1
|
Mejia J, Goffin P, Reina MA, Sala-Blanch X. No evidence of fascicular injury following a low-volume intraneural injection of the median nerve: a cadaveric study. Reg Anesth Pain Med 2024:rapm-2024-105294. [PMID: 38418409 DOI: 10.1136/rapm-2024-105294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 02/15/2024] [Indexed: 03/01/2024]
Abstract
BACKGROUND The test dose or hydrolocation technique allows rapid detection of spread location. Though its primary aim is to enhance safety in peripheral nerve blocks, evidence on the potential risks of an intraneural test aliquot is lacking. We conducted a cadaveric study to evaluate the risk of fascicular injury following a low-volume (<1 mL) intraneural injection of the median nerve. METHODS Ten upper limbs from fresh unembalmed human cadavers were studied. In-plane ultrasound-guided intraneural injections of the median nerve were performed at mid, proximal, and distal locations using 1 mL of methylene blue and heparinized blood solution. Nerves were extracted and samples immersed in 10% buffered formalin for 4 weeks. Perpendicular 3 mm slices were obtained for H&E staining and light microscopy analysis. Our main objective was to assess the number of injured fascicles. Secondarily, we evaluated the pattern of intraneural spread. Fascicular injury was defined as the presence perineurium or axonal disruption and/or the presence of erythrocytes inside a nerve fascicle. RESULTS Thirty injections were performed in 10 median nerves. Sonographic swelling was confirmed in 100% of the cases. 352 histological sections were analyzed to assess study outcomes. The mean number of fascicles on each section of median nerve was 20±6 covering 49%±7% of the nerve area. No evidence of axonal disruption nor intra-fascicular erythrocytes was found in any of the analyzed sections. CONCLUSIONS Low-volume intraneural injections do not result in evident fascicular injury. Our findings support the use of a test dose in ultrasound-guided regional anesthesia.
Collapse
Affiliation(s)
- Jorge Mejia
- Anesthesiology, Hospital Clinic de Barcelona, Barcelona, Spain
| | - Pierre Goffin
- Anesthesia and Intensive Care, CHC de Liège, Liège, Belgium
| | - Miguel A Reina
- Department of Anesthesiology, CEU San Pablo University Faculty of Medicine, Madrid, Spain
- University of Florida College of Medicine, Gainesville, FL, USA
| | - Xavier Sala-Blanch
- Anesthesiology, Hospital Clinic de Barcelona, Barcelona, Spain
- Human Anatomy and Embryology, University of Barcelona Faculty of Medicine, Barcelona, Spain
| |
Collapse
|
2
|
Goffin P, Mejia J, Prats-Galino A, Morales L, Panzeri M, Sala-Blanch X. Ultrasound is better than injection pressure monitoring detecting the low-volume intraneural injection. Reg Anesth Pain Med 2022; 47:rapm-2022-103759. [PMID: 35944936 DOI: 10.1136/rapm-2022-103759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 07/27/2022] [Indexed: 11/04/2022]
Abstract
INTRODUCTION Inadvertent intraneural injection is not infrequent during peripheral nerve blocks. For this reason, injection pressure monitoring has been suggested as a safeguard method that warns the clinician of a potentially hazardous needle tip location. However, doubts remain whether it is superior to the sonographic nerve swelling in terms of earlier detection of the intraneural injection. METHODS An observational cadaveric study was designed to assess injection pressures during an ultrasound-guided intraneural injection of the median nerve. We hypothesized that the evidence of nerve swelling occurred prior to an elevated injection pressure (>15 pound per square inch) measured with a portable in-line monitor. 33 ultrasound-guided intraneural injections of 11 median nerves from unembalmed human cadavers were performed at proximal, mid and distal forearm. 1 mL of a mixture of local anesthetic and methylene blue was injected intraneurally at a rate of 10 mL/min. Following injections, specimens were dissected to assess spread location. Video recordings of the procedures including ultrasound images were blindly analyzed to evaluate nerve swelling and injection pressures. RESULTS 31 injections were considered for analysis (two were excluded due to uncertainty regarding needle tip position). >15 pound per square inch was reached in six injections (19%) following a median injected volume of 0.6 mL. Nerve swelling was evident in all 31 injections (100%) with a median injected volume of 0.4 mL. On dissection, spread location was confirmed intraneural in all injections. DISCUSSION Ultrasound is a more sensitive and earlier indicator of the low-volume intraneural injection than injection pressure monitoring.
Collapse
Affiliation(s)
- Pierre Goffin
- Masters Degree in Advanced Medical Skills. Regional Anesthesia Based on Human Anatomy, University of Barcelona, Barcelona, Barcelona, Spain
- Anesthesia and Intensive Care, MontLégia Hospital, Groupe Santé CHC, Liège, Belgium
| | - Jorge Mejia
- Human Anatomy and Embryology, Universitat de Barcelona, Barcelona, Spain
| | - Alberto Prats-Galino
- Human Anatomy and Embryology, University of Barcelona Faculty of Medicine, Barcelona, Spain
| | - Lorena Morales
- Masters Degree in Advanced Medical Skills. Regional Anesthesia Based on Human Anatomy, University of Barcelona, Barcelona, Barcelona, Spain
| | - Miriam Panzeri
- Human Anatomy and Embryology, Universitat de Barcelona, Barcelona, Spain
| | - Xavier Sala-Blanch
- Human Anatomy and Embryology, Universitat de Barcelona, Barcelona, Spain
- Human Anatomy and Embryology, University of Barcelona Faculty of Medicine, Barcelona, Spain
| |
Collapse
|
3
|
Symanski JS, Ross AB, Davis KW, Brunner MC, Lee KS. US for Traumatic Nerve Injury, Entrapment Neuropathy, and Imaging-guided Perineural Injection. Radiographics 2022; 42:1546-1561. [PMID: 35776677 DOI: 10.1148/rg.210152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
US is commonly performed to help diagnose traumatic peripheral nerve injury and entrapment neuropathy, particularly with superficial nerves, where higher spatial resolution provides an advantage over MRI. Other advantages of US include dynamic evaluation, easy contralateral comparison, fewer implant contraindications, less artifact from ferromagnetic debris, and facile needle guidance for perineural injections. The authors review peripheral nerve US for traumatic peripheral nerve injury with an emphasis on injury grading and entrapment neuropathy and describe best-practice techniques for US-guided perineural injections while highlighting specific techniques and indications. Online supplemental material is available for this article. ©RSNA, 2022.
Collapse
Affiliation(s)
- John S Symanski
- From the Department of Radiology, University of Wisconsin Hospital and Clinics, 600 Highland Ave, Madison, WI 53792 (J.S.S., A.B.R., K.W.D., M.C.B., K.S.L.); and Department of Radiology, William S. Middleton Veterans Hospital, Madison, Wis (M.C.B.)
| | - Andrew B Ross
- From the Department of Radiology, University of Wisconsin Hospital and Clinics, 600 Highland Ave, Madison, WI 53792 (J.S.S., A.B.R., K.W.D., M.C.B., K.S.L.); and Department of Radiology, William S. Middleton Veterans Hospital, Madison, Wis (M.C.B.)
| | - Kirkland W Davis
- From the Department of Radiology, University of Wisconsin Hospital and Clinics, 600 Highland Ave, Madison, WI 53792 (J.S.S., A.B.R., K.W.D., M.C.B., K.S.L.); and Department of Radiology, William S. Middleton Veterans Hospital, Madison, Wis (M.C.B.)
| | - Michael C Brunner
- From the Department of Radiology, University of Wisconsin Hospital and Clinics, 600 Highland Ave, Madison, WI 53792 (J.S.S., A.B.R., K.W.D., M.C.B., K.S.L.); and Department of Radiology, William S. Middleton Veterans Hospital, Madison, Wis (M.C.B.)
| | - Kenneth S Lee
- From the Department of Radiology, University of Wisconsin Hospital and Clinics, 600 Highland Ave, Madison, WI 53792 (J.S.S., A.B.R., K.W.D., M.C.B., K.S.L.); and Department of Radiology, William S. Middleton Veterans Hospital, Madison, Wis (M.C.B.)
| |
Collapse
|
4
|
Mejia J, Iohom G, Cuñat T, Flò Csefkó M, Arias M, Fervienza A, Sala-Blanch X. Accuracy of ultrasonography predicting spread location following intraneural and subparaneural injections: a scoping review. Minerva Anestesiol 2022; 88:166-172. [PMID: 35072434 DOI: 10.23736/s0375-9393.21.16041-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
INTRODUCTION Ultrasonography is useful for detecting intraneural injections. However, the reliability of the sonographic findings of intraneural and subparaneural injections in terms of true spread location and their association with intrafascicular deposits has not been systematically evaluated. EVIDENCE ACQUISITION Our objectives were: i) to explore the reliability of sonographic findings of intraneural and subparaneural injections when validated with tests of true spread such as histology, dissection or imaging, and ii) to evaluate their association with intrafascicular deposits. A Scoping Review was conducted according to Joanna Briggs guidelines. Cinahl, PubMed, ProQuest, ScienceDirect, Scopus and Cochrane databases were searched for studies on adults, cadavers and animal models. Paediatric studies were excluded. EVIDENCE SYNTHESIS The search strategy found 598 citations. Following screening, 19 studies were selected. Intraneural injections occurred in the brachial plexus, sciatic, femoral and median nerves. Subparaneural injections in popliteal, supraclavicular and interscalene blocks. Sixteen different ultrasound findings were used to label injection location. Subepineural deposits within individual nerves occurred occasionally following subparaneural injections, regardless of nerve expansion. Overall five studies reported intrafascicular deposits, two of which frequently, following intraneural and subparaneural injections. None of the currently used ultrasound findings was predictive of intrafascicular deposits. CONCLUSIONS Our results suggest that sonographic parameters of intraneural and subparaneural injections are reliable in terms of detecting spread location. Intrafascicular injectate deposition may occur, albeit infrequently, particularly in the proximal brachial plexus. Our findings support the judicious interrogation of sonographic parameters suggestive of incipient intraneural injection.
Collapse
Affiliation(s)
- Jorge Mejia
- Department of Anesthesiology, Pain Management and Intensive Care Medicine, Hospital Clinic de Barcelona, Barcelona, Spain -
| | - Gabriella Iohom
- Department of Anaesthesia and Intensive Care Medicine, Cork University Hospital and University College Cork, Cork, Ireland
| | - Tomás Cuñat
- Department of Anesthesiology, Pain Management and Intensive Care Medicine, Hospital Clinic de Barcelona, Barcelona, Spain
| | - Marti Flò Csefkó
- Department of Anesthesiology, Pain Management and Intensive Care Medicine, Hospital Clinic de Barcelona, Barcelona, Spain
| | - Marilyn Arias
- Department of Anesthesiology, Pain Management and Intensive Care Medicine, Hospital Clinic de Barcelona, Barcelona, Spain
| | - Ana Fervienza
- Department of Anesthesiology, Pain Management and Intensive Care Medicine, Hospital Clinic de Barcelona, Barcelona, Spain
| | - Xavier Sala-Blanch
- Department of Anesthesiology, Pain Management and Intensive Care Medicine, Hospital Clinic de Barcelona, Barcelona, Spain
| |
Collapse
|
5
|
Artificial Intelligence: Innovation to Assist in the Identification of Sono-anatomy for Ultrasound-Guided Regional Anaesthesia. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1356:117-140. [PMID: 35146620 DOI: 10.1007/978-3-030-87779-8_6] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
Ultrasound-guided regional anaesthesia (UGRA) involves the targeted deposition of local anaesthesia to inhibit the function of peripheral nerves. Ultrasound allows the visualisation of nerves and the surrounding structures, to guide needle insertion to a perineural or fascial plane end point for injection. However, it is challenging to develop the necessary skills to acquire and interpret optimal ultrasound images. Sound anatomical knowledge is required and human image analysis is fallible, limited by heuristic behaviours and fatigue, while its subjectivity leads to varied interpretation even amongst experts. Therefore, to maximise the potential benefit of ultrasound guidance, innovation in sono-anatomical identification is required.Artificial intelligence (AI) is rapidly infiltrating many aspects of everyday life. Advances related to medicine have been slower, in part because of the regulatory approval process needing to thoroughly evaluate the risk-benefit ratio of new devices. One area of AI to show significant promise is computer vision (a branch of AI dealing with how computers interpret the visual world), which is particularly relevant to medical image interpretation. AI includes the subfields of machine learning and deep learning, techniques used to interpret or label images. Deep learning systems may hold potential to support ultrasound image interpretation in UGRA but must be trained and validated on data prior to clinical use.Review of the current UGRA literature compares the success and generalisability of deep learning and non-deep learning approaches to image segmentation and explains how computers are able to track structures such as nerves through image frames. We conclude this review with a case study from industry (ScanNav Anatomy Peripheral Nerve Block; Intelligent Ultrasound Limited). This includes a more detailed discussion of the AI approach involved in this system and reviews current evidence of the system performance.The authors discuss how this technology may be best used to assist anaesthetists and what effects this may have on the future of learning and practice of UGRA. Finally, we discuss possible avenues for AI within UGRA and the associated implications.
Collapse
|
6
|
Carles M, Beloeil H, Bloc S, Nouette-Gaulain K, Aveline C, Cabaton J, Cuvillon P, Dadure C, Delaunay L, Estebe JP, Hofliger E, Martinez V, Olivier M, Robin F, Rosencher N, Capdevila X. Anesthésie loco-régionale périnerveuse (ALR-PN). ANESTHÉSIE & RÉANIMATION 2019. [DOI: 10.1016/j.anrea.2019.02.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
7
|
Rambhia M, Gadsden J. Pressure monitoring: The evidence so far. Best Pract Res Clin Anaesthesiol 2019; 33:47-56. [DOI: 10.1016/j.bpa.2019.03.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 03/04/2019] [Accepted: 03/05/2019] [Indexed: 11/15/2022]
|
8
|
Silva Herrera RE, Serrá Sandoval A, Gonzalez Venegas M, de Lara González S, Gracia J, Sala-Blanch X. Cross-sectional area of the median nerve after intraneural vs perineural low volume administration. ACTA ACUST UNITED AC 2018; 66:122-128. [PMID: 30528459 DOI: 10.1016/j.redar.2018.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 09/11/2018] [Accepted: 09/13/2018] [Indexed: 10/27/2022]
Abstract
INTRODUCTION To recognise the relationship between the needle tip and the median nerve during peripheral nerve block is of interest to avoid neural damage. However, signs of intraneural injection are not clearly established. The aim of this study was to define the changes observed in the peripheral nerve after the intraneural or perineural administration of 1ml of solution. MATERIAL AND METHODS Ultrasound guided median nerve blocks were performed in the forearm of 10 fresh cadavers on 60 occasions (3 per forearm). They were randomised into the intraneural (n=30) or perineural (n=30) location of the needle tip, after the consensus of location by 7 specialists. After 1ml of solution was injected an evaluation was made of the changes in the cross-sectional area of the nerve, as well as the displacement along the nerve. RESULTS The cross-sectional area of the median nerve was increased in both groups, however, the increase was significantly higher in the intraneural group (perineural 0.007±0.013cm2 vs. intraneural 0.032±0.021cm2, P<.0001). An increase of more than 27% of the area ensures an intraneural injection in the median nerve according to the ROC curve analysis. Both proximal and distal diffusion were observed more frequently in the intraneural group (proximal: 86% vs 14%, P<.0001, Distal: 43% vs 4%, P<.0001). CONCLUSIONS Based on this experimental study, it is concluded that the injection of a small volume (1ml) allows to discriminate the disposition of the intraneural vs perineural needle in a high percentage of cases. Therefore, it is suggested that this "dose test" should be considered in the safety algorithms if it is required to reduce the incidence of intraneural injection.
Collapse
Affiliation(s)
| | - A Serrá Sandoval
- Facultad de Medicina, Universitat de Barcelona, Barcelona, España
| | | | | | - J Gracia
- Hospital Clinic, Universitat de Barcelona, Barcelona, España
| | - X Sala-Blanch
- Facultad de Medicina, Universitat de Barcelona, Barcelona, España; Hospital Clinic, Universitat de Barcelona, Barcelona, España.
| |
Collapse
|
9
|
Szerb J, Kwesi Kwofie M. Ultrasound-guided block and the incidence of intraneural injection. Anaesthesia 2017; 72:913-914. [PMID: 28608385 DOI: 10.1111/anae.13913] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- J Szerb
- Dalhousie University, Halifax, Canada
| | | |
Collapse
|
10
|
Kollmann-Camaiora A, Brogly N, Alsina E, Gilsanz F. Use of the cumulative sum method (CUSUM) to assess the learning curves of ultrasound-guided continuous femoral nerve block. ACTA ACUST UNITED AC 2017; 64:453-459. [PMID: 28342526 DOI: 10.1016/j.redar.2017.02.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 02/21/2017] [Accepted: 02/22/2017] [Indexed: 11/30/2022]
Abstract
BACKGROUND Although ultrasound is a basic competence for anaesthesia residents (AR) there is few data available on the learning process. This prospective observational study aims to assess the learning process of ultrasound-guided continuous femoral nerve block and to determine the number of procedures that a resident would need to perform in order to reach proficiency using the cumulative sum (CUSUM) method. METHODS We recruited 19 AR without previous experience. Learning curves were constructed using the CUSUM method for ultrasound-guided continuous femoral nerve block considering 2 success criteria: a decrease of pain score>2 in a [0-10] scale after 15minutes, and time required to perform it. RESULTS We analyse data from 17 AR for a total of 237 ultrasound-guided continuous femoral nerve blocks. 8/17 AR became proficient for pain relief, however all the AR who did more than 12 blocks (8/8) became proficient. As for time of performance 5/17 of AR achieved the objective of 12minutes, however all the AR who did more than 20 blocks (4/4) achieved it. CONCLUSIONS The number of procedures needed to achieve proficiency seems to be 12, however it takes more procedures to reduce performance time. The CUSUM methodology could be useful in training programs to allow early interventions in case of repeated failures, and develop competence-based curriculum.
Collapse
Affiliation(s)
- A Kollmann-Camaiora
- Departamento de Anestesiología y Reanimación, Hospital Universitario La Paz, Madrid, España.
| | - N Brogly
- Departamento de Anestesiología y Reanimación, Hospital Universitario La Paz, Madrid, España
| | - E Alsina
- Departamento de Anestesiología y Reanimación, Hospital Universitario La Paz, Madrid, España
| | - F Gilsanz
- Departamento de Anestesiología y Reanimación, Hospital Universitario La Paz, Madrid, España
| |
Collapse
|
11
|
Carles M, Beloeil H, Bloc S, Nouette-Gaulain K, Aveline C, Cabaton J, Cuvillon P, Dadure C, Delaunay L, Estebe JP, Hofliger E, Martinez V, Olivier M, Robin F, Rosencher N, Capdevila X. Anesthésie locorégionale périnerveuse. ANESTHESIE & REANIMATION 2017. [DOI: 10.1016/j.anrea.2017.01.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
12
|
Sermeus LA, Sala-Blanch X, McDonnell JG, Lobo CA, Nicholls BJ, van Geffen GJ, Choquet O, Iohom G, de Jose Maria Galve B, Hermans C, Lammens M. Ultrasound-guided approach to nerves (direct vs. tangential) and the incidence of intraneural injection: a cadaveric study. Anaesthesia 2017; 72:461-469. [DOI: 10.1111/anae.13787] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/24/2016] [Indexed: 12/11/2022]
Affiliation(s)
| | - X. Sala-Blanch
- University of Barcelona; Barcelona Spain
- Hospital Clinic; Barcelona Spain
| | - J. G. McDonnell
- National University of Ireland and Clinical Research Facility; Galway University Hospitals; Galway Ireland
| | - C. A. Lobo
- Anaesthesiology Service of Hospital das Forças Armada/Polo Porto; Porto Portugal
| | | | - G. J. van Geffen
- Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands
| | - O. Choquet
- Lapeyronie University Hospital; Montpellier France
| | - G. Iohom
- University Hospital and University College Cork; Cork Ireland
| | | | - C. Hermans
- Centre for Oncological Research Antwerp; University of Antwerp; Antwerp Belgium
| | - M. Lammens
- Department of Pathology; Antwerp University Hospital; Antwerp Belgium
| |
Collapse
|
13
|
Sondekoppam RV, Tsui BCH. Factors Associated With Risk of Neurologic Complications After Peripheral Nerve Blocks. Anesth Analg 2017; 124:645-660. [DOI: 10.1213/ane.0000000000001804] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
14
|
Opening Injection Pressure Is Higher in Intraneural Compared With Perineural Injections During Simulated Nerve Blocks of the Lower Limb in Fresh Human Cadavers. Reg Anesth Pain Med 2017; 42:362-367. [DOI: 10.1097/aap.0000000000000548] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
15
|
The Requisites of Needle-to-Nerve Proximity for Ultrasound-Guided Regional Anesthesia. Reg Anesth Pain Med 2016; 41:221-8. [DOI: 10.1097/aap.0000000000000201] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
16
|
|
17
|
The Second American Society of Regional Anesthesia and Pain Medicine Evidence-Based Medicine Assessment of Ultrasound-Guided Regional Anesthesia. Reg Anesth Pain Med 2016; 41:181-94. [DOI: 10.1097/aap.0000000000000331] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
|
18
|
Histological confirmation of needle tip position during ultrasound-guided interscalene block: a randomized comparison between the intraplexus and the periplexus approach. Can J Anaesth 2015; 62:1295-302. [PMID: 26335906 DOI: 10.1007/s12630-015-0468-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Revised: 07/20/2015] [Accepted: 08/20/2015] [Indexed: 10/23/2022] Open
Abstract
PURPOSE Ultrasound-guided interscalene block can be performed using either periplexus or intraplexus needle placement. In this novel study, we histologically examined the needle tip position in relation to the neural tissues with the two techniques. Our objective was to investigate the variable risk of subepineurial needle tip placement resulting from the two ultrasound-guided techniques. METHODS In an embalmed cadaveric model, periplexus or intraplexus interscalene injections were performed with the side, order, and technique assigned randomly. Under real-time ultrasound guidance, the block needle was placed next to the hyperechoic layer of the plexus (periplexus) or between the hypoechoic nerve roots (intraplexus). Once positioned, 0.1 mL of black acrylic ink was injected. The brachial plexus tissues were then removed and histology sections were prepared and then coded in order to blind two reviewers to group allocation. The area of ink staining was used to determine needle tip location, and the groups were compared for the presence of subepineurial ink. RESULTS Twenty-six cadavers had each of the blocks performed on either brachial plexus (i.e., 52 injections). No subepineurial ink deposits were observed in the periplexus group (0%), but subepineurial ink deposition was observed in 3/26 (11.5%) intraplexus injections (odds ratio, 0; 95% confidence interval, 0 to 2.362; P = 0.235). Furthermore, in the intraplexus group, two (of the three) subepineurial ink deposits were observed under the perineurium. CONCLUSION Although our study was somewhat underpowered due to a lower than previously reported rate of subepineurial needle tip positioning, our results suggest that there may be an increased likelihood of subepineurial needle tip position with the intraplexus approach. The periplexus technique resulted in no subepineurial spread of ink, suggesting that this approach may be less likely to result in mechanical trauma to nerves from direct needle injury.
Collapse
|
19
|
Postoperative pain and the use of ultrasound-guided regional analgesia in pediatric supracondylar humerus fractures. J Pediatr Orthop B 2015; 24:178-83. [PMID: 25569536 DOI: 10.1097/bpb.0000000000000139] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
A total of 230 children undergoing closed reduction and percutaneous pinning of supracondylar humerus fractures were analyzed retrospectively. Severe pain (score ≥ 7/10) was reported in 10% of general anesthesia-only patients in the postanesthesia care unit and in 28% of the 130 admitted patients. The 36 patients who received ultrasound-guided regional analgesia+general anesthesia had decreased intraoperative opioid consumption and postanesthesia care unit pain scores. After admission, pain scores and opioid consumption did not differ between fracture and anesthesia types. No patient developed compartment syndrome. Severe pain is frequent after closed reduction and percutaneous pinning of supracondylar humerus fractures. Further study of ultrasound-guided regional analgesia is needed.
Collapse
|
20
|
|
21
|
Intraneural or extraneural: diagnostic accuracy of ultrasound assessment for localizing low-volume injection. Reg Anesth Pain Med 2014; 39:409-13. [PMID: 25068413 DOI: 10.1097/aap.0000000000000124] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND AND OBJECTIVES When one is performing ultrasound-guided peripheral nerve blocks, it is common to inject a small amount of fluid to confirm correct placement of the needle tip. If an intraneural needle tip position is detected, the needle can then be repositioned to prevent injection of a large amount of local anesthetic into the nerve. However, it is unknown if anesthesiologists can accurately discriminate intraneural and extraneural injection of small volumes. Therefore, this study was conducted to determine the diagnostic accuracy of ultrasound assessment using a criterion standard and to compare experts and novices in ultrasound-guided regional anesthesia. METHODS A total of 32 ultrasound-guided infragluteal sciatic nerve blocks were performed on 21 cadaver legs. The injections were targeted to be intraneural (n = 18) or extraneural (n = 14), and 0.5 mL of methylene blue 1% was injected. Cryosections of the nerve and surrounding tissue were assessed by a blinded investigator as "extraneural" or "intraneural." Ultrasound video clips of the injections were reviewed by 10 blinded observers (5 experts, 5 novices) independently who scored each injection as either "intraneural," "extraneural," or "undetermined." RESULTS The mean sensitivity of experts and novices was measured to be 0.84 (0.80-0.88) and 0.65 (0.60-0.71), respectively (P = 0.006), whereas mean specificity was 0.97 (0.94-0.98) and 0.98 (0.96-0.99) (P = 0.53). CONCLUSIONS Discrimination of intraneural or extraneural needle tip position based on an injection of 0.5mL is possible, but even experts missed 1 of 6 intraneural injections. In novices, the sensitivity of assessment was significantly lower, highlighting the need for focused education.
Collapse
|
22
|
|
23
|
|
24
|
|
25
|
Standard approaches for upper extremity nerve blocks with an emphasis on outpatient surgery. Curr Opin Anaesthesiol 2013; 26:501-8. [PMID: 23787491 DOI: 10.1097/aco.0b013e328362d08a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
PURPOSE OF REVIEW Currently, no standards exist with regard to the techniques and administration of ultrasound-guided peripheral nerve blocks. Consequently, the techniques and teaching substantially vary among practitioners and institutions. The purpose of this review is to propose a set of standard US-guided techniques for upper extremity nerve blocks. RECENT FINDINGS On the basis of the synthesis of information in available literature and the consensus of an internationally recognized collaborative panel of regional anaesthesia experts, the review recommends a standardized approach to common upper extremity nerve blocks using ultrasound guidance. SUMMARY A set of structured recommendations and approaches are suggested to help standardize clinical practice and teaching of ultrasound-guided upper extremity nerve blocks. Additional emphasis is placed on the discussion of nerve blocks in outpatient surgery.
Collapse
|
26
|
Distale Blockaden des N. ischiadicus. Anaesthesist 2013; 62:183-88, 190-2. [DOI: 10.1007/s00101-013-2150-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 01/18/2013] [Accepted: 01/29/2013] [Indexed: 11/25/2022]
|
27
|
|