Controlled Mechanical Ventilation Leads to Remodeling of the Rat Diaphragm
Bibliographic record
Abstract
Little is known about the structural response of the diaphragm to controlled mechanical ventilation. We examined effects of this intervention on muscle mass, myosin heavy chain isoforms, and contractile function in the rat diaphragm. Animals were mechanically ventilated for up to 4 days, and comparisons were made with normal control rats as well as spontaneously breathing animals anesthetized for the same duration as the mechanical ventilation group. The diaphragm-to-body weight ratio was significantly reduced in the mechanical ventilation group only. After mechanical ventilation, an increase in hybrid fibers coexpressing both type I (slow) and type II (fast) myosin isoforms was found within the diaphragm, which occurred at the expense of the pure type I fiber population. In contrast, the percentages of type I, type II, and hybrid fibers in the limb muscles (soleus and extensor digitorum longus) did not differ between experimental groups. The optimal length for force production, as well as maximal force-generating capacity of the diaphragm, was also significantly decreased in mechanically ventilated animals. We conclude that even short-term controlled mechanical ventilation produces significant remodeling and functional alterations of the diaphragm, which could impede efforts at discontinuing ventilatory support.
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| 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 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".