AI Article Synopsis
- The study aimed to create a reliable method to record the compound muscle action potential (CMAP) of the serratus anterior muscle by stimulating the long thoracic nerve in healthy volunteers.
- Participants underwent tests using specific electrode placements, measuring key outcomes like distal motor latency (DML) and CMAP amplitude.
- Results indicated no significant difference in DML and CMAP amplitude between sides, with a notable correlation found between participants' height and DML, supporting the technique's validation against existing motor nerve conduction studies.
Article Abstract
Objective: To design an electrodiagnostic technique by which to accurately record the serratus anterior compound muscle action potential (CMAP).
Design: Observational study.
Setting: Academic electromyography laboratory.
Participants: Fifteen healthy volunteers.
Interventions: The long thoracic nerve was stimulated by using a standard bipolar surface electrode in the axilla, just anterior to the midaxillary line. The serratus anterior CMAP was recorded by using a self-adhesive, 8.0 x 0.5 cm, ring electrode as the E1 placed across the serratus anterior interdigitations starting at the nipple level. A self-adhesive, motor (1 x 1 cm) electrode was used as E2 and placed over the seventh rib. A standard self-adhesive ground electrode was placed over the inferior region of the latissimus dorsi.
Main Outcome Measures: Distal motor latency (DML), and CMAP amplitude and duration.
Results: After removing 2 outliers, the results are reported as the mean +/- 1.96 standard deviations. Right long thoracic DML was 2.2+/-1.0ms and the left was 2.3+/-0.9ms, with a side-to-side mean difference of 0.3+/-0.4ms. The right serratus CMAP amplitude was 3.8+/-3.9mV and the left was 3.9+/-3.7mV, with a side-to-side mean difference of 0.6+/-1.2mV. Statistical analysis did not reveal a significant side-to-side difference for DML or CMAP amplitude. Both sides were combined to form a single set of trials for DML and CMAP amplitude. The mean DML became 2.2+/-0.7ms, and the CMAP amplitude was 3.5+/-1.9mV. The CMAP duration was 14.5+/-4.3ms on the right and 14.5+/-4.1ms on the left. A significant, positive correlation existed between height and DML ( P <.02). The 95% confidence intervals for DML and CMAP amplitudes were 2.1 to 2.5ms and 1.5 to 3.1mV, respectively.
Conclusions: Our latency, side-to-side comparisons and amplitude data were consistent with other motor nerve conduction findings in the literature. Stimulating the long thoracic nerve in the axilla will provide a reliable technique to aid in the diagnosis and treatment of long thoracic neuropathy.
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| http://dx.doi.org/10.1016/j.apmr.2004.04.050 | DOI Listing |
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