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J Korean Assoc EMG Electrodiagn Med 2005;7(1):34-39.
Published online May 10, 2005.
Effect of Disposable Surface Electrode Reuse on Parameters of Compound Muscle Action Potential
Abstract
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.
Key Words: Compound Muscle Action Potential, Disposable, Surface Electrodes, Electrodiagnosis


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