Bibliographic record
Abstract
Introduction: Central venous catheters (CVCs) are used to administer hemodialysis (HD) therapy. The CVC tip should be positioned in a central vein, with devices tips at the atriocaval junction (upper body CVC), and in the inferior vena cava (IVC, lower body CVC) [1]. Here we describe a case of life-threatening arrhythmia associated with CVC position. Case Description: A 58-year-old female dialysis patient presented for cardiac testing for upcoming renal transplant. She was being dialyzed via a CVC due to failure of her arteriovenous fistula. Due to central venous stenosis, a 55cm tunneled right femoral CVC was placed in 2021. During her exercise stress echocardiogram, she developed ventricular arrhythmias 6.5 minutes into the test. The procedure was halted. She had 5 minutes of sustained ventricular tachycardia, with resolution of arrhythmias 8 minutes into recovery but was stable throughout. Coronary angiogram was negative. Chest x-ray demonstrated the CVC had a split-tip, both of which were in the right atrium. Cardiology determined the arrhythmia was related to irritation of the conduction system by a malpositioned CVC. The CVC was replaced with a new 31cm catheter resting in the IVC. Discussion: Arrhythmias in HD patients are often attributed to ischemia, electrolyte abnormality, or systemic stresses [2]. Here, catheter position was considered the primary trigger. Though not documented, oscillation of the lumen tips during dialysis could also have precipitated intradialytic arrhythmia. While confirmation of CVC position by chest x-ray is standard for temporary upper body devices, it should be considered for any CVC where malposition could occur (e.g. small body size).Lateral chest radiographs demonstrating deep position of CVC and split-tip catheter, respectively)
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.017 | 0.005 |
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".