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Symptoms and Signs – Differential Diagnosis of Oxygen saturation, sources of errors
Abnormal haemoglobins: carboxyhaemoglobin, methaemoglobin
Hypoperfusion (e.g. shock)
Improper probe placement
Intensive ambient light
Motion artifact
MRI
Nail polish
Skin pigmentation
Venous congestion/pulsations: e.g. tricuspid valve incompetence
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