Nailfold capillaroscopy alterations in androgenetic alopecia: A cross-sectional study.

Background Androgenetic alopecia is considered to be an independent predictor of mortality from diabetes mellitus and heart disease. However, whether androgenetic alopecia causes changes in microcirculation is unknown. Objective The objective of the study was to investigate whether alterations in nailfold capillaries occur in androgenetic alopecia patients. Methods The nailfold capillaroscopy images of androgenetic alopecia patients and matched controls were collected and analyzed. Results The frequencies of avascular areas, dilated, bushy and bizarre capillaries and capillary disorganization, nailfold capillaroscopy scores of 2 or scores both 2 and 3 were significantly higher in the androgenetic alopecia group than in the healthy controls (9.0% vs. 0%, 57.7% vs. 19.2%, 3.8% vs. 0%, 2.8% vs. 1.3%, 3.8% vs. 0%, 38.5% vs. 12.8% and 39.7% vs. 12.8%, respectively). Limitations The results of this study may be biased on account of the limited sample size or the presence of an undiagnosed disease in participants which could alter the nailfold capillaries. Conclusion Bushy, bizarre and dilated capillaries, capillary disorganization, avascular areas and nailfold capillaroscopy scores of 2 or 2 and 3 were more common in androgenetic alopecia patients than in healthy controls. These findings indicate that abnormalities in microcirculation may be involved in androgenetic alopecia.