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But once a person’s heart and breathing have stopped, the best way to revive the person, doctors say, is by using a process known as extracorporeal rewarming — taking the blood from a person’s body, warming it externally, enriching it with oxygen, and pumping it back.

He cited one case in which a 16-year-old girl found without a pulse after hours in the cold had been declared dead before extracorporeal warming was attempted.

The study found patients requiring supplemental oxygen, mechanical ventilation or extracorporeal membrane oxygenation were less likely to die or be discharged to hospice after taking dexamethasone within 48 hours of either their hospital admission or an “escalation in oxygen support.”

She explained various medical procedures and the extracorporeal membrane oxygenation machine, or ECMO, that was keeping her alive.

The government investigation said doctors placed Dr. Li on extracorporeal membrane oxygenation.