Operating factors

1. Epidural block is a blind exploratory puncture. For beginners, it is inevitable to penetrate the intervertebral ligament because they do not have a deep feeling of acupuncture at different levels.

2. When anesthesiologists puncture the needle too fast, or encounter bone and suddenly slip into;

3. Inappropriate use of instruments and appliances; The quality of the catheter increases the probability of penetrating the dura and is difficult to detect.

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