. Lung scans showed two or more, large, mismatched, segmental defects (high probability of PE) in both lungs in about 88.8% (174/196) of patients. After anticoagulant therapy, PE, as seen on lung scans, was resolved within four weeks in approximately 93.9% (184/196) of patients.
  
  
  CONCLUSIONS
  In Taiwan, a woman aged 40 to 50 years, with no prior history of other medical problems or surgical procedures, with sudden onset of dyspnea or tachypnea, normal or increased lung markings on chest radiography and two or more large mismatched segmental defects on lung scans, is at greatest risk of developing PE. Most patients with PE showed a good response to anticoagulant therapy within four weeks.
authors.affiliation: Department of Nuclear Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC.
authors.forename: S C
authors.initials: SC
authors.lastname: Cherng
authors.forename: W S
authors.initials: WS
authors.lastname: Huang
authors.forename: S P
authors.initials: SP
authors.lastname: Yang
authors.forename: W Y
authors.initials: WY
authors.lastname: Lai
authors.forename: Y F
authors.initials: YF
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004417:Dyspnea / Q000209:etiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011655:Pulmonary Embolism / Q000150:complications*; D013902:Radiography, Thoracic; D012189:Retrospective Studies; D013610:Tachycardia / Q000209:etiology