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Related Experiment Videos

QTc interval, and autonomic and somatic nerve function in diabetic neuropathy

H Katsuoka1, Y Mimori, K Kurokawa

  • 1Third Department of Internal Medicine, Hiroshima University School of Medicine, Japan.

Clinical Autonomic Research : Official Journal of the Clinical Autonomic Research Society
|July 4, 1998
PubMed
Summary

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The corrected QT (QTc) interval is a useful indicator for diabetic neuropathy. This study found longer QTc intervals in diabetic patients, suggesting autonomic dysfunction.

Area of Science:

  • Cardiology
  • Neurology
  • Endocrinology

Background:

  • Diabetic neuropathy is a common complication of diabetes mellitus.
  • Autonomic dysfunction often accompanies diabetic neuropathy.
  • Accurate assessment of autonomic function is crucial for managing diabetic complications.

Purpose of the Study:

  • To evaluate the corrected QT (QTc) interval as a simple and useful indicator of autonomic dysfunction in patients with non-insulin-dependent diabetes mellitus and neuropathy.
  • To compare a novel QTc calculation method with Bazett's equation.
  • To explore correlations between QTc interval and various autonomic and somatic nervous system function parameters.

Main Methods:

  • Sixty-six patients with non-insulin-dependent diabetes mellitus and neuropathy underwent electrocardiogram (ECG) for QTc interval measurement.

Related Experiment Videos

  • Autonomic function tests including R-R interval variation, skin blood flow, blood pressure response to standing, and sympathetic skin response were performed.
  • A modified QTc calculation formula was compared to Bazett's equation.
  • Nerve conduction studies were conducted.

    • Main Results:

    • The modified QTc calculation method showed less overcompensation compared to Bazett's equation.
    • QTc intervals were significantly longer in diabetic patients compared to age-matched controls.
    • QTc interval demonstrated an inverse correlation with R-R interval variation and resting skin blood flow.
    • No significant correlation was found between QTc interval and blood pressure changes, heart rate response to standing, sympathetic skin response, or nerve conduction parameters.

    Conclusions:

    • The corrected QT (QTc) interval is a simple and valuable indicator for assessing autonomic dysfunction in diabetic neuropathy.
    • QTc interval measurements appear relatively independent of other autonomic and somatic nervous system abnormalities in this patient group.
    • The findings suggest QTc interval monitoring could aid in the management of diabetic neuropathy.