BPLS Hypoxia (via catecholamine release) produces vasoconstriction and skin pallor. CYANOSIS IS UNDER 70 %SATS

Hypoxia (via catecholamine release) produces vasoconstriction and skin pallor. Cyanosis is a late and pre-terminal sign of hypoxia as it usually becomes apparent when SpO2 falls to <70 absence="" anaemia="" and="" in="" of="" only="" span="" the="">