Comprehensive analysis of the results of the PIOPED Study. Prospective Investigation of Pulmonary Embolism Diagnosis Study.
The goals of this review were to summarize the published data from the National Heart, Lung and Blood Institute sponsored Prospective Investigation of Pulmonary Embolism Diagnosis (PIOPED) study, present new data from the entire population and provide a comprehensive criteria for ventilation-perfusion (V/Q) lung scan interpretation.


METHODS
Data from the PIOPED frequent user tape and journal articles published between 1990 and 1994 and indexed on Medline that presented data from the PIOPED study were reviewed.


RESULTS
A normal V/Q lung scan excludes the diagnosis of clinically significant PE. The usefulness of the V/Q lung scan was optimized when interpreted as representing a very low, low or high probability of PE with a concordant clinical likelihood of PE. Patients with a V/Q lung scan interpreted as representing an intermediate probability of PE or patients with discordant clinical likelihood of PE and lung scan interpretation will often require further investigations to diagnose or exclude acute venous thromboembolism.


CONCLUSIONS
The results of the PIOPED study support the use of V/Q lung scanning in the diagnostic evaluation of patients with suspected PE. Amendments to the original PIOPED interpretation criteria should reinforce the role of V/Q lung scanning in patients with suspected PE.
Division of Nuclear Medicine, Vancouver Hospital and Health Sciences Center, Canada.
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Worsley
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Alavi
D000328:Adult; D006801:Humans; D015994:Incidence; D008168:Lung / Q000000981:diagnostic imaging*; D011237:Predictive Value of Tests; D015995:Prevalence; D011446:Prospective Studies; D011651:Pulmonary Artery / Q000000981:diagnostic imaging; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging* / Q000453:epidemiology; D011859:Radiography; D011877:Radionuclide Imaging; D012307:Risk Factors; D012680:Sensitivity and Specificity; D013668:Technetium Tc 99m Aggregated Albumin; D014692:Ventilation-Perfusion Ratio; D014980:Xenon Radioisotopes
D013668:Technetium Tc 99m Aggregated Albumin; D014980:Xenon Radioisotopes