The risk of venous thromboembolism in atopic dermatitis: a matched cohort analysis in UK primary care

Author:

Warren Richard B12ORCID,Basey Victoria3,Lynam Anita4,Curtis Charlotte4,Ardern-Jones Michael R56ORCID

Affiliation:

1. Dermatology Centre, Northern Care Alliance NHS Foundation Trust , Salford Royal, Salford , UK

2. NIHR Manchester Biomedical Research Centre, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre , Manchester , UK

3. Pfizer Ltd , Walton Oaks, Walton on the Hill, Tadworth , UK

4. Momentum Data Ltd , St Albans, Herts , UK

5. Clinical Experimental Sciences, Faculty of Medicine, University of Southampton , Southampton , UK

6. Department of Dermatology, University Hospitals Southampton NHS Trust , Southampton , UK

Abstract

Abstract Background Atopic dermatitis (AD) is a common chronic inflammatory skin condition. While other chronic inflammatory conditions are associated with increased risk of venous thromboembolism (VTE), associations between AD and VTE have not been established. Objectives We examined whether AD is associated with an increased risk of VTE in a population-based study. Methods Electronic health records were extracted from UK general practices contributing to the Optimum Patient Care Research Database (1 January 2010 to 1 January 2020). All adults with AD were identified (n = 150 975) and age- and sex-matched with unaffected controls (n = 603 770). The risk of VTE, consisting of pulmonary embolism (PE) or deep-vein thrombosis (DVT), was compared in people with AD vs. controls using Cox proportional hazard models. PE and DVT were examined separately as secondary outcomes. Results We identified 150 975 adults with active AD and matched them with 603 770 unaffected controls. During the study, 2576 of those with active AD and 7563 of the matched controls developed VTE. Individuals with AD had a higher risk of VTE than controls [adjusted hazard ratio (aHR) 1.17, 95% confidence interval (CI) 1.12–1.22]. When assessing VTE components, AD was associated with a higher risk of DVT (aHR 1.30, 95% CI 1.23–1.37) but not PE (aHR 0.94, 95% CI 0.87–1.02). The VTE risk was greater in older people with AD (≥ 65 years: aHR 1.22, 95% CI 1.15–1.29; 45–65 years: aHR 1.15, 95% CI 1.05–1.26; < 45 years: aHR 1.07, 95% CI 0.97–1.19) and those with obesity [body mass index (BMI) ≥ 30: aHR 1.25, 95% CI 1.12–1.39; BMI < 30: aHR 1.08, 95% CI 1.01–1.15). Risk was broadly consistent across mild, moderate or severe AD. Conclusions AD is associated with a small increase in risk of VTE and DVT, with no increase in risk of PE. The magnitude of this risk increase is modest in younger people, and those without obesity.

Funder

Pfizer

Momentum Data

Pfizer UK

Publisher

Oxford University Press (OUP)

Subject

Dermatology

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