The nurse is assessing the exhaled tidal volume (EVT) in a mechanically ventilated patient. The rationale for this assessment is to:
a. assess for tension pneumothorax.
b. assess the level of positive end-expiratory pressure.
c. compare the tidal volume delivered with the tidal volume prescribed.
d. determine the patient's work of breathing.
C
The EVT is assessed to determine if the patient is receiving the tidal volume that is prescribed. Volume may be lost because of leaks in the ventilator circuit, around the endotracheal tube cuff, or around a chest tube. The assessment will not detect a pneumothorax and does not assess positive end-expiratory pressure or work of breathing.
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