Diabetic Neuropathy: Pathophysiology Review

PURPOSE OF REVIEW

Diabetic neuropathy is a debilitating complication of diabetes mellitus that affects millions of individuals worldwide. It is characterized by nerve damage resulting from prolonged exposure to high blood glucose levels. Diabetic neuropathy may cause a range of symptoms, including pain, numbness, muscle weakness, autonomic dysfunction, and foot ulcers, potentially causing significant impairment to the quality of life for those affected. This review article aims to provide a comprehensive overview of the pathophysiology of diabetic neuropathy. The etiology of diabetic neuropathy will be discussed, including risk factors, predisposing conditions, and an overview of the complex interplay between hyperglycemia, metabolic dysregulation, and nerve damage. Additionally, we will explore the molecular mechanisms and pathways of diabetic neuropathy, including the impact of hyperglycemia on nerve function, abnormalities in glucose metabolism, the role of advanced glycation end products (AGEs), and inflammatory and immune-mediated processes. We will provide an overview of the various nerve fibers affected by diabetic neuropathy and explore the common symptoms and complications associated with diabetic neuropathy in the pain medicine field.

RECENT FINDINGS

This review highlights advances in understanding the pathophysiology of diabetic neuropathy as well as reviews potential novel therapeutic strategies and promising areas for future research. In conclusion, this review article aims to shed light on the pathophysiology of diabetic neuropathy, its far-reaching consequences, and the evolving strategies for prevention and management. In understanding the mechanisms of diabetic neuropathy and the ongoing research in this area, healthcare professionals can better serve patients with diabetes, ultimately improving well-being and reducing complications.

Deep parasternal intercostal plane nerve block: an anatomical study

INTRODUCTION

The superficial and deep parasternal intercostal plane (DPIP) blocks are two new blocks for thoracic pain. There are limited cadaveric studies evaluating the dye spread with these blocks. In this study, we examined the dye spread of an ultrasound-guided DPIP block in a human cadaveric model.

METHODS

Five ultrasound-guided DPIP blocks were performed in four unembalmed human cadavers using an in-plane approach with a linear transducer oriented in a transverse plane adjacent to the sternum. Twenty milliliters of 0.1% methylene blue were injected between ribs 3 and 4 into the plane deep to the internal intercostal muscles and superficial to the transversus thoracis muscle layer. The chest muscles were dissected, and the extent of dye spread was documented in both cephalocaudal and mediolateral directions.

RESULTS

The transversus thoracis muscle slips were stained in all cadavers from 4 to 6 levels. Intercostal nerves were dyed in all specimens. Four levels of intercostal nerves were dyed in each specimen with variability in number of levels stained above and below the level of the injection.

CONCLUSIONS

The DPIP block spreads along the tissue plane above the transversus thoracis muscles to multiple levels to dye the intercostal nerves in this cadaver study. This block may be of clinical value for analgesia in anterior thoracic surgical procedures.

Acupuncture as a Complementary Treatment Modality in the Post-Anesthesia Care Setting: A Feasibility Study

Introduction: Postoperative pain management and postoperative nausea and vomiting are a persistent challenge for both health care providers and patients. Acupuncture is an effective and safe modality for the management of pain and nausea, and has the potential to play a key role in postoperative pain management. This study explores the utility and feasibility of acupuncture in the immediate postoperative setting. Methods: In a retrospective case-control study, 22 patients who underwent elective surgeries and received acupuncture in the post-anesthesia care unit (PACU) were compared with 88 case controls. Indications for acupuncture therapy included persistent pain, nausea, or anxiety. Patient satisfaction and symptom improvement after acupuncture were assessed. PACU nurses and patients were queried on their perspectives on using this therapy. Demographic data, perioperative opioid consumption, pain score in the PACU, incidence of postoperative nausea, PACU length of stay, and unintended hospital admission were assessed. The groups with/without acupuncture were compared using Wilcoxon rank sum test or Fisher's exact test as appropriate. Results: A total of 78.9% of patients receiving acupuncture felt improvement in their symptoms. 94.7% of recovery nurses who cared for patients who received acupuncture felt that it was helpful and 78.9% did not believe it was disruptive. Patients who opted for acupuncture had a statistically significant higher overall median (interquartile range) pain score in the PACU (7.0 [5.2, 9.5] vs. 5.0 [3.0, 7.0], p = 0.009) and higher postoperative opioid consumption (22.5 [9.8, 44.8] vs. 15.0 [0.0, 30.0], p = 0. 03). There was no difference between total perioperative opioid consumption between groups (p = 0.94). Conclusions: Most patients who received acupuncture therapy in the PACU were satisfied with their therapy and would recommend it to future patients undergoing surgery. Most recovery nurses felt it was helpful, was not disruptive, and would like to see it utilized in the PACU.

Women Representation in Anesthesiology Society Leadership Positions

BACKGROUND

Although the number of women in medicine has increased, women remain underrepresented in leadership positions, specifically in medical societies. Specialty societies in medicine are influential in networking, career advancement, research and education opportunities, and providing awards and recognition. The goals of this study are to examine the representation of women in leadership positions in anesthesiology societies compared to women society members and women anesthesiologists and to analyze the trend in women society presidents over time.

METHODS

A list of anesthesiology societies was obtained from the American Society of Anesthesiology (ASA) website. Society leadership positions were obtained via the societies' websites. Gender was determined by images on the society website and images or pronouns on hospital websites and research databases. The percentage of women presidents, vice presidents/presidents-elect, secretaries/treasurers, board of directors/council members, and committee chairs was calculated. The percentage of women in society leadership positions was compared to the percentage of women society members when available, and the percentage of women anesthesiologists in the workforce (26%) using binomial difference of unpaired proportions tests. The trend of women presidents from 1980 to 2020 was analyzed using a Cochran-Armitage trend test.

RESULTS

A total of 13 societies were included in this study. Overall, women held 32.6% (189/580) of leadership positions. 38.5% (5/13) of presidents, 17.6% (3/17) of presidents-elect/vice presidents, and 45% (9/20) of secretaries/treasurers were women. In addition, 30.0% (91/303) of board of directors/council members and 34.2% (90/263) of committee chairs were women. The percentage of women holding society leadership positions was significantly greater than the percentage of women anesthesiologists in the workforce ( P < .001), as was the percentage of women as committee chairs ( P = .003). The percentage of women society members was available for 9 of 13 societies (69%), and the percentage of women leaders was similar to the percentage of women society members ( P = .10). There was a significant difference in the percentage of women leaders between society size categories. Small societies had 32.9% (49/149) women leaders, medium had 39.4% (74/188) women leaders, and the single large society had 27.2% (66/243) ( P = .03). There were also significantly more women leaders in the Society of Cardiovascular Anesthesiologists (SCA) than there are women members ( P = .02).

CONCLUSIONS

This study suggests that anesthesia societies may be more inclusive of women in leadership positions compared to other specialty societies. Although in anesthesiology, women remain underrepresented in academic leadership roles, there is a higher proportion of women in leadership roles in anesthesiology societies than proportion of women in the anesthesia workforce.

Standardizing nomenclature in regional anesthesia: an ASRA-ESRA Delphi consensus study of upper and lower limb nerve blocks

BACKGROUND

Inconsistent nomenclature and anatomical descriptions of regional anesthetic techniques hinder scientific communication and engender confusion; this in turn has implications for research, education and clinical implementation of regional anesthesia. Having produced standardized nomenclature for abdominal wall, paraspinal and chest wall regional anesthetic techniques, we aimed to similarly do so for upper and lower limb peripheral nerve blocks.

METHODS

We performed a three-round Delphi international consensus study to generate standardized names and anatomical descriptions of upper and lower limb regional anesthetic techniques. A long list of names and anatomical description of blocks of upper and lower extremities was produced by the members of the steering committee. Subsequently, two rounds of anonymized voting and commenting were followed by a third virtual round table to secure consensus for items that remained outstanding after the first and second rounds. As with previous methodology, strong consensus was defined as ≥75% agreement and weak consensus as 50%-74% agreement.

RESULTS

A total of 94, 91 and 65 collaborators participated in the first, second and third rounds, respectively. We achieved strong consensus for 38 names and 33 anatomical descriptions, and weak consensus for five anatomical descriptions. We agreed on a template for naming peripheral nerve blocks based on the name of the nerve and the anatomical location of the blockade and identified several areas for future research.

CONCLUSIONS

We achieved consensus on nomenclature and anatomical descriptions of regional anesthetic techniques for upper and lower limb nerve blocks, and recommend using this framework in clinical and academic practice. This should improve research, teaching and learning of regional anesthesia to eventually improve patient care.

Evaluating two approaches to the erector spinae plane block: an anatomical study

BACKGROUND AND OBJECTIVES

Studies show variable spread with thoracic erector spinae plane (ESP) injections. Injection sites vary from lateral end of the transverse process (TP) to 3 cm from the spinous process, with many not describing the precise site of injection. This human cadaveric study examined dye spread of ultrasound-guided thoracic ESP block at two needle locations.

METHODS

Ultrasound-guided ESP blocks were performed on unembalmed cadavers. Methylene blue (20 mL, 0.1%) was injected in the ESP at the medial TP at level T5 (medial transverse process injection (MED), n=7) and the lateral end of the TP between T4 and T5 (injection between transverse processes (BTWN), n=7). The back muscles were dissected, and the cephalocaudal and medial-lateral dye spread documented.

RESULTS

Dye spread cephalocaudally from C4-T12 in the MED group and C5-T11 in the BTWN group, and laterally to the iliocostalis muscle in five MED injections and all BTWN injections. One MED injection reached serratus anterior. Dorsal rami were dyed in five MED and all BTWN injections. Dye spread to the dorsal root ganglion and dorsal root in most injections, though more extensively in the BTWN group. The ventral root was dyed in 4 MED and 6 BTWN injections. Epidural spread in BTWN injections ranged from 3 to 12 levels (median: 5 levels), with contralateral spread in two cases and intrathecal spread in five injections. Epidural spread in MED injections was less extensive (median (range): 1 (0-3) levels); two MED injections did not enter the epidural space.

CONCLUSION

An ESP injection administered between TPs exhibits more extensive spread than a medial TP injection in a human cadaveric model.

Addressing Bias in Acute Postoperative Pain Management

PURPOSE OF REVIEW

This review evaluates disparities in acute postoperative pain management with regard to gender, race, socioeconomic status, age, and language. Strategies for addressing bias are also discussed.

RECENT FINDINGS

Inequities in acute postoperative pain management may lead to longer hospital stays and adverse health outcomes. Recent literature suggests that there are disparities in acute pain management related to patient gender, race, and age. Interventions to address these disparities are reviewed but require further investigation. Recent literature highlights inequities in postoperative pain management, particularly in relation to gender, race, and age. There is a need for continued research in this area. Strategies such as implicit bias training and using culturally competent pain measurement scales may help reduce these disparities. Continued efforts by both providers and institutions to address and eliminate biases in postoperative pain management are needed to ensure better health outcomes.

Cannabis for the Treatment of Fibromyalgia: A Systematic Review

Fibromyalgia is a common disease syndrome characterized by chronic pain and fatigue in conjunction with cognitive dysfunction such as memory difficulties. Patients currently face a difficult prognosis with limited treatment options and a diminished quality of life. Given its widespread use and potential efficacy in treating other types of pain, cannabis may prove to be an effective treatment for fibromyalgia. This review aims to examine and discuss current clinical evidence regarding the use of cannabis for the treatment of fibromyalgia. An electronic search was conducted on MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, and Scopus using Medical Subject Heading (MeSH) terms on all literature published up to October 2022. A follow-up manual search included a complete verification of relevant studies. The results of four randomized controlled trials (RCTs) and five observational studies (a total of 564 patients) that investigated the effects of cannabis on fibromyalgia symptoms were included in this review. Of the RCTs, only one demonstrated that cannabinoids did not have a different effect than placebo on pain responses. Overall, this analysis shows low-quality evidence supporting short-term pain reduction in people with fibromyalgia treated with cannabinoid therapeutics. Although current evidence is limited, medical cannabis appears to be a safe alternative for treating fibromyalgia.

Diabetes insipidus related to sedation in the intensive care unit: A review of the literature

PURPOSE

To identify cases of diabetes insipidus (DI) related to sedation in the ICU to determine which medications pose the greatest risk and understand patterns of presentation.

MATERIALS AND METHODS

We searched PubMed, Embase, Scopus, Google Scholar, and Web of Science. Search terms included "polyuria," "diabetes insipidus," "hypnotics and sedatives," "sedation," as well as individual medications. Case reports or series involving DI or polyuria related to sedation in the ICU were identified.

RESULTS

We identified 21 cases of diabetes insipidus or polyuria in the ICU attributed to a sedative. Dexmedetomidine was implicated in 42.9% of cases, followed by sevoflurane (33.3%) and ketamine (23.8%). Sevoflurane was implicated in all 7 cases in which it was used (100%; 95% CI 59.0%, 100.0%), dexmedetomidine in 9 of 11 cases (81.8%; 95% CI 48.2, 97.7), and ketamine in 5 of 9 cases (55.6%; 95% CI 21.2%, 86.3%).

CONCLUSIONS

Awareness of the potential for sedatives to cause DI may lead to greater identification with swifter medication discontinuation and subsequent resolution of DI.

Evaluating the Anatomic Spread of Selective Nerve Scalp Blocks Using Methylene Blue: A Cadaveric Analysis

BACKGROUND

The modern scalp block consists of local anesthesia injections that target the supraorbital, supratrochlear, zygomaticotemporal, auriculotemporal, and greater and lesser occipital nerves. Limited data exist on the local anesthetic spread that occurs with this technique. This study examines the extent of the spread of a scalp block using methylene blue in a cadaveric model.

METHODS

A traditional landmark-based scalp block was performed on 6 unembalmed human cadavers using 25-G, 1.5-inch needles to inject 1 to 2 mL of methylene blue 0.1% at each nerve bilaterally; a total volume of 20 mL was injected. The cadavers were then dissected, and the spread of injectate was measured and recorded.

RESULTS

All the nerves required for analgesic coverage were appropriately stained by the injections, except for in 2 specimens where the lesser occipital nerve could not be identified. The zygomatic (stained in 2 of 8 specimens) and temporal (stained in 5 of 8 specimens) branches of the facial nerve were stained as a result of the zygomaticotemporal and/or auriculotemporal injections. Tracking from the zygomatic injection site was noted as far inferior as the temporalis muscle attachments on the mandible.

CONCLUSIONS

This cadaveric study confirms that the landmark-based technique for scalp blocks consistently stained all 6 nerves involved in scalp innervation. There was significant unintentional spread to the branches of the facial nerve when using the landmark technique.

Dexmedetomidine-associated diabetes insipidus during skull base surgery in a pediatric patient

Diabetes insipidus is characterized by polyuria due to an inability to auto-regulate water balance resulting in dangerous metabolic derangements. Intraoperative anesthetics have been increasingly identified as a cause of diabetes insipidus in adult patients; however, it is rare in pediatrics. We present a case of a 16-year-old male undergoing resection of a recurrent left juvenile nasopharyngeal angiofibroma who experienced intraoperative polyuria concerning diabetes insipidus. Urine output drastically decreased following discontinuation of dexmedetomidine with complete resolution within 24 h. We conclude that this case of transient diabetes insipidus was associated with dexmedetomidine administration.

2023 American Society of Anesthesiologists Practice Guidelines for Preoperative Fasting: Carbohydrate-containing Clear Liquids with or without Protein, Chewing Gum, and Pediatric Fasting Duration-A Modular Update of the 2017 American Society of Anesthesiologists Practice Guidelines for Preoperative Fasting

These practice guidelines are a modular update of the "Practice guidelines for preoperative fasting and the use of pharmacologic agents to reduce the risk of pulmonary aspiration: Application to healthy patients undergoing elective procedures." The guidance focuses on topics not addressed in the previous guideline: ingestion of carbohydrate-containing clear liquids with or without protein, chewing gum, and pediatric fasting duration.

Parental Leave Policies in the Top 20 US Hospitals: A Call for Inclusivity and Improvement

Objective

To evaluate and compare parental leave policies from the top United States (US) hospitals with a focus on inclusivity of all types of parents.

Methods

In September and October of 2021, the parental leave policies of the top 20 US hospitals, ranked by the 2021 US News & World report, were evaluated. Parental leave policies were obtained and reviewed through the hospitals' public websites. Hospitals' Human Relations (HR) departments were contacted to confirm the policies. Hospital policies were scored against a rubric created by the authors.

Results

Among the top US hospitals (21 total hospitals), 17 (81%) had publicly available policies, and one policy was obtained by contacting HR. Fourteen of the 18 hospitals (77.8%) had a parental leave policy distinctive from short-term disability and offered paid paternity or partner leave. Thirteen hospitals (72.2%) offered parental leave for parents whose children were carried through surrogacy. Fourteen hospitals (77.8%) included adoptive parents; however, only five hospitals (27.8%) specifically included foster parents. The average paid leave for birthing mothers was 7.9 weeks compared to 6.6 weeks for nonbirthing parents. Only three hospitals offered the same leave for birthing and nonbirthing parents.

Conclusion

While a few of the top 20 hospitals have paid parental leave policies that are inclusive and equivalent to all parents, many do not and represent an area for improvement. As healthcare industry leaders, these hospitals should strive for inclusive parental leave policies that care for their employees with the same high standards they set for caring for patients.

Prepectoral Breast Reconstruction Reduces Opioid Consumption and Pain After Mastectomy: A Head-to-Head Comparison With Submuscular Reconstruction

BACKGROUND

Acute pain after mastectomy is increased with concurrent breast reconstruction. One postulated advantage of prepectoral breast reconstruction is less postoperative pain; however, no comparisons to partial submuscular reconstruction have been made to date. Here, we examined the postoperative pain experienced between patients with prepectoral and subpectoral breast reconstruction after mastectomy.

METHODS

We performed a retrospective chart review of all patients undergoing immediate breast reconstruction with tissue expanders from 2012 to 2019 by a single plastic surgeon. Patient demographics, surgical details, and anesthetic techniques were evaluated, and our primary outcome compared postoperative opioid usage between prepectoral and subpectoral reconstructions. Our secondary outcome compared pain scores between techniques.

RESULTS

A total of 211 subpectoral and 117 prepectoral reconstruction patients were included for analysis. Patients with subpectoral reconstructions had higher postoperative opioid usage (80.0 vs 45.0 oral morphine equivalents, P < 0.001). Subpectoral patients also recorded higher maximum pain scores compared with prepectoral reconstructions while admitted (7 of 10 vs 5 of 10, P < 0.004). Multivariable linear regression suggests that mastectomy type and subpectoral reconstruction were significant contributors to postoperative opioid use (P < 0.05).

CONCLUSIONS

Prepectoral breast reconstruction was associated with less postoperative opioid consumption and lower postoperative pain scores as compared with subpectoral reconstruction, when controlling for other surgical and anesthesia factors. Future randomized controlled trials are warranted to study how postoperative pain and chronic pain are influenced by the location of prosthesis placement in implant-based postmastectomy breast reconstruction.

Epidural bupivacaine administration after infiltration of liposomal bupivacaine for transversalis fascia plane block: A case report

Extended-release liposomal bupivacaine is frequently used in surgical infiltration for postoperative pain control. The manufacturer recommends against subsequent local anesthetics within 96 hours. We administered epidural bupivacaine one day after local liposomal bupivacaine infiltration for staged hemipelvectomy without symptoms of LAST. Further pharmacokinetic and clinical safety studies are needed.

Patient Attitudes Toward Acupuncture in the Perioperative Setting

Introduction: Acupuncture is a potential treatment option for pain, nausea, vomiting, anxiety, and agitation in the perioperative period. Patient preference for participating in acupuncture in the perioperative period is not well understood. The aim of this study was to quantify patient interest in perioperative acupuncture, explore the relationship between acupuncture interest, insurance coverage and patient cost, and identify clinical factors associated with patient interest in acupuncture. Materials and Methods: Adult patients evaluated in the Preoperative Evaluation Clinic at the Mayo Clinic in Phoenix, AZ, between June 2019 and July 2019, received a voluntary survey to assess their attitudes toward receiving acupuncture in the perioperative period. Patient interest in acupuncture to help treat pain, anxiety, and postoperative nausea and vomiting, as well as their willingness to pay for such services, were assessed. Demographic data, American Society of Anesthesiologists (ASA) physical class, scheduled procedure, and insurance coverage were extracted from the medical record. Univariate analysis was performed to estimate interest in acupuncture. Results: Three hundred and seven respondents were included in this study with a response rate of 60.4%. A total of 68.4% of study participants were interested in receiving perioperative acupuncture. Of those interested in acupuncture, 86.7% were interested if acupuncture was offered at no cost (either free or fully covered by insurance). A total of 47.1% of those patients interested in acupuncture would be interested if the cost of acupuncture was between 20 and 50 U.S. dollars. A total of 8.6% would be interested in acupuncture if patients were expected to pay the full cost of treatment (estimated 175 U.S. dollars). Age, sex, ASA status, type of surgery, risk of procedure, and Medicare/Medicaid coverage were not statistically associated with interest in acupuncture. Conclusions: When there is little to no direct cost to the patient, the majority of patients are interested in acupuncture in the perioperative period.

Reviving the medical lecture: practical tips for delivering effective lectures

Large group lectures, which are widely used in continuing medical education, are susceptible to pitfalls that can negatively impact their effectiveness. In this article, we describe evidence-based best practices from the educational literature that can revive the medical lecture as an effective educational tool. We provide practical tips for both developing and delivering lectures, emphasizing the key role that learning objectives can and should have in the development of lectures, the importance of organization, effective use of visuals and application of restraint in slide design. Pause techniques to authentically engage the audience are described. We also provide practical tips for promoting attention in virtual presentations.

Patient safety education in anesthesia: current state and future directions

PURPOSE OF REVIEW

Although patient safety is a core component of education in anesthesiology, approaches to implementation of education programs are less well defined. The goal of this review is to describe the current state of education in anesthesia patient safety and the ideal patient safety curriculum.

RECENT FINDINGS

Anesthesiology has been a pioneer in patient safety for decades, with efforts amongst national organizations, such as the American Society of Anesthesiologists and the Anesthesia Patient Safety Foundation to disseminate key standards and guidelines in patient safety. However, few, if any strategies for implementation of a patient safety curriculum in anesthesiology exist.

SUMMARY

Patient safety education is crucial to the field of anesthesiology, particularly with the advancement of surgical and anesthesia technologies and increasing complexity of patients and procedures. The ideal patient safety curriculum in anesthesiology consists of simulation, adverse event investigation and analysis, and participation in process improvement. Efforts in education must adapt with changing technology, shifts in the way anesthesia care is delivered, and threats to physician wellness. Future efforts in education should harness emerging platforms, such as social media, podcasts, and wikis.

Anesthetic Considerations for Patients on Psychotropic Drug Therapies

Psychotropic drugs are used in the treatment of psychiatric and non-psychiatric conditions. Many patients who are on psychotropic medications may present for procedures requiring anesthesia. Psychotropic medications can have dangerous interactions with drugs commonly used in anesthesia, some of which can be life-threatening. In this review, we describe the current anesthetic considerations for patients on psychotropic drug therapies, including antidepressants, antipsychotics, mood stabilizers, anxiolytics, and stimulants. The pharmacology, side effects, and potential drug interactions of the commonly prescribed psychotropic drug therapies with anesthetic agents are described. Further, we highlight the current recommendations regarding the cessation and continuation of these medications during the perioperative period.

Enhanced recovery after surgery protocol and postoperative opioid prescribing for cesarean delivery: an interrupted time series analysis

INTRODUCTION

Enhanced recovery after surgery (ERAS) pathways have emerged as a promising strategy to reduce postoperative opioid use and decrease the risk of developing new persistent opioid use in surgical patients. However, the association between ERAS implementation and discharge opioid prescribing practices is unclear.

STUDY DESIGN

We conducted a retrospective observational quasi-experimental study of opioid-naïve patients aged 18+ undergoing cesarean delivery between February 2015 and December 2019 at a large academic center. An interrupted time series analysis (ITSA) was used to model the changes in pain medication prescribing associated with the implementation of ERAS to account for pre-existing temporal trends.

RESULTS

Among the 1473 patients (out of 2249 total) who underwent cesarean delivery after ERAS implementation, 80.72% received a discharge opioid prescription vs. 95.36% at baseline. Pre-ERAS daily oral morphine equivalents (OME) on the discharge prescription decreased by 0.48 OME each month (p<0.01). There was a level shift of 35 more OME prescribed (p<0.01), followed by a monthly decrease of 1.4 OMEs per month after ERAS implementation (p<0.01). Among those who received a prescription, 61.35% received a total daily dose greater than 90 OME compared to 11.35% pre-implementation (p<0.01), while prescriptions with a total daily dose less than 50 OME decreased from 79.86 to 25.85% after ERAS implementation(p<0.01).

CONCLUSION

Although ERAS implementation reduced the overall proportion of patients receiving a discharge opioid prescription after cesarean delivery, for the subset of patients receiving an opioid prescription, ERAS implementation may have inadvertently increased the prescribing of daily doses greater than 90 OME. This finding highlights the importance of early and continued evaluation after new policies are implemented.

Intraoperative fluid management and kidney transplantation outcomes: A retrospective cohort study

BACKGROUND

Patients undergoing kidney transplantation traditionally receive liberal amounts of fluid during surgery. However, excessive fluids can lead to fluid overload and ileus. In this retrospective cohort study, we compared the effect of restrictive versus liberal fluid therapy on kidney transplantation outcomes.

METHODS

Patients who underwent deceased-donor kidney transplantation at Mayo Clinic from January 2014 to March 2019 were included. Those who received <3 L of intravenous fluids intraoperatively were categorized as "restrictive;" those who received ≥3 L were categorized as "liberal." The primary outcome was incidence of delayed graft function (DGF). Secondary outcomes included length of stay, readmission within 30 days, time to return of bowel function, and incidence of postoperative complications.

RESULTS

Of the 1171 patients included, 557 were in the restrictive group and 614 in the liberal group. The mean (SD) fluid intake was 2.17 (.54) L in the restrictive group and 3.67 (.68) L in the liberal group (P<.001). There was no difference in DGF (relative risk, 1.03; P = .56), length of stay (P = .34), readmission (P = .80), return of bowel function (P = .71), or other postoperative complications.

CONCLUSIONS

Intraoperative restrictive fluid therapy during kidney transplantation was not associated with DGF or worse outcomes when compared with liberal fluid therapy.

Perioperative Diabetes Insipidus Caused by Anesthetic Medications: A Review of the Literature

Diabetes insipidus (DI) is an uncommon perioperative complication that can occur secondary to medications or surgical manipulation and can cause significant hypovolemia and electrolyte abnormalities. We reviewed and evaluated the current literature and identified 24 cases of DI related to medications commonly used in anesthesia such as propofol, dexmedetomidine, sevoflurane, ketamine, and opioids. This review summarizes the case reports and frequency of DI with each medication and presents possible pathophysiology. Medication-induced DI should be included in the differential diagnosis when intraoperative polyuria is identified. Early identification, removal of the agent, and treatment of intraoperative DI are critical to minimize complications.

Evaluating the spread of costoclavicular brachial plexus block: an anatomical study

BACKGROUND AND OBJECTIVES

The costoclavicular brachial plexus block is performed deep and posterior to the midpoint of the clavicle. There are limited data evaluating the spread of the costoclavicular brachial plexus block. We performed a cadaveric study to evaluate the spread of injectate after a costoclavicular brachial plexus block.

METHODS

Five ultrasound-guided costoclavicular block injections were performed with 20 mL of 0.1% methylene blue. The brachial plexus and its branches were dissected from the level of C4 to the lower axilla. The extent of dye spread was recorded including spread to the phrenic nerve, suprascapular nerve, roots, trunks, divisions, cords and terminal branches of the brachial plexus.

RESULTS

The dye extended cephalad to the level of the cricoid cartilage in two of the five injections; three injections had dye extending 0.75 cm, 1.5 cm and 2 cm caudad to the level of the cricoid cartilage, respectively. The C7, C8 and T1 nerve roots were stained in all injections. The dye did not extend cephalad to the C5 and C6 nerve roots. All trunks, cords and divisions of the brachial plexus were stained, as was the suprascapular nerve. There was no spread of dye to the phrenic nerve in any of the specimens.

CONCLUSIONS

This cadaveric study demonstrates that ultrasound-guided injection in the costoclavicular space spreads cephalad to the brachial plexus in the supraclavicular space, consistently reaching the suprascapular nerve and all trunks and cords of the brachial plexus, while sparing the phrenic nerve.

Evaluating the extent of lumbar erector spinae plane block: an anatomical study

Background and objectives

The erector spinae plane (ESP) block is a relatively new interfascial block technique. Previous cadaveric studies have shown extensive cephalocaudal spread with a single ESP injection at the thoracic level. However, little data exist for lumbar ESP block. The objective of this study was to examine the anatomical spread of dye following an ultrasound-guided lumbar ESP block in a human cadaveric model.

Methods

An ultrasound-guided ESP block was performed in unembalmed human cadavers using an in-plane approach with a curvilinear transducer oriented longitudinally. 20 mL of 0.166% methylene blue was injected into the plane between the distal end of the L4 transverse process and erector spinae muscle bilaterally in four specimens and unilaterally in one specimen (nine ESP blocks in total). The superficial and deep back muscles were dissected, and the extent of dye spread was documented in both cephalocaudal and medial–lateral directions.

Results

There was cephalocaudal spread from L3 to L5 in all specimens with extension to L2 in four specimens. Medial–lateral spread was documented from the multifidus muscle to the lateral edge of the thoracolumbar fascia. There was extensive dye in and around the erector spinae musculature and spread to the dorsal rami in all specimens. There was no dye spread anteriorly into the dorsal root ganglion, ventral rami, or paravertebral space.

Conclusions

A lumbar ESP injection has limited craniocaudal spread compared with injection in the thoracic region. It has consistent spread to dorsal rami, but no anterior spread to ventral rami or paravertebral space.

Dexmedetomidine in Enhanced Recovery After Surgery (ERAS) Protocols for Postoperative Pain

PURPOSE OF REVIEW

Effective acute pain management has evolved considerably in recent years and is a primary area of focus in attempts to defend against the opioid epidemic. Persistent postsurgical pain (PPP) has an incidence of up to 30-50% and has negative outcome of quality of life and negative burden on individuals, family, and society. The 2016 American Society of Anesthesiologists (ASA) guidelines states that enhanced recovery after surgery (ERAS) forms an integral part of Perioperative Surgical Home (PSH) and is now recommended to use a multimodal opioid-sparing approach for management of postoperative pain. As such, dexmedetomidine is now being used as part of ERAS protocols along with regional nerve blocks and other medications, to create a satisfactory postoperative outcome with reduced opioid consumption in the Post anesthesia care unit (PACU).

RECENT FINDINGS

Dexmedetomidine, a selective alpha2 agonist, possesses analgesic effects and has a different mechanism of action when compared with opioids. When dexmedetomidine is initiated at the end of a procedure, it has a better hemodynamic stability and pain response than ropivacaine. Dexmedetomidine can be used as an adjuvant in epidurals with local anesthetic sparing effects. Its use during nerve blocks results in reduced postoperative pain. Also, local infiltration of IV dexmedetomidine is associated with earlier discharge from PACU. Perioperative use of dexmedetomidine has significantly improved postoperative outcomes when used as part of ERAS protocols. An in-depth review of the use of dexmedetomidine in ERAS protocols is presented for clinical anesthesiologists.

Teaching Systems Improvement to Early Medical Students: Strategies and Lessons Learned

PURPOSE

Despite increasing emphasis in medical school education on quality and systems improvement, many medical schools lack sufficient faculty with expertise to teach systems improvement. Using the pedagogical content knowledge framework, this study explores how faculty engage students in systems improvement work and faculty perceptions of the outcomes for the health system and students.

METHOD

In May-June 2017, the authors interviewed 12 of 13 invited faculty with experience in teaching and engaging first-year medical students in systems improvement work, the course of students' systems improvement work over time, the impact of students' projects on health systems, and students' learning and attitudes about systems improvement. The authors conducted qualitative analysis iteratively with data collection to sufficiency.

RESULTS

Six emergent themes characterized faculty's approach to guiding students in systems improvement work: faculty-student relationship, faculty role, student role, faculty-student shared responsibility for projects, faculty and student content knowledge, and project outcomes. The faculty-student relationship was foundational for successful systems improvement work. Faculty roles included project selection, project management, and health systems interactions. Students engaged in systems improvement as their faculty leveraged their knowledge and skills and created meaningful student roles. Faculty and students shared responsibility and colearned systems improvement content knowledge. Faculty defined successful outcomes as students' learning about the systems improvement process and interprofessional collaboration.

CONCLUSIONS

Findings highlight the critical importance of pedagogical content knowledge to engage early learners in systems improvement work, understand their learning interests and needs, and manage their projects longitudinally.

Transition to Practice in Anesthesiology: Survey Results of Practicing Anesthesiologists on Their Experience

STUDY OBJECTIVE

To assess the experiences and attitudes of practicing anesthesiologists on practice/business management training received during residency and transitioning to practice through an online survey.

DESIGN

An online survey, consisting of 39 questions developed by the American Society of Anesthesiologists (ASA) Committee on Young Physicians, was emailed to 2 6551 practicing US anesthesiologists who were ASA members.

MEASUREMENTS

Questions about individuals' demographic information, transition to practice (TTP) experiences, medical business training, and TTP curricula in residency were included. Results were reported as descriptive statistics.

MAIN RESULTS

A total of 1199 responses were obtained (response rate 4.5%), and68% reported working in private practice over an average of 17 years. Those practicing ≤ 10 years were more likely to have a TTP curriculum in residency compared to those in practice ≥ 11 years. Common problems reported by many participants regarding TTP included: lack of effective mentorship, inadequate residency curricula/education, and an unfamiliarity with available resources.

CONCLUSIONS

Although medical business practice education is now required by training programs, there is room for improvement in education. One potential solution is establishing TTP curricula in residency programs, which emphasize the business aspects of medicine and practice management, thus easing trainees from a training to practice environment.

Improved analgesia and reduced post-operative nausea and vomiting after implementation of an enhanced recovery after surgery (ERAS) pathway for total mastectomy

Background

Enhanced Recovery After Surgery (ERAS) pathways have been shown in multiple surgical disciplines to improve outcomes, including reduced opioid consumption, length of stay, and post-operative nausea and vomiting (PONV). However, very few studies describe the application of ERAS to breast surgery and even fewer describe ERAS for outpatient surgery. We describe the implementation and efficacy of an Enhanced Recovery After Surgery (ERAS) pathway for total skin-sparing mastectomy with immediate reconstruction in an outpatient setting.

Methods

We implemented an evidence-based, multimodal ERAS pathway for all patients undergoing total skin-sparing mastectomy surgery with immediate reconstruction at a single 23-h stay surgery center. Highlights of the ERAS pathway included: preoperative acetaminophen, gabapentin, and scopolamine; regional anesthesia for the breast (Pectoral blocks type 1 and 2 or paravertebral block); and intraoperative dexamethasone and ondansetron. This retrospective study included all American Society of Anesthesiology (ASA) Class 1–3 patients undergoing total skin-sparing mastectomy surgery with immediate reconstruction between July 2013 and April 2016. We compared 96 patients who were in the ERAS pathway (ERAS group) to a retrospective cohort of 276 patients (Pre group). The primary outcome was total perioperative opioid consumption. Secondary outcomes were highest postoperative pain scores, incidence of PONV, and length of stay.

Results

Patients in the ERAS group had significantly lower total perioperative opioid consumption compared to the Pre group (mean (SD): 111.4 mg (46.0) vs. 163.8 mg (73.2) oral morphine equivalents, p < 0.001). Patients in the ERAS group also had a lower incidence of PONV (28% vs. 50%, p < 0.001). Patients in the ERAS group reported less pain in the recovery room, with a two-point decrease in highest pain score (median [interquartile range (IQR)]: 4 [2,6] in ERAS group vs. 6 [4,7] in Pre group, p < 0.001). There was no clinically significant difference in length of stay (median [IQR]: 1144 min [992, 1259] in ERAS group vs. 1188 [1058, 1344] in Pre group, p = 0.006).

Conclusion

Implementation of an ERAS pathway for total skin-sparing mastectomy with reconstruction that incorporates regional anesthesia is feasible in a 23-h-stay hospital. Patients in the ERAS pathway had improved post-operative analgesia and reduced post-operative nausea and vomiting.

Electronic supplementary material

The online version of this article (10.1186/s12871-018-0505-9) contains supplementary material, which is available to authorized users.

Combined preoperative femoral and sciatic nerve blockade improves analgesia after anterior cruciate ligament reconstruction: a randomized controlled clinical trial

STUDY OBJECTIVE

To compare preoperative femoral (FNB) with combined femoral and sciatic nerve block (CFSNB) in patients undergoing arthroscopic anterior cruciate ligament (ACL) reconstruction.

DESIGN

Prospective, randomized clinical trial.

SETTING

Ambulatory surgery center affiliated with an academic medical center.

PATIENTS

Sixty-eight American Society of Anesthesiology physical status I and II patients undergoing arthroscopic ACL reconstruction.

INTERVENTIONS

Subjects randomized to the CFSNB group received combined femoral and sciatic nerve blocks preoperatively, whereas patients randomized to the FNB group only received femoral nerve block preoperatively. Both groups then received a standardized general anesthetic with a propofol induction followed by sevoflurane or desflurane maintenance. Intraoperative pain was treated with fentanyl. Pain in the postanesthesia care unit (PACU) was treated with ketorolac and opiates. Patients with significant pain despite ketorolac and opiates could receive a rescue nerve block.

MEASUREMENTS

Our primary outcome variable was highest Numeric Rating Scale (NRS) pain score in PACU. NRS pain scores, opioid consumption, opioid adverse effects, and patient satisfaction were assessed perioperatively until postoperative day 3.

MAIN RESULTS

The highest PACU NRS pain score was significantly higher in the FNB group compared with the CFSNB group (7 [3-10] vs 5 [0-10], P=.002). The FNB group required significantly larger doses of opioids perioperatively (31.8 vs 19.8mg intravenous morphine equivalents, P<.001). PACU length of stay was significantly longer in the FNB group (128.2 vs 103.1minutes, P=.006). There was no significant difference in opioid consumption, pain scores, or patient satisfaction on postoperative days 1-3 between groups.

CONCLUSIONS

Preoperative CFSNB for arthroscopic ACL reconstruction improves analgesia, decreases opioid consumption perioperatively, and decreases PACU length of stay when compared with FNB alone.