Do symptoms like cyanosis go away quickly?

Depends: Cyanosis is only relieved with oxygen. Total body cyanosis, like from COPD or pneumonia may need supplemental oxygen. If local to a finger like in reynaud's, then will improve when vascular spasm ends and oxygenated blood flow resumes.

Not if one is dead..: Typically, addressing the underlying cause with dictate if cyanosis will go away quickly. Why? The color refers to the color or blood and its level of oxygenation- lots of oxygen, then blood is bright red. If low in oxygenation, then it looks more purple. Therefore: 1. Cyanosis from choking? Yes if cause of choking is removed 2. Death? Unlikely.