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Modeling and Evaluation of Murine Diabetic Cardiomyopathy Model
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Type 2 Diabetes and Atrial Fibrillation: Evaluating Causal and Pleiotropic Pathways Using Mendelian Randomization
Rohin K Reddy1, Maddalena Ardissino1,2, Fu Siong Ng1
1National Heart and Lung Institute, Imperial College London London United Kingdom.
Journal of the American Heart Association
|August 23, 2023
Summary
Type 2 diabetes (T2D) likely causally increases atrial fibrillation (AF) risk. However, this association is mediated by systolic blood pressure, suggesting blood pressure management is key for AF prevention in T2D patients.
Area of Science:
- Cardiovascular Genetics
- Metabolic Diseases
- Epidemiology
Background:
- Observational studies link type 2 diabetes (T2D) and atrial fibrillation (AF), but causal evidence is lacking.
- Cardiometabolic risk factors may confound the T2D-AF relationship.
Purpose of the Study:
- To investigate the causal effect of genetically predicted T2D on AF risk using Mendelian randomization (MR).
- To assess the role of cardiometabolic factors (LDL-C, BMI, SBP) in mediating the T2D-AF association.
Main Methods:
- Utilized 182 single nucleotide polymorphisms associated with T2D as instrumental variables.
- Employed two-sample, inverse-variance weighted MR for primary analysis.
- Applied MR-TRYX and multivariable MR to explore pleiotropy and mediation by cardiometabolic exposures.
Main Results:
- Genetically predicted T2D showed a causal association with increased AF liability (OR, 1.08).
- Sensitivity analyses confirmed the association after accounting for potential pleiotropy.
- The T2D-AF link became nonsignificant after adjusting for systolic blood pressure (OR, 1.04), indicating mediation.
Conclusions:
- Provides genetic evidence supporting a causal link between T2D and AF.
- Systolic blood pressure significantly mediates the causal effect of T2D on AF.
- Managing systolic blood pressure alongside glycemic control may reduce AF risk in T2D patients.
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