Effects of simvastatin on the development of the atrial fibrillation substrate in dogs with congestive heart failure☆
Why this work is in the frame
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Bibliographic record
Abstract
BACKGROUND: Congestive heart failure (CHF) is a common cause of atrial fibrillation (AF). Oxidative stress and inflammation (profibrotic) and peroxisome proliferator-activated receptor-alpha (PPAR-alpha, antifibrotic) factors may be involved in CHF-related remodeling. We evaluated the effects of simvastatin (antioxidant, anti-inflammatory) and fenofibrate (PPAR-alpha activator) on CHF-related atrial remodeling. METHODS AND RESULTS: Dogs were subjected to 2-week ventricular tachypacing (VTP) in the absence and presence of simvastatin (20 or 80 mg/day) or fenofibrate. Induced AF duration (DAF) was increased by VTP from 36+/-14 (non-paced controls) to 1005+/-257 s (p<0.01). Simvastatin prevented VTP-induced DAF increases (147+/-37 and 84+/-37 s at 20 and 80 mg/day, respectively), but fenofibrate did not (1018+/-352 s). Simvastatin also attenuated CHF-induced conduction abnormalities (heterogeneity-index reduced from 1.5+/-0.1 to 1.1+/-0.1 and 1.0+/-0.1 at 20 and 80 mg/day, p<0.01) and atrial fibrosis (from 19.4+/-1.3% to 10.8+/-0.8% and 9.9+/-0.8% at 20 and 80 mg/day, p<0.01), while fenofibrate did not. Simvastatin (but not fenofibrate) also attenuated VTP-induced left-ventricular nitric-oxide synthase and nitrotyrosine increases, along with hemodynamic dysfunction. Atrial fibroblast proliferation increased with 24-h fetal bovine serum (FBS) stimulation from 654+/-153 to 7264+/-1636 DPM (p<0.001). Simvastatin, but not fenofibrate, suppressed fibroblast proliferation (664+/-192 DPM, p<0.001). Simvastatin also significantly attenuated transforming growth factor-beta1-stimulated alpha-smooth muscle actin (alpha-SMA) expression (indicating myofibroblast differentiation) from 1.3+/-0.1 to 1.0+/-0.1 times baseline (p<0.05). CONCLUSIONS: CHF-induced atrial structural remodeling and AF promotion are attenuated by simvastatin, but not fenofibrate. Statin-induced inhibition of profibrotic atrial fibroblast responses and attenuation of left-ventricular dysfunction may contribute to preventing the CHF-induced fibrotic AF substrate.
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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 | 0.007 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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 it