Abstract 256: Active Compression Decompression CPR With 5 Centimeters Lift and an Impedance Threshold Device Significantly Improves All Markers of Cerebral and Cardiovascular Hemodynamics and Blood Flow After 8 Minutes of Standard CPR
Bibliographic record
Abstract
Introduction: Active compression decompression (ACD) CPR performed along with the use of an impedance threshold device (ITD) has been shown to improve cerebral and coronary hemodynamics compared to standard CPR (SCPR). In this study, we demonstrate that ACD+ITD provides significant benefits even when initiated after 8 minutes of SCPR as measured by cerebral and cardiovascular perfusion pressures, cerebral oximetry, and blood flow as determined by neutron-activated microsphere analysis. Methods: Ventricular fibrillation was induced in 10 female Yorkshire farm pigs (40.6 ± 0.7 kg) and left untreated for 6 minutes. All animals then received 8 minutes of SCPR, followed by ACD+ITD for an additional 6 minutes. CPR was performed at a rate of 100 compressions/minute at a depth of 20% (~ 5 cm) of anteroposterior chest height. During ACD there was also an active lift component of 5cm beyond resting chest position. Microspheres were injected 4 minutes after starting SCPR and 2 minutes after starting ACD+ITD. Millar catheters were placed to measure right atrial, aortic, and intracranial pressures and NIRS was used to assess regional cerebral oxygenation. 3 minute averages obtained prior to the end of each intervention were compared with Student’s t-test and reported as mean ± SEM. Results: Mean coronary perfusion pressure and cerebral perfusion pressures were significantly improved during ACD+ITD (p<0.002, Fig 1). ACD+ITD also resulted in a 7% increase in cerebral oxygenation (47 ± 2 vs 50 ± 2%, p<0.001), a 30% increase in cerebral blood flow (0.3 ± 0.1 vs 0.4 ± 0.1ml/min/gm, p<0.004), and a 30% improvement in coronary blood flow (0.6 ± 0.1 vs. 0.9 ± 0.1ml/min/gm, p<0.004). Conclusion: This study reveals the significant benefit of ACD+ITD as measured by currently available invasive and non-invasive blood flow measurements following 8 minutes of SCPR. Initiating ACD+ITD earlier can only result in further improvement of these parameters and offer a higher likelihood of survival.
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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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".