Related Experiment Video
Updated: Aug 9, 2026
Investigation into Deep Breathing through Measurement of Ventilatory Parameters and Observation of Breathing Patterns
Published on: September 16, 2019
Pilot study for the development of a monitoring device for ventilated children
D F Wensley1, P Noonan, M D Seear
1Department of Paediatrics, University of British Columbia, B.C. Children's Hospital, Vancouver, Canada.
Insights
This study shows that resistance and compliance loops can easily display respiratory mechanics changes in ventilated children. These visual tools help monitor patient status and lung function effectively.
Area of Science:
- Pediatric critical care medicine
- Respiratory physiology
- Medical engineering
Background:
- Mechanical ventilation is crucial for critically ill children.
- Monitoring respiratory mechanics is essential for optimizing ventilator settings.
- Current methods for assessing respiratory mechanics can be complex or invasive.
Purpose of the Study:
- To evaluate the feasibility and utility of resistance and compliance loops for monitoring respiratory mechanics in pediatric patients on mechanical ventilation.
- To assess if these visual displays can reflect changes in patient clinical status.
- To determine the ease of implementation and minimal interference with patient care.
Main Methods:
- Airway pressure and airflow were measured at the endotracheal tube in 13 children.
- Data were analyzed using computer software to generate pressure-volume, pressure-flow, and flow-volume loops.
- "Closed" loops for compliance and resistance were derived by subtracting resistive or elastic pressure components.
- Loops were superimposed over time or after interventions for visual comparison.
Main Results:
- Resistance and compliance loops effectively displayed changes in respiratory mechanics.
- A 30% change in compliance or resistance was readily observable.
- Changes in the slope of these loops correlated with alterations in the patient's clinical status.
- The method caused minimal interference with patient care.
Conclusions:
- Resistance and compliance loops offer a safe and easy method for visualizing respiratory mechanics in ventilated children.
- These visual displays have the potential to aid in real-time patient monitoring and ventilator management.
- Further research is needed to confirm the clinical utility of these displays in real-time applications.
Abstract:
Airway pressure and air flow were measured at the endotracheal tube in 13 children on a variety of ventilators. These signals were stored for analysis on a computer. Further data sets were obtained after 24 hours or following major interventions. Air flow rate was integrated to give volume. Pulmonary resistance and elastance were obtained by multiple linear regression. Pressure-volume, pressure-flow and flow-volume loops were plotted. "Closed" pressure-volume and pressure-flow loops (by subtraction of the resistive or elastic pressure components, respectively) were also displayed, giving compliance and resistance loops. The loops from the initial data set were taken as the baseline, and loops from later data sets were superimposed to provide visual comparisons. Change in clinical status was reflected by the change in slope of compliance and resistance loops. A 30% change in compliance or resistance was easily observed. There was minimal interference with patient care. This pilot study demonstrates that changes in respiratory mechanics can be displayed safely and easily in ventilated patients using resistance and compliance loops. Further work is necessary to confirm the usefulness of real time of these displays.
