AB1071 Simplified assessment in nailfold capillaroscopy in rheumatology
Authors: V Durigan, G Calizaya, A Secco, FE Romanini, ML Sormani de Fonseca, V Ortiz, M Uemura, L Takashima, M Mamani
Journal: Annals of the Rheumatic Diseases (2017)

<h3>Background</h3> Nailfold Capillaroscopy is a non-invasive diagnostic technique designed to evaluate small vessels of the microcirculation. The most important indication for capillaroscopy is Raynaud9s phenomenon. The complexity and meticulous evaluation of the eight fingers is difficult to apply in daily practice given the limited availability of time to perform. For this reason it is necessary to develop simple and abbreviated techniques, to achieve an optimal and rapid evaluation of the patient. <h3>Objectives</h3> Determine the performance of the method of the 4° finger for the diagnosis of SD pattern in patients with Raynaud9s Phenomenon taking the eight finger pattern as a gold standard. <h3>Methods</h3> Cross-sectional study with blinded and independent measurements. Nailfold Capillaroscopy was performed on the four fingers of each hand, except thumbs. Another observer evaluated the 4th finger of the hands. The interobserver agreement was made before carrying out the study and was 100%. The 8-finger method (gold standard) was considered positive when at least one finger has SD pattern and the 4° finger method was considered positive when at least one of them presents the SD pattern. We included patients older than 18 years with a diagnosis of Raynaud Phenomenon. Patients with thickening of the skin in the nailfold, digital lesion that made it difficult to assess (trauma, amputation, burns, etc.) and patients who did not consent to the procedure were excluded. <h3>Results</h3> We included 78 patients, 90% was female. The mean age was 53 years (DS +/- 13.5). Sixty-three patients had a score of eight fingers positive (cases) and 15 had a score of eight fingers negative (controls). The sensitivity of the 4° finger evaluation method was 89% (95% CI: 82–96%) and 93% specificity (95% CI: 88–99%). The positive predictive value of this method was 98% (95% CI: 95–100%) and the negative predictive value was 67% (95% CI: 56–77%). The positive likelihood ratio was 13 (95% CI: 2–89). <h3>Conclusions</h3> The simplified method of the 4° finger showed good performance for the diagnosis of SD pattern compared to the standard method of evaluation of the 8 fingers. <h3>References</h3> Sormani de Fonseca ML. Manual de Capilaroscopía. Buenos Aires: McDowell, 2000. Capítulo 1: 35. Cutolo M, Sulli A, Pizzorni C, Accordo S. Nailfold videocapillaroscopic assessment of microvascular damage in systemic sclerosis. J Rheumatol 2000; 27: 155–60. M. Cutolo et al. Nailfold videocapillaroscopic patterns and serum autoantibodies in systemic sclerosis. Rheumatology 2004; 43: 719–726. Ariane L. Herrick, Maurizio Cutolo. Clinical Implications From Capillaroscopic Analysis in Patients With Raynaud9s Phenomenon and Systemic Sclerosis. Arthritis And Rheumatism 2010. Vol 62, No 9: 2595–2604. Sonsoles Piera –Velázquez et al. Patogénesis de la Esclerosis Sistémica. Rev Peruana de Reumatología 2004; 10(3): 34–42. <h3>Disclosure of Interest</h3> None declared