Related Experiment Videos
Causal Associations of Red Cell Distribution Width with Rheumatoid Arthritis and Congestive Heart Failure: A
Jing Lei1,2,3, Zhenqiu Liu3, Renjia Zhao3
1Department of Epidemiology, School of Public Health, Fudan University, Shanghai, 200032 China.
Phenomics (Cham, Switzerland)
|June 4, 2026
Summary
High red cell distribution width (RDW) causally impacts rheumatoid arthritis and congestive heart failure. This study used phenome-wide and genome-wide association studies with Mendelian randomization to confirm these health risks.
Area of Science:
- Genetics
- Epidemiology
- Internal Medicine
Background:
- Red cell distribution width (RDW) is linked to numerous diseases, but causal links remain unclear.
- Investigating RDW's role in disease etiology is crucial for understanding health risks.
Purpose of the Study:
- To determine the causal effects of high red cell distribution width (RDW) on various health outcomes.
- To leverage phenome-wide association study (PheWAS), genome-wide association study (GWAS), and Mendelian randomization (MR) for robust causal inference.
Main Methods:
- Utilized UK Biobank data from a white British cohort with complete baseline RDW and genetic data.
- Employed random sampling to divide subjects into PheWAS (80%) and GWAS (20%) groups.
- Conducted MR analysis to establish causal associations between RDW and disease outcomes.
Main Results:
- Phenome-wide association study identified 222 phenotypes associated with RDW.
- Genome-wide association study revealed 29 independent genetic signals linked to RDW.
- Mendelian randomization confirmed a statistically significant causal association between RDW and rheumatoid arthritis and congestive heart failure.
Conclusions:
- This study provides novel evidence supporting a causal relationship between elevated RDW and specific disease risks.
- Findings contribute to resolving the debate on RDW's association with disease pathogenesis.
- Highlights RDW as a potential indicator for rheumatoid arthritis and congestive heart failure risk.
Related Concept Videos
01:11Genome-wide Association Studies-GWAS
Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
GWAS does not require the identification of the target gene involved in...
01:23Rheumatic Heart Disease I: Introduction
Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...
01:22Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies
The key clinical manifestations of Rheumatic heart disease (RHD) include several distinct cardiac symptoms.Carditis, a hallmark of acute rheumatic fever, involves inflammation of the heart's endocardium, myocardium, and pericardium. Chronic RHD often results from recurrent episodes of carditis. Its symptoms include the following:Murmurs are caused by valvular damage, especially to the mitral and aortic valves. Mitral stenosis or regurgitation is common, with characteristic heart murmurs...
01:30Coronary Artery Disease I: Introduction
Coronary Artery Disease (CAD): An Overview with Scientific InsightsCoronary Artery Disease (CAD), often referred to as C-A-D, is a prevalent blood vessel disorder classified under the broader category of atherosclerosis. Atherosclerosis is a pathological process characterized by the hardening and narrowing of arteries due to the accumulation of atherosclerotic plaques. These plaques are composed of cholesterol, fatty substances, inflammatory cells, calcium, and fibrin, reducing blood flow to...
01:20Rheumatic Heart Disease IV: Nursing Management
AssessmentA comprehensive assessment is essential in managing a patient with rheumatic heart disease (RHD). Begin with obtaining a detailed medical history, including recent streptococcal infections, a history of rheumatic fever, or previously diagnosed rheumatic heart disease. Assess the patient for symptoms such as fever, chest pain, widespread joint pain (arthralgia), tachycardia, pericardial friction rub, muffled heart sounds, heart murmurs, peripheral edema, subcutaneous nodules, and...
01:29Cardiomyopathy IV: Restrictive Cardiomyopathy
Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...