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Seasonal variation of HbA1c in intensive treatment of children with type 1 diabetes
Linköping University, Department of Clinical and Experimental Medicine, Child and Adolescent Psychiatry . Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Local Health Care Services in Central Östergötland, Department of Child and Adolescent Psychiatry.
Linköping University, Department of Clinical and Experimental Medicine, Pediatrics . Linköping University, Faculty of Health Sciences. Östergötlands Läns Landsting, Centre of Paediatrics and Gynecology and Obstetrics, Department of Paediatrics in Linköping.
2000 (English)In: Journal of pediatric endocrinology and metabolism, ISSN 0334-018X, Vol. 13, no 5, 529-535 p.Article in journal (Refereed) Published
Abstract [en]

OBJECTIVE: The aim of this study was to measure whether there is a seasonal variation in glycosylated haemoglobin concentrations and insulin dose used in the intensive treatment of children with type 1 diabetes, and whether such variation is related to severe hypoglycaemia.

PATIENTS: A geographic population of 114 intensively treated type 1 diabetic patients < 19 years of age, mean 12.7 (SD 4.3) years, with diabetes onset before 1995, were studied in a cohort 1995-96.

METHODS: HbA1c, insulin doses and severe hypoglycaemia were registered at regular visits scheduled quarterly, but not standardised in time. Seasonal mean values were calculated for HbA1c and insulin dose.

RESULTS: Lower HbA1c was seen in spring and summer, and higher in autumn and winter (p=0.023). Patients reporting severe hypoglycaemia had a seasonal variation in HbA1c (p=0.019) and a tendency to seasonal variation in insulin dose, while patients not reporting severe hypoglycaemia did not vary in HbA1c or insulin dose.

CONCLUSIONS: Self-control and adjustment of insulin doses to seasonal change need to be improved also in intensively treated children, with regard to the risk for worsened metabolic control after the summer and increased severe hypoglycaemia in spring and early summer. The findings have important implications for design of short-term studies of metabolic control.

Place, publisher, year, edition, pages
2000. Vol. 13, no 5, 529-535 p.
National Category
Medical and Health Sciences
Identifiers
URN: urn:nbn:se:liu:diva-13557OAI: oai:DiVA.org:liu-13557DiVA: diva2:20949
Available from: 2000-11-29 Created: 2000-11-29 Last updated: 2009-08-20
In thesis
1. On Severe Hypoglycaemia in Children and Adolescents with Type 1 Diabetes
Open this publication in new window or tab >>On Severe Hypoglycaemia in Children and Adolescents with Type 1 Diabetes
2000 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background: For people with type 1 diabetes, there is no alternative to treatment with insulin. The major side effect of insulin is severe hypoglycaemia (SH), when the patient needs help or even becomes unconscious.

Material: We have studied a geographic population of yearly 130-140 unselected type 1 diabetes patients aged 1-18 years during 1992-1999. They were intensively treated with 87-96% on 4-7 daily insulin doses, combined with active self-control, psychosocial support and problem-based education from onset. Average HbA1c was 6.5 with Mono-S standard (1.15% beow DCCT level).

Methods: We evaluated use of a prospective patient questionnaire for continuous long-term registration of treatment and outcome data and analysed HbA1c, SH and other variables. Over years, 95-100% response rate was achieved. We used also temporary questionnaries.

Results: We found SH with unconsciousness reported from on average 11% of patients yearly, SH without unconsciousness but needing assistance from on average 36% yearly and weak associations to HbA1c, such as reletive risk of SH 1.24 for yearly mean HbA1c <7.0% compared to ≥7.0% There was a seasonal variation in HbA1c (p=0.023) and incidence of SH. The strongest predictor for SH was SH during the previous year (r=9.38, p<0.0001).

The impact from SH showed great variation, and 20-30% of events led to practical disturbancies for parents and/or other people. Hospital visits took place only at 5% and hospitalisations at 3% of events. Social activities for patients were cancelled after 10% of events. Increased worry for patients was reported after 8% of events, bad sleep after 7%. We estimated the average socio-economic cost for SH at EURO 239 per event of SH with unconsciousness, and EURO 63 per event of SH without unconsciousness but needing assistance.

Mass-distributed self-study material (brochures and videos) aimed at the prevention of SH without compromising metabolic control reached high dissemination and was widely appreciated by patients. The material copy cost was only EURO 7 per patient. It also seems to have contributed to a decrease in SH with unconsciousness from yearly 13% of patients before to 9% after intervention (3-years average), but controlled studies are needed.

Conclusions: We conclude that SH remains a very serious problem of multifactorial aethiology. It causes considerable discomfort and costs. Systematic patient education mgiht reduce the incidence. Interventions using mass-distribution of high quality self-study material such as videos and brochures seem to have a potential to be cost-effective. There is a great patient/consumer interest in high quality- and advanced information/education materials.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2000. 67 p.
Series
Linköping University Medical Dissertations, ISSN 0345-0082 ; 648
Keyword
Severe hypoglycaemia, SH, diabetes, insulin, HbA1c, aethiology
National Category
Medical and Health Sciences
Identifiers
urn:nbn:se:liu:diva-5018 (URN)91-7219-749-8 (ISBN)
Public defence
(English)
Available from: 2000-11-29 Created: 2000-11-29 Last updated: 2012-01-24Bibliographically approved

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Nordfeldt, SamLudvigsson, Johnny

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Child and Adolescent Psychiatry Faculty of Health SciencesDepartment of Child and Adolescent PsychiatryPediatrics Department of Paediatrics in Linköping
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