How long does it take for a patient with pulmonary encephalopathy to go from early to late stage?

Pulmonary encephalopathy is caused by hypoxia and carbon dioxide retention, and its progression is inextricably linked to the rate and degree of hypoxia onset. The faster and more severe the onset of hypoxia, the more rapidly the disease progresses. If oxygen supply stops completely, 4-5 minutes can cause irreversible damage to brain tissue, leading to death.

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