A 40 year old man is found unconscious in his garage with the car engine running. In the emergency department he is confused and reports headache. Pulse oximetry reads 99 percent. Arterial blood gas shows a normal partial pressure of oxygen. Which of the following best explains his tissue hypoxia?
- A)Reduced oxygen carrying capacity and impaired oxygen unloadingGABARITO
- B)Decreased dissolved oxygen content in plasma
- C)Reduced pulmonary compliance due to surfactant deficiency
- D)Increased methemoglobin formation from nitrite exposure
- E)Ventilation perfusion mismatch due to pulmonary arterial obstruction
Explicação
Reduced oxygen carrying capacity and impaired oxygen unloading is correct. Carbon monoxide binds hemoglobin with very high affinity, decreasing available oxygen binding sites and shifting the oxygen hemoglobin dissociation curve to the left, which impairs oxyg... Ver explicação completa e trilha adaptativa →