title: Unrecognised hypoglycaemia in children and adolescents with type 1 diabetes using the continuous glucose monitoring system: prevalence and contributors.
abstract: OBJECTIVE
  To determine prevalence of hypoglycaemia, and contributing factors, in children with type 1 diabetes, using the Medtronic MiniMed continuous glucose monitoring system (CGMS).
  
  
  METHODS
  Fifty-one children and adolescents with diabetes were studied with the CGMS. The studies were analysed for frequency and duration of hypoglycaemia (below 3.5 and 2.5 mmol/L). Contributing clinical factors were determined. Occurrence of nocturnal hypoglycaemia was related to bedtime and fasting home glucose recording.
  
  
  RESULTS
  Hypoglycaemia was common, with 1 (0-4.2) (median (range)) episode per patient per 24 hours, and 0.33 (0-2) episodes per patient per night. Nocturnal episodes were longer than daytime episodes [97.5 (5-720) versus 35 (5-295) minutes for episodes below 3.5 mmol/L, P < 0.001; and 75 (10-640) versus 25 (5-200) minutes for episodes below 2.5 mmol/L, P < 0.001], and less likely to be recognised by the subject (P < 0.001 for episodes below both 3.5 and 2.5 mmol/L). Nocturnal hypoglycaemia was more common with a bedtime glucose recording <6 mmol/L, but also occurred frequently in subjects with glucose recordings >10 mmol/L. No bedtime glucose value reduced the risk of nocturnal hypoglycaemia to <10%.
  
  
  CONCLUSIONS
  Hypoglycaemia, assessed using the CGMS, is common in children with type 1 diabetes and can be prolonged (although is predominantly mild). Bedtime home glucose recordings are poorly predictive of hypoglycaemia during the following night. Continuous glucose monitoring has proven very useful in management of individual patients, particularly adolescents experiencing difficulties with adherence to diabetes management.
authors.affiliation: Department of Paediatrics and Child Health, Wellington School of Medicine and Health Sciences, Wellington South, New Zealand. esko.wiltshire@otago.ac.nz
authors.forename: Esko J
authors.initials: EJ
authors.lastname: Wiltshire
authors.forename: Kirsty
authors.initials: K
authors.lastname: Newton
authors.forename: Lindsay
authors.initials: L
authors.lastname: McTavish
mesh_terms: D000293:Adolescent; D015190:Blood Glucose Self-Monitoring / Q000379:methods*; D002648:Child; D003922:Diabetes Mellitus, Type 1 / Q000150:complications*; D005215:Fasting; D005260:Female; D006801:Humans; D007003:Hypoglycemia / Q000453:epidemiology* / Q000209:etiology; D008297:Male; D009520:New Zealand / Q000453:epidemiology; D015995:Prevalence