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Autonomic control during acute hypoglycemia in type 1 diabetes mellitus

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Abstract

Purpose

We hypothesized that adults with type 1 diabetes mellitus (T1DM) would exhibit impaired heart rate variability (HRV), QT interval, T-wave amplitude, and baroreflex sensitivity (BRS) when compared with healthy controls. In addition, we hypothesized that acute hypoglycemia would result in further adverse changes in measures of autonomic and cardiovascular function.

Methods

A single 180-min hyperinsulinemic (2 mU/kg TBW/min), hypoglycemic (~3.3 umol/mL) clamp was completed in 10 healthy adults and 13 adults with T1DM. Counterregulatory hormones were assessed and measures of heart rate (electrocardiogram) and blood pressure (intra-arterial catheter or finger photoplethysmography) were analyzed at baseline and during the hypoglycemic clamp for measures of HRV, QT interval, T-wave amplitude, and spontaneous cardiac BRS (sCBRS).

Results

Baseline measures of HRV, sCBRS, and T-wave amplitude were blunted in adults with T1DM when compared with healthy controls. Hypoglycemia resulted in significant reductions in HRV, sCBRS, and T-wave amplitude and prolonged QT intervals; these changes were not different between adults with T1DM and healthy controls.

Conclusions

Results from the current study show that adults with T1DM exhibit impaired autonomic and cardiovascular function. Additionally, novel findings highlight an effect of acute hypoglycemia to further reduce measures of autonomic and cardiovascular function similarly between adults with T1DM and healthy controls. These results suggest that acute hypoglycemia may worsen impairments in autonomic and cardiovascular control in patients with T1DM, thus increasing the risk of ventricular arrhythmias and cardiovascular mortality.

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Acknowledgments

Our deepest appreciation and thanks to Dr. Robert Rizza for his valuable and constructive suggestions with study design. The authors also wish to thank Drs. Timothy Curry and John Eisenach (Department of Anesthesiology) for placement of brachial artery catheters. The authors further wish to acknowledge the contributions of the nursing and technical staff: Cheryl Shonkwiler, Barbara Norby, Shelly Roberts, Karen Krucker, Sarah Wolhart, Jean Knutson, Brent McConahey, Pamela Reich, Nancy Meyer, Pam Engrav, and Christopher Johnson of the Mayo Clinic. In addition, we thank the Clinical Research Unit staff at Mayo Clinic, the Immunochemical Core Laboratory at Mayo Clinic, in particular Hilary Blair. We are deeply indebted to our research participants. We thank Brandon Bucher and Brenton Nelson at ADinstruments for the development of the Spontaneous Cardiac Baroreflex Analysis Program. Funding sources: NIH DK090541 (MJJ, RB), NIH NS32352 (MJJ), NIH T32 DK07352 (EAW, JKL), NIH F32 DK84624 (EAW), NIH 1 UL1 RR024150 (Mayo Clinic CTSA, MJJ), and NIH DK29953 (RB).

Conflict of interest

The authors have no conflicts of interest and there are no concurrent submissions.

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Correspondence to Jacqueline K. Limberg.

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Limberg, J.K., Farni, K.E., Taylor, J.L. et al. Autonomic control during acute hypoglycemia in type 1 diabetes mellitus. Clin Auton Res 24, 275–283 (2014). https://doi.org/10.1007/s10286-014-0253-y

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  • DOI: https://doi.org/10.1007/s10286-014-0253-y

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