Answer: Peripheral arterial pressure wave in the presence of ventricular asystole
Bibliographic record
Abstract
What is the most probable aetiology of the radial arterial pressure tracing and peripheral saturation read, in the absence of QRS waves, depicted in Panels D/E and Supplementary material online, Video S1? Chest compressions during cardiopulmonary resuscitation Mechanical circulatory support device Atrial contraction in the presence of ventricular standstill A technical artefact Ventricular asystole is well described due to transient AV block from stimulation of vagus nerve fibres,1 as was previously described in patients during tracheal suctioning.2 This is a rate-dependent phenomenon where the conducted sinus node activation suppresses intrinsic ventricular activation at higher rates. There has not previously been a description of the haemodynamic phenomena associated with this transient ventricular asystole. Review of concomitant radial arterial line tracing and O2 saturation reading revealed pressure waves immediately after each non-conducted P-wave (in the complete absence of QRS complexes), followed by an O2 saturation wave (Figure 1, Panels D and E), that were both distinct and smaller in size, than the arterial and saturation waves caused by each QRS complex, before and after the transient AV block (Figure 1, Panel F). The arterial pressure waves recorded during ventricular asystole in this case represent ejection of blood through the aortic valve, originating from left atrial contraction3 alone, in the presence of ventricular standstill. To the best of our knowledge, this is the first description of such haemodynamic tracing, illustrating the ability of the left atrium to contract and induce modest ventricular ejection in the presence of ventricular asystole. Telemetry recordings from a mechanically ventilated patient with sudden intermittent bradycardia and transient asystole. Panel A: Bradycardia in keeping with a vagal response pattern, with sudden prolongation of P-P and R-R intervals. Panel B: Progressive atrioventricular block with no ventricular activation. Panel C: Spontaneous resolution of atrioventricular block. Panel D, E & F: Concomitant telemetry (green) radial arterial line (red) and O2 saturation (blue) tracing during ventricular asystole and recovery. Supplementary material is available at European Heart Journal: Acute Cardiovascular Care. D.H.B. is supported by a research grant from TRANSFORM HF. The data underlying this article cannot be shared due to the privacy of individual that participated in this report and the limitations of the consent provided for this publication.
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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 | 0.008 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.006 | 0.003 |
| Insufficient payload (model declined to judge) | 0.022 | 0.008 |
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".