title: Cluster analysis of self-monitoring blood glucose assessments in clinical islet cell transplantation for type 1 diabetes.
abstract: OBJECTIVE
  Cluster analysis was performed on the results of self-monitoring of blood glucose (SMBG) to discriminate islet graft function after islet cell transplantation (ICT) in patients with type 1 diabetes.
  
  
  METHODS
  Eleven islet recipients were included in this study. The patients visited our clinic monthly after ICT and provided blood samples for fasting C-peptide (n = 270), which were used to evaluate islet graft function. They also provided their SMBG data through an automatic data collection system. The SMBG data for 3 days immediately before each clinic visit were evaluated using the following assessments: M value, mean amplitude of glycemic excursions, J index, index of glycemic control, average daily risk range, and glycemic risk assessment diabetes equation. The cluster analysis was performed for both SMBG assessments and samples. Multivariate logistic regression analysis was used to evaluate the clusters of SMBG for assessing islet graft function.
  
  
  RESULTS
  Analysis for SMBG assessments revealed five types of clusters, which showed similar patterns according to functional or dysfunctional islet graft phase. Two clusters, the euglycemia cluster (P < 0.001) and the hypoglycemia cluster (P = 0.001), were significant factors in the logistic model for islet graft function. The SMBG clusters had significant correlations with clinical graft indexes (P < 0.001).
  
  
  CONCLUSIONS
  Cluster analysis of SMBG data as part of an automated data quality system could allow discrimination of islet graft dysfunction after ICT. This approach should be considered for islet recipients.
authors.affiliation: Baylor Research Institute Fort Worth Campus, Fort Worth, TX, USA.
authors.forename: Morihito
authors.initials: M
authors.lastname: Takita
authors.forename: Shinichi
authors.initials: S
authors.lastname: Matsumoto
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Noguchi
authors.forename: Masayuki
authors.initials: M
authors.lastname: Shimoda
authors.forename: Daisuke
authors.initials: D
authors.lastname: Chujo
authors.forename: Takeshi
authors.initials: T
authors.lastname: Itoh
authors.forename: Koji
authors.initials: K
authors.lastname: Sugimoto
authors.forename: Jeffery A
authors.initials: JA
authors.lastname: Sorelle
authors.forename: Nicholas
authors.initials: N
authors.lastname: Onaca
authors.forename: Bashoo
authors.initials: B
authors.lastname: Naziruddin
authors.forename: Marlon F
authors.initials: MF
authors.lastname: Levy
mesh_terms: D000328:Adult; D001786:Blood Glucose / Q000032:analysis*; D015190:Blood Glucose Self-Monitoring / Q000379:methods*; D016000:Cluster Analysis; D003922:Diabetes Mellitus, Type 1 / Q000097:blood*; D005260:Female; D006801:Humans; D016381:Islets of Langerhans Transplantation; D016015:Logistic Models; D008297:Male; D008875:Middle Aged
chemical_list: D001786:Blood Glucose