Sponyloarthritis features forecasting the presence of @entity1530 or @entity6592 on magnetic resonance imaging in XXXX with suspected @entity1691 : results from a cross-sectional study in the ESPeranza Cohort.

@entity1 @entity6592 @entity1530 @entity11028 @entity1596 @entity29 @entity615 @entity1691 @entity158 @entity2720
INTRODUCTION: @entity615 ( @entity615 ) is frequently the presenting symptom in @entity1 with suspected @entity1691 ( @entity1691 ). Presence of @entity6592 on magnetic-resonance-imaging (MRI) or @entity1530 adds to diagnostic certainty. However, these costly tests cannot be applied in all @entity1 with @entity615 . This study aims to investigate which @entity11028 features increase the likelihood of a positive @entity1530 or positive MRI of the @entity2720 (MRI-SI) in @entity1 with suspected @entity1691 . METHODS: Data from 665 @entity1 with @entity615 within the ESPeranza Programme were analysed. Diagnostic utility measures (LR+, LR-) for a positive MRI-SI or @entity1530 were calculated for various @entity615 (IBP), their separate items and for other @entity11028 features. RESULTS: Pretest probabilityies of a positive result was 41  % for MRI-SI and 40  % for @entity1530 . For a positive MRI-SI result the most useful IBP characteristic was alternating @entity158 (LR   +   =2.6). Among the IBP-criteria, fulfillment of the 'ASAS criteria' (LR   +   =2.1) was most contributory. Interestingly, the addition of alternating @entity158 to the Calin/ASAS-IBP criteria (LR   +   =6.0 and 5.5, respectively) or the addition of awakening at second half of night to the Calin-IBP criteria (LR   +   =5.5) increased the pre-test probability of MRI- @entity6592 from 41  % to 79-80  %. Dactylitis (LR   +   =4.1) and @entity29 ( @entity29 ) (LR   +   =6.4) increased this probability to 73  % and 81  %, respectively. To forecast @entity1530 positivity, awakening at the second half of the night, fulfillment of the ASAS-IBP definition and @entity1596 were the most useful, but only marginally predictive (LR   +   = 1.3, 1,6 and 2.6, respectively). CONCLUSIONS: If @entity1 with suspected axial @entity11028 have either 1) IBP according to Calin/ASAS definition plus alternating @entity158 , or 2) IBP according to Calin definition plus awakening at night, or 3) dactylitis or 4) @entity29 , the probability of finding a positive MRI-SI increases significantly.
