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Autonomic function testing in diabetic subjects using sequential measurements.

G P Lawrence1, P D Home, A Murray

  • 1Regional Medical Physics Department, Freeman Hospital, Newcastle upon Tyne, UK.

Diabetic Medicine : a Journal of the British Diabetic Association
|November 1, 1992
PubMed
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This study assessed the repeatability of autonomic function tests in diabetic patients. The deep breathing test, performed sitting with three cycles, showed better repeatability for heart rate variability.

Area of Science:

  • Cardiology
  • Autonomic Nervous System Research
  • Diabetes Complications

Background:

  • Autonomic dysfunction is a common complication of diabetes.
  • Electrocardiogram (ECG)-based autonomic function tests are frequently used to assess autonomic neuropathy.
  • Investigating the repeatability of these tests is crucial for reliable clinical assessment.

Purpose of the Study:

  • To evaluate the repeatability of commonly used ECG-related autonomic function tests in individuals with diabetes.
  • To compare the repeatability of different test protocols, including breathing techniques and postures.

Main Methods:

  • Twenty-five diabetic subjects underwent repeated autonomic function tests (deep breathing, Valsalva, postural changes) over two sessions.
  • Electrocardiogram (ECG) and respiratory data were collected to analyze RR intervals and heart rate.

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  • Within-subject standard deviation and repeatability-to-variability ratios were calculated.

    • Main Results:

    • The deep breathing test demonstrated better repeatability when performed sitting compared to supine.
    • Using three respiratory cycles for the deep breathing test yielded higher repeatability than a single cycle.
    • A significant correlation was observed between heart rate variability and air volume variability during deep breathing.

    Conclusions:

    • The deep breathing test, particularly when performed sitting with multiple respiratory cycles, offers reliable repeatability for assessing autonomic function in diabetics.
    • Optimized test protocols enhance the diagnostic value of ECG-based autonomic function tests in diabetes management.