The purpose of this study is to compare the differences among neck muscle fatigue evaluation algorithms and to find a more effective algorithm which can provide a human factor quantitative evaluation method for neck muscle fatigue during bending over the desk. We collected surface electromyography signal of sternocleidomastoid muscle of 15 subjects using wireless physiotherapy Bio-Radio when they bent over the desk using memory pillows for 12 minutes. Five algorithms including mean power frequency, spectral moments ratio, discrete wavelet transform, fuzzy approximation entropy and the complexity algorithms were used to calculate the corresponding muscle fatigue index. The least squares method was used to calculate the corresponding coefficient of determination R2 and slope k of the linear regression of the muscle fatigue metric. The coefficient of determination R2 evaluates anti-interference ability of algorithms. The maximum vertical distance Lmax which is obtained by the Kolmogorov-Smirnov test for the slopes k evaluates the ability to distinguish fatigue of algorithms. The results indicate that in the aspect of anti-interference ability, the fuzzy approximation entropy has the largest R2 when using memory pillows with different heights. When the fuzzy approximate entropy is compared with average power frequency or the discrete wavelet transform, the differences are significant (P < 0.05). In terms of distinguishing the degree of fatigue, the approximate entropy is still the largest, with a maximum of 0.496 7. Fuzzy approximation entropy is superior to other algorithms in ability of anti-interference and distinguishing fatigue. Therefore, fuzzy approximation entropy can be used as a better evaluation algorithm in the evaluation of cervical muscle fatigue.
目的总结心脏移植和双肺移植供体心肺同时摘取的经验。 方法解放军第一八一医院心脏中心2012年完成3例同一供体心肺同时摘取，分别完成心脏移植和双肺移植各3例。3例供体为脑死亡，阻断供体升主动脉和主肺动脉后，同时灌注保护液，心脏保护应用组氨酸-色氨酸-酮戊二酸心脏停搏液（HTK液），肺保护应用低钾右旋糖酐液（LPD液）；供体心肺热缺血时间为5 min，供心冷缺血时间分别为252 min、323 min和375 min，供体肺冷缺血时间分别为610 min、679 min和738 min；3例心脏移植均采用双腔静脉吻合法，3例肺移植均采用序贯式双肺移植。 结果3例心脏移植均存活；肺移植2例存活，1例死亡。存活患者出院后生活质量良好，随访8～13个月未出现感染、急性排斥反应等并发症。 结论供体心肺同时摘取，同时灌注后分别修剪并再次灌注，分别保存运输，心脏移植和双肺移植可取得满意效果。