Body surface mapping of retrograde P waves in the intact dog by simulation of accessory pathway re-entry.
Bibliographic record
Abstract
OBJECTIVES: To investigate a noninvasive technique to localize the atrial insertion site of concealed accessory pathways based on the analysis of body surface potential maps (BSPMs) of retrograde P waves in dogs with simulated retrograde pathways. ANIMALS AND METHODS: Orthodromic tachycardias were simulated by atrial stimulations at eight different sites around the atrioventricular ring with long (250 ms and 300 ms) and short (100 ms and 130 ms) coupling times in 14 anesthetized dogs to have P waves well separated from the T wave or occurring during the T wave, respectively. The distance between pacing sites was 15 to 40 mm in group 1 (eight dogs) and 2 mm (in the right atrial free wall region) in group 2 (six dogs). Beats were signal-averaged during 30 s and BSPMs were constructed from 63 unipolar leads. RESULTS: The P wave BSPM pattern for any specific stimulation site was stable and reproducible (correlation coefficient greater than 0.98), and similar in different dogs at long coupling interval stimulations. The thoracic distribution of negative potentials and position of the potential minimum clearly identified the stimulation site when long coupling time stimulations were used. The spatial resolution of the technique as determined by comparison of correlation coefficients in group 2 was 6 mm (P<0.05). When short coupling time stimulations were used (fast tachycardia simulation), the T wave masked the P wave potential distribution in four of eight dogs, but the retrograde P wave map could still be accurately extracted by subtracting a straight line joining the onset and offset of the P wave in 24 of 28 (86%) of the tachycardia simulation sites in these four dogs. CONCLUSIONS: The BSPM patterns of simulated retrograde P waves are specifically related to the site of atrial stimulation. Although the T wave altered these BSPM patterns, a subtraction technique recovered the pattern of the retrograde P wave in 93% of all simulated orthodromic tachycardias. The spatial resolution of the retrograde P wave BSPM method was 6 mm.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| 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 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".