Investigating Chamber-Dependent Cardiac Remodelling in a Murine Model of Heart Failure with Preserved Ejection Fraction
Bibliographic record
Abstract
Heart failure with preserved ejection fraction (HFpEF) is strongly associated with atrial fibrillation (AF), yet chamber-specific mechanisms remain poorly defined. This thesis characterizes a HFpEF model using high-fat diet, sucrose, and L-NAME (HFDLS), a combination that has not been explored in the CD1 mouse strain. Relative to normal-diet controls, HFDLS mice showed greater percent body-weight gain (45.9 to 70.8%), reduced exercise tolerance (408 to 276 m), and elevated mean arterial pressure (84.7 to 107.6 mmHg). Invasive hemodynamics demonstrated increased LV end-diastolic pressure (6.7 to 11.8 mmHg), consistent with impaired diastolic filling. Echocardiography confirmed preserved ejection fraction with concentric remodeling. Histological analysis revealed increased fibrosis in the left atrium (5.96 to 12.15%) and left ventricle (1.71 to 3.76%). Intracardiac electrophysiology showed significantly prolonged atrial arrhythmia duration (2.6 to 23.6 s), with unchanged ventricular refractoriness. F4/80⁺ immunostaining demonstrated increased macrophage density in both chambers. Overall, the model produced a modest HFpEF phenotype that will require further refinement to strengthen disease severity, but it nevertheless revealed clear atrial-dominant structural and electrical remodeling, establishing a platform to investigate TNFαmediated mechanisms linking HFpEF and AF. Keywords: Heart Failure with Preserved Ejection Fraction, Atrial Fibrillation, CD1 mouse strain, High-Fat diet+L-NAME+Sucrose
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.004 | 0.003 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".