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Electrodiagnostic reference data for motor nerve conduction studies in Saudi Arabia.

Mohammed H Alanazy1, Nuha M Alkhawajah, Moneera O Aldraihem

  • 1Division of Neurology, Department of Internal Medicine, King Saud University, Riyadh, Kingdom of Saudi Arabia.

Neurosciences (Riyadh, Saudi Arabia)
|January 27, 2020
PubMed
Summary

This study established nerve conduction studies (NCS) reference data for Saudi Arabian adults. Findings show comparable motor nerve and F-wave data to Western populations, with minor variations noted.

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Area of Science:

  • Neurology
  • Neurophysiology
  • Clinical Electrophysiology

Background:

  • Establishing normative data for nerve conduction studies (NCS) is crucial for accurate neurological diagnosis.
  • Existing NCS reference data primarily originates from Western populations, potentially limiting applicability in diverse ethnic groups.

Purpose of the Study:

  • To determine reference data for motor nerve conduction studies (NCS) and F-waves in the upper and lower limbs of healthy individuals in Saudi Arabia.
  • To compare these findings with established Western reference values.

Main Methods:

  • A cross-sectional study involving healthy Saudi subjects (127 upper limb, 137 lower limb).
  • Standardized motor NCS protocols were applied.
  • Pearson correlations analyzed relationships between NCS parameters and demographic factors (age, gender, height, weight, BMI).

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  • Percentile methods and quantile regression models were used to generate reference data.

    • Main Results:

    • Reference limits for distal motor latency (ms) and conduction velocity (m/s) were established for median, ulnar, tibial, and fibular nerves.
    • Specific values include: Median nerve (3.7 ms, 50 m/s), Ulnar nerve (3.3 ms, 50 m/s), Tibial nerve (5.8 ms, 40 m/s), Fibular nerve (5.0 ms, 40 m/s).
    • Compound muscle action potential amplitude and F-wave minimal latency were adjusted for age and height, respectively.

    Conclusions:

    • The generated reference data for motor NCS and F-wave minimal latency in Saudi subjects are largely comparable to Western data.
    • Minor differences were observed, highlighting potential ethnic variations.
    • Further research is recommended to address the underrepresentation of older age groups in the study cohort.