The balloon impasse sign in percutaneous transvenous mitral valvuloplasty
Bibliographic record
Abstract
Percutaneous transvenous mitral valvuloplasty (PTMV) is an established therapy for rheumatic mitral stenosis (MS). While the Wilkins score standardizes the description of valve anatomy and predicts successful PTMV, echocardiographic assessment has some limitations. The 'balloon impasse' sign is the inability to cross a stenotic valve with a deflated Inoue balloon. This sign was described in the 1990s as an indicator of severe subvalvular thickening (regardless of the echocardiographic findings), portending an increased risk of severe mitral regurgitation (MR) post-PTMV. Despite its implications for management, it has been seldom reported. A 57-year-old woman with symptomatic, severe MS and a Wilkins score of 7 underwent PTMV. The 'balloon impasse' sign was observed when attempting to cross the stenotic valve. When the balloon was fully inflated, severe MR was noted, and the patient required mitral valve replacement. This case demonstrates the continued importance of the 'balloon impasse' sign and its implications for the therapeutic efficacy of PTMV.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| 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 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".