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Association between impaired cardiovascular autonomic function and hypoglycemia in patients with type 1 diabetes

Mamta Jaiswal1, Katherine McKeon2, Nicholas Comment3

  • 1Department of Neurology, University of Michigan, Ann Arbor, MI.

Diabetes Care
|June 29, 2014
PubMed

Insights

High glycemic variability (GV) and hypoglycemic stress in type 1 diabetes are linked to reduced heart rate variability (HRV), indicating cardiovascular autonomic dysfunction. This association persists even with good HbA1c control.

Area of Science:

  • Endocrinology
  • Cardiology
  • Diabetology

Background:

  • Glycemic variability (GV) reflects glucose fluctuations and is associated with diabetes complications.
  • Cardiovascular autonomic neuropathy (CAN) is a common complication in type 1 diabetes (T1D).
  • Understanding the link between GV and autonomic function is crucial for T1D management.

Purpose of the Study:

  • To investigate the association between GV, particularly hypoglycemic stress, and cardiovascular autonomic function in individuals with T1D.
  • To assess if GV impacts heart rate variability (HRV) in T1D patients.

Main Methods:

  • Pilot study involving 44 T1D patients without cardiovascular complications.
  • GV was assessed using continuous glucose monitoring (CGM) to calculate low blood glucose index (LBGI) and area under the curve (AUC) for hypoglycemia.
  • Cardiovascular autonomic function was evaluated using standardized cardiovascular reflex testing and HRV analysis.

Main Results:

  • Both LBGI and AUC for hypoglycemia showed a significant negative association with low-frequency and high-frequency power of HRV.
  • These inverse relationships remained significant after adjusting for hemoglobin A1c (HbA1c).
  • The associations were attenuated but persisted after multivariable adjustments for age and diabetes duration.

Conclusions:

  • Increased GV, especially hypoglycemic stress, is independently associated with reduced HRV in T1D patients.
  • These findings suggest that GV may contribute to cardiovascular autonomic dysfunction.
  • Further research is warranted to explore GV as a therapeutic target in T1D.
Abstract

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