Ultrasound guidance as a gold standard in regional anaesthesia

Artificial intelligence in regional anaesthesia

Ultrasound-guided regional anaesthesia is used to facilitate the real-time performance of the regional block, increase the block success and reduce the complication rate. Artificial intelligence (AI) has been studied in many medical disciplines with high success rates, especially radiology. The purpose of this article was to review the evolution of AI in regional anaesthesia. The role of AI is to identify and optimise the sonography image, display the target, guide the practitioner to advance the needle tip to the intended target and inject the local anaesthetic. AI supports non-experts in training and clinical practice and experts in teaching ultrasound-guided regional anaesthesia.

Local anesthetics systemic toxicity in children: analysis of the French pharmacovigilance database

PURPOSE

To characterize clinical profile of pediatric local anesthetic (LA) systemic toxicity (LAST) and to identify determinants of life-threatening outcomes.

METHODS

Spontaneous reports notified to the French Pharmacovigilance Network were retrieved and followed by a case-by-case review, according to the following criteria: LA as suspected drug, age < 18 years, adverse drug reactions related to nervous system, cardiac, respiratory, psychiatric or general disorders. Multivariate logistic regression analysis was performed to identify factors leading to life-threatening reaction (i.e. continuous seizures or cardiorespiratory arrest).

RESULTS

Among 512 cases retrieved, 64 LAST cases were included (neonates 11%, infants 30%, children 36%, adolescents 23%) mainly involving lidocaine (47%), lidocaine + prilocaine (22%) and ropivacaine (14%). Toxicity profiles were neurological (58%), cardiac (11%) or mixed (20%) and 7 patients (11%) developed methemoglobinemia. LAST was life-threatening for 23 patients (36%) and 2 patients died. Doses were above recommendations in 26 patients (41%) and were not different between life-threatening and non-life-threatening cases. The context of use (general and orthopedic surgery, p = 0.006) and the type of LA agent (lidocaine, p = 0.016) were independently associated with a life-threatening outcome.

CONCLUSION

In this national retrospective analysis, LAST in children appear to be a rare event. Neurological and cardiac signs were the most frequently reported reactions. LAST in children can be life-threatening, even at therapeutic doses. Although a fatal outcome may anecdotally occur, the vast majority of patients recovered after appropriate medical care.

Motor-Sparing Effect of Adductor Canal Block for Knee Analgesia: An Updated Review and a Subgroup Analysis of Randomized Controlled Trials Based on a Corrected Classification System

OBJECTIVE

Discrepancies in the definition of adductor canal block (ACB) lead to inconsistent results. To investigate the actual analgesic and motor-sparing effects of ACB by anatomically defining femoral triangle block (FTB), proximal ACB (p-ACB), and distal ACB (d-ACB), we re-classified the previously claimed ACB approaches according to the ultrasound findings or descriptions in the corresponding published articles. A meta-analysis with subsequent subgroup analyses based on these corrected results was performed to examine the true impact of ACB on its analgesic effect and motor function (quadriceps muscle strength or mobilization ability). An optimal ACB technique was also suggested based on an updated review of evidence and ultrasound anatomy.

MATERIALS AND METHODS

We systematically searched studies describing the use of ACB for knee surgery. Cochrane Library, PubMed, Web of Science, and Embase were searched with the exclusion of non-English articles from inception to 28 February 2022. The motor-sparing and analgesic aspects in true ACB were evaluated using meta-analyses with subsequent subgroup analyses according to the corrected classification system.

RESULTS

The meta-analysis includes 19 randomized controlled trials. Compared with the femoral nerve block group, the quadriceps muscle strength (standardized mean difference (SMD) = 0.33, 95%-CI [0.01; 0.65]) and mobilization ability (SMD = -22.44, 95%-CI [-35.37; -9.51]) are more preserved in the mixed ACB group at 24 h after knee surgery. Compared with the true ACB group, the FTB group (SMD = 5.59, 95%-CI [3.44; 8.46]) has a significantly decreased mobilization ability at 24 h after knee surgery.

CONCLUSION

By using the corrected classification system, we proved the motor-sparing effect of true ACB compared to FTB. According to the updated ultrasound anatomy, we suggested proximal ACB to be the analgesic technique of choice for knee surgery. Although a single-shot ACB is limited in duration, it remains the candidate of the analgesic standard for knee surgery on postoperative day 1 or 2 because it induces analgesia with less motor involvement in the era of multimodal analgesia. Furthermore, data from the corrected classification system may provide the basis for future research.

Utility of the transversus abdominis plane and rectus sheath blocks in patients undergoing anterior lumbar interbody fusions

BACKGROUND CONTEXT

Anterior lumbar interbody fusion (ALIF) is a well-established technique to address numerous pathological conditions of the spine and to restore sagittal spine balance. Improving patient comfort and reducing opioid consumption following lumbar fusions is a significant goal for spine surgeons. Therefore, there is a growing need to explore multimodal options for pain management post-surgery.

PURPOSE

Determine the effectiveness of combined transversus abdominis plane (TAP) and rectus sheath (RS) blocks in those undergoing (ALIF) as compared to a historical control.

STUDY DESIGN/SETTING

Retrospective comparative cohort performed at a tertiary referral orthopedic specialty hospital.

PATIENT SAMPLE

Of the 175 patients (88 patients received a combined regional block) who underwent an ALIF between January 1, 2018 and August 1, 2021.

OUTCOME MEASURES

Pain scores both during activity and at rest, opioid consumption during the first 72 hours postoperatively, total postoperative anesthesia care unit length of stay (PACU LOS), 30-day emergency department visits, 30-day readmissions, and unplanned returns to the operating room.

METHODS

Charts of patients undergoing an ALIF during the open period for this study were placed into two groups: those that received combined regional anesthesia and those that did not. A t test assuming unequal variances was used to determine if there were differences in outcome variables between the two groups.

RESULTS

The study group, those receiving the combine block, demonstrated a statistically significant reduction in opioid pain medicine (24.8%), reported pain (10-13%), and PACU LOS (18.7%). There were no differences in complication rates between the two groups.

CONCLUSIONS

The combined use of TAP and RS blocks appears to be a well-tolerated and effective means of pain management in this patient cohort.

Ultrasound-guided fascial plane blocks for spine surgery

PURPOSE OF REVIEW

The development of truncal and fascial plane blocks has created novel opportunities to apply regional analgesic techniques to patients undergoing spine surgery. This review will summarize recent literature devoted to evaluating candidate blocks for spine surgery, including erector spinae plane block, thoracolumbar interfascial plane block, midpoint transverse process to pleura block, and transversus abdominis plane block. Procedure-specific effects of blocks on patient and healthcare system outcomes will be presented and gaps in care and knowledge will be highlighted.

RECENT FINDINGS

The most studied paradigm was bilateral erector spinae plane block for lumbar spine surgery. The most common outcomes assessed were early postoperative pain scores, opioid consumption and related side effects, and length of hospital stay. All candidate blocks were associated with mixed evidence for analgesic and opioid-sparing benefits, and/or reductions in length of hospital stay. The magnitude of these effects was overall small, with many studies showing statistically but not clinically significant differences on outcomes of interest. This may reflect, at least in part, the current state of the (emerging) evidence base on this topic.

SUMMARY

Our understanding of the risks, benefits, and value of truncal and fascial plane blocks for spine surgery cohorts is evolving. Although the results derived from this body of literature are encouraging, further research is required before the widespread adoption of specified blocks into spine care can be recommended.

Ultrasound-guided peripheral nerve blocks for preoperative pain management in hip fractures: a systematic review

Systematic reviews associate peripheral nerve blocks based on anatomic landmarks or nerve stimulation with reduced pain and need for systemic analgesia in hip fracture patients. We aimed to investigate the effect of ultrasound-guided nerve blocks compared to conventional analgesia for preoperative pain management in hip fractures. Five databases were searched until June 2021 to identify randomised controlled trials. Two independent authors extracted data and assessed risk of bias. Data was pooled for meta-analysis and quality of evidence was evaluated using Grades of Recommendation Assessment, Development and Evaluation (GRADE). We included 12 trials (976 participants) comparing ultrasound-guided nerve blocks to conventional systemic analgesia. In favour of ultrasound, pain measured closest to two hours after block placement decreased with a mean difference of -2.26 (VAS 0 to 10); (p < 0.001) 95% CI [–2.97 to –1.55]. In favour of ultrasound, preoperative analgesic usage of iv. morphine equivalents in milligram decreased with a mean difference of –5.34 (p=0.003) 95% CI [–8.11 to –2.58]. Time from admission until surgery ranged from six hours to more than three days. Further, ultrasound-guided nerve blocks may be associated with a lower frequency of delirium: risk ratio 0.6 (p = 0.03) 95% CI [0.38 to 0.94], fewer serious adverse events: risk ratio 0.33 (p = 0.006) 95% CI [0.15 to 0.73] and higher patient satisfaction: mean difference 25.9 (VAS 0 to 100) (p < 0.001) 95% CI [19.74 to 32.07]. However, the quality of evidence was judged low or very low. In conclusion, despite low quality of evidence, ultrasound-guided blocks were associated with benefits compared to conventional systemic analgesia.

Ultrasound-Guided Femoral Nerve Block in Geriatric Patients with Hip Fracture in the Emergency Department

Background and Objectives: Systemic analgesics, including opioids, are commonly used for acute pain control in traumatic hip fracture patients in the emergency department (ED). However, their use is associated with high rates of adverse reactions in the geriatric population. As such, the aim of this study was to investigate the impact of lidocaine-based single-shot ultrasound-guided femoral nerve block (USFNB) on the standard care for acute pain management in geriatric patients with traumatic hip fracture in the ED. Methods: This retrospective, single-center, observational study included adult patients aged ≥60 years presenting with acute traumatic hip fracture in the ED between 1 January 2017 and 31 December 2020. The primary outcome measure was the difference in the amount of opioid use, in terms of morphine milligram equivalents (MME), between lidocaine-based single-shot USFNB and standard care groups. The obtained data were evaluated through a time-to-event analysis (time to meaningful pain relief), a time course analysis, and a multivariable analysis. Results: Overall, 607 adult patients (USFNB group, 66; standard care group, 541) were included in the study. The patients in the USFNB group required 80% less MME than those in the standard care group (0.52 ± 1.47 vs. 2.57 ± 2.53, p < 0.001). The multivariable Cox proportional hazards regression models showed that patients who received USFNB achieved meaningful pain relief 2.37-fold faster (hazard ratio (HR) = 2.37, 95% confidence intervals (CI) = 1.73−3.24, p < 0.001). Conclusions: In geriatric patients with hip fractures, a lidocaine-based single-shot USFNB can significantly reduce opioid consumption and provide more rapid and effective pain reduction.

Relationship Between Gender, Age, BMI and Side of Body on the Size and Position of Nerves of the Brachial Plexus in Axilla: Pilot Study

Background and Objectives

Studies demonstrate variations in the size and position of the nerves in the brachial plexus. The objective of this pilot study was to determine the effect of age, gender, BMI and side of body on the size and position of these nerves and to determine the feasibility of a further study.

Methods

Twenty healthy volunteers were recruited. The ultrasound position of the nerves was confirmed by a dynamic scan. The size of the nerves was calculated using the freehand calliper tool. A graph was designed to study the position of the nerves. ImageJ was used to analyse the position of the nerves. Student's t-tests were carried out to compare the gender and side of arm with the size of the nerve. Pearson's correlation coefficients were calculated to determine the correlation between BMI and age with the size of the nerves. The position of the nerves was compared between male and female, and left and right sides of the body.

Results

The mean size of the median nerve, musculocutaneous nerve, radial nerve and ulnar nerve was 0.099, 0.032, 0.179 and 0.076 cm2 (males) and 0.091, 0.022, 0.128 and 0.026 cm2 (females), respectively. There were significant differences between the size of nerves and gender in the musculocutaneous, radial and ulnar nerves (P <0.05). The correlations between the sizes of the nerves with BMI and age were not significant. The position of the radial nerves was found to be variable within the same genders and between males and females. The position of the nerves was variable between the left and right hand side.

Conclusion

The position and size of brachial plexus branches in axilla is very variable. This pilot study highlights the need for further research with larger sample sizes to fully understand the extent and implication of this variability.

A Survey of Regional Anesthesia Use in Greece and the Impact of a Structured Regional Anesthesia Course on Regional Techniques Knowledge and Practice

Background: Due to the growing interest in regional anesthesia (RA) techniques and the realization of the need for formalized education in them, the Greek Chapter of the European Society of Regional Anesthesia and Pain Therapy (ESRA-Hellas) has established a structured hands-on training course held annually since 2009, which is quite popular in the community of Greek anesthesiologists. The aim of the current survey was twofold: first, to provide an overview of the current practice of RA in Greece; secondly, to evaluate the effect the aforementioned training course has on participants’ knowledge and attitude towards RA. Methods: An electronic questionnaire was uploaded on SurveyMonkey and a link giving access to the questionnaire was forwarded via email to a mailing list of 825 practicing Greek anesthesiologists held in the electronic database of ESRA Hellas. The survey was totally anonymous and no identifying information was collected throughout. It contained questions relating to the anesthesiologists’ demographic characteristics, their RA practice, and information pertaining to the RA training course. Results: A total of 424 fully completed questionnaires were received, representing an overall response rate of 51.4%. Attendants of the course are more familiar than non-attendants with the performance of peripheral nerve blocks with neurostimulation and/or ultrasound guidance (p < 0.001). Attendants are also less likely to practice exclusively general anesthesia, more likely to use peripheral blocks for lower limb surgery, and more likely to consider taking the European Diploma of RA in comparison to non-attendants (p < 0.001, p = 0.018 and p = 0.002, respectively). Both cohorts consider the course of value and agree that the main reason to use regional techniques is to ensure optimal postoperative analgesia, while the main hindrance to RA practice is the lack of relevant education in the techniques, especially those under ultrasound guidance. Regarding improvement of the course, most participants suggested devoting ampler time in hands-on ultrasound practice and application. Conclusions: Greek anesthesiologists seek educational activities in the field of RA and the course seems to fulfil the majority of attendants’ expectations. There will be further effort by the organizers to improve weaknesses of the current course and undertake further educational initiatives in the field of RA according to international recommendations.

e-Learning in regional anesthesia

PURPOSE OF REVIEW

To explore the role and impact of e-learning technologies on regional anesthesia.

RECENT FINDINGS

21st century technologies, such as 'smart' medical appliances, personal computers, sophisticated apps, the ubiquitous Internet, and online 'e-learning' curricula, are having a powerful impact on anesthesia training: when we learn, what we learn, and how we learn. But is 'new' necessarily 'better'? The answer will result from the application of developments in IT technology through the current vision of architects of future anesthesia training programs. This narrative review aims to summarize the recent developments in anesthesia e-learning, and to forecast trends using regional anesthesia as an example.

SUMMARY

The review offers some recommendations to ensure that the blessings promised to human learning by this 'Brave New Cyberworld' do not become its nemesis.

European Society of Anaesthesiology and Intensive Care Guidelines on peri-operative use of ultrasound for regional anaesthesia (PERSEUS regional anesthesia): Peripheral nerves blocks and neuraxial anaesthesia

Nowadays, ultrasound-guidance is commonly used in regional anaesthesia (USGRA) and to locate the spinal anatomy in neuraxial analgesia. The aim of this second guideline on the PERi-operative uSE of UltraSound (PERSEUS-RA) is to provide evidence as to which areas of regional anaesthesia the use of ultrasound guidance should be considered a gold standard or beneficial to the patient. The PERSEUS Taskforce members were asked to define relevant outcomes and rank the relative importance of outcomes following the GRADE process. Whenever the literature was not able to provide enough evidence, we decided to use the RAND method with a modified Delphi process. Whenever compared with alternative techniques, the use of USGRA is considered well tolerated and effective for some nerve blocks but there are certain areas, such as truncal blocks, where a lack of robust data precludes useful comparison. The new frontiers for further research are represented by the application of USG during epidural analgesia or spinal anaesthesia as, in these cases, the evidence for the value of the use of ultrasound is limited to the preprocedure identification of the anatomy, providing the operator with a better idea of the depth and angle of the epidural or spinal space. USGRA can be considered an essential part of the curriculum of the anaesthesiologist with a defined training and certification path. Our recommendations will require considerable changes to some training programmes, and it will be necessary for these to be phased in before compliance becomes mandatory.

The use of artificial intelligence and robotics in regional anaesthesia

The current fourth industrial revolution is a distinct technological era characterised by the blurring of physics, computing and biology. The driver of change is data, powered by artificial intelligence. The UK National Health Service Topol Report embraced this digital revolution and emphasised the importance of artificial intelligence to the health service. Application of artificial intelligence within regional anaesthesia, however, remains limited. An example of the use of a convoluted neural network applied to visual detection of nerves on ultrasound images is described. New technologies that may impact on regional anaesthesia include robotics and artificial sensing. Robotics in anaesthesia falls into three categories. The first, used commonly, is pharmaceutical, typified by target-controlled anaesthesia using electroencephalography within a feedback loop. Other types include mechanical robots that provide precision and dexterity better than humans, and cognitive robots that act as decision support systems. It is likely that the latter technology will expand considerably over the next decades and provide an autopilot for anaesthesia. Technical robotics will focus on the development of accurate sensors for training that incorporate visual and motion metrics. These will be incorporated into augmented reality and visual reality environments that will provide training at home or the office on life-like simulators. Real-time feedback will be offered that stimulates and rewards performance. In discussing the scope, applications, limitations and barriers to adoption of these technologies, we aimed to stimulate discussion towards a framework for the optimal application of current and emerging technologies in regional anaesthesia.

Fiber-Needle Swept-Source Optical Coherence Tomography for the Real-Time Visualization of the Transversus Abdominis Plane Block Procedure in a Swine Model

BACKGROUND

Fascia blocks (eg, the transversus abdominis plane [TAP] block) target the intermuscular fascia layers. Ultrasound techniques have allowed peripheral blocks to be performed with accuracy and safety, however, with limitations. Optical coherence tomography (OCT) is based on low-coherence interferometry. In this study, we examined the ability of OCT to identify the TAP.

METHODS

A swept-source OCT probe was placed in a 17-gauge needle to obtain imaging. The needle was inserted within 2 different angle ranges (0°-30° and 30°-60°) on a slice of pork belly to assess imaging characteristics. A series of real-time OCT imaging of the muscle, fascia, and interfascial space was obtained. The tissue location of the needle tip was identified using near-infrared (NIR) imaging. In vivo OCT imaging was further done on 3 female 6-month-old native Chinese Landrance Duroc pigs. Real-time images of tissue layers were obtained with needle insertion. Ultrasound imaging of the OCT needle probe was also performed at the same time for needle trajectory guidance. After imaging, the OCT probe was removed, and 5 mL of normal saline was injected via the needle to confirm correct fascia plane identification.

RESULTS

In and ex vivo studies showed clear visual distinction of muscle, fascia, and interfascial layer with OCT, with limitations. Independent validation of OCT criteria for the muscle/fascia differentiation by 20 OCT readers for the in vivo data demonstrated the sensitivity = 0.91, specificity = 0.90, and accuracy = 0.89. Although the angle of needle entry affected the depth of OCT penetration in the muscle, the attenuation coefficient values of the fascia and muscle tissue were statistically different (P < .001) and with high area under the receiver operating characteristics (ROC) curve (AUC) (AUC = 0.93 in 0°-30° and AUC = 1 in 30°-60°) for fascia identification.

CONCLUSIONS

This study introduced a novel needle imaging probe method to identify the transversus abdominis fascia plane in real-time. Quantitative calculation of the attenuation coefficients can further aid objective identification by providing direct confirmation of the tip position, increasing the first-pass success rate, and decreasing the need for needle repositioning. Combining OCT and ultrasound may improve the accuracy of anesthetics placement.

Developing Neuraxial and Regional Pain Procedural Skills Through Innovative 3-Dimensional Printing Technology

Context

Various forms of simulation-based training, including training models, increase training opportunities and help assess performance of a task. However, commercial training models for lumbar puncture and epidural procedures are costly.

Objective

To assess medical students’ and residents’ perception of 3-dimensional (3D)-printed lumbar, cervical, and pelvic models for mastering joint injection techniques and to determine the utility of ultrasonography-guided needle procedure training.

Methods

Osteopathic medical students and residents used in-house 3D-printed gel joint models during an injection ultrasonography laboratory for mastering lumbar epidural, caudal epidural, sacroiliac, and facet joint injection techniques. After the laboratory, they answered a 17-item survey about their perception of the importance of the models in medical education and future practice. The survey also evaluated comfort levels with performing joint injections after using the models, overall satisfaction with the models, and likelihood of using models in the future.

Results

Thirty-six medical students and residents participated. Both students and residents agreed that 3D-printed models were easy to use, aided understanding of corresponding procedures, and increased comfort with performing joint injections (all P<.001). Most participants (35 [97.2%]) believed that the models were reasonable alternatives to commercial models. Over half felt capable of successfully performing cervical or pelvic (22 [61.1%]) and lumbar epidural (23 [63.9%]) injections. The majority of participants (34 [94.4%]) would like to use the models in the future for personal training purposes. Overall, 100% believed that the 3D-printed models were a useful tool for injection training.

Conclusions

Results suggest that 3D-printed models provided realistic training experience for injection procedures and seemed to allow participants to quickly master new injection techniques. These models offer a visual representation of human anatomy and could be a cost-saving alternative to commercial trainers.

The combination of transversus abdominis plane block and rectus sheath block reduced postoperative pain after splenectomy: a randomized trial

Background

Splenectomy performed with a curved incision results in severe postoperative pain. The aim of this study was to evaluate the effect of transversus abdominis plane block and rectus sheath block on postoperative pain relief and recovery.

Methods

A total of 150 patients were randomized into the control (C), levobupivacaine (L) and levobupivacaine/morphine (LM) groups. The patients in the C group received only patient-controlled analgesia. The patients in the L and LM groups received transversus abdominis plane block and rectus sheath block with levobupivacaine or levobupivacaine plus morphine. The intraoperative opioid consumption; postoperative pain score; time to first analgesic use; postoperative recovery data, including the times of first exhaust, defecation, oral intake and off-bed activity; the incidence of postoperative nausea and vomiting and antiemetics use; and the satisfaction score were recorded.

Results

Transversus abdominis plane block and rectus sheath block reduced intraoperative opioid consumption. The patients in the LM group showed lower postoperative pain scores, opioid consumption, postoperative nausea and vomiting incidence and antiemetic use and presented shorter recovery times and higher satisfaction scores.

Conclusions

The combination of transversus abdominis plane block and rectus sheath block with levobupivacaine and morphine can improve postoperative pain relief, reduce the consumption of analgesics, and partly accelerate postoperative recovery.

Trial registration

Chinese Clinical Trial Registry, ChiCTR 1,800,015,141, 10 March 2018.

Pre-operative femoral nerve block for hip fracture-A systematic review with meta-analysis

BACKGROUND

Pre-operative pain management of hip fracture patients is complex. Femoral nerve block (FNB) is used for hip fractures to reduce pain and demand for systematic analgesia. The objective of the study was to systematically investigate the efficacy of single-shot FNB for hip fracture patients.

METHODS

Five databases were searched from inception until 8 May 2019. We included randomized controlled trials (RCT's) assessing pain relief in patients with hip fractures. Intervention was pre-operative FNB compared to any systemic analgesic (eg opioids, non-steroidal anti-inflammatory drugs or paracetamol). Primary outcomes assessed were pre-operative pain and use of rescue analgesics. Secondary outcome was cognitive impairment. We present a bias assessment, a meta-analysis and a grading of certainty of evidence.

RESULTS

We included five trials (n = 254), where participants received FNB 30 minutes or more prior to surgery; all were judged as having high risk of bias. All studies found significantly decreased pain scores at least once in the intervention group compared to the control group. Meta-analysis on the primary outcome of pain showed significance. Mean difference was -2.13 point (in cm) (CI:-3.53,-0.72) on visual analogue scale in the intervention group, but is judged low on certainty.

CONCLUSIONS

The quantity of evidence supporting pre-operative single-shot FNB for hip fractures is very low, and the certainty of evidence supporting pre-operative single-shot FNB for hip fractures is low. No studies using ultrasound guided technique were identified. Data on non-ultrasound guided FNB's suggest a decreased pain score compared to the use of systemic analgesia.

Anesthetic techniques: focus on transversus abdominis plane (TAP) blocks

Transverse abdominis plane (TAP) blocks, over the past decade, have emerged as a reliable tool in multimodal analgesia. Although they block only the somatic component of pain, studies have still revealed a consistent benefit in the first 24-48 hours after surgery in terms of pain scores and overall opioid consumption. The safety and dependability has increased with ultrasound usage. The aim of this review is to help the reader appreciate the applied anatomy required for a TAP block and its congeners, to standardize its nomenclature, and to help choose between variants of a TAP block and its complications and safety profile.

Ultrasound-Guided Versus Landmark-Based Approach to the Distal Suprascapular Nerve Block: A Comparative Cadaveric Study

PURPOSE

To compare the accuracy of distal suprascapular nerve (dSSN) blockade performed with the use of ultrasound-guided regional anesthesia (USRA) versus with a landmark-based approach (LBA). A secondary aim was to describe the anatomic features of the sensory branches of the dSSN.

METHODS

USRA and LBA were performed in 15 shoulders each from 15 cadavers (total of 30 shoulders). Then, 10 mL of methylene blue‒infused ropivacaine 0.75% was injected into the dSSN. Simultaneously, 2.5 mL of red latex solution was injected to identify the position of the needle tip. The division and distribution of the sensory branches originating from the SSN were described.

RESULTS

The tip of the needle was identified at 1.3 cm (range, 0-5.2 cm) and 1.5 cm (range, 0-4.5 cm) with USRA and the LBA, respectively (P = .90). Staining diffused past the origin of the most proximal sensory branch in 27 cases. The most proximal sensory branch arose 2.5 cm from the suprascapular notch. Among the 3 failures that occurred in the USRA group, the sensory branches also failed to be marked. All 30 dSSNs gave off 3 sensory branches, which innervated the posterior glenohumeral capsule, the subacromial bursa, and the coracoclavicular and acromioclavicular ligaments.

CONCLUSIONS

An LBA is as reliable and accurate as US guidance for anesthetic blockade of the dSSN. Marking of the suprascapular nerve must be proximal to the suprascapular notch to involve the 3 sensory branches in the anesthetic blockade.

CLINICAL RELEVANCE

The present study demonstrates that a landmark-based approach to anesthetic blockade of the distal suprascapular nerve is accurate and can be performed by orthopaedic surgeons lacking experience in ultrasound-guided anesthetic techniques.

Regional anesthetics: traditions and innovations

The wide implementation of different regional anesthesia techniques is also actual in pediatric anesthesiology. Using modern methods of regional anesthesia (RA) and modern local anesthetics is a new level in development of pediatric anesthesiology. This article is about advantages of regional pediatric anesthesia in intra- and post-surgery pain management and analgesia. We analyse the techniques of spinal and epidural anesthesia, as well as their varieties such as unipolar spinal block and caudal anesthesia, compare their advantages and disadvantages. Some more techniques such as paravertebral block, TAP-block are considered as an alternative to epidural anesthesia. Methods and possibilities of ilioinguinal, iliohypogastric and TAP-blocks are also mentioned here. The use of the above-mentioned methods allows to reduce the use of narcotic analgesics and hypnotics and, as a consequence, reduces their systemic effects on the child’s body. These methods are safer for use, since they allow you to plan a safe anesthetic for each child and minimize complications.

Transversus Abdominis Plane Block: An Updated Review of Anatomy and Techniques

Purpose of Review

Transversus abdominis plane (TAP) block is a regional technique for analgesia of the anterolateral abdominal wall. This review highlights the nomenclature system and recent advances in TAP block techniques and proposes directions for future research.

Recent Findings

Ultrasound guidance is now considered the gold standard in TAP blocks. It is easy to acquire ultrasound images; it can be used in many surgeries involving the anterolateral abdominal wall. However, the efficacy of ultrasound-guided TAP blocks is not consistent, which might be due to the use of different approaches. The choice of technique influences the involved area and block duration. To investigate the actual analgesic effects of TAP blocks, we unified the nomenclature system and clarified the definition of each technique. Although a single-shot TAP block is limited in duration, it is still the candidate of the analgesic standard for abdominal wall surgery because the use of the catheter technique and liposomal bupivacaine may overcome this limitation.

Summary

Ultrasound-guided TAP blocks are commonly used. With the unified nomenclature and the development of catheter technique and/or liposomal local anesthetics, TAP blocks can be applied more appropriately to achieve better pain control.

State of education regarding ultrasound-guided interventions during pain fellowships in Korea: a survey of recent fellows

Background

Recently, the use of ultrasound (US) techniques in regional anesthesia and pain medicine has increased significantly. However, the current extent of training in the use of US-guided pain management procedures in Korea remains unknown. The purpose of the present study was to assess the current state of US training provided during Korean Pain Society (KPS) pain fellowship programs through the comparative analysis between training hospitals.

Methods

We conducted an anonymous survey of 51 pain physicians who had completed KPS fellowships in 2017. Items pertained to current US practices and education, as well as the types of techniques and amount of experience with US-guided pain management procedures. Responses were compared based on the tier of the training hospital.

Results

Among the 51 respondents, 14 received training at first- and second-tier hospitals (Group A), while 37 received training at third-tier hospitals (Group B). The mean total duration of pain training during the 1-year fellowship was 7.4 months in Group A and 8.4 months in Group B. Our analysis revealed that 36% and 40% of respondents in Groups A and B received dedicated US training, respectively. Most respondents underwent US training in patient-care settings under the supervision of attending physicians. Cervical root, stellate ganglion, piriformis, and lumbar plexus blocks were more commonly performed by Group B than by Group A (P < 0.05).

Conclusions

Instruction regarding US-guided pain management interventions varied among fellowship training hospitals, highlighting the need for the development of educational standards that mandate a minimum number of US-guided nerve blocks or injections during fellowships in interventional pain management.

Ultrasonography Evaluation of Vulnerable Vessels Around Cervical Nerve Roots During Selective Cervical Nerve Root Block

Objective

To evaluate the prevalence of vulnerable blood vessels around cervical nerve roots before cervical nerve root block in the clinical setting.

Methods

This retrospective study included 74 patients with cervical radiculopathy who received an ultrasonography-guided nerve block at an outpatient clinic from July 2012 to July 2014. Before actual injection of the steroid was performed, we evaluated the vulnerable blood vessels around each C5, C6, and C7 nerve root of each patient's painful side, with Doppler ultrasound.

Results

Out of 74 cases, the C5 level had 2 blood vessels (2.7%), the C6 level had 4 blood vessels (5.45%), and the C7 level had 6 blood vessels (8.11%) close to each targeted nerve root. Moreover, the C5 level had 2 blood vessels (2.7%), the C6 level 5 blood vessels (6.75%), and the C7 level had 4 blood vessels (5.45%) at the site of an imaginary needle's projected pathway to the targeted nerve root, as revealed by axial transverse ultrasound imaging with color Doppler imaging. In total, the C5 level had 4 blood vessels (5.45%), the C6 level 9 blood vessels (12.16%), and the C7 level 10 had blood vessels (13.51%) either at the targeted nerve root or at the site of the imaginary needle's projected pathway to the targeted nerve root. There was an unneglectable prevalence of vulnerable blood vessels either at the targeted nerve root or at the site of the needle' projected pathway to the nerve root. Also, it shows a higher prevalence of vulnerable blood vessels either at the targeted nerve root or at the site of an imaginary needle's projected pathway to the nerve root as the spinal nerve root level gets lower.

Conclusion

To prevent unexpected critical complications involving vulnerable blood vessel injury during cervical nerve root block, it is recommended to routinely evaluate for the presence of vulnerable blood vessels around each cervical nerve root using Doppler ultrasound imaging before the cervical nerve root block, especially for the lower cervical nerve root level.

Randomized Controlled Trial for Evaluating the Analgesic Effect of Nalbuphine as an Adjuvant to Bupivacaine in Supraclavicular Block under Ultrasound Guidance

Introduction:

Benefits of regional anesthesia can be prolonged by adding adjuvants to local anesthetics. This study was designed to test the efficacy of adding nalbuphine to bupivacaine in supraclavicular brachial plexus blockade using ultrasound (US) guidance.

Methodology:

This was a prospective, randomized, double-blind study involving sixty patients of either sex undergoing elective orthopedic procedures of upper limb. In control Group C (n = 30), 30 mL of 0.375% bupivacaine + 1 mL normal saline and in study Group N (n = 30), 30 mL of 0.375% bupivacaine + 1 mL (10 mg) nalbuphine were used for giving supraclavicular block under US guidance. Parameters assessed were onset and duration of sensory and motor block, duration of analgesia (DOA), and any adverse events. Data between the groups were analyzed using independent t-test with SPSS 16.0 software.

Results:

In Group N, there was a statistically significant shorter time to onset of sensory blockade (4.89 ± 1.5 vs. 14.62 ± 1.73 min, P = 0.000), longer duration of sensory block (373.17 ± 15.56 min vs. 157.82 ± 11.02 min, P = 0.000), shorter onset time to achieve motor block (8.83 ± 1.9 min vs. 18.76 ± 1.75 min, P = 0.000), longer duration of motor block (313.92 ± 16.22 min vs. 121.87 ± 16.62 min, P = 0.000), and prolonged analgesia (389.33 ± 14.52 min vs. 171.65 ± 19.79 min, P = 0.000).

Conclusion:

Nalbuphine when added to bupivacaine as an adjuvant in supraclavicular block significantly shortened the onset of sensory and motor block and enhanced the duration of sensory and motor block and DOA.

Application of Ultrasound-Guided Ilioinguinal/Iliohypogastric Nerve Block in Pediatric Same-Day Surgery

The aim of this study was to evaluate the safety and efficacy of ultrasound-guided ilioinguinal/iliohypogastric nerve block (IINB) in pediatric patients undergoing same-day inguinal region surgery. Ninety patients aged 4-6 years, ASA levels I-II, were randomly divided into three groups: U, T, or C (n = 30 each). After basic anesthesia, patients in group U underwent ultrasound-guided IINB, those in group T underwent traditional Schulte-Steinberg IINB, and those in group C (controls) received intravenous anesthesia (ketamine-propofol) only. Patients who remained sensitive to intraoperative stimuli received additional intravenous doses of 1 mg/kg ketamine. Heart rate (HR), mean arterial pressure (MAP), and oxygen saturation (SPO2) were recorded upon entering the operating room (T0), at skin incision (T1), while pulling the hernia sac (T2), during skin closing (T3), and upon awakening (T4) at recovery. HR and MAP at T1, T2, and T4 were higher in group C than those in the other two groups, and recovery time in group C was significantly prolonged (P < 0.05). Group U required significantly lower quantities and frequency of ketamine injection, and pain scores in group U during awakening were lower than those in the other two groups (P < 0.05). Ultrasound-guided IINB provided an improved nerve block effect and postoperative analgesia, reduced the amount of local anesthetic required, facilitated more rapid postoperative recovery, and was a safe and effective method of anesthesia.

Toward competency-based curriculum: Application of workplace-based assessment tools in the National Saudi Arabian Anesthesia Training Program

Background:

The anesthesia training program of the Saudi Commission for health specialties has introduced a developed competency-based anesthesia residency program starting from 2015 with the utilization of the workplace-based assessment (WBA) tools, namely mini-clinical exercises (mini-CEX), direct observation of procedural skills (DOPS), and case-based discussion (CBD).

Objectives:

This work aimed to describe the process of development of anesthesia-specific list of mini-CEX, DOPS, and CBD tools within the Saudi Arabian Anesthesia Training Programs.

Materials and Methods:

To introduce the main concepts of formative WBA tools and to develop anesthesia-specific applications for each of the selected WBA tools, four 1-day workshops were held at the level of major training committees at eastern (Dammam), western (Jeddah), and central (Riyadh) regions in the Kingdom were conducted. Sixty-seven faculties participated in these workshops.

Results:

After conduction of the four workshops, the anesthesia-specific applications setting of mini-CEX, DOPS, and CBD tools among the 5-year levels were fully described. The level of the appropriate consultation skills was divided according to the case complexity adopted from the American Society of Anesthesiologists physical classification for adult and obstetric and pediatric patient as well as the type of the targeted anesthetic procedure.

Conclusion:

WBA anesthesia-specific lists of mini-CEX, DOPS, and CBD forms were easily incorporated first into guidelines to help the first stage of implementation of formative assessment in the Saudi Arabian Anesthesia Residency Program, and this can be helpful to replicate such program within other various training programs in Saudi Arabia and abroad.

The value of nerve blocks in the diagnoses and treatment of complex regional pain syndrome type 1: a series of 14 cases

OBJECTIVES

Complex regional pain syndrome type 1 (CRPS-1) can progress to joint stiffness, which may be related to pain and/or capsule-ligament contracture. In this context, it is difficult to distinguish the respective causative roles of pain and contractures. Nerve blocks (NBs) can be used to determine the aetiology of joint stiffness. Subsequent treatment will depend on whether contractures are present or not. The objective of the present study was to evaluate the diagnostic and therapeutic value of the nerve blocks in the management of joint stiffness caused by CRPS-1.

DESIGN OF THE STUDY

A retrospective case series.

METHODS

Implementation of NBs in subjects with joint stiffness caused by CRPS-1. Primary efficacy criterion: an increase in the range of joint movement. Secondary criteria: pain level, treatment decision, duration of therapeutic NBs, return to work.

RESULTS

Fourteen patients with joint stiffness underwent 17 NBs. Ten NBs (59%) were associated with the normalization of the range of joint movement (i.e. the absence of contractures and the presence of an isolated pain component), prompting the implementation of physical therapy during NBs ("therapeutic NBs") in 90% of these cases. Three NBs (18%) were associated with a partial increase in the range of joint movement (i.e. a background of joint stiffness due to a combination of pain and contracture), prompting the implementation of a therapeutic NB in all of these cases. Four NBs (23%) were not associated with any increase in the range of joint movement (i.e. pure contractures), prompting consultation with a surgeon in all of these cases. Forty-three percent of the patients have since returned to work.

CONCLUSIONS

Nerve block is a valuable diagnostic and therapeutic option in the management of joint stiffness caused by CRPS-1.

A presurvey and postsurvey of a web- and simulation-based course of ultrasound-guided nerve blocks for pediatric emergency medicine

OBJECTIVES

Fracture pain in the pediatric emergency department generally is treated with systemic analgesia using opioids. Fracture pain can alternatively be controlled with ultrasound (U/S)-guided nerve blocks for which only minimal training is available to pediatric emergency medicine physicians. This study evaluated the effects of a Web- and half-day simulation-based U/S course. Outcome measures were physician comfort level with and intention to use U/S-guided nerve blocks in clinical practice.

METHODS

We conducted a presurvey and postsurvey study targeting pediatric emergency medicine physicians. Participants completed a Web-based tutorial and a half-day simulation program. Participants completed survey questionnaires to document their comfort level and intention to use U/S-guided nerve blocks. Questionnaires were completed before, immediately after, and 1 month after course.

RESULTS

Eleven physicians participated in the study. The participants' comfort with and intention to use U/S-guided ulnar and femoral nerve blocks increased immediately after course, but neither increase was sustained 1 month after course. Immediately following the course, participants reported that the course addressed their learning needs (91%) and that they would consider advanced training (91%). One month after course, participants reported that they would partake in refresher courses (82%), particularly if offered once per year (64%).

CONCLUSIONS

This study suggests that Web- and simulation-based learning can increase comfort and intention to use U/S-guided nerve blocks and the need for follow-on training. Participants reported that their learning needs were met but that they would need annual refresher courses.

Achieving change in practice by using unembalmed cadavers to teach ultrasound-guided regional anaesthesia

We are at risk of teaching our trainees to be ‘image-seekers’. Sonoanatomy is easily demonstrated but teaching the practical skills of ultrasound-guided nerve block constitutes a greater challenge. Participants may return to their institutions after attending educational courses as proficient ‘image-seekers’, yet still unsure about performing nerve blocks. Safe ultrasound-guided regional anaesthesia (USGRA) requires integration of several skills. These are correct image acquisition, accurate needle guidance and appropriate spread of local anaesthesia. Most educational courses cannot combine all these skills. We describe realtime nerve blocks on cadavers to teach USGRA. Unembalmed cadavers offer more realistic imaging and tactile needle feedback than other models. We evaluated participants' perceptions of cadavers for training, their impact on confidence and whether subsequent change in practice occurred. Fifty participants completed pre- and post-training questionnaires and were followed up at three months. Confidence was scored on a five-point scale. Complete data-sets were received from 42 participants (84%). Most (98%) found the cadavers to be of educational benefit and 86% found the imaging and tissue properties comparable to clinical practice. Mean (±SD) confidence score increased from 1.7 (±0.92) precourse to 4.3 (±0.65) postcourse ( P < 0.0001). At three-month follow-up, 84% considered they had received sufficient training to introduce ultrasound into their clinical practice and 87% (27% precourse) now used ultrasound routinely. Only four participants had not made a change to their practice.

Real-time 3-dimensional ultrasound-assisted infraclavicular brachial plexus catheter placement: implications of a new technology

Background. There are a variety of techniques for targeting placement of an infraclavicular blockade; these include eliciting paresthesias, nerve stimulation, and 2-dimensional (2D) ultrasound (US) guidance. Current 2D US allows direct visualization of a “flat” image of the advancing needle and neurovascular structures but without the ability to extensively analyze multidimensional data and allow for real-time manipulation. Three-dimensional (3D) ultrasonography has gained popularity and usefulness in many clinical specialties such as obstetrics and cardiology. We describe some of the potential clinical applications of 3D US in regional anesthesia. Methods. This case represents an infraclavicular catheter placement facilitated by 3D US, which demonstrates 360-degree spatial relationships of the entire anatomic region. Results. The block needle, peripheral nerve catheter, and local anesthetic diffusion were observed in multiple planes of view without manipulation of the US probe. Conclusion. Advantages of 3D US may include the ability to confirm correct needle and catheter placement prior to the injection of local anesthetic. The spread of local anesthetic along the length of the nerve can be easily observed while manipulating the 3D images in real-time by simply rotating the trackball on the US machine to provide additional information that cannot be identified with 2D US alone.

Ultrasound in regional anaesthesia

Ultrasound guidance is rapidly becoming the gold standard for regional anaesthesia. There is an ever growing weight of evidence, matched with improving technology, to show that the use of ultrasound has significant benefits over conventional techniques, such as nerve stimulation and loss of resistance. The improved safety and efficacy that ultrasound brings to regional anaesthesia will help promote its use and realise the benefits that regional anaesthesia has over general anaesthesia, such as decreased morbidity and mortality, superior postoperative analgesia, cost-effectiveness, decreased postoperative complications and an improved postoperative course. In this review we consider the evidence behind the improved safety and efficacy of ultrasound-guided regional anaesthesia, before discussing its use in pain medicine, paediatrics and in the facilitation of neuraxial blockade. The Achilles' heel of ultrasound-guided regional anaesthesia is that anaesthetists are far more familiar with providing general anaesthesia, which in most cases requires skills that are achieved faster and more reliably. To this ends we go on to provide practical advice on ultrasound-guided techniques and the introduction of ultrasound into a department.