The major failure causes included technical difficulties, vasovagal reactions, the absence of a distinct trigger zone, and no analgesia induced by procaine test.

失败的主要原因包括：卵圆孔穿刺技术，迷走神经反应，无扳机点，普鲁卡因测试不能达到完全不痛。

youdao

The major failure causes included puncture muff, severe vasovagal reactions, the absence of a distinct trigger zone and incomplete analgesia after the procaine test.

失败的主要原因包括卵圆孔穿刺失误，迷走神经反应，无扳机点和普鲁卡因测试不能达到完全不痛。

youdao

The major failure causes included puncture muff, severe vasovagal reactions, the absence of a distinct trigger zone and incomplete analgesia after the procaine test.

失败的主要原因包括卵圆孔穿刺失误，迷走神经反应，无扳机点和普鲁卡因测试不能达到完全不痛。

youdao