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In page Hypoxia (medicine):

"

Arterial oxygen tension can be measured by blood gas analysis of an arterial blood sample, and less reliably by pulse oximetry, which is not a complete measure of circulatory oxygen sufficiency. If there is insufficient blood flow or insufficient hemoglobin in the blood (anemia), tissues can be hypoxic even when there is high arterial oxygen saturation.

  • Shortness of breath[1]
  • Palpitations may occur in the initial phases. Later, the heart rate may reduce to a significant degree. In severe cases, abnormal heart rhythms may develop.[citation needed]
  • Nausea and vomiting[1]