The nurse is reviewing a patient's arterial blood gas results. Which condition should the nurse suspect is developing in this patient?

1. chronic obstructive pulmonary disease, hypercapnia
2. alkalytic response from sympathomimetics
3. hypercapnia with respiratory acidosis
4. hypoxemic respiratory failure, metabolic acidosis


Correct Answer: 4
Arterial blood gases are used to evaluate alveolar ventilation and gas exchange. With hypoxemic respiratory failure, the PaCO2 may be normal, 35 to 45 mmHg, or even low due to tachypnea. A pH of less than 7.35 and low bicarbonate levels indicate metabolic acidosis, typical of hypoxemic respiratory failure. Hypercapnia from COPD would be respiratory acidosis. Sympathomimetics do not produce alkalosis. The values do not indicate respiratory acidosis from hypercapnia, as the PaCO2 is within normal limits.

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