Abstract
The ventilatory effects of breath-by-breath measurements of airway occlusion pressure, i.e., airway pressure determined 100 ms after initiation of inspiration (P 0. 1) were evaluated in seven lambs studied sequentially between 7 and 28 days after birth. P 0.1 was determined by computer-aided, on-line regression analysis of the inspiratory pressure versus time (dP/dt) by means of a pneumatic occlusion valve that allowed occlusion times to vary in proportion to respiratory rate. No significant changes were found in minute ventilation, tidal volume, respiratory rate or end-tidal CO2 concentration when the valve was operating as a one-way valve (opening pressure 0.02 kPa or 0.2 cm H20) compared to when in occlusion mode [opening pressure 0.18–0.2 kPa or 1.8–2.0 cmH20, mean occlusion time 44 (25) ms]. The calculated P 0.1 values correlated well with those obtained from manual occlusions (r = 0.87, P < 0.0001). This new technique, which detects and discards irregular or non-linear (r < 0.95) inspiratory pressure profiles, enables breath-by-breath determinations of inspiratory drive in rapidly breathing lambs with minimal impact on respiratory pattern and ventilation.
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These results were presented in part at the annual meetings of the American Pediatric Society and the Society for Pediatric Research 1992
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Milerad, J., Larsson, H., Lin, J. et al. Breath-by-breath determinations of airway occlusion pressure in the developing lamb. Europ. J. Appl. Physiol. 74, 44–51 (1996). https://doi.org/10.1007/BF00376493
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DOI: https://doi.org/10.1007/BF00376493