A patient with ARDS has PEEP added to the mechanical ventilation therapy. Which assessment finding indicates that the use of PEEP has been effective?
1. PCO2 of 52 mm Hg
2. A PO2 of 92 mm Hg
3. A respiratory rate of 33
4. A urine output of 50 cc/hr
2
Rationale 1: The effectiveness of PEEP is not directly measured by pCO2 levels.
Rationale 2: PEEP causes the alveoli to remain open at the end of expiration, providing better oxygenation. Therefore, the PaO2 will be increased to normal level.
Rationale 3: PEEP does not affect respiratory rate. Tachypnea indicates that the patient is hypoxic.
Rationale 4: PEEP causes intrathoracic pressure, which decreases perfusion to the kidneys and would decrease urine output.
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