Relevance of Pressure Recovery in a Young Patient With Aortic Stenosis and Small-Caliber Aorta
Bibliographic record
Abstract
The case concerns a 20-year-old patient with Canadian Cardiovascular Society class II angina who was initially referred for aortic valve replacement because of a suspected high-grade aortic valve stenosis with increased transvalvular gradients (max/mean: 70/40 mm Hg) measured by Doppler echocardiography. Examinations using transesophageal echocardiography and computed tomography showed a sufficiently opening bicuspid aortic valve, excluded supra- and subvalvular stenoses, and measured a narrow aorta (diameter: 2 cm). The explanation for the highly increased gradients across the aortic valve was the pressure recovery (PR) phenomenon, which cannot be detected by Doppler gradients. Distal to a stenosis kinetic energy is converted back into potential energy, most effectively in small aortas (area: <3 cm 2 ). This reduces the actual transvalvular pressure gradient, which can directly be determined with cardiac catheterization. Accordingly, invasive measurements showed a moderate aortic stenosis (mean transvalvular pressure: 19 mm Hg), almost identical to the PR-corrected Doppler measurements. A high-grade stenosis of the proximal left anterior descending artery was treated interventionally, which could explain the angina symptoms.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.004 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.005 | 0.003 |
| Insufficient payload (model declined to judge) | 0.002 | 0.001 |
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 source (direct Gemma or distilled Codex), 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".