Limitations
This study also has some shortcomings. First of all, some data need to be recorded in time, it is difficult for data collectors to avoid the operation process during the experiment. Secondly, this is a single-center study with a small number of included cases. Third, patients were only followed up within 48h, and no long-term follow-up was conducted to understand the long-term prognosis of patients. Finally, this study did not examine the content of catecholamine hormones in the blood of patients at different time points, which would be more convincing if this indicator was included in the observational indicators.