在存在恶性肿瘤的情况下，呼吸功能损害可能发生在肢体近端肌无力出现之前。

In the presence of malignancy, respiratory function may be compromised even when proximal limb muscles remain strong.

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组间并没有观察到显著区别，但在无传导阻滞症状的病人中，牵涉中位神经元的情况显著较少。近端肌无力也存在这种情况。

Few significant differences were seen between groups, but involvement of the median nerve was significantly less frequent in patients without conduction block. This was also true of proximal weakness.

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