The equation of motion is represented by which of the following?
a. PTA = PA ? Raw
b. PTR = Paw + PA
c. Pvent + Pmus = Raw + PTA
d. Pvent + Pmus = Raw ? PA
ANS: B
The transrespiratory pressure (PTR) is the pressure generated by either the patient contracting the respiratory muscles or by the ventilator pushing the volume into the patient. This pressure is op-posed by the elastic recoil pressure (PE) and the flow resistance pressure (PR). The transairway pressure (PTA) is the pressure gradient between the airway opening and the alveolus. This pro-duces airway movement in the conductive airways. It represents only part of the equation of mo-tion, the pressure needed to overcome the airway resistance. The equation of motion may be rep-resented, on one side, by Pvent + muscle pressure (Pmus). However, this is equal to the elastic recoil pressure (V/C) plus the flow resistance pressure (Raw ? ) or Pvent + Pmus = V/C + (Raw ? ).
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