Long-term performance of a new catheter delivered lead
Bibliographic record
Abstract
The Medtronic 3830 lead is a 4Fr catheter-delivered bipolar, fixed screw lead that facilitates alternate right heart pacing whose short-term behavior has been characterized. Its longterm performance has not been described. This retrospective study assessed the longterm electrical performance of the lead. Implant and pre-hospital discharge [PHD], 12 and 52 weeks(wk) measurements of electrogram amplitude [EGM-mV], impedance (Imped-ohms), thresholds [V] were reviewed. 43 patients, aged 70 years (range 41–92) received 29 atrial(A) and 41 ventricular (V) leads. V implant site was apex(14), septum(25), other(2). A lead follow-up was 45±38 wks and 34±36 wks for V lead. Data are presented below(mean±D): *p≤0.01 compared to implant A and V lead impedance declined after implant A or V lead and threshold voltage rose on follow-up. There was no difference between RV apical versus non-apical implant site. The 3830 lead showed good chronic electrical performance over a year of follow-up regardless of implant site.
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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 | 0.001 | 0.003 |
| 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) | 0.001 | 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".