Visibilidad del lecho capilar ungueal por capilaroscopia de acuerdo al fototipo del piel según la escala de Fitzpatrick.

Abstract

Introduction: Nailfold capillaroscopy is a diagnostic technique to assess the capillaries as study of diseases. The Fitzpatrick scale is a classification of skin phototypes based on the ease of tanning. There are no studies that analyze the possible causes of poor visibility in capillaroscopy. The Objective of the present study is to identify if there are differences in the visualization of nailfold capillaroscopy based on skin phototype. Method: Nailfold capillaroscopy was performed in the 4th and 5th finger of the non-dominant hand, to 61 volunteers of different phototypes according to the Fitzpatrick scale. 3 experts quantified the visibility of the nailfold capillaroscopy in good, fair or poor. A concordance co efficient was also made between the observers. Results: Quantification of the visibility was: photype I had a regular visibility of 100% (3); phototype II had regular visibility 80% 12), poor visibility 20% (3); phototype III had a good visibility of 40% (40), regular visibility of 47% (7), poor visibility 13% (2); phototype IV had a good visibility of 27% (4), regular visibility 33% (5), poor visibility 40% (6); phototype V had a good visibility of 20% (2) regular visibility of 50% (5), poor visibility of 30% (3); phototype VI had a regular visibility of 33% (1); poor visibility of 67% (2). Concordance coefficient between expert 1 and 2 was -0,3459, between 1 and 3 was -0,3596; and between 2 and 3 was -0,3288. Conclusion: Phototype V and VI Skin Phototype had more percentage of poor visibility of nailfold capillarscopy than other photypes. Concordance between observers was poor. Future studies will be able to determine this association more precisely. Factors that may influence the variability of discrimination of observers should be taken into account.