22-Respiratory System-11-Feb-2019Reference Material I_Parameters of Respiration.ppt

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Parameters of Respiration
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The parameters of respiration are measurements that indicate the state of the respiratory function, including lung volumes and capacities, airway resistance, lung compliance and elasticity, and intrathoracic pressure. The volume of air that is not available for gas exchange resides in the conducting spaces. This is known as dead air and fills dead space consisting of 150 mL. The total dead space is less than 30% of the total volume. Important volumes to consider are shown in the following figure. They are for a standard 70 kg male breathing at rest.
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Lung Volumes and Capacities
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TV – The Tidal Volume – 500 mL – is the depth of breathing or the volume of gas inspired or expired during each respiratory cycle. IRV – Inspiratory reserve Volume – 3600 mL – is the maximal amount of gas that can be inspired from the end-inspiratory position (extra inspiration from the high peak tidal volume).
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