Podnar Simon
Institute of Clinical Neurophysiology, Division of Neurology, University Medical Center Ljubljana, SI-1525 Ljubljana, Slovenia.
Muscle Nerve. 2003 Sep;28(3):377-9. doi: 10.1002/mus.10417.
Electromyographic examination of the deeper external anal sphincter (EAS) muscle is far more uncomfortable than of the subcutaneous muscle, so we tested the need for its examination. We compared the findings in 85 paired examinations of ipsilateral subcutaneous and deeper EAS muscles in 67 patients with a cauda equina lesion. When the other muscle was normal, the deeper or subcutaneous muscle was pathological in 18% or 13% of pairs, respectively. In addition, the subcutaneous EAS muscle was usually more severely affected than the deeper EAS muscle. Thus, examination of the deeper EAS muscle did not increase the sensitivity of MUP analysis significantly, and did not seem clinically necessary.
对肛门外括约肌（EAS）深层肌肉进行肌电图检查比皮下肌肉检查要难受得多，因此我们测试了是否有必要进行该项检查。我们比较了67例马尾神经损伤患者同侧皮下和EAS深层肌肉的85对配对检查结果。当另一块肌肉正常时，深层或皮下肌肉分别在18%或13%的配对中出现病理改变。此外，皮下EAS肌肉通常比深层EAS肌肉受影响更严重。因此，对EAS深层肌肉的检查并没有显著提高运动单位电位（MUP）分析的敏感性，而且在临床上似乎没有必要。
