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Original article
Contemporary risk estimates of three HbA1c variables in relation to heart failure following diagnosis of type 2 diabetes
  1. Stanko Skrtic1,2,
  2. Claudia Cabrera1,
  3. Marita Olsson1,3,
  4. Volker Schnecke1,
  5. Marcus Lind2,4
  1. 1 AstraZeneca R&D, Mölndal, Sweden
  2. 2 Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
  3. 3 Mathematical Sciences, Chalmers University of Technology, Gothenburg, Sweden
  4. 4 Department of Medicine, NU-Hospital Group, Uddevalla Hospital, Sweden
  1. Correspondence to Dr Stanko Skrtic, AstraZeneca R&D Gothenburg, Mölndal SE-431 83, Sweden; stanko.skrtic{at}astrazeneca.com

Abstract

Background We evaluated the association between glycaemic control and the risk of heart failure (HF) in a contemporary cohort of persons followed after diagnosis of type 2 diabetes (T2D).

Methods and results Persons with T2D diagnosed between 1998 and 2012 were retrieved from the Clinical Practice Research Data Link in the UK and followed from diagnosis until the event of HF, mortality, drop out from the database due to any other reason, or the end of the study on 1 July 2015. The association between each of three different haemoglobin A1C (HbA1c) metrics and HF was estimated using adjusted proportional hazard models. In the overall cohort (n=94 332), the increased risk for HF per 1% (10 mmol/mol) increase in HbA1c was 1.15 (95% CI 1.13 to 1.18) for updated mean HbA1c, and 1.06 (1.04 to 1.07) and 1.06 (1.04 to 1.08) for baseline HbA1c and updated latest HbA1c, respectively. When categorised, the hazard risk (HR) for the updated mean HbA1c in relation to HF became higher than for baseline and updated latest HbA1c above HbA1c levels of 9%, but did not differ at lower HbA1c levels. The updated latest variable showed an increased risk for HbA1c <6% (42 mmol/mol) of 1.16 (1.07 to 1.25), relative category 6–7%, while the HRs for updated mean and baseline HbA1c showed no such J-shaped pattern.

Conclusions Hyperglycaemia is still a risk factor for HF in persons with T2D of similar magnitude as in earlier cohorts. Such a relationship exists for current glycaemic levels, at diagnosis and the overall level but the pattern differs for these variables.

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/

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