Background: Hyperinsulinism is related to the presence of acanthosis nigricans and atherosclerosis; however, we were unable to find any study on the prevalence of atherosclerosis in acanthosis nigricans.
Aims: To evaluate the prevalence of carotid atherosclerosis and metabolic alterations in Mexican patients with acanthosis nigricans.
Methods: We carried out a cross-sectional study that included 45 patients with acanthosis nigricans, age- and gender-matched with 45 healthy participants. Volunteers with any comorbidity or taking weight reduction, glucose- and/or lipid-lowering medication or drugs capable of causing acanthosis nigricans were not included in the study. B-mode ultrasound tests were done to measure the carotid intima-media thickness. Body mass index, insulin, glucose and lipid blood serum levels were measured. Chi-square or Fisher's exact test and paired Student t-test were used for statistical analysis.
Results: Carotid intima-media thickness was greater in patients with acanthosis nigricans (mean 0.52 mm vs. 0.46 mm, P = 0.002). The prevalence of abnormal intima-media thickness was higher in patients with acanthosis nigricans versus healthy participants (62.2% vs. 35.5%, P = 0.02). The same occurred with hyperinsulinemia (73.3% vs. 13.3%, P< 0.001), insulin resistance (86.6% vs. 33.3%, P< 0.001), obesity (86.6% vs. 13.3%, P< 0.001) and dyslipidemia (95.5% vs. 77.7%, P = 0.01).
Limitations: The sample size is small and serum markers of cardiovascular risk were not measured.
Conclusion: Acanthosis nigricans is a skin marker for metabolic disturbances and is also associated with carotid atherosclerosis, a finding which is not well documented. We propose that individuals with acanthosis nigricans should be routinely evaluated for these cardiovascular risks.