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Real-Time Continuous Glucose Monitoring Immediately After Severe Hypoglycaemia Requiring Emergency Medical Services: A Randomised Controlled Trial.

AIMS: Severe hypoglycaemia requiring emergency medical services remains prevalent despite advances in all aspects of diabetes self-management. Real-time continuous glucose monitoring (RTCGM) technologies can reduce the risk of severe hypoglycaemia for adults with type 1 diabetes, but the impact of these devices has not been assessed in the acute phase after an episode of severe hypoglycaemia.

METHODS: We recruited and randomised 35 adults with type 1 diabetes in the acute period after an episode of severe hypoglycaemia requiring emergency medical services and randomised participants to RTCGM with alerts and alarms, or usual care with self-monitored blood glucose for 12 weeks with intermittent blinded CGM. The primary outcome was the difference between groups in percentage time spent in hypoglycaemia (≤3.0 mmol/L, 55 mg/dL).

RESULTS: Thirty participants completed the study (median (IQR) age, duration of diabetes, and BMI was 43 (36 - 56) years, 26 (19 - 37)years, and 24.9 (21.9 - 29.0) kg/m2 , respectively). Sufficient CGM data was available for 15 participants in RT-CGM group and 8 in SMBG group for the primary outcome analysis. The RTCGM group had a significantly larger reduction in exposure to glucose below 3.0mmol/L (RTCGM -0.16 [-1.23 to 0.01] vs SMBG 1.58 [0.41 to 3.48], p=0.03) and episodes of nocturnal hypoglycaemia (RT-CGM -0.03 [-0.15 to 0.02] vs SMBG 0.05 [-0.03 to 0.40], p=0.02). Episodes of severe hypoglycaemia were significantly lower in the RTCGM group (RTCGM 0.0 vs SMBG 4.0, p 0.04).

CONCLUSIONS: RTCGM implemented acutely after an episode of severe hypoglycaemia is feasible and clinically effective with important implications for hypoglycaemia management pathways and self-monitoring cost effectiveness.

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