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What is the difference between vital capacity forced vital capacity?
What is the difference between vital capacity forced vital capacity?
The only thing that I can think of, besides what Phloston has said, is generally FVC is a little less than true VC. This is because during forced expiration the enormous positive pressure inside the chest compresses the bronchioles a little, leading to less than absolute maximum expulsion of air.
so on the step exam can we consider them as the same value? 4.8 liters is the volume of VC is 4.8 liters also the volume of FVC?
Are you sure about that? Although, yes, you'd be increasing intrathoracic and -abdominal pressure during FVC, I wouldn't think the pressures are great enough to induce early-dynamic small airway closure. I would think that's only in pathologic states.