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Published on: April 13, 2010
Respiratory drive during carbachol challenge in allergic sheep
T Strömberg1, J Adams, W Abraham
1Department of Biomedical Engineering, Linköping University, Linköping, Sweden.
Clinical Physiology (Oxford, England)
|February 13, 2001
Summary
Peak inspiratory acceleration (PIA) shows promise as a non-invasive measure of respiratory drive. This method accurately reflects respiratory system response during bronchoprovocation, potentially aiding in managing lung diseases.
Area of Science:
- Respiratory Physiology
- Pulmonary Medicine
- Biomedical Engineering
Background:
- Diaphragmatic activity is the gold standard for assessing respiratory neural output but is invasive and unsuitable for long-term monitoring.
- Non-invasive measures like minute ventilation (V') and mean inspiratory flow (VT/tI) reflect respiratory drive but have limitations.
- Previous research suggests peak inspiratory acceleration (PIA) correlates with diaphragmatic activity in piglets.
Purpose of the Study:
- To determine if tidal breathing peak inspiratory acceleration (PIA) can serve as a non-invasive indicator of respiratory drive.
- To evaluate PIA's responsiveness during a carbachol-induced bronchoprovocation challenge in allergic sheep.
Main Methods:
- Aerosolized carbachol was administered to 15 allergic sheep until pulmonary resistance increased by at least 400%.
- Minute ventilation (V') and mean inspiratory flow (VT/tI) were monitored non-invasively.
- Peak inspiratory acceleration (PIA) was measured during tidal breathing.
Main Results:
- Following carbachol challenge, V' and VT/tI showed non-significant increases (8% and 5%).
- PIA demonstrated a significant 30% increase (P<0.05) during the challenge.
- Changes in PIA strongly correlated with changes in V' (r=0.73) and VT/tI (r=0.88).
Conclusions:
- Peak inspiratory acceleration (PIA) effectively reflects respiratory drive during bronchoprovocation.
- PIA offers a potential non-invasive method for estimating respiratory drive, particularly in conditions like COPD where other measures are compromised.
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