A retrospective study was performed at the ICU of Chifeng Municipal Hospital from March 2012 to February 2018. Data retrieved through the hospital's electronic case system. Inclusion criteria:
Aged between 18 and 89;
Admission for over 24 h;
The blood ammonia level of over 35 umol/L was treated as hyperammonemia. Exclusion criteria: Excluded patients with liver disease.
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