Atherogenic index of plasma predicts cerebrovascular accident occurrence in antineutrophil cytoplasmic antibody-associated vasculitis
Abstract Background: We investigated whether the atherogenic index of plasma (AIP) at diagnosis can predict cerebrovascular accident (CVA) and cardiovascular disease during follow-up in patients with antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (AAV). Methods: The medical records of 167 immunosuppressive drug-naïve AAV patients and those of 300 age- and gender-matched controls were retrospectively reviewed. AIP was calculated using the following equation: AIP = Log (triglyceride (mmol/L) / high-density-cholesterol (mmol/L)). AAV patients were divided into two groups according to their AIP, AAV patients with AIP < 0.11 (N=115) and AAV patients with AIP ≥ 0.11 (N=52). Results: The median age and body mass index of AAV patients were 59.0 years and 22.1 kg/m2, respectively. The median calculated AIP of patients was 0.01 and AAV patients with AIP < 0.11 exhibited a lower Birmingham vasculitis activity score than those with AIP ≥ 0.11 but it was not significant (P = 0.064). AAV patients had a significantly lower body mass index than controls, nevertheless, AAV patients had a significantly higher AIP than controls (0.01 vs. -0.12). Sixteen patients were diagnosed with CVA, and AAV patients with AIP ≥ 0.11 had a significantly lower CVA-free survival rate than those with AIP < 0.11. Multivariable analysis indicated that AIP ≥ 0.11 at diagnosis was significantly associated with CVA during follow-up. Conclusions: AIP was significantly higher in AAV patients than in controls. Furthermore, AIP at diagnosis could predict CVA occurrence during follow-up in AAV patients.