Peripheral arterial disease (PAD) is associated with inereased risk of cardiovascular and eerebrovaseular diseases. Inereasing age, smoking, hyperlipidaemia, diabetes, hypertension, and male gender have been identified as risk factors for PAD (1). The possible role of dermatologieal diseases in the early detection of PAD remains unknown.Onyehomyeosis (OM) is a common disease, aeeounting for up to half of all reported nail diseases, with an estimated prevalence of 10% in the general population (2-4). Previous studies found that OM was assoeiated with inereasing age, gender, diabetes, psoriasis, smoking and immune dysfunction (5-7). Meanwhile, a study of patients attending a vascular clinic reported that PAD might be an independent predictor of OM (7).Based on these results, we hypothesized that OM might represent an independent elinieal sign for the early deteetion of PAD. A university-based eross-seetional study of elderly dermatologieal patients with or without microscopically eonfirmed OM was performed to clarify the role of OM as an independent predictor of PAD.
MATERIAES AND METHODSPatients aged > 50 years old who visited the outpatient or inpatient dermatology clinic of Kobe University Hospitalwere randomly enrolled in this study. This study was approved by the institutional review board. Oral and written informed consents for the study were obtained from all subjects. Both feet were examined clinically in all patients. Nail specimens from patients with clinical dystrophy of atiy toenails were examined by potassium hydroxide microscopy to detect the presence of fiingal filaments. The nail specimens were also cultured in Sabouraud dextrose agar slants with ehloramphenicol (Nikken bio medical laboratory, Kyoto, Japan).Participants completed questionnaires about age, gender, hypertension, hyperlipidaemia, smoking, diabetes, and eardiovaseular and eerebrovaseular diseases.The ankle brachial pressure index (ABI) was measured in both legs. Patients with an ABI <0.9 (8) in at least one side of the leg were considered to have PAD. The mean ABI value for both legs was calculated in the OM and control groups.All analyses were performed using SPSS 16.0 (SPSS Inc, Chicago, IL, USA). Adjusted odds ratios (ORs) and 95% confidence intervals (CI) were estimated by logistic regression models to investigate independent associations between risk factors (age, gender, hypertension, hyperlipidaemia, smoking, diabetes, cardiovascular disease, eerebrovaseular disease, and PAD) and OM. Student's /-test and Pearson's x' test were used to compare differences in continuous and categorical variables between the OM and control groups. Two-sided probability values <0.05 were considered significant. Continuous variables are presented as means ± standard deviation (SD).
RESUETSA total of 86 subjects partieipated in the study, 40 men and 46 women, with a mean age of 71.2 years. There were 44 patients in the OM group (found to be positive by mieroseopy) and 42 patients in the eontrol group (without OM). Trichophyton rubrum accounted for 68% ...