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A field method for blink reflex latency R-1 (BRL R-1) and prediction equations for adults and children
K H Kilburn1, J C Thornton, B Hanscom
1Environmental Sciences Laboratory, University of Southern California School of Medicine, Los Angeles, USA.
Electromyography and Clinical Neurophysiology
|April 9, 1998
Summary
A new apparatus for blink reflex latency R-1 (BRL R-1) measurement is field-worthy and provides identical results to electrical stimulation. This standardized method allows for population-based prediction equations for BRL R-1.
Area of Science:
- Neuroscience
- Biomedical Engineering
Background:
- Blink reflex latency R-1 (BRL R-1) measurement is crucial for neurological assessments.
- Standardized and field-worthy methods are needed for reliable BRL R-1 assessment.
- Existing methods may be influenced by environmental factors.
Purpose of the Study:
- To develop a field-worthy apparatus for blink reflex latency R-1 (BRL R-1) measurement.
- To compare mechanical and electrical stimulation for BRL R-1 elicitation.
- To establish standardized measurement procedures and population-based prediction equations for BRL R-1.
Main Methods:
- A novel, low-voltage electromyographic (EMG) system, immune to electromagnetic interference, was constructed.
- Supraorbital notches were stimulated mechanically (hammer) and electrically (2.0 ms, 2-5 mA).
- A computer program standardized R-1 measurement by baseline subtraction and noise envelope analysis.
Main Results:
- Mean BRL R-1 was consistent between mechanical and electrical stimulation (approx. 12.6 ms).
- In adults, BRL R-1 showed age dependency.
- In children, BRL R-1 was dependent on age, weight, and height.
Conclusions:
- Supraorbital tap elicits a field-worthy, computer-defined BRL R-1.
- Mechanical stimulation provides results identical to electrical stimulation for BRL R-1.
- The developed method enables standardized BRL R-1 assessment and population-based predictions.