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  • Title: Clinical characterisation of severe hypoglycaemia--a prospective population-based study.
    Author: Holstein A, Plaschke A, Egberts EH.
    Journal: Exp Clin Endocrinol Diabetes; 2003 Sep; 111(6):364-9. PubMed ID: 14520604.
    Abstract:
    AIM: To determine the clinical characteristics of severe hypoglycaemia (SH) in a nonselected German population. SH was defined as an event requiring intravenous glucose or glucagon injection. METHODS: The prospective population-based study screened sensitively for SH in a region with 200,000 inhabitants between 1997 and 2000. All 30,768 patients who presented to the regional central hospital emergency department, and 6,631 (85 %) of 7,804 patients attended by the emergency medical service in the region were given an initial blood glucose test to detect atypical hypoglycaemia. RESULTS: Altogether, 264 cases of SH were registered, which occurred either spontaneously (n = 14; 5 %), in subjects with type 1 (n = 92; 35 %) or type 2 diabetes (n = 148; 56 %), or in subjects with a non-classified form of diabetes (n = 10; 4 %). On the basis of the estimated local number of diabetic patients the annual rate of SH was 1.5 episodes per 100 patients in insulin-treated type 2 diabetics compared with a rate of 0.4 episodes per 100 patients for the overall group of type 2 diabetic patients. Nocturnal hypoglycaemia accounted for 44 % of episodes in patients with type 1 diabetes on intensified therapy but for only 25 % in patients with type 2 diabetes. 26 % of the hypoglycaemic individuals with type 1 diabetes had an impaired awareness of hypoglycaemia and thus recurrent hypoglycaemic episodes. Irrespective of the treatment, the most frequent contributing factors for SH in type 2 diabetic patients were advanced age (76 +/- 12 years), multimorbidity (3.6 +/- 2.6 concomitant diseases)--in particular renal impairment (54 % [80/148])--and polypharmacy (4 +/- 2.7 concomitant drugs). 34 % (50/148) of the subjects with type 2 diabetes lived in nursing homes or were cared for by a home nursing service. With standardised treatment zero mortality of SH in diabetic patients was achieved, only one non-diabetic died due to hepatic failure. CONCLUSION: In elderly, multimorbid patients approaching the insulin-deficient end of the spectrum of type 2 diabetes the risk of developing SH increases considerably, nearing that in patients with type 1 diabetes. In order to avoid SH in geriatric patients, the treatment targets should be defined critically, taking into account individual quality of life and life expectancy. Hypoglycaemia unawareness is a major risk factor for SH in type 1 diabetes.
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