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KMID : 0860920050070010034
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Journal of the Korean Association EMG-Electrodiagnostic Medicine
2005 Volume.7 No. 1 p.34 ~ p.39
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Effect of Disposable Surface Electrode Reuse on Parameters of Compound Muscle Action Potential
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Choi Deok-Hyung
Han Tai-Ryoon
Paik Nam-Jong
Lee Shi-Uk
Lee Kun-Jai
Park Il-Chan
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Abstract
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Objetives: To observe the change of parameters of compound muscle action potential (CMAP) according
to repeated reuse of disposable surface electrodes.
Methods: Disposable surface electrodes were used to obtain CMAP from the abductor pollicis
brevis(APB). The active and reference electrodes were attached and detached 100 times. CMAPs were
obtained initially and after attachment and detachment of disposable surface electrodes, which were
repeated 5, 10, 20, 25, 30, 40, 45, 50, 60, 65, 70, 80, 85, 90 and 100times. Each latency, amplitude, duration
and area of CMAPs were compared.
Results: Onset latency shortened significantly at 40 times (P<0.05). Maximum shortening value of
latency is 0.03msec at 85 times. Amplitude, duration and area decreased at 50 times, 20 times, and 45
times respectively. The maximum decline values were 0.34 mV (2.8%) at 85 times, 0.28 msec (5.1%) at
90 times, 1.87 mVsec(4.6%) at 80 times.
Conclusions: The differences between CMAP parameters at baseline and those after several use of electrodes
were very small, although statistically significant declines were observed. These small differences
will not confuse electrodiagnostic decision. So disposable surface electrodes can be repetitively used at
least 100 times. But if borderline values are observed, we recommend to change the electrodes to new
ones.
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KEYWORD
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Compound Muscle Action Potential, Disposable, Surface Electrodes, Electrodiagnosis
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