Improving Perception Threshold Tracking for Rapid Evaluation of Diabetic Peripheral Neuropathy.

Area of Science:

• Neurology
• Diabetology
• Biomedical Engineering

Background:

• Accurate assessment of diabetic peripheral neuropathy (DPN) is crucial for preventing complications.
• Current diagnostic methods for DPN have limitations in speed and comprehensive evaluation.
• Perception threshold tracking (PTT) is a promising novel approach for rapid DPN assessment.

Purpose of the Study:

• To compare the Psi method and the Method of Limits (MoL) for estimating perception thresholds in diabetic patients.
• To assess agreement, uncertainty, and stimulus efficiency between the Psi method and MoL.
• To evaluate the utility of PTT in differentiating large and small fiber dysfunction in DPN.

Main Methods:

• Forty-three participants with diabetes underwent nerve conduction studies, quantitative sensory testing, and PTT.
• PTT utilized patch and pin electrodes for large and small fiber activation, respectively.
• Perception threshold uncertainty was quantified as the inverse slope of psychometric functions.

Main Results:

• Perception thresholds were significantly higher with patch electrodes (2.5 mA) than pin electrodes (0.71 mA).
• The Psi method demonstrated lower uncertainty (0.80 mA) compared to MoL (2.0 mA).
• The Psi method achieved reliable estimation with only 30 stimuli, significantly fewer than MoL.

Conclusions:

• The Psi method is more efficient and less uncertain for estimating perception thresholds than MoL.
• Both methods showed similar group-level perception thresholds, but Psi offers superior individual assessment.
• The Psi method is recommended for future research and clinical application in DPN evaluation.