HP51 : Motor unit integrity in multifocal motor neuropathy: A systematic evaluation with CMAP scans

Effect of surface electrode recording area on compound muscle action potential scan processing for motor unit number estimation

“…Additionally, some researchers used 13 mm diameter disk electrodes to examine the FDI and abductor digiti minimi (ADM) muscles (Song et al, 2023). For the APB muscle examined in this study, literature shows that the surface electrode used for CMAP scan recording ranged from 10 mm to 15 mm in diameter (i.e., 79 mm 2 to 177 mm 2 ; Farschtschi et al, 2017;Stikvoort García et al, 2022;Zong et al, 2022c;Song et al, 2023). Square electrodes with different recording areas were reported for APB muscle CMAP scan recordings (Araújo et al, 2015;Sørensen et al, 2023).…”

“…Furthermore, inconsistent electrode recording areas were reported when examining the same muscle (Sleutjes et al, 2021). For example, when performing CMAP scan recordings on the abductor pollicis brevis (APB) muscle, square electrodes with the size of 30 mm × 22 mm (with the recording area of 474 mm 2 ) and 30 mm × 24 mm (detailed recording area was not reported) were used in Araújo et al (2015) and Sørensen et al (2023), respectively, while disk electrodes with the diameter of 10 mm (i.e., 79 mm 2 ) and 13 mm (i.e., 133 mm 2 ) were applied in Stikvoort García et al (2022) and Song et al (2023), respectively. Note that 2-dimensional electrode arrays up to 128 channels have also been used for MUNE, where electrodes with diameters smaller than 2 mm are commonly used (Sleutjes et al, 2016).…”