Continuous Bloodsugar Monitoring System With a Sensor Compared to Fingerstick Bloodsugar Monitoring (GLUCOSENS)

March 31, 2025 updated by: Odense University Hospital

Continuous GLUCOse Monitoring System With a SENSor Compared to Fingerstick Glucose Monitoring in Surgical Wards (GLUCOSENS)

This clinical trial aims to compare a continuous glucose monitoring system with traditional fingerstick blood glucose monitoring. The study focuses on adult patients in general surgical wards who need regular blood glucose checks due to the risk of low or high blood sugar levels.

The goal is to learn if using a continuous glucose monitoring system is better than fingerstick monitoring in managing glucose levels, preventing complications, improving patient satisfaction and experience, reducing nursing staff workload, and improving nursing staff' experience. The study also compares the accuracy of glucose readings from the continuous glucose monitoring system with those from fingerstick tests and blood samples.

The hypothesis is that CGMS is accurate and effective for monitoring glucose levels in surgical patients. This could lead to better blood sugar control, fewer complications, shorter hospital stays, and improved experiences for both patients and nursing staff.

Study Overview

Detailed Description

Glucose control in surgical patients at risk of hyperglycemia and hypoglycemia is essential, as these conditions can lead to infections, poor surgical outcomes, prolonged hospital stays, and death. In 2022, the prevalence of diagnosed diabetes in Denmark was 6.2%. With the global incidence of diabetes on the rise, the number of patients requiring glucose control during surgical admissions is increasing.

Point-of-care (POC) fingerstick capillary glucose monitoring (FSGM) is standard in many hospitals; however, FSGM can be painful, disrupt sleep, and increase postoperative stress for patients. Additionally, it can be time-consuming, requiring up to two hours of nursing work per patient daily. This makes timely and prescribed glucose monitoring challenging in busy surgical wards, potentially leading to untreated hyperglycemia and hypoglycemia. Moreover, FSGM provides only a snapshot of glucose levels, without indicating whether glucose is stable, rising, or falling.

An alternative to FSGM is continuous glucose monitoring systems (CGMS), which measure glucose levels via a subcutaneous sensor every few minutes. CGMS is predominantly used in ambulatory settings and has been shown to improve glucose regulation. Several studies have confirmed the accuracy of CGMS compared to FSGM in surgical and medical wards, reporting an overall mean absolute relative difference ranging from 9.4 to 12.9, making it acceptable for use in surgical wards. Other studies have reported that CGMS in surgical and medical wards results in superior glycemic control, reduced hypoglycemia, insulin usage, and in-hospital complications, and detected significant duration of both hypo- and hyperglycemia despite protocolized perioperative diabetes management compared to FSGM.

Studies on patients' perspectives of CGMS have been limited to everyday life and outpatient settings. One review on patients with type 1 and 2 diabetes experienced improved convenience, control, and freedom by the use of CGMS but were also overwhelmed by data and frustrated by inaccuracy, and technical issues, which is consistent with findings from another review of patients with diabetes type 2. Another study reported that patients with type 2 diabetes found the technology helpful for disease management, although it could also serve as an unpleasant reminder of disease progression and cause discomfort.

One case report has described nurses' experiences with CGMS in hospital wards for patients with type 1 diabetes. The nurses experienced an increased workload due to difficulties hearing the device receiver, leading to more frequent patient observations.

In summary, CGMS has been reported to be safe and beneficial in ambulatory settings, while challenges and knowledge gaps remain in hospital wards. To date, no studies have compared glucose levels from CGMS with those from a laboratory plasma glucose analyzer as the reference. This study aims to investigate the effect of CGMS compared to FSGM in patients with hyperglycemia in general surgical wards on glucose levels, complications, length of hospital stay, and patient satisfaction and experience with glucose management during hospitalization and up to three months after discharge. Additionally, the study will investigate the nursing staff's workload and experience in the surgical ward, and the accuracy of CGMS throughout hospitalization, including during surgical procedures and medical imaging.

Seven substudies will be conducted:

Substudy 1 - Glucose levels and management for surgical patients in relation to hospitalization: Compares point-of-care glucose levels and management using point-of-care FSGM and point-of-care CGMS during hospitalization and FSGM and continuous glucose monitoring (CGM) up to three months after discharge.

Substudy 2 - Patient satisfaction with glucose monitoring and management in surgical wards: Compares patient satisfaction with glucose monitoring and management for surgical patients using point-of-care FSGM and point-of-care CGMS during hospitalization.

Substudy 3 - Nursing staff's glucose monitoring and management workload in the surgical ward: Compares the nursing staff's workload with point-of-care FSGM to point-of-care CGMS for surgical patients.

Substudy 4 (qualitative study) - Patient experience of glucose monitoring and management in relation to hospitalization in surgical wards: Compares the patient experience with point-of-care FSGM to point-of-care CGMS and glucose management during hospitalization in the surgical ward and one compares the patient experience of FSGM with CGM one month after discharge.

Substudy 5 - Continuous glucose level for surgical patients in relation to hospitalization in the surgical ward: Compares the continuous glucose levels when glucose monitoring and management are performed by point-of-care FSGM and point-of-care CGMS in the surgical ward. Further, it compares continuous glucose levels using point-of-care FSGM and CGM after discharge.

Substudy 6 - Accuracy of CGMS for surgical patients during hospitalization: Investigates the accuracy of CGMS by comparing CGMS data with FSGM and plasma glucose data.

Substudy 7 (qualitative study) - Nursing staff's experience with fingerstick monitoring and CGSM for surgical patients: Compares the nursing staff's experience with point-of-care FSGM to point-of-care CGMS and glucose management for surgical patients.

Study Type

Interventional

Enrollment (Estimated)

329

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

      • Køge, Denmark, 4600
        • Recruiting
        • Department of Surgery, Zealand University Hospital
        • Contact:
          • Tine Lumbye Thomsen, RN, MCN
      • Odense, Denmark, 5000
        • Recruiting
        • The Department of Surgery, Odense Univeristy Hospital
        • Contact:
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Hospitalized patients (≥ 18 years old) in surgical wards
  • Glucose measurements at least 4 times (OUH) and 3 times (SUH) daily for at least three days, prescribed by surgeon
  • Expected hospitalization for at least three days
  • Communicates in Danish
  • Signed a declaration of consent to study participation
  • At risk of hypo- and hyperglycemia (with or without a diabetes diagnosis)
  • Specific for substudy 4 inclusion criteria as above with the following add on: Patients being treated with insulin at discharge and patients residing within the OUH admission area.

Exclusion Criteria:

  • Cognitively impaired patients
  • Indication for glucose monitoring solely because of parenteral nutrition treatment
  • Patients admitted with a CGMS
  • Patients from the point-of-care fingerstick capillary glucose monitoring group cannot be included in the continuous glucose monitoring system group

Eligibility criteria solely for substudy 7

Inclusion Criteria:

  • Nursing staff with at least one month of experience with both point-of-care fingerstick capillary glucose monitoring and continuous glucose monitoring system and are registered nurses or certified nursing assistants

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
No Intervention: PERIOD 1: Point-of-care fingerstick glucose monitoring = standard care
Subjects' blood glucose levels are monitored using point-of-care fingerstick capillary glucose monitoring (standard care), which is conducted by surgical ward nurses according to a predefined schedule. Diabetes treatment management is overseen by specific in-house diabetes nurses. Treatment decisions are based on point-of-care fingerstick capillary glucose values.
Active Comparator: PERIOD 2: Glucose monitoring system as point-of-care = study intervention

The sensor from the continuous glucose monitoring system is scanned by surgical nurses as point-of-care according to the predefined schedule, as in standard care. Monitoring is conducted by surgical ward nurses.

Diabetes treatment management is overseen by specific in-house diabetes nurses. Diabetes nurses' treatment decisions are based on the continuous glucose monitoring system values.

The sensor is placed subcutaneously at the back of the participant's upper arm with one insertion and measures the subcutaneous glucose concentration.
Experimental: PERIOD 3: Point-of care fingerstick glucose monitoring = standard care + blinded sensor

PERIOD 3: Same as for period 1, but with a blinded sensor (FreeStyle Libre Pro). The data from the blinded sensors are concealed from both participants and nurses and will be used for comparison with the experimental arm.

This study period is only conducted at OUH.

The sensor is placed subcutaneously at the back of the participant's upper arm with one insertion and measures the subcutaneous glucose concentration.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Substudy 1: Mean daytime and nocturnal point-of-care glucose levels
Time Frame: During hospitalization (up to 30 days)

Point-of-care glucose levels measured by point-of-care continuous glucose monitoring system (CGMS) or point-of-care fingerstick capillary glucose monitoring (FSGM)

Arm allocation:

Period 1: FSGM Period 2: CGMS Number of measurements: minimum four times daily, hourly if fasting. Blood glucose measurement: mmol/L

During hospitalization (up to 30 days)
Substudy 2: Patient-reported outcome on the convenience of glucose monitoring
Time Frame: During hospitalization (up to 30 days)

Using the validated Danish version of the 22-item questionnaire: The Diabetes Treatment Satisfaction Questionnaire for Inpatients (DTSQ-IP), item 4: How convenient did you think the diabetes treatment was at hospitalization?

Ranging from 0 - 6

0 represents 'At no time' 6 represents 'At most of the time'

During hospitalization (up to 30 days)
Substudy 3: Mean minutes surgical nursing staff spent on bedside glucose monitoring
Time Frame: During hospitalization (up to 30 days)

Mean time: minutes.

Data include:

  • Profession
  • Preparation (gathering materials, handwashing, disinfecting hands, putting on gloves, etc.)
  • Time for fingerstick or scanning of the continuous glucose monitor sensor
  • Display time of glucose level on device
  • Glucose level (mmol/L)
  • Actions taken after measurement (insulin injection, handwashing, documentation, disinfection, etc.)
  • Time for leaving the room
  • Time for completed procedure including documentation
  • Other observations made during the measurement
During hospitalization (up to 30 days)
Substudy 5: Percentage of time in range (3.9-10.0 mmol/l) during the entire hospital stay
Time Frame: During hospitalization (up to 30 days)
Percentage of time in range (3.9-10.0 mmol/l) during the entire hospital stay
During hospitalization (up to 30 days)
Substudy 6: Differences in interstitial and plasma glucose
Time Frame: During hospitalization (up to 30 days)
Glucose levels from CGMS are compared to plasma glucose, which are co-analyzed in blood tests.
During hospitalization (up to 30 days)

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Substudy 1: Readmission
Time Frame: 30-days after discharge from hospital
Assesment of 30-day numbers of readmissions
30-days after discharge from hospital
Substudy 1: Mortality after discharge from hospital
Time Frame: 90-days after discharge from hospital
Assesment of 90-day numbers of mortality.
90-days after discharge from hospital
Substudy 1: HbA1c three months after discharge
Time Frame: 90-days after discharge from hospital
mmol/mol
90-days after discharge from hospital
Substudy 1: • Mean dose of short-acting insulin (IE)
Time Frame: During hospitalization (up to 30 days)
Unit: International units (IE)
During hospitalization (up to 30 days)
Substudy 1: Mean dose of long-acting insulin (IE)
Time Frame: During hospitalization (up to 30 days)
Unit: International units (IE)
During hospitalization (up to 30 days)
eGFR
Time Frame: During hospitalization (up to 30 days)
Estimated Glomerular Filtration Rate
During hospitalization (up to 30 days)
Substudy 1: Complication: Sepsis
Time Frame: During hospitalization (up to 30 days)
Defined as suspected or confirmed infection, as well as organ damage
During hospitalization (up to 30 days)
Substudy 1: Complication: Acute kidney failure
Time Frame: During hospitalization (up to 30 days)
Plasma creatinine, μmol/L
During hospitalization (up to 30 days)
Substudy 1: Complication: First acute transfer to intensive care unit
Time Frame: During hospitalization (up to 30 days)

The date for the first acute transfer to the intensive care unit and back to the surgical ward The number of days at the intensive care unit

Unit: Days

During hospitalization (up to 30 days)
Substudy 1: Complication: Second acute transfer to intensive care unit
Time Frame: During hospitalization (up to 30 days)

The date for the second acute transfer to the intensive care unit and back to the surgical ward The number of days at the intensive care unit

Unit: Days

During hospitalization (up to 30 days)
Substudy 1: Complication: Infections
Time Frame: During hospitalization (up to 30 days)
CRP, leucocytes, central body temperature. Unit: Days
During hospitalization (up to 30 days)
Substudy 1: Complication: Antibiotics
Time Frame: During hospitalization (up to 30 days)
Received antibiotics Unit: Days
During hospitalization (up to 30 days)
Substudy 1: Complication: Bedsore
Time Frame: During hospitalization (up to 30 days)
Presence of bedsore during hospitalization: yes/no
During hospitalization (up to 30 days)
Substudy 1: Complication: Diabetes ketoacidosis
Time Frame: During hospitalization (up to 30 days)
Diabetes ketoacidosis, defined as: pH < 7.30 and blood ketones > 3 mmol/L. Unit: Number of occurrence.
During hospitalization (up to 30 days)
Substudy 1: Complication: Anastomotic leak
Time Frame: During hospitalization (up to 30 days)
Presence of anastomotic leak during hospitalization: yes/no
During hospitalization (up to 30 days)
Substudy 1: Mortality during hospitalization
Time Frame: During hospitalization (up to 30 days)
Yes or no
During hospitalization (up to 30 days)
Substudy 1: TIR and other established outcome derived from CGM
Time Frame: 90-days after discharge from hospital
Percentage
90-days after discharge from hospital
Substudy 2: DTSQ-IP, treatment satisfaction (item 1)
Time Frame: During hospitalization (up to 30 days)

Ranging from 0 - 6

0 represents 'At no time' 6 represents 'Very satisfied'

During hospitalization (up to 30 days)
Substudy 2: DTSQ-IP, experience with hyper- and hypoglycemia (items 2-3)
Time Frame: During hospitalization (up to 30 days)

Ranging from 0 - 6

0 represents 'At no time' 6 represents 'At most of the time'

During hospitalization (up to 30 days)
Substudy 2: DTSQ-IP, treatment surveillance and flexibility (items 5+9),
Time Frame: During hospitalization (up to 30 days)

Ranging from 0 - 6

0 represents 'very unsatisfied"/"very inflexible' 6 represents ''very satisfied"very flexible"

During hospitalization (up to 30 days)
Substudy 2: DTSQ-IP, treatment information, knowledge, and communication (items 15-18)
Time Frame: During hospitalization (up to 30 days)

Ranging from 0 - 6

0 represents 'very unsatisfied' 6 represents 'very satisfied'

During hospitalization (up to 30 days)
Substudy 2: DTSQ-IP, contact with specialized diabetes nurses (items 20-21)
Time Frame: During hospitalization (up to 30 days)

Ranging from 0 - 6

0 represents 'very unsatisfied' 6 represents 'very satisfied'

During hospitalization (up to 30 days)
Substudy 3: Mean minutes surgical nursing staff spent on reporting glucose levels and management to diabetes nurses
Time Frame: During hospitalization (up to 30 days)
Measurement: Mean minutes
During hospitalization (up to 30 days)
Substudy 3: Mean minutes the diabetes nurse spent in relation to the surgical patients
Time Frame: During hospitalization (up to 30 days)
The mean minutes diabetes nurses spent collecting information about glucose levels and management, supervising patients and surgical professionals, and being supervised by endocrinologists.
During hospitalization (up to 30 days)
Substudy 5: CGMS, time above range (TAR) 10,1-13.9 mmol/l
Time Frame: During hospitalization (up to 30 days)
Percentage of time above range (TAR) 10,1-13.9 mmol/l
During hospitalization (up to 30 days)
Substudy 5: CGMS, time above range (TAR) >13.9 mmol/l
Time Frame: During hospitalization (up to 30 days)
Percentage of time above range >13.9 mmol/l
During hospitalization (up to 30 days)
Substudy 5: CGMS, time below range 3.0-3.9 mmol/l
Time Frame: During hospitalization (up to 30 days)
Percentage of time below range 3.0-3.9 mmol/l
During hospitalization (up to 30 days)
Substudy 5: CGMS, time below range <3.0
Time Frame: During hospitalization (up to 30 days)
Percentage of time below range <3.0 mmol/l
During hospitalization (up to 30 days)
Substudy 5: CGMS, standard deviation (SD)
Time Frame: During hospitalization (up to 30 days)
mmol/l
During hospitalization (up to 30 days)
Substudy 5: CGMS, coefficient of variation (CV)
Time Frame: During hospitalization (up to 30 days)
SD divided by mean glucose level
During hospitalization (up to 30 days)
Substudy 5: CGMS, mean glucose level daytime
Time Frame: During hospitalization (up to 30 days)
mmol/l
During hospitalization (up to 30 days)
Substudy 5: CGMS, mean glucose level night-time
Time Frame: During hospitalization (up to 30 days)
mmol/l
During hospitalization (up to 30 days)
Substudy 5: CGMS, Hypoglycemia level 1 (3.0-3.9 mmol/l)
Time Frame: During hospitalization (up to 30 days)
Duration more than 15 consecutive minutes
During hospitalization (up to 30 days)
Substudy 5: CGMS, hypoglycemia level 2 (<3.0 mmol/l)
Time Frame: During hospitalization (up to 30 days)
Duration more than 15 consecutive minutes
During hospitalization (up to 30 days)
Substudy 5: CGMS, number of hypoglycemic events in level 1 and 2, respectively
Time Frame: During hospitalization (up to 30 days)
Number
During hospitalization (up to 30 days)
Substudy 6: Differences in interstitial and capillary glucose
Time Frame: During hospitalization (up to 30 days)
Glucose levels from CGMS are compared to FSGM data, which are co-analyzed in blood tests.
During hospitalization (up to 30 days)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Investigators

  • Study Chair: Karoline Schousboe, MD, PhD, Steno Diabetes Center Odense, Odense University Hospital
  • Study Chair: Helen Schultz, RN, PhD, The Department of Surgery, Odense University Hospital

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

June 26, 2024

Primary Completion (Estimated)

December 31, 2025

Study Completion (Estimated)

December 31, 2025

Study Registration Dates

First Submitted

May 14, 2024

First Submitted That Met QC Criteria

June 18, 2024

First Posted (Actual)

June 25, 2024

Study Record Updates

Last Update Posted (Actual)

April 3, 2025

Last Update Submitted That Met QC Criteria

March 31, 2025

Last Verified

March 1, 2025

More Information

Terms related to this study

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

Yes

product manufactured in and exported from the U.S.

Yes

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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