The impact of hypoglycaemia awareness status on regional brain responses to acute hypoglycaemia in men with type 1 diabetes.

Autor: Dunn JT; Division of Imaging Sciences and Biomedical Engineering, King's College London, London, UK., Choudhary P; Diabetes Research Group, King's College London, King's College Hospital Campus, Weston Education Centre, 10 Cutcombe Road, London, SE5 9RJ, UK.; Institute of Diabetes and Obesity, King's Health Partners, London, UK., Teh MM; Diabetes Research Group, King's College London, King's College Hospital Campus, Weston Education Centre, 10 Cutcombe Road, London, SE5 9RJ, UK.; Singapore General Hospital, Singapore, Republic of Singapore., Macdonald I; School of Life Sciences, University of Nottingham, Nottingham, UK., Hunt KF; Diabetes Research Group, King's College London, King's College Hospital Campus, Weston Education Centre, 10 Cutcombe Road, London, SE5 9RJ, UK.; Institute of Diabetes and Obesity, King's Health Partners, London, UK., Marsden PK; Division of Imaging Sciences and Biomedical Engineering, King's College London, London, UK., Amiel SA; Diabetes Research Group, King's College London, King's College Hospital Campus, Weston Education Centre, 10 Cutcombe Road, London, SE5 9RJ, UK. stephanie.amiel@kcl.ac.uk.; Institute of Diabetes and Obesity, King's Health Partners, London, UK. stephanie.amiel@kcl.ac.uk.
Jazyk: angličtina
Zdroj: Diabetologia [Diabetologia] 2018 Jul; Vol. 61 (7), pp. 1676-1687. Date of Electronic Publication: 2018 May 12.
DOI: 10.1007/s00125-018-4622-2
Abstrakt: Aims/hypothesis: Impaired awareness of hypoglycaemia (IAH) in type 1 diabetes increases the risk of severe hypoglycaemia sixfold and can be resistant to intervention. We explored the impact of IAH on central responses to hypoglycaemia to investigate the mechanisms underlying barriers to therapeutic intervention.
Methods: We conducted [ 15 O]water positron emission tomography studies of regional brain perfusion during euglycaemia (target 5 mmol/l), hypoglycaemia (achieved level, 2.4 mmol/l) and recovery (target 5 mmol/l) in 17 men with type 1 diabetes: eight with IAH, and nine with intact hypoglycaemia awareness (HA).
Results: Hypoglycaemia with HA was associated with increased activation in brain regions including the thalamus, insula, globus pallidus (GP), anterior cingulate cortex (ACC), orbital cortex, dorsolateral frontal (DLF) cortex, angular gyrus and amygdala; deactivation occurred in the temporal and parahippocampal regions. IAH was associated with reduced catecholamine and symptom responses to hypoglycaemia vs HA (incremental AUC: autonomic scores, 26.2 ± 35.5 vs 422.7 ± 237.1; neuroglycopenic scores, 34.8 ± 88.8 vs 478.9 ± 311.1; both p < 0.002). There were subtle differences (p < 0.005, k ≥ 50 voxels) in brain activation at hypoglycaemia, including early differences in the right central operculum, bilateral medial orbital (MO) cortex, and left posterior DLF cortex, with additional differences in the ACC, right GP and post- and pre-central gyri in established hypoglycaemia, and lack of deactivation in temporal regions in established hypoglycaemia.
Conclusions/interpretation: Differences in activation in the post- and pre-central gyri may be expected in people with reduced subjective responses to hypoglycaemia. Alterations in the activity of regions involved in the drive to eat (operculum), emotional salience (MO cortex), aversion (GP) and recall (temporal) suggest differences in the perceived importance and urgency of responses to hypoglycaemia in IAH compared with HA, which may be key to the persistence of the condition.
Databáze: MEDLINE
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