Nailfold capillaroscopy as a prognostic marker for connective tissue diseases: An observational clinico-epidemiological study.

Abstract

Background Nailfold capillaroscopy (NFC) is useful in the diagnosis and assessment of various connective tissue diseases. In this study, NFC findings were studied in patients of systemic sclerosis (SS), systemic lupus erythematosus (SLE) and dermatomyositis. Aims To study the nailfold capillaroscopic findings in patients with connective tissue disorders, their correlation with disease severity, and changes in findings following treatment or disease progression. Methods This observational prospective time-bound clinico-epidemiological study was conducted in 43 patients over 20 months at Topiwala National Medical College and BYL Nair Ch. Hospital, Mumbai. NFC was performed using the polarising mode of a USB 2.0 video-dermatoscope in all 10 fingernails at 50X and 200X. It was repeated at three follow-up visits to look for changes in findings. Results Among SLE patients, eleven (52.4%) had non-specific NFC patterns and eight (38.1%) had SLE patterns. Among systemic sclerosis patients, eight (42.1%) cases had active and late SS patterns respectively, while one (5.3%) each had SLE, non-specific and early SS patterns. After three follow-ups, 10 out of 11 (90.9%) cases with improvement in NFC also showed clinical improvement; this figure was significantly more than 11 out of 23 (47.8%) cases who had no change in NFC but showed clinical improvement. Two of the three dermatomyositis patients showed a non-specific pattern while one showed a late SS pattern at baseline. Limitations A larger sample size would have yielded results with more validity. Standardisation of the interval between baseline and last follow-up to equal to or more than six months would have yielded results with more accuracy. Conclusion Capillary findings change significantly over time and reflect changes in the clinical status of patients of both SLE and systemic sclerosis, and hence are an important prognostic marker. Rather than an overt change in NFC pattern, reduction or increase in abnormal capillaries is a better predictor of change in disease activity.