Airway Pressure Release Ventilation and Pulmonary Catheter Readings in Swine
Author Information
Author(s): Ahmad M. Slim, Martinho Shaun, Slim Jennifer, Davenport Eddie, Castillo-Rojas Luadino M., Shry Eric A.
Primary Institution: Brooke Army Medical Center
Hypothesis
The study aims to evaluate the relationship between pulmonary capillary wedge pressure (PCWP) and left atrial pressure (LAP) during airway pressure release ventilation (APRV) in a swine model.
Conclusion
PCWP is an accurate measurement of LAP during APRV, but both may not accurately reflect volume status when CPAP is utilized.
Supporting Evidence
- Increasing CPAP levels during APRV led to higher PCWP and LAP measurements.
- The relationship between PCWP and LAP was linear and statistically significant.
- PCWP and LAP returned to baseline values when conventional ventilation was restored.
- The study is the first to formally assess the relationship between PCWP and LAP during APRV.
Takeaway
This study looked at how a special breathing method affects pressure readings in pigs, finding that one pressure reading can help understand another during this method.
Methodology
Seven healthy swine were sedated and intubated, then assessed under conventional ventilation and APRV with varying CPAP levels while measuring hemodynamic parameters.
Potential Biases
The absence of monitoring intrathoracic pressure (ITP) may introduce bias in understanding hemodynamic changes.
Limitations
The study used healthy swine, which may not represent patients with less compliant lungs, and the maximum CPAP level tested was 35 cm H2O.
Participant Demographics
Seven male swine weighing 30–45 kg.
Statistical Information
P-Value
<0.001
Confidence Interval
95%
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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