[abstract] PASSIVE VENTILATION AS A TECHNIQUE FOR THE MEASUREMENT OF RESPIRATORY POWER.

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[abstract] PASSIVE VENTILATION AS A TECHNIQUE FOR THE MEASUREMENT OF RESPIRATORY POWER.

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Title: [abstract] PASSIVE VENTILATION AS A TECHNIQUE FOR THE MEASUREMENT OF RESPIRATORY POWER.
Author: Jenks, SL; Morrison, JB
Abstract: Passive ventilation was investigated as a technique for the measurement of respiratory power. Five male divers were mechanically ventilated in the wet chamber of a hyperbaric facility under five test conditions: dry at l ATA, and immersed with hydrostatic pressure compensation of breathing gas to lung centroid pressure, at 1, 2, 4, and 6 ATA pressures. Five rates of ventilation (20, 30, 40, 50, and 60 L'min-I) were applied at each test condition for a total of 125 trials. Static compliance was measured in the dry condition using standard spirometric techniques. Dynamic compliance and flow-resistive respiratory power were calculated from the data collected during passive ventilation. Data were fitted with a theoretical equation and the results compared with previous literature. The power curve at I ATA followed the trend reported by other researchers. Power values were larger at corresponding rates of ventilation than in studies reporting pulmonary flow-resistive power only. Flow-resistive respiratory power was shown to increase significantly with increases in ambient pressure, particularly at moderate to high rates of ventilation-Power at 1 ATA ranged in value from 0.3 W at 20 L'min-I to 1.7 W at 60 L'min-. At 6 ATA power ranged in value from 0.4 W at 20 L'min-l to 3.4 W at 60 L'min-l. Static and dynamic compliances were not significantly different at I ATA. with average values of 1.00 ± 0.15 SD and 0.96 ± 0.33 SD L.kPa^-1 respectively. Values of dynamic compliance were not affected by increases in ventilation or increases in gas density which agrees with results obtained in studies using non-passive measurement techniques.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Joint Annual Scientific Meeting with the International Congress for Hyperbaric Medicine and the European Undersea Biomedical Society held 11-18 August 1990. Okura Hotel, Amsterdam, The Netherlands (http://www.uhms.org)
URI: http://archive.rubicon-foundation.org/7228
Date: 1990

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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