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Related Experiment Videos

Motor pathway function in normoalbuminuric IDDM patients

H Andersen1, J F Nielsen, P L Poulsen

  • 1Department of Neurology, Aarhus University Hospital, Denmark.

Diabetologia
|October 1, 1995
PubMed
Summary

Long-term insulin-dependent diabetic patients show impaired motor pathway excitability, not central conduction time. This study highlights subtle neurological changes in diabetes without neuropathy.

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Area of Science:

  • Neuroscience
  • Endocrinology
  • Diabetology

Background:

  • Insulin-dependent diabetes mellitus (IDDM) can lead to long-term complications affecting the nervous system.
  • Normoalbuminuric IDDM patients, despite normal kidney function, may still exhibit subclinical neurological alterations.
  • Central motor pathways are crucial for voluntary movement and can be affected by metabolic diseases.

Purpose of the Study:

  • To investigate central motor pathway conduction time and excitability in long-term, normoalbuminuric IDDM patients.
  • To compare these parameters with age-, sex-, and height-matched healthy controls.
  • To determine if central motor pathway changes correlate with peripheral neuropathy, metabolic control, or diabetes duration.

Main Methods:

  • Utilized transcranial and spinal magnetic stimulation to assess central motor conduction time (CMCT) in the abductor pollicis brevis muscle.

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  • Employed paired transcranial magnetic stimulation at various intervals (30-1000 ms) to evaluate motor pathway excitability.
  • Compared CMCT and excitability measures between 17 normoalbuminuric IDDM patients and 17 control subjects.

    • Main Results:

    • Central motor conduction time was comparable between diabetic patients (9.8 ± 1.65 ms) and controls (10.1 ± 1.48 ms).
    • Diabetic patients exhibited impaired motor pathway excitability, evidenced by absent early facilitation and prolonged latencies at short interstimulation intervals (30-50 ms).
    • These excitability changes did not correlate with peripheral neuropathy, metabolic control, or diabetes duration.

    Conclusions:

    • Long-term normoalbuminuric IDDM patients possess normal central motor conduction times.
    • However, these patients demonstrate impaired excitability of the central motor pathways.
    • These findings suggest subclinical alterations in motor pathway function in diabetes that are independent of peripheral neuropathy and disease duration.