Questions and Answers
What is the ratio of FEV1 to FVC in obstructive lung diseases?
1L/5L = 20%
Which lung function test is used to assess timed vital capacity?
Volume-time curve
What is the normal respiratory minute volume for males?
150L/min
Which lung function characteristic is typical of restrictive lung diseases?
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What does the flow-volume loop help differentiate between?
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Where is blood flow lowest in the lung according to the zones described?
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In which zone does blood flow show a 5-fold difference between the top and bottom of the lung?
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What happens to both airflow and blood flow as one moves down the lung?
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Where is the VA/Q ratio optimal for gas exchange?
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What characterizes the apical alveoli with regards to perfusion?
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In which zone is ventilation proportionately greater than blood flow?
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What is the volume of air that never takes part in gas exchange areas?
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In a healthy individual, what is physiological dead space approximately equal to?
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What is the formula to calculate pulmonary ventilation?
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Which type of dead space involves the volume of air in the alveoli that are nonfunctioning?
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If a patient's respiratory rate doubles, how would this affect alveolar ventilation?
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What is the significance of understanding the ventilation-perfusion ratio in different parts of the lung?
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