To determine if a patient has a mixed acid-base disorder, which of the following results will the nurse study?
1. pH, PaCO2, BE
2. pH, PaCO2, PaO2
3. pH, PaCO2, HCO3
4. PaCO2, PaO2, BE
3
Rationale: Three pairs of relationships require analysis when seeking to differentiate the nature of a mixed acid–base disorder: (1) pH to HCO3, (2) pH to Paco2, and (3) Paco2 to HCO3. The study of the patient's PaO2 helps determine the oxygenation status. Base excess is not used to determine a mixed acid-base disorder.
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