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Validity of the polymyalgia rheumatica activity score in primary care practice
  1. A Binard1,
  2. B Lefebvre1,
  3. M De Bandt2,
  4. J-M Berthelot3,
  5. A Saraux1,
  6. and the Club “Rhumatismes et Inflammation”
  1. 1
    Rheumatology Unit, Brest Teaching Hospital, Brest, France
  2. 2
    Rheumatology Unit, Robert Ballanger Hospital, Aulnay sous Bois, France
  3. 3
    Rheumatology Unit, Nantes Teaching Hospital, Nantes, France
  1. Professor A Saraux, Rheumatology Unit, Hôpital de la Cavale Blanche, BP 824, F 29609 Brest cedex, France; Alain.Saraux{at}chu-brest.fr

Abstract

Objective: To evaluate the validity and reliability of the polymyalgia rheumatica (PMR) activity score (PMR-AS) for relapse diagnosis by general practitioners (GPs) who manage a large proportion of patients with PMR.

Methods: Seven clinical vignettes of PMR were used, for which 35 rheumatologists previously made a diagnosis of relapse or no relapse with greater than 80% agreement. These vignettes were submitted to 163 GPs, who were asked to assess disease activity using a visual analogue scale (VASph), this being the only physician-dependent component of the PMR-AS. The 1116 available vignette–GP combinations were used to assess differences in VASph assessed by GPs versus rheumatologists. Statistical associations linking a relapse diagnosis by the rheumatologists (the reference standard) to the value of the GP-assessed PMR-AS or its components (GP-assessed VASph, visual analogue scale pain score, C-reactive protein, morning stiffness and elevation of upper limbs) were evaluated.

Results: No significant differences were found between VASph scores by GPs versus rheumatologists for any of the vignettes. A relapse diagnosis was strongly associated with PMR-AS values of 7 or more (sensitivity 99.4%; specificity 93.3%; agreement 95.9% (95% CI 94.5% to 97.0%) with κ  =  0.92). Of the 590 GP–vignette combinations with PMR-AS values lower than 7, all but three (0.5%) had no relapse diagnosis. Of 510 combinations with PMR-AS values of 7 or more, only 42 (8%) had no flare diagnosis.

Conclusions: This study supports the validity of the PMR-AS in primary care practice and provides evidence that a good scoring system can be useful to guide clinical and therapeutic decisions.

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Footnotes

  • Competing interests: None.

  • Contributors: Study design: AB, MDB, AS. Acquisition of data: BL, AB, MDB, J-MB, AS. Analysis and interpretation of data: AB, BL, AS. Manuscript preparation: AB, BL, MDB, J-MB, AS. Statistical analysis: AB, BL, AS. Club “Rhumatismes et Inflammation”: Inflammatory Joint Disease Working Group of the French Society for Rheumatology.

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