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. 2024 Sep 7;64(10):360–368. doi: 10.2176/jns-nmc.2024-0017

Fig. 2.

Fig. 2

Progress of compound motor action potential.

Figure 2 shows the progress of CMAP. In the polyphasic group, the amplitude ratio of the CMAP (amplitude of CMAP of the affected side/amplitude of CMAP of the unaffected side) tended to improve gradually with time, whereas in the monophasic group, the amplitude ratio of the CMAP decreased on the seventh postoperative day, followed by gradual improvement (polyphasic group/monophasic group; preoperative, 87.8±37.9/81.0±31.6, P=0.54, 1 week postoperative, 93.6±40.5/69.3±28.5, P=0.03, 1 month postoperative, 98.9±57.9/71.1±34.0, P=0.06, 1 year postoperative, 98.9±57.9/71.1±34.0, P=0.06, 1 year postoperative, 98.1±29.2/84.2±30.1, P=0.14).