title: Individuals with impaired glucose tolerance demonstrate normal cardiac sympathetic innervation using I-123 mIBG scintigraphy.
abstract: BACKGROUND
  Impaired glucose tolerance (IGT) is associated with an increased risk of type 2 diabetes (T2DM) and cardiovascular disease. Some but not all studies have reported cardiac autonomic dysfunction in subjects with IGT and there is only one direct study of cardiac innervation in subjects with IGT. The purpose of this study was to assess global and regional cardiac sympathetic innervation and cardiac autonomic function in individuals with IGT.
  
  
  RESULTS
  We undertook (123)I-mIBG scintigraphy and cardiac autonomic function in 15 subjects with IGT and 15 age and sex-matched healthy controls. Early heart to mediastinum ratio (HMR) (1.71 ± 0.17 vs 1.67 ± 0.13, P = .49), late HMR (1.73 ± 0.18 vs 1.73 ± 0.16, P = .97) and washout rate (WR) (18.6 ± 4.2 vs 19.1 ± 7.6%, P = .84), did not differ between subjects with IGT and control subjects. More detailed regional analysis revealed reduced tracer uptake at the apex, base and inferior wall in all subjects and the anterior wall in a minority of subjects. There were no differences in total score (56.6 ± 4.0 vs 53.3 ± 8.4, P = .193), modified score (48.5 ± 3.3 vs 46.2 ± 6.0, P = .215), anterior wall score (10.2 ± 1.3 vs 10.1 ± 1.6, P = .898), inferior wall score (8.9 ± 1.9 vs 7.7 ± 2.6, P = .163), basal score (18.7 ± 1.9 vs 18.2 ± 3.3, P = .636) and tests of cardiac autonomic function between the groups.
  
  
  CONCLUSIONS
  Global and regional measures of MIBG uptake and washout as well as cardiac autonomic function did not differ between subjects with IGT and healthy controls.
authors.affiliation: Institute of Cardiovascular Sciences, University of Manchester & Manchester Heart Centre, Central Manchester Foundation Trust, Manchester, United Kingdom. omar.asghar@manchester.ac.uk.
authors.forename: O
authors.initials: O
authors.lastname: Asghar
authors.affiliation: Department of Nuclear Medicine, Central Manchester Foundation Trust, Manchester, United Kingdom.
authors.forename: P
authors.initials: P
authors.lastname: Arumugam
authors.affiliation: Department of Nuclear Medicine, Central Manchester Foundation Trust, Manchester, United Kingdom.
authors.forename: I S
authors.initials: IS
authors.lastname: Armstrong
authors.affiliation: North West Heart and Transplant Centre, University Hospital of South Manchester, Manchester, United Kingdom.
authors.forename: S G
authors.initials: SG
authors.lastname: Ray
authors.affiliation: North West Heart and Transplant Centre, University Hospital of South Manchester, Manchester, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Schmitt
authors.affiliation: Centre for Endocrinology & Diabetes, Institute of Human Development, University of Manchester, Manchester, United Kingdom. Rayaz.A.Malik@manchester.ac.uk.|Weill Cornell Medical College, Doha, Qatar. Rayaz.A.Malik@manchester.ac.uk.
authors.forename: R A
authors.initials: RA
authors.lastname: Malik
mesh_terms: D019797:3-Iodobenzylguanidine; D000293:Adolescent; D000328:Adult; D000368:Aged; D002318:Cardiovascular Diseases / Q000000981:diagnostic imaging* / Q000209:etiology; D003924:Diabetes Mellitus, Type 2 / Q000150:complications / Q000000981:diagnostic imaging*; D005951:Glucose Tolerance Test; D006321:Heart / Q000000981:diagnostic imaging / Q000294:innervation*; D049690:History, Ancient; D006801:Humans; D008297:Male; D008875:Middle Aged; D011877:Radionuclide Imaging / Q000379:methods; D019275:Radiopharmaceuticals; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013564:Sympathetic Nervous System / Q000000981:diagnostic imaging*; D055815:Young Adult
chemical_list: D019275:Radiopharmaceuticals; D019797:3-Iodobenzylguanidine
keywords: MIBG imaging; SPECT; diabetes