Proper training and use of ultrasonography facilitates lumbar puncture
© The Author(s). 2017
Received: 13 July 2017
Accepted: 11 December 2017
Published: 20 December 2017
With great interest, we read the study of Line Dussourd et al. concluding that ultrasonography allows better identification of anatomical structures before performing a lumbar puncture. We cannot concur with the conclusions of the study because the authors did not visualize the conus medullaris directly, nor did they assess the individual intervertebral levels. In our commentary, we make some suggestions for improvement using ultrasound to locate the optimal site for a lumbar puncture. We do agree that neuraxial ultrasound is of great benefit for the performance of lumbar punctures. Proper training and applying the correct technique, however, is necessary for obtaining all benefits ultrasonography offers.
To the editor:
With interest, we read the article of Dussourd et al. . Although we agree with their conclusion that ultrasonography allows better identification of anatomical structures before lumbar puncture, we cannot concur with their statement that ultrasound identified the best lumbar puncture site under the conus medullaris. The authors did not visualize the conus medullaris directly, nor did they assess the individual intervertebral levels.
To improve the accuracy of intervertebral space identification in preparation for a lumbar puncture a pre-procedure spinal ultrasound scan should be performed identifying the individual intervertebral levels. This may be performed by counting spinous processes or laminae upward from the sacrum. Using this method, ultrasound may accurately identify the correct intervertebral space in 76% of the cases .
Moreover, identifying a lumbar interlaminar space is not easy and it is hard to achieve competency in all aspects of spinal ultrasonography . Trainees in anesthesiology were only considered competent after performing 60 supervised scans. Therefore, we doubt whether the participating emergency physicians obtained all necessary skills to successfully identify the correct lumbar intervertebral space after a training which did not exceed 30 min.
Neuraxial ultrasound improves the efficacy of neuraxial techniques. A recent meta-analysis showed the combined risk ratio of technical failure in lumbar neuraxial procedures was 0.51 (95% CI, 0.32–0.80) when ultrasound guidance is used compared to palpation. In addition, ultrasound guidance results in a lower number of needle passes required for success .
In conclusion, we do agree that neuraxial ultrasound is of great benefit for the performance of lumbar punctures. Proper training and applying the correct technique, however, is necessary for obtaining all benefits ultrasonography offers.
Geert-Jan van Geffen,
No funding was received for this commentary. The department of anesthesiology employing all authors paid for the article processing charges.
Availability of data and materials
Data sharing not applicable to this article as no datasets were generated or analyzed during the current study.
GJvG conceived the commentary. All three authors (GJvG; RK; JB) contributed equally to the writing of the manuscript. All authors read and approved the final manuscript.
Ethics approval and consent to participate
Consent for publication
The authors declare that they have no competing interests.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
- Dussourd L, Martinon B, Candille C, Paquier C, Wintenberger C, Dumanoir P, et al. Ultrasonography helps emergency physician identify the best lumbar puncture site under the conus medullaris. Scand J Trauma Resusc Emerg Med. 2017;25:60.View ArticlePubMedPubMed CentralGoogle Scholar
- Watson MJ, Evans S, Thorp JM. Could ultrasonography be used by an anaesthetist to identify a specified lumbar interspace before spinal anaesthesia? Br J Anaesth. 2003;90:509–11.View ArticlePubMedGoogle Scholar
- Deacon AJ, Melhuishi NS, Terblanche NC. CUSUM method for construction of trainee spinal ultrasound learning curves following standardised teaching. Anaesth Intensive Care. 2014;42:480–6.PubMedGoogle Scholar
- Perlas A, Chaparro LE, Chin KJ. Lumbar Neuraxial ultrasound for spinal and epidural anesthesia: a systematic review and meta-analysis. Reg Anesth Pain Med. 2016;41:251–60.View ArticlePubMedGoogle Scholar