Systematic review and meta-analysis of the effectiveness of continuous glucose monitoring (CGM) on glucose control in diabetes

Nalinee Poolsup,Aye Mon Kyaw,Naeti Suksomboon

doi:10.1186/1758-5996-5-39

Nalinee Poolsup, Aye Mon Kyaw + Show 1 more

Open Access

https://doi.org/10.1186/1758-5996-5-39

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Abstract

Diabetes mellitus is a chronic disease that necessitates continuing treatment and patient self-care education. Monitoring of blood glucose to near normal level without hypoglycemia becomes a challenge in the management of diabetes. Although self monitoring of blood glucose (SMBG) can provide daily monitoring of blood glucose level and help to adjust therapy, it cannot detect hypoglycemic unawareness and nocturnal hypoglycemia which occurred mostly in T1DM pediatrics. Continuous glucose monitoring (CGM) offers continuous glucose data every 5 minutes to adjust insulin therapy especially for T1DM patients and to monitor lifestyle intervention especially for T2DM patients by care providers or even patients themselves. The main objective of this study was to assess the effects of continuous glucose monitoring (CGM) on glycemic control in Type 1 diabetic pediatrics and Type 2 diabetic adults by collecting randomized controlled trials from MEDLINE (pubmed), SCOPUS, CINAHL, Web of Science and The Cochrane Library up to May 2013 and historical search through the reference lists of relevant articles. There are two types of CGM device: real-time CGM and retrospective CGM and both types of the device were included in the analysis. In T1DM pediatrics, CGM use was no more effective than SMBG in reducing HbA1c [mean difference – 0.13% (95% CI -0.38% to 0.11%,]. This effect was independent of HbA1c level at baseline. Subgroup analysis indicated that retrospective CGM was not superior to SMBG [mean difference -0.05% (95% CI -0.46% to 0.35%)]. In contrast, real-time CGM revealed better effect in lowering HbA1c level compared with SMBG [mean difference -0.18% (95% CI -0.35% to -0.02%, p = 0.02)]. In T2DM adults, significant reduction in HbA1c level was detected with CGM compared with SMBG [mean difference – 0.31% (95% CI -0.6% to -0.02%, p = 0.04)].This systematic review and meta-analysis suggested that real-time CGM can be more effective than SMBG in T1DM pediatrics, though retrospective CGM was not. CGM provided better glycemic control in T2DM adults compared with SMBG.

Highlights

The global prevalence of diabetes by International Diabetes Federation (IDF) estimation shows that there are 366 million people with diabetes in 2011, and this is expected to rise to 552 million by 2030 [1]
Type 1 diabetic pediatrics The available evidence from this meta-analysis suggests that Continuous glucose monitoring (CGM) use was no more effective than Self monitoring of blood glucose (SMBG) in reducing Hemoglobin A1c (HbA1c) in type 1 diabetic pediatrics
The results of subgroup analyses showed that Real-Time CGM (RT-CGM) can be more effective than SMBG in reducing HbA1c

Summary

Introduction

The global prevalence of diabetes by International Diabetes Federation (IDF) estimation shows that there are 366 million people with diabetes in 2011, and this is expected to rise to 552 million by 2030 [1]. Self monitoring of blood glucose (SMBG) has been shown to be as effective in insulin-treated type 1 and type 2 diabetes. The effect of SMBG already demonstrated in some meta-analysis [8,9], it is not recommended as regularly use in non-insulin treated type 2 diabetes. Continuous glucose monitoring (CGM) measures interstitial fluid every 10 seconds and an average glucose value is recorded every five minutes 24 hours a day. This gives a more accurate pattern of daily glucose fluctuations allowing identification of the glycemic effect of food, physical activity, insulin and different medication types and doses aiding in better self management with avoiding unrecognized hypoglycemia [13]

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