Enhanced Cerebral Blood Flow and Hemodynamic Status with an Alternative Left Ventricle Chest Compression Position during Cardiopulmonary Resuscitation in Swine
Bibliographic record
Abstract
Introduction The standard chest compression (SCC) position for cardiopulmonary resuscitation (CPR) is the centre of the chest and typically central to the aortic root. An alternative left ventricle chest compression (LVCC) position may facilitate superior global blood flow. We tested the hypothesis that, consistent with improved ETCO 2 (indicative of cardiac output) and blood pressure (BP), LVCC would promote greater cerebral blood flow (CBF) than SCC. Methods Female pigs (N=32; 35±2kg) were rotated systematically to receive either SCC (n=14) or LVCC (n=18). Transthoracic echocardiography was used to identify and externally mark: (1) the SCC position, the midline at the level of the aortic route, or (2) the LVCC position, the midpoint of the left ventricle. After 2 minutes of untreated asphyxiated cardiac arrest (CA), swine were treated with three 2‐minute cycles of mechanical chest compressions (LUCAS III). ETCO 2 (in‐line sampling), BP (arterial catheter line), and CBF velocity (CBF v, transcranial Doppler, primary outcome) were measured during the pre‐CA, untreated‐CA, and CPR‐treated phases. Between‐group outcomes were compared using a mixed model ANOVA with significant differences considered at P<0.05 and data are presented as mean±standard deviation. Results Pre‐ and untreated‐CA ETCO 2 , BP and CBF v were similar between the SCC and LVCC groups (P>0.100). During CPR, ETCO 2 (36±6 mmHg versus 24±10 mmHg; P<0.001), Mean Arterial Pressure (MAP; 49±9 mmHg versus 37±9 mmHg; P=0.002), and Mean CBF v (11±5 cm/s versus 5±2 cm/s; P<0.001) were significantly higher in the LVCC, versus SCC, group. Conclusion In comparison to SCC,LVCC resulted in higher ETCO 2 , MAP, and Mean CBF v values throughout CPR in a swine model of CA. New and Noteworthy We provide novel evidence that compared with mechanical compressions performed over the centre of the chest, compressions performed over the left ventricle promote greater CBF during BLS CPR. Clinical validation of these results may improve survival rates and attenuate neurological deficits following CA.
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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 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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".