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Diabetologia

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Clinical outcomes of an integrated primary–secondary model of care for individuals with complex type 2 diabetes: a non-inferiority randomised controlled trial

  • Anthony W. Russell
  • Maria Donald
  • Samantha J. Borg
  • Jianzhen Zhang
  • Letitia H. Burridge
  • Robert S. Ware
  • Nelufa Begum
  • H. David McIntyre
  • Claire L. Jackson
Article

Abstract

Aims/hypothesis

The aim of the study was to determine if a Beacon model of integrated care utilising general practitioners (GPs) with special interests could achieve similar clinical outcomes to a hospital-based specialist diabetes outpatient clinic.

Methods

This pragmatic non-inferiority multisite randomised controlled trial assigned individuals with complex type 2 diabetes to care delivered by a Beacon clinic or to usual care delivered by a hospital outpatient department, in a 3:1 ratio. Owing to the nature of the study, researchers were only blinded during the allocation process. Eligible participants were aged 18 or over, had been referred by their usual GP to the hospital central referral hub with type 2 diabetes and had been triaged to be seen within 30 or 90 days. The intervention consisted of diabetes management in primary care by GPs with a special interest who had been upskilled in complex diabetes under the supervision of an endocrinologist. The primary outcome was HbA1c at 12 months post-recruitment. The non-inferiority margin was 4.4 mmol/mol (0.4%). Both per-protocol and intention-to-treat analyses are reported.

Results

Between 27 November 2012 and 14 July 2015, 352 individuals were recruited and 305 comprised the intention-to-treat sample (71 in usual care group and 234 in the Beacon model group). The Beacon model was non-inferior to usual care for both the per-protocol (difference −0.38 mmol/mol [95% CI −4.72, 3.96]; −0.03% [95% CI −0.43, 0.36]) and the intention-to-treat (difference −1.28 mmol/mol [95% CI −5.96, 3.40]; −0.12% [95% CI −0.55, 0.31]) analyses. Non-inferiority was sustained in a sensitivity analysis at 12 months. There were no statistically or clinically significant differences in the secondary outcomes of BP, lipids or quality of life as measured by the 12 item short-form health survey (SF-12v2) and the diabetes-related quality of life (DQoL-Brief) survey. Safety indicators did not differ between groups. Participant satisfaction on the eight-item client satisfaction questionnaire (CSQ-8) was good in both groups, but scores were significantly higher in the Beacon model group than the usual care group (mean [SD] 28.4 [4.9] vs 25.6 [4.9], respectively, p < 0.001).

Conclusions/interpretation

In individuals with type 2 diabetes, a model of integrated care delivered in the community by GPs with a special interest can safely achieve clinical outcomes that are not inferior to those achieved with gold-standard hospital-based specialist outpatient clinics. Individuals receiving care in the community had greater satisfaction. Further studies will determine the cost of delivering this model of care.

Trial registration

Australian New Zealand Clinical Trials Registry ACTRN12612000380897

Funding

The study was funded by the Australian National Health and Medical Research Council (GNT1001157).

Keywords

General practitioners with special interest Integrated care Non-inferiority randomised controlled trial Primary–secondary model of care Type 2 diabetes 

Abbreviations

CSQ-8

Eight-item client satisfaction questionnaire

DBP

Diastolic BP

DNE

Diabetes nurse educator

DQoL-Brief

Diabetes-related quality of life

GP

General practitioner

GPwSI

General practitioner with a special interest

HADS

Hospital anxiety and depression scale

IDA

Insulin dose adjustment

QoL

Quality of life

SBP

Systolic BP

SF-12v2

12-item short-form health survey

Notes

Acknowledgements

The authors thank the clinical, administrative and managerial staff and participants at each of the study sites.

Contribution statement

CLJ, AWR and HDM worked on the original idea, searched the published scientific literature and designed the methods; they were also senior clinical leads for the study implementation and contributed to data interpretation as well as revising the manuscript. MD, SJB and AWR wrote the first draft of the manuscript. MD also managed the research process and contributed to data management and interpretation. SJB also updated literature searches, undertook the data collection and contributed to data interpretation and the preparation of tables and figures. JZ and LHB contributed to research management, data collection and writing. NB conducted the data analyses supervised by the senior statistician RSW and both revised the manuscript. All authors read and approved the final submitted version. AWR is the guarantor of this work and, as such, had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.

Funding

This research was funded by the Australian National Health and Medical Research Council (NHMRC) under the Centre of Research Excellence in Quality and Safety in Integrated Primary–Secondary Care (Grant ID: GNT1001157).

Duality of interest

The authors declare there is no duality of interest associated with this manuscript.

Supplementary material

125_2018_4740_MOESM1_ESM.pdf (73 kb)
ESM (PDF 73 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Anthony W. Russell
    • 1
    • 2
  • Maria Donald
    • 1
  • Samantha J. Borg
    • 1
  • Jianzhen Zhang
    • 1
  • Letitia H. Burridge
    • 1
  • Robert S. Ware
    • 3
  • Nelufa Begum
    • 1
  • H. David McIntyre
    • 1
  • Claire L. Jackson
    • 1
  1. 1.Faculty of Medicine, The University of Queensland, Level 8, Health Sciences Building, Royal Brisbane and Women’s HospitalHerstonAustralia
  2. 2.Department of Diabetes and EndocrinologyPrincess Alexandra HospitalBrisbaneAustralia
  3. 3.Menzies Health Institute QueenslandGriffith UniversityBrisbaneAustralia

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