Certified Transport Registered Nurse Certification Practice Exam

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Carbon monoxide poisoning is classified as which type of hypoxia?

  1. Histotoxic hypoxia

  2. Stagnant hypoxia

  3. Hypoxic hypoxia

  4. Hyperemic hypoxia

The correct answer is: Stagnant hypoxia

Carbon monoxide poisoning is classified as stagnant hypoxia because it involves an inability of the blood to effectively carry oxygen to the tissues due to the presence of carbon monoxide. In this condition, carbon monoxide binds to hemoglobin with a much greater affinity than oxygen does, which results in a reduced capacity for oxygen transport in the blood. Despite adequate oxygen levels in the environment and normal lungs being able to oxygenate the blood, the presence of carbon monoxide interferes with the delivery of oxygen to the tissues, causing cellular hypoxia. Understanding stagnant hypoxia in the context of carbon monoxide poisoning highlights the critical relationship between the transport and delivery of oxygen in the bloodstream, differentiating it from other types of hypoxia, where the mechanisms of impairment and the sources of the hypoxia vary significantly. This insight is crucial for healthcare professionals in diagnosing and treating cases of carbon monoxide exposure and related conditions.