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Estimating Reference Limits for Motor Conduction Block Using Latency Adjustment and a Modified MeRef Model.

Thorbjørn S Engedal^1,2, Erisela Qerama^1,2, Jón Á Benediktsson¹

¹Department of Clinical Neurophysiology, Aarhus University Hospital, Aarhus, Denmark; and.

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society

|March 27, 2026

Summary

This summary is machine-generated.

New nerve conduction study (NCS) methods improve motor conduction block diagnosis by accounting for latency difference (LD). This multivariate model offers more accurate amplitude decay reference limits, reducing false positives and negatives in NCS.

Keywords:

AIDP CIDP Conduction block Inflammatory polyneuropathy Nerve conduction study Reference limits

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Area of Science:

Neurology
Neurophysiology
Biomedical Engineering

Background:

Current motor conduction block thresholds in nerve conduction studies (NCS) lack individual specificity.
Existing methods rely on expert opinion, potentially leading to diagnostic inaccuracies.

Purpose of the Study:

To enhance diagnostic accuracy for partial motor conduction block.
To investigate the impact of latency difference (LD) on amplitude decay in unaffected nerves.

Main Methods:

Developed a multivariate extrapolated truncated fit (METF) model.
Established reference limits for amplitude decay based on LD using a large dataset (67,266 investigations).
Compared METF limits with existing literature and conduction block thresholds.

Main Results:

Amplitude decay is influenced by LD, with increases of 1.7%–5.1% per ms increase in LD across four major nerves.
METF model provided specific upper limits for amplitude decay (e.g., Median nerve: 14.3%/24.1%).
Existing thresholds showed inconsistent results, risking false positives/negatives.

Conclusions:

Amplitude decay in NCS is significantly dependent on LD.
The METF model offers a robust tool for creating accurate, LD-adjusted reference limits.
LD-adjusted reference limits can improve the diagnosis of conditions involving conduction block, such as inflammatory polyneuropathies.