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Users' Guides to the Medical Literature:  III. How to Use an Article About a Diagnostic Test B. What Are the Results and Will They Help Me in Caring for My Patients?

Roman Jaeschke, MD, MSc; Gordon H. Guyatt, MD, MSc; David L. Sackett, MD, MSc; Gordon Guyatt, MD, MSc; Eric Bass, MD, MPH; Patrick Brill-Edwards, MD; George Browman, MD, MSc; Deborah Cook, MD, MSc; Michael Farkouh, MD; Hertzel Gerstein, MD, MSc; Brian Haynes, MD, MSc, PhD; Robert Hayward, MD, MPH; Anne Holbrook, MD, PharmD, MSc; Elizabeth Juniper, MCSP, MSc; Hui Lee, MD, MSc; Mitchell Levine, MD, MSc; Virginia Moyer, MD, MPH; Jim Nishikawa, MD; Andrew Oxman, MD, MSc, FACPM; Ameen Patel, MD; John Philbrick, MD; W. Scott Richardson, MD; Stephane Sauve, MD, MSc; David Sackett, MD, MSc; Jack Sinclair, MD; K.S. Trout, FRCE; Peter Tugwell, MD, MSc; Sean Tunis, MD, MSc; Stephen Walter, PhD; Mark Wilson, MD, MPH.
JAMA. 1994;271(9):703-707. doi:10.1001/jama.1994.03510330081039.
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CLINICAL SCENARIO  You are back where we put you in the previous article1 on diagnostic tests in this series on how to use the medical literature: in the library studying an article that will guide you in interpreting ventilation-perfusion (V/Q) lung scans. Using the criteria in Table 1, you have decided that the Prospective Investigation of Pulmonary Diagnosis (PIOPED) study2 will provide you with valid information. Just then, another physician comes looking for an article to help with the interpretation of V/Q scanning. Her patient is a 28-year-old man whose acute onset of shortness of breath and vague chest pain began shortly after completing a 10-hour auto trip. He experienced several episodes of similar discomfort in the past, but none this severe, and is very apprehensive about his symptoms. After a normal physical examination, electrocardiogram and chest radiograph, and blood gas measurements that show a Pco2 of

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The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
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