title: The predictability of matched ventilation perfusion scan in pulmonary embolism.
abstract: In retrospect, we reviewed 17 cases of proven pulmonary emboli at Taichung VGH. These patients were then divided into two groups, the matched and the mismatched V/Q scan. Patients with lung consolidation, along with their chest films, were studied and characterized. In the matched V/Q group (5 cases), perfusion defects were comparable with lung consolidation in both size and location. In the V/Q mismatched group, perfusion defects were larger than lung consolidation (either single or multiple foci). A matched V/Q scan in patients with a pulmonary embolism, may result from lung consolidation induced by a pulmonary infarction, localized edema, or hemorrhage. A matched V/Q scan with localized lung consolidation in a suspicious case could not rule out pulmonary embolism, and further evaluation is mandatory.
authors.affiliation: Division of Chest Medicine, 803 Army General Hospital, Taichung, Taiwan, R.O.C.
authors.forename: K W
authors.initials: KW
authors.lastname: Su
authors.forename: C D
authors.initials: CD
authors.lastname: Chiang
authors.forename: M S
authors.initials: MS
authors.lastname: Lin
authors.forename: C L
authors.initials: CL
authors.lastname: Chuang
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging* / Q000503:physiopathology; D011877:Radionuclide Imaging; D012189:Retrospective Studies; D014692:Ventilation-Perfusion Ratio