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Effect of mild hyperglycemia on autonomic function in obstructive sleep apnea

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Abstract

Introduction

Obstructive sleep apnea (OSA) has been hypothesized to cause a hypersympathetic state, which may be the mechanism for the increased incidence of cardiovascular disease in OSA. However, there is a high prevalence of hyperglycemia in OSA patients, which may also contribute to autonomic dysfunction.

Methods

Thirty-five patients with OSA and 11 controls with average body mass index (BMI) of 32.0 ± 4.6 underwent polysomnography, glucose tolerance testing, autonomic function tests, lying and standing catecholamines, overnight urine collection, and baseline ECG and continuous blood pressure measurements for spectral analysis. A linear regression model adjusting for age and BMI was used to analyze spectral data, other outcome measures were analyzed with Kruskal–Wallis test.

Results

Twenty-three OSA patients and two control patients had hyperglycemia (based on 2001 American Diabetes Association criteria). Apnea–hypopnea index (AHI) correlated with total power and low frequency (LF) power (r = 0.138, 0.177, p = 0.031; and r = 0.013) but not with the LF/high frequency (HF) ratio (p = 0.589). Glucose negatively correlated with LF systolic power (r = −0.171, p = 0.038) but not AHI (p = 0.586) and was marginally associated with pnn50, total power, LF, and HF power (p ranged from 0.07 to 0.08).

Conclusion

These data suggest that patients with OSA and mild hyperglycemia have a trend towards lower heart rate variability and sympathetic tone. Hyperglycemia is an important confounder and should be evaluated in studies of OSA and autonomic function.

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Acknowledgments

Supported by NIH 1K23 NS056009-01A1 (Peltier PI), Vanderbilt CTSA grant 1 UL1 RR024975. This work was also supported in part by National Institutes of Health grants 1PO1 HL56693.

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Correspondence to Amanda C. Peltier.

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Peltier, A.C., Bagai, K., Artibee, K. et al. Effect of mild hyperglycemia on autonomic function in obstructive sleep apnea. Clin Auton Res 22, 1–8 (2012). https://doi.org/10.1007/s10286-011-0131-9

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  • DOI: https://doi.org/10.1007/s10286-011-0131-9

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