cyanosis AE cyanosis central AE https://pubmed.ncbi.nlm.nih.gov/32644593/ 10011704 中枢性紫绀 This is an AE which is a generalized bluish discoloration of the body and the visible mucous membranes, which occurs due to inadequate oxygenation secondary to conditions that lead to an increase in deoxygenated hemoglobin or presence of abnormal hemoglobin. QY, JX, HY