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Evaluation of three different techniques used to measure chest wall movements in children
1Portex Anaesthesia, Hospital for Sick Children, London, UK.
Insights
Comparing chest wall movement measurement devices in children reveals close agreement in ventilated patients but inconsistencies in spontaneously breathing ones. Direct comparison of data from different techniques may not always be appropriate.
Area of Science:
- Pediatric critical care medicine
- Respiratory physiology
- Biomedical engineering
Background:
- Assessing chest wall movements in children is crucial for monitoring respiratory function.
- Various devices employ different principles to measure chest wall motion.
- Evaluating the comparability of data from diverse measurement techniques is essential.
Purpose of the Study:
- To investigate the simultaneous measurement of chest wall movement in children using three distinct devices.
- To assess the agreement between inductance plethysmography, magnetometers, and a Hall device strain gauge.
- To determine if data from different chest wall measurement techniques are directly comparable in pediatric intensive care patients.
Main Methods:
- Simultaneous measurement of chest wall movement in 12 pediatric intensive care unit patients.
- Utilized inductance plethysmography (thoracic cross-sectional area), magnetometers (thoracic diameter), and a Hall device strain gauge (thoracic circumference).
- Analyzed measurements of respiratory timing and the phase angle between rib cage and abdomen.
Main Results:
- Close agreement was observed between the three devices for respiratory timing and phase angle in ventilated children.
- Occasional inconsistencies were noted when comparing devices in children who were breathing spontaneously.
- Data suggest potential discrepancies when directly comparing chest wall movement measurements from different techniques.
Conclusions:
- Direct comparison of chest wall movement data from different measurement techniques in children may not always be appropriate.
- The choice of the best measurement method can depend on the patient's clinical condition (ventilated vs. spontaneous breathing).
- Further research is needed to establish guidelines for inter-device data comparability in pediatric respiratory monitoring.
Abstract:
Several techniques exist for assessing chest wall movements in children, that incorporate different measurement principles. Although the output from such devices appears very similar, the comparability of data from different devices needs to be evaluated. We have investigated the simultaneous measurement of chest wall movement using three different devices in 12 children recovering from intensive care. The devices used were inductance plethysmography (assessing thoracic cross-sectional area), magnetometers (assessing thoracic diameter), and a Hall device strain guage (assessing thoracic circumference). Measurements of respiratory timing and of phase angle between rib cage and abdomen in these patients showed a close agreement between devices in ventilated patients. However, occasional inconsistencies occurred in patients who were breathing spontaneously. We suggest that it may not always be appropriate to directly compare data on chest wall movements in children recorded using different measurement techniques. The best method of measurement varies with the clinical picture.