Articles: nerve-block.
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McCombe and Bogod report on their analysis of 55 medicolegal claims relating to obstetric neuraxial anaesthesia and analgesia.
Why is this important?
Not only is neurological injury the second most common reason for obstetric anaesthetic claims (behind inadequate regional anaesthesia resulting in pain during Caesarean section), the average claim cost is greater.
McCombe and Bogod provide a factful exploration of many of the causes of neurological complications.
Which themes emerged from their analysis?
- Consent, particularly around providing inadequate pre-procedure information of the risk of neurological injury1 and the challenges, medical and legal, to achieving informed consent.
- Nerve injury and it's mechanisms: non-anaesthetic causes2, direct trauma, chemical, and compression (abscess, haematoma).
- Complication recognition & management means timely follow-up and assessment, and maintaining a high index of suspicion for abnormalities. Remember the 4 hour rule: blocks should be regressing 4 hours after the last dose.
Important reminders
The level of spinal cord termination varies a lot among individuals, as does the level of Tuffier's line3. Considering the inaccuracy of spinal level identification by anaesthetists, there is a lot of potential to place a needle higher than expected.
Bottom-line: the intrathecal space should be accessed at the lowest possible level, and "the L2/3 interspace should not be an option."
And never allow chlorhexidine to contaminate gloves, the sterile workspace or neuraxial equipment.
summary
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Noting from NAP3 the risk of nerve injury ranges from, temporary injury 1:1,000, prolonged (>6 months) 1:13,000, to severe (including paralysis) 1:250,000. ↩
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'Obstetric palsy' (pelvic nerve compression) estimated by Bromage as occurring in 1:3000 deliveries; arterial obstruction & ischaemia 1:15,000; AV malformations 1:20,000. A prospective French study found postpartum neuropathy in 0.3%, 84% were femoral, and 69% resolved at 6 weeks. ↩
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Although generally accepted as being at the L4/5 interspace, in up to 50% of people the intercristal line might be at or above L2/3! ↩
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Acute pain represents one of the most common reasons for emergency department (ED) visits. In the opioid epidemic that North America faces, there is a significant demand for novel effective pain control modalities, especially in the acute setting. ⋯ ESPB is an easy-to-administer interfascial plane block that has several indications and promising potential for acute pain management in the ED. The easily identified landmarks coupled with its low complication rate makes it an appealing technique to be used by emergency physicians in the context of acute pain management. Further studies should investigate any other possible indications and compare its efficacy with other techniques, such as epidurals and serratus anterior blocks.
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Korean J Anesthesiol · Apr 2020
Randomized Controlled TrialUltrasound guided bilateral quadratus lumborum block vs. intrathecal morphine for postoperative analgesia after cesarean section: a randomised controlled trial.
Adequate pain control after cesarean section (CS) is crucial for mothers caring for newborns, and early ambulation to avoid thromboembolism and chronic abdominal and pelvic pain. This randomized controlled trial compared the efficacy of quadratus lumborum block (QLB) and intrathecal morphine (ITM) for analgesia after CS. ⋯ QLB and ITM are effective analgesic regimens after CS. However, QLB provides better long-lasting analgesia and reduced total postoperative morphine consumption.
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Korean J Anesthesiol · Apr 2020
Case ReportsContinuous quadratus lumborum block as part of multimodal analgesia after total hip arthroplasty: a case report.
Commonly used epidural or systemic analgesics for pain control after hip surgery carry risk for potential adverse effects. In contrast, the quadratus lumborum block (QLB) utilizes a simple and easy fascial plane technique and provides a wide area of sensory blockade. Thus, the QLB may be beneficial as analgesia after total hip arthroplasty. ⋯ Transmuscular QLB may be a suitable option for multimodal analgesia after total hip arthroplasty.
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Occipital nerve block (ONB) is an effective procedure for treating occipital headache pain. However, traditional suboccipital approaches to ONB remain underutilized in acute and chronic settings. An alternative location for ONB is the superior nuchal line, where anatomic studies show a reliable relationship between the occipital artery (OA) and greater occipital nerve. This study evaluated the efficacy and validity of an alternative, single skin insertion, paresthesia-based approach to block both the greater and lesser occipital nerve. ⋯ The results suggest that this alternative approach to ONB effectively reduces occipital headache pain and reliably predicts OA pulse and related greater occipital nerve location as confirmed by paresthesia.