Accuracy of Continuous Glucose Monitoring in Patients With Diabetes. A Prospective Observational Study
The goal of this observational study is to investigate the accuracy of the continuous glucose monitoring (CGM) compared to standard point-of-care (POC) blood glucose measurements in patients with diabetes in patients who during their hospital admission can experience circulatory impairment.

The main questions it aims to answer are:

• Do CGM measurements have a decreased accuracy compared to standard blood glucose measurements in periods with circulatory impairment?

Participants will be asked to wear a blinded CGM device (Dexcom G7, Dexcom Inc.) during their stay in the hospital but will receive standard care of their diabetes. The CGM device will be worn for up to 10 days.
- EligibilityCriteria: Inclusion Criteria:  Medical history with diabetes mellitus requiring antidiabetic drugs Age ≥18 years Surgery with estimated surgery time ≥45 minutes with expected stay for at least one night in hospital postoperatively OR Admission to the ICU with Circulatory impairment defined as need of vasopressors to maintain a mean arterial pressure (MAP) ≥65 mmHg and peripheral perfusion index <1.5  Exclusion Criteria:  Local skin symptoms including infection at the posterior aspect of the upper arm that does not allow the sensor to be placed on an unaffected skin area Contraindications to skin puncture (arteriovenous fistula for dialysis, post-mastectomy lymphoedema etc) Known allergy to plaster used in the CGM device - HealthyVolunteers: No - Gender: All - MinimumAge: 18 Years - StdAgeList: Adult, Older Adult - StudyPopulation: To the answer of our two research questions, we include both patients with diabetes undergoing surgery, and patients with diabetes admitted to the intensive care unit with circulatory impariment, as described in the criteria above.  We aim to exclude only patients with direct contraindications to the wear of the CGM. - SamplingMethod: Probability Sample