CeVOX for continuous central venous oxygenation measurement in patients undergoing off-pump coronary artery bypass grafting
Bibliographic record
Abstract
The aim of this study was to compare central venous O 2 saturation (ScvO 2 ) [ 1 ] measured continuously by the CeVOX (Pulsion Medical System, Munich, Germany) device (CScvO 2 ) with ScvO 2 determined by blood gas co-oximetry (BScvO 2 ) Twenty-five patients undergoing elective off-pump coronary artery bypass grafting were studied during operation (OP) and during their ICU stay (ICU). OP/ICU measurement started after in vivo calibration of CeVOX. BScvO 2 and CScvO 2 readings were recorded at intervals of 30 minutes during OP and 120 minutes during ICU. Bland–Altman analysis and Pearson correlation was performed for overall OP, overall ICU, consecutive measurements during OP ≤ 1 hour, 1–2 hours and 2–3 hours after initial calibration (OP1–OP3, respectively) as well as during ICU ≤ 4 hours, 4–8 hours, 8–12 hours and 12–16 hours after recalibration (ICU1–ICU4, respectively). Five hundred and nine matched sets of data were obtained; the BScvO 2 /CScvO 2 range was 36–98.9%/46.5–99.0%, respectively. Overall mean bias ± 2SD was -1.2 ± 13.8% for CScvO 2 –BScvO 2 during OP and -2.6 ± 16.2% during ICU. The correlation coefficient ( r ) for CScvO 2 vs BScvO 2 was 0.614 (OP) and 0.174 (ICU). Statistics for OP1–OP3 were comparable, whereas mean bias ± 2SD increased and r decreased during ICU1–ICU4 (Table 1 ). The results indicate that ScvO 2 can be reliably assessed by CeVOX. In order to maintain accurate measurements, scheduled re-calibrations at intervals <12 hours are mandatory.
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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 | 0.006 |
| 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 | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".