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Assessment of Vascular Function in Patients With Chronic Kidney Disease
Published on: June 16, 2014
Myocardial fibrosis and tissue alterations predict cardiovascular outcomes in chronic kidney disease-a prospective
Georgios Vavilis1,2, Yeshe M Kway1, Zahra Raisi-Estabragh3,4
1Division of Cardiovascular Medicine, Radcliffe Department of Medicine, Oxford Centre for Clinical Magnetic Resonance Research, University of Oxford, Oxford, United Kingdom.
Insights
Elevated native myocardial T1, a marker of fibrosis, predicts cardiovascular death, heart failure, and atrial fibrillation in chronic kidney disease (CKD) patients. This study highlights T1-mapping
Area of Science:
- Cardiovascular Imaging
- Nephrology
- Biomarkers
Background:
- Myocardial fibrosis is a significant feature of chronic kidney disease (CKD), contributing to its high cardiovascular burden.
- Cardiovascular magnetic resonance (CMR) T1-mapping offers non-invasive quantification of diffuse myocardial fibrosis.
- The prognostic significance of CMR T1-mapping in CKD populations requires further investigation.
Purpose of the Study:
- To assess the association between native myocardial T1 values and mortality and incident cardiovascular outcomes in CKD patients.
- To utilize a virtual twin-matching framework for enhanced comparability between CKD cases and controls.
- To investigate the prognostic value of myocardial T1 in a UK Biobank imaging cohort.
Main Methods:
- A 1:1 virtual twin-matched case-cohort study comparing CKD patients with phenotypically matched non-CKD controls.
- Matching criteria included demographics, comorbidities, socioeconomic status, and cardiovascular risk factors.
- Paired analyses compared myocardial T1, and Cox models evaluated the impact of a 1-SD T1 increase on outcomes over 4.9 years.
Main Results:
- CKD participants exhibited trend-level higher myocardial T1 values compared to controls (p=0.063).
- CKD patients had significantly higher cumulative incidences of all-cause mortality (11.3 vs. 3.8 per 1000 person-years; p=0.049) and heart failure (12.7 vs. 3.9 per 1000 person-years; p=0.021).
- In CKD, a 1-SD increase in T1 was linked to higher risks of cardiovascular death (HR: 3.86), heart failure (HR: 2.00), and atrial fibrillation (HR: 2.04).
Conclusions:
- Elevated native myocardial T1 is independently associated with increased risks of cardiovascular death, heart failure, and atrial fibrillation in CKD.
- The virtual twin-matching framework enhances cohort comparability and internal validity for mechanistic inference.
- Precision-matched cohort designs show promise for risk stratification in multimorbid populations.
Background:
Myocardial fibrosis is a key feature of chronic kidney disease (CKD) and may contribute to its disproportionate cardiovascular (CV) burden. Cardiovascular magnetic resonance (CMR) T1-mapping quantifies diffuse fibrosis non-invasively, but its prognostic value in CKD remains uncertain.
Aims:
To investigate associations between native myocardial T1, mortality and incident CV outcomes, in CKD using a virtual twin-matching framework within the UK Biobank imaging cohort.
Methods:
We conducted a 1:1 virtual twin-matched case-cohort study of CKD cases and phenotypically matched non-CKD controls based on demographics, comorbidities, socioeconomic status, and cardiovascular risk factors. Paired analyses compared myocardial T1 between groups, and stratified Cox models estimated the effect of a 1-SD T1 increase on incident outcomes over a median follow-up of 4.9 years.
Results:
Among 193 matched pairs (median age 68 years; 57.5% women), CKD participants had trend-level higher myocardial T1 values than controls (p = 0.063), with greater differences among those experiencing adverse outcomes. Over follow-up, CKD participants had higher cumulative incidences of all-cause mortality (11.3 vs. 3.8 events/1,000 person-years; p = 0.049) and heart failure (12.7 vs. 3.9 events/1,000 person-years; p = 0.021). In CKD, each 1-SD increase in T1 was associated with higher risks of cardiovascular death (HR: 3.86; 95% CI: 1.62, 9.18), heart failure (HR: 2.00; 95% CI: 1.27, 3.15), and atrial fibrillation (HR: 2.04; 95% CI: 1.01, 4.12), but not all-cause mortality or myocardial infarction. No significant associations were observed in matched non-CKD controls.
Conclusions:
Elevated native myocardial T1 was independently associated with CV death, heart failure, and atrial fibrillation in CKD. Virtual twin-matching framework improved comparability and internal validity in matched pairs supporting the precision-matched cohort designs for mechanistic inference and risk stratification in multimorbid populations.
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