title: Diagnosis of pulmonary embolism with helical C.T. scan.
abstract: OBJECTIVE
  To determine the role of helical C.T. scan in the diagnosis of pulmonary embolism.
  
  
  METHODS
  Radiology department, Aga Khan University Hospital. One year prospective study May 2001 to May 2002.
  
  
  METHODS
  Sixty patients suspected of having pulmonary embolism were included in this study. Helical C.T. scan chest was performed from aortic arch to lung bases with intravenous contrast medium. Images were acquired in mediastinal and lung windows. Image interpretation was performed on the console and hard copies for main branch and segmental thrombus.
  
  
  RESULTS
  Fifteen patients were diagnosed of having pulmonary embolism on C.T. scan. Clinical correlation and follow up with pulmonary angiography and Doppler ultrasound of leg was carried out. Pulmonary angiography was performed in one patient with embolectomy done after confirmation of diagnosis. 8 patients had associated DVT confirmed on Doppler sonography. Sensitivity of helical C.T. is 93.75%, specificity 100% and positive predictive value 95.65%.
  
  
  CONCLUSIONS
  Helical CT scan is a quick, easy and accurate imaging modality for diagnosing pulmonary embolism.
authors.affiliation: Radiology Department, Aga Khan University Hospital, Karachi.
authors.forename: M U
authors.initials: MU
authors.lastname: Usman
authors.forename: V
authors.initials: V
authors.lastname: Bari
authors.forename: J
authors.initials: J
authors.lastname: Yaqoob
authors.forename: M
authors.initials: M
authors.lastname: Murad
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011446:Prospective Studies; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging*; D012680:Sensitivity and Specificity; D036542:Tomography, Spiral Computed