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Work of breathing for cuffed and uncuffed pediatric endotracheal tubes in an in vitro lung model setting
Jörg Thomas1,2, Markus Weiss1,2, Vincenzo Cannizzaro2,3
1Department of Anesthesia, University Children's Hospital of Zurich, Zurich, Switzerland.
Insights
Cuffed endotracheal tubes increase work of breathing in pediatric patients, but pressure support ventilation with automatic tube compensation significantly reduces this effect. Distal airway pressures remain clinically unaffected, suggesting safe use in pediatric care.
Area of Science:
- Pediatric Anesthesia and Intensive Care
- Respiratory Mechanics
- Medical Device Engineering
Background:
- Cuffed endotracheal tubes are increasingly utilized in pediatric anesthesia and intensive care.
- Concerns exist regarding increased endotracheal tube resistance due to the smaller inner diameter of cuffed tubes.
Purpose of the Study:
- To investigate the impact of cuffed versus uncuffed endotracheal tubes on work of breathing and inspiratory airway pressures.
- To evaluate the effect of pressure support ventilation and automatic tube compensation on these parameters.
Main Methods:
- An in vitro study using 5 simulated neonatal and pediatric lung models.
- Quantified work of breathing under spontaneous breathing with and without pressure support and automatic tube compensation.
- Measured proximal and distal inspiratory airway pressures during mechanical ventilation.
Main Results:
- Work of breathing was 10.27% higher with cuffed tubes but reduced by 34.19% with pressure support.
- Automatic tube compensation minimized work of breathing differences between tube types.
- Proximal airway pressures were higher with cuffed tubes, but distal pressures showed minimal differences.
Conclusions:
- Significant differences in work of breathing and proximal pressures exist between cuffed and uncuffed endotracheal tubes.
- Pressure support ventilation with automatic tube compensation effectively neutralizes increased work of breathing.
- Distal inspiratory airway pressures are not significantly increased, indicating clinical safety.
Background:
Over the last decade, cuffed endotracheal tubes are increasingly used in pediatric anesthesia and also in pediatric intensive care. However, the smaller inner diameter of cuffed endotracheal tubes and, implicitly, the increased endotracheal tube resistance is still a matter of debate.
Aims:
This in vitro study investigated work of breathing and inspiratory airway pressures in cuffed and uncuffed endotracheal tubes and the impact of pressure support ventilation and automatic tube compensation.
Methods:
In 5 simulated neonatal and pediatric lung models, the Active Servo Lung 5000 and an intensive care ventilator were used to quantify the differences in work of breathing under spontaneous breathing (with and without pressure support ventilation and automatic tube compensation) between cuffed and uncuffed endotracheal tubes. Additionally, differences in inspiratory airway pressures, measured either proximal or distal of the endotracheal tube, between cuffed and uncuffed endotracheal tubes under mechanical ventilation were investigated.
Results:
Work of breathing was overall 10.27% [95% confidence interval 9.01-11.94] higher with cuffed than with uncuffed endotracheal tubes and was dramatically reduced by 34.19% [95% confidence interval 31.61-35.25] with the application of pressure support. Automatic tube compensation almost diminished work of breathing differences between the 2 endotracheal tube types in nearly all pediatric lung models. Peak inspiratory and mean airway pressures measured at the proximal endotracheal tube end revealed significantly higher values in cuffed than in uncuffed endotracheal tubes. However, these differences measured at the distal end of the endotracheal tube became minimal.
Conclusion:
This in vitro study confirmed significant differences in work of breathing and inspiratory pressures between cuffed and uncuffed endotracheal tubes. Work of breathing, however, is almost neutralized by pressure support ventilation with automatic tube compensation and distal inspiratory airway pressures that, from a clinical perspective, are not significantly increased.
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