The purpose of the study is to evaluate the effect of real-time continuous glucose monitoring system on glucose control and outcomes of critically ill patients.

Real-time continuous glucose monitoring system has shown great accuracy and feasibility in critically ill patients. However, its impact on glucose control and outcomes has nearly unknown. Thus, Investigators designed this study to evaluate the effect of real-time continuous glucose monitoring system on glucose control and outcomes of critically ill patients.

Inclusion Criteria:

• More than 18 years old male or female;

  • Expected ICU stays longer than 72 hours;

    • Glucose level more than 8 mmol/L when enrolls in the ICU;

      • Patients or their legal surrogates have signed the informed consent.

Exclusion Criteria:

• Pregnant or lactating women;

  • ICU stays less than 72 hours;

    • Usage of real-time continuous glucose monitoring system is considered as a contraindication.