M********r
发帖数: 179 | 1 Thanks for the previous explanations. However, in a second thought, I tend
to stick to my original answer.
My explanation to this is as following:
at FRC, the PRESSURE of inward (lung) and outward (chest wall) equals to
zero. But that doesn't mean the VOLUME is the same. In fact, because of the
recoil, the pressure of the lung is almost always positive (at FRC, pressure
of the lung=+5). On the other hand, the chest wall always springs out,
therefore the pressure is always negative (at FRC, pressure of the lung=-5).
If this is the case, then the volume should be the difference for the
number on y-axis of chest wall and lung.
Please please please correct me if I'm wrong. Any input is definitely
welcomed. | d****y
发帖数: 2180 | 2 From the figure, I think the pressure at FRC is +10 for lung and -10 for the
chest wall. | M********r
发帖数: 179 | 3 The number is not that important, my number is from either UW or Kaplan
notes as i recall. But do you think the concept is right or not? I mean
volume is not equals to pressure. | d****y
发帖数: 2180 | 4 I think the air volume is only for the lung, don't know how to calculate
the air volume in chest wall.
If the air in the lung and in the chest wall is communicating, then it's
pneumothorax.
【在 M********r 的大作中提到】
: The number is not that important, my number is from either UW or Kaplan
: notes as i recall. But do you think the concept is right or not? I mean
: volume is not equals to pressure.
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