DefinitionThis section has been translated automatically.
Reduced O2 saturation of the arterial blood (pulse oximetry). Clinical sign is cyanosis of skin and tongue/oral mucosa.
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Lewis test: After compression of the earlobe (until the capillary pulse occurs) the earlobe remains bluish-cyanotic in central cyanosis. In peripheral cynaosis the blue discoloration disappears.
Prof. Dr. med. Peter Altmeyer