spinal failure啥意思？

Regardless of the advantages, it is important to be mindful of absolute and relative contraindications to regional techniques when selecting them for spine surgery. Most studies involving neuraxial anesthesia for spine patients have used these contraindications as exclusion criteria. Frequently cited contraindications include patient refusal, severe or multilevel spinal stenosis (risk of high block, difficulty predicting dose, spinal failure/difficult placement), history of seizures, intracranial hypertension, coagulopathy, infection at the needle site or systemic sepsis, hemodynamic instability and hypovolemia, near-complete or total myelographic block, and myelographic arachnoiditis. It is important to consider these contraindications prior to proceeding with neuraxial techniques for spine procedures.

无论优点如何，区域麻醉用于脊柱外科手术时，了解绝对和相对禁忌证非常重要。大多数涉及椎管内麻醉的脊柱患者的研究已使用这些禁忌证作为排除标准。常引用的禁忌证包括患者拒绝、严重或多节段椎管狭窄(高阻滞风险、剂量难以预测、穿刺失败/困难置管)、惊厥发作史、颅内高压、凝血障碍、穿刺部位感染或全身脓毒症、血流动力学不稳定和低血容量、近乎完全或完全脊髓造影阻滞，以及脊髓性蛛网膜炎。对脊柱手术的患者实施椎管内麻醉前考虑这些禁忌证很重要。

spinal failure啥意思？穿刺失败？谢谢