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Respiratory Function (ERV (Expiratory Reserve Volume (extra volume of gas…
Respiratory Function
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PF
Peak Flow
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measures the ease with which the lungs are ventilated and reflects resistance in the large airways, expiratory muscle strength and effort.
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RV
Residual Volume
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inhaled with first breath at birth and exhaled at death, because the chest wall prevents the lungs emptying completely.
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Normal: 20-30% of TLC, average 1.2 L
Hyperinflation: approx 75% of TLC
TLC
Total Lung Capacity
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sum of 4 primary lung volumes TV, IRV, ERV, RV
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VC
Vital Capacity
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represents 3 volumes under volitional control (IRV, TV, ERV) and is useful for measuring ventilatory reserve in a co-operative patient
Indicates ability to breathe deeply and cough, reflecting inspiratory and expiratory muscle strength
sometimes reduced in obstructive disorders and always in restrictive disorders.
Subject to day to day fluctuations
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TV
Tidal volume
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reflects functions of the respiratory centres, respiratory muscles and the mechanics of lung and chest wall
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