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Cyanosis is seen if:

 # Cyanosis is seen if:
a) Meth Hb 1.5gm%
b) Sulf Hb 0.5gm%
c) Reduced Hb 5gm%
d) All of the above



The correct answer is D. All of the above.


Types of cyanosis
- Central 
- Peripheral
- Cyanosis due to abnormal pigments (methemoglobin, sulfhemoglobin)
- Mixed

CENTRAL CYANOSIS
Mechanism:
Diminished arterial oxygen saturation

Sites:
On skin & mucous membranes
Eg.: Tongue, lips, cheeks

Temperature of the Limb
Warm

PERIPHERAL CYANOSIS
Mechanism:
Diminished flow of blood to the local part

Sites:
On skin only

Temperature of the Limb
Cold


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