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Continuous Glucose Monitoring

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Clinical Implications of Real-time and Intermittently Scanned Continuous Glucose Monitoring

Source: Diabetes Care

Key Takeaways: CGM has emerged as a new standard of care for individuals with insulin-treated diabetes. Two types of CGM systems are now available: real-time CGM (rtCGM) and intermittently scanned (isCGM). rtCGM systems automatically transmit a continuous stream of glucose data to the user, provide alerts and active alarms, and transmit glucose data in real time to a smart phone and/or other display device. The current isCGM system provides the same type of data but requires the user to purposely scan the sensor to obtain information, and it does not have alerts and alarms. Both CGM technologies have significant advantages over self-monitoring of blood glucose; however, differences in the features and capabilities of the two approaches must be considered when guiding patient selection of the system that meets their individual needs.


Continuous Glucose Monitoring: An Emerging Standard of Care

Source: American Journal of Managed Care

Key Takeaway: The use of CGM is proven to reduce A1C, reduce time spent in hypo- and hyperglycemia and improve time in range (TIR) for Type 1 and Type 2 patients using intensive insulin, defined as multiple daily injections of insulin or getting insulin through an insulin pump.  This has resulted in guidelines and recommendations from professional societies such as the ADA recommending CGM as a standard of care for Type 1 and Type 2 patients using intensive insulin.  CGM is an important monitoring tool that is best accessed by providers and patients in the pharmacy channel.


Continuous Glucose Monitoring with Dexcom G6

Source: First Report Managed Care

Key Takeaway: Diabetes is a complex chronic disease that for some Type 1 and Type 2 patients requires the use of intensive insulin defined as 3 or more injections/day or insulin through a pump.  The adverse consequences of using insulin are severe and can result in a coma, seizure or even death which leads many patients and caregivers deciding to use less insulin as prescribed preventing achievement of glycemic goals.  Real-time CGM with alerts/alarms, remote monitoring and reporting can help patients use their insulin safely and effectively to achieve lower A1Cs, spend less time in hypo- and hyperglycemia and spend more time in range (TIR).  The benefits of CGM are seen when it is used to make diabetes treatment decisions such as insulin dosing, diet and lifestyle in a timely manner.  Accessing CGM devices via a pharmacy benefit allows patients to start CGM faster, stay safe while using insulin and engage pharmacists, providing additional support and interventions that have been shown to improve diabetes outcomes.


Clinical Targets for Continuous Glucose Monitoring Data Interpretation: Recommendations From the International Consensus on Time in Range

Source: Diabetes Care

Key Takeaway: Successful utilization of CGM technology in routine clinical practice remains relatively low due to a lack of clear and agreed-upon glycemic targets that both diabetes teams and people with diabetes can work toward.  In February 2019, the Advanced Technologies & Treatments for Diabetes (ATTD) Congress convened an international panel of physicians, researchers, and individuals with diabetes who are expert in CGM technologies to address this issue and established targets for time in range (TIR), time below range (TBR) and time above range (TAR).  These are metrics that only CGM can measure and overcome the limitations of metrics such as A1C which are reflective of a 3 month average of glycosylated hemoglobin and does not account for day to day glycemic variability or factors such as anemia which can skew A1C low.

CGM-based Targets for Different Diabetes Populations