Where is end expiration? Measuring PAWP when the patient is on pressure support ventilation.
Bibliographic record
Abstract
BACKGROUND: The hemodynamic information obtained from the pulmonary artery catheter provides physiologic rationale for a selected therapy and allows rapid determination of patients' response to the therapy. A wide range of pressure support levels have been used in pressure support ventilation (PSV), and patients' breathing patterns change from a spontaneous breathing pattern with low levels of PSV to a pressure control pattern with high levels of PSV. Different levels of pressure support have different effects on intrathoracic pressure. Changes in intrathoracic pressure may change the respiratory pattern and affect the timing for measuring the pulmonary artery wedge pressure. PURPOSE: The purpose of this study was to identify the pressure support level at which a patient's breathing pattern switches from a pressure control pattern to a spontaneous breathing pattern. SAMPLE: Fourteen patients admitted to the cardiovascular surgery ICU between January 2001 and December 2001 agreed to participate in the study. Four patients' data were not useable. Ten patients' data were analyzed. In this group, nine patients were male and one female. Patients'ages ranged, from 45 to 87-years-old with a mean age of 66.7 years. One patient had a left ventricular aneurysm repair, four patients had aortic valve repair and five patients had aortic coronary bypass performed. METHOD: This study was an exploratory descriptive study. Simultaneous pressure tracings of the pulmonary artery wedge pressure (PAWP) and proximal airway pressure were recorded during the weaning of pressure support at 2 cm H2O intervals from 18 cm H2O to below 10 cm H2O. End expiration was identified by using the proximal airway pressure when measuring the PAWP. Simultaneous pressure tracings of the PAWP and proximal airway pressure were used to analyze changes in respiratory patterns at different pressure levels during weaning of PSV. FINDINGS: One patient's breathing pattern switched into the spontaneous pattern at PSV 16 cm H2O, one at 14 cm H2O, and the rest of the patients at 12 cm H2O. CONCLUSION: Different levels of pressure support have various impacts on the intrathoracic pressure and alter the respiratory pattern. Using the proximal airway pressure, nurses can identify the location of end-expiration and measure the PAWP accurately.
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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 | 0.004 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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".