Observe the current status of prolonged mechanical ventilation (PMV) patients using high-flow nasal cannula oxygen therapy (experimental group) or traditional oxygen therapy (control group) after extubation, and compare the differences in ventilator weaning rates between the two groups. Record the ROX index (SpO2/FiO2/RR) at 2, 6, 12, and 24 hours after extubation in PMV patients and explore whether statistical methods can predict the weaning outcome within seven days. Use statistical methods to analyze whether comorbidities in the PMV population affect ventilator weaning rates.
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ROX index
Timeframe: From enrollment to preliminary data compilation, lasting a total of 4 months.
P/F ratio
Timeframe: From enrollment to preliminary data compilation, lasting a total of 4 months.