Autonomic Dysfunction Predicts Diabetic Foot Ulcers

NewsBot · Mar 26, 2016

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Cardiovascular Autonomic Dysfunction Predicts Diabetic Foot Ulcers in Patients With Type 2 Diabetes Without Diabetic Polyneuropathy.
Yun JS, Cha SA, Lim TS, Lee EY, Song KH, Ahn YB, Yoo KD, Kim JS, Park YM, Ko SH.
Medicine (Baltimore). 2016 Mar;95(12):e3128.

We investigated the factors that might influence the development of diabetic foot ulcers (DFUs) in type 2 diabetes patients without diabetic polyneuropathy (DPN).From January 2000 to December 2005, a total of 595 patients who had type 2 diabetes without DPN between the ages of 25 and 75 years, and had no prior history of DFUs were consecutively enrolled in the study. A cardiovascular autonomic function test was performed to diagnose cardiovascular autonomic neuropathy (CAN) using heart rate variability parameters.The median follow-up time was 13.3 years. Among the 449 (75.4%) patients who completed the follow-up evaluation, 22 (4.9%) patients developed new ulcers, and 6 (1.3%) patients underwent the procedure for lower extremity amputations. The patients in the DFUs group had a longer duration of diabetes, higher baseline HbA1c levels, higher rates of nephropathy, and CAN. A Cox hazard regression analysis results revealed that the development of DFUs was significantly associated with the presence of CAN (normal vs definite CAN; HR, 4.45; 95% confidence interval, 1.29-15.33) after adjusting for possible confounding factors.The development of DFUs was independently associated with CAN in patients with type 2 diabetes without DPN. We suggested the importance of CAN as a predictor of DFUs even in the patients without DPN, and the need to pay attention to patients with definite CAN and type 2 diabetes.
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NewsBot · Jul 4, 2020

Cardiac Autonomic Neuropathy Is Associated With Improved Diabetic Foot Ulcer Healing: A Single Centre Prospective Cohort Study
Frederick Farrow et al
Exp Clin Endocrinol Diabetes. 2020 Jul 2

Aims: People with diabetes and peripheral neuropathy (DPN) are at high risk of diabetic foot ulceration (DFU). The prevalence of cardiac autonomic neuropathy (CAN) in people with DFU is unknown and if CAN influences DFU healing is unclear.

Methods: We investigated, in a prospective observational single-centre cohort study, if CAN predicts DFU healing in 47 (77% male) people with a DFU and DPN attending a university hospital foot clinic. CAN was diagnosed by 2 or more abnormal Ewing's tests. Baseline DFU severity was evaluated using the site, ischaemia, neuropathy, bacterial infection, area and depth (SINBAD) score. The primary outcome was defined as evidence of DFU healing on clinical examination. Median (interquartile) length of follow-up was 1150 (624-1331) days.

Results: The prevalence of CAN was 43%. Of the cohort, 70% had complete healing of their DFU. Participants with CAN had a shorter median (interquartile) duration time to heal compared to those without CAN [91 (44-164) days compared to 302 (135-413) (p=0.047)]. Minor/major amputation and mortality was similar in both groups. The presence of CAN increased DFU healing by two-fold [HR=2.05, 95% CI 1.01-4.16, p=0.046] in multivariable competing risk analyses.

Conclusions: We demonstrate a high prevalence of CAN in a DFU cohort and that CAN is associated with improved DFU healing. The results of this study establish the scientific rationale for further studies to better understand the mechanisms between CAN and DFU outcomes.
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