Autoimmune blistering disorders and cardiovascular risks: A population-based cohort study

Background: Autoimmune blistering disorders (ABDs) might elevate cardiovascular risk, but studies are lacking. Objective: The objective of this study was to examine if ABDs elevate the risk of atherosclerotic cardiovascular disease, heart failure, arrhythmia, venous thromboembolism, and cardiovascular death. Methods: A population-based cohort of Danish patients with ABD (≥18 years of age) diagnosed during 1996–2021 (n = 3322) was compared with an age- and sex-matched comparison cohort from the general population (n = 33,195). Results: Compared with the general population, patients with ABDs had higher 1-year risks of atherosclerotic cardiovascular disease (3.4% vs 1.6%), heart failure (1.9% vs 0.7%), arrhythmia (3.8% vs 1.3%), venous thromboembolism (1.9% vs 0.3%), and cardiovascular death (3.3% vs 0.9%). The elevated risk persisted after 10 years for all outcomes but arrhythmia. The hazard ratios associating ABDs with the outcomes during the entire follow-up were 1.24 (1.09-1.40) for atherosclerotic cardiovascular disease, 1.48 (1.24-1.77) for heart failure, 1.16 (1.02-1.32) for arrhythmia, 1.87 (1.50-2.34) for venous thromboembolism, and 2.01 (1.76-2.29) for cardiovascular death. The elevated cardiovascular risk was observed for both pemphigus and pemphigoid. Limitations: Our findings might only generalize to patients with ABDs without prevalent cardiovascular diseases. Conclusion: Patients with ABDs had an elevated cardiovascular risk compared with age- and sex-matched controls.