Types of Hypoxia
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Diminished delivery of O2 to the alveolar capillaries is termed hypoxic hypoxia and may occur at high altitude with decreased PO2 but you are more likely to see it in your ED in patients with COPD, reduced ventilation and those with right-to-left shunts leading to significant intermixing of venous and arterial blood.
COHb absorbs roughly the same wavelength of light as oxy Hb. Pulse oximeters therefore overestimate true SaO2 with the degree of overestimation proportional to the level of COHb.Select the appropriate type of hypoxia according to the description.
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- Anaemic hypoxia
- Ischaemic or stagnant hypoxia
- Histotoxic hypoxia
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Hb concentration is insufficient to transfer sufficient O2
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Circulatory failure prevents normally oxygenated blood being delivered to the tissues
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Disablement of oxidative phosphorylation enzymes in the mitochondria
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