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Intensified insulin treatment is associated with improvement in skin microcirculation and ischaemic foot ulcer in patients with type 1 diabetes mellitus: a long-term follow-up study

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Abstract

Aims/hypothesis

We investigated skin microcirculation and its association with HbA1c and the incidence of ischaemic foot ulcer in patients with type 1 diabetes formerly randomised (1982–1984) to intensified conventional treatment (ICT) or standard treatment (ST) with insulin for a mean of 7.5 years.

Methods

We re-determined the skin microcirculation of 72 patients (ICT 35 vs ST 37) from the original Stockholm Diabetes Intervention Study with iontophoresis topically applied with the following vasoactive stimuli: acetylcholine (ACh) (endothelial-dependent vasodilatation), sodium nitroprusside (SNP) (endothelial-independent vasodilatation), and capsaicin (C-nociceptive-dependent vasodilatation). HbA1c levels (mean of 14 values/patient) were prospectively collected between 1990 and 1995 and tested for association with skin microcirculation. The patients were followed until first hospitalisation for an ischaemic foot ulcer or until 2011.

Results

During the median 28 years of follow-up, three patients developed ischaemic foot ulcers in the ICT group compared with ten in the ST group (logrank, p = 0.035). At the time of iontophoresis, HbA1c was lower in the ICT group (median 57 mmol/mol [minimum–maximum 40–79 mmol/mol]) compared with the ST group (68 mmol/mol [41–96 mmol/mol], p < 0.01) (DCCT: ICT 7.4% [5.8–9.4%] vs ST 8.4% [5.9–10.9%]). Stimulated blood flow was higher in the ICT vs ST group with significantly increased perfusion units (PU) for: ACh (8.1 PU [4.6–24.7 PU] vs 5.3 PU [1.7–21.4 PU], p < 0.01); SNP (8.1 PU [2.2–20.1 PU] vs 5.6 PU [2.3–19.2 PU], p = 0.03); and capsaicin (5.0 PU [1.7–22.9 PU] vs 3.4 PU [1.5–8.4 PU], p < 0.01). HbA1c was associated with vasodilatation induced by ACh (b = −0.02, p < 0.01) and capsaicin (b = −0.02, p = 0.03). HbA1c was independently associated with ACh (b = −1.48, p < 0.01) and capsaicin-induced vasodilatation (b = −1.45, p < 0.01).

Conclusions/interpretation

Improved glycaemic control in patients with type 1 diabetes is associated with an improvement in skin microcirculation and with a lower incidence of ischaemic foot ulcers.

Trial registration: ClinicalTrials.gov NCT01957930

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Abbreviations

ACh:

Acetylcholine

ICT:

Intensified conventional treatment

SNP:

Sodium nitroprusside

SDIS:

Stockholm Diabetes Intervention Study

ST:

Standard treatment

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Acknowledgements

We dedicate this paper to Per Reichard (Department of Clinical Science and Education, Division of Internal Medicine, Karolinska Institutet, Stockholm, Sweden), who died in 2002 and to whom we are greatly indebted. Per was a pioneer in the treatment of type 1 diabetes, guiding patients and colleagues to improve diabetes care.

In memory of Bertil Gazelius (Perimed, Järfälla, Sweden), who died in 1999, and Lars Erik Lindblad (Department of Clinical Science and Education, Section of Clinical Physiology, Karolinska Institutet, Stockholm, Sweden), who died in 2001.

We thank C. Ihrman-Sandahl (Stockholm Heart Center, Stockholm, Sweden) and M. Pihl (Department of Diabetes and Metabolism, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden) who performed the practical investigations. We thank L. Benson (Department of Clinical Science and Education, Karolinska Institutet, Stockholm, Sweden) for statistical advice.

Funding

This research received no specific grant from any funding agency in the public, commercial or not-for-profit sectors.

Duality of interest

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

Contribution statement

KJ-U conducted the iontophoresis and, together with Per Reichard (PR), analysed the data and drafted an earlier manuscript that was never published due to illness of PR. Other co-writers BR and TN planned the follow-up part of this study, and analysed all the data from the iontophoresis investigation and the long-term follow-up of the present study, and drafted the manuscript. All authors took part in revising the manuscript and gave final approval of the version to be published. TN is responsible for the integrity of the work as a whole.

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Correspondence to Thomas Nyström.

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Rathsman, B., Jensen-Urstad, K. & Nyström, T. Intensified insulin treatment is associated with improvement in skin microcirculation and ischaemic foot ulcer in patients with type 1 diabetes mellitus: a long-term follow-up study. Diabetologia 57, 1703–1710 (2014). https://doi.org/10.1007/s00125-014-3248-2

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