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Respiratory Part 4

What does measuring FRC require? The use of a special method such as He-dilution or N2 washout technique
Describe FRC in people with fibrosis Highly elastic lungs, FRC is decreased, sunken chest
FRC in people with emphysema Lost elasticity, FRC is increased, barrel chest, diaphragm is flattened. Accessory muscles such as pectoralis and sternocleidomastoid is sued to aid in inspiration.
Lungs only side of Volume vs. Airway Pressure diagram Index of elasticity of lung. Open chest, lung collapse, intubate lungs and blow up to reinflate
Chest only side of Volume vs. Airway Pressure diagram Open chest, collapse lungs, remove lungs, chest sewn back, large chest without lungs, intubate and take air out of thorax. Index of elasticity of the chest.
How do you determine the FRC on the Volume vs. Airway Pressure diagram? Where the 2 lines are equally distant from the 0 line
Forced Vital Capacity Timing how much air you can exhale in a certain amount of time
What is the volume of air exhaled in the first second called in the FVC? Forced expiratory volume 1sec
What should the FEV1sec/FVC equal? 80%. If less than 80% then there is obstructive lung disease. If more than 80% there is restrictive lung disease.
What do you have an increase in obstructive lung disease? Increase in resistance
What do you have an increase in restrictive lung disease? Increase in elasticity
What are you testing during a forced expiration? Testing the compressibility of airways



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