Racial and socioeconomic disparities in kyphoplasty among the Medicare population.

INTRODUCTION: Kyphoplasty is a minimally invasive treatment for chronic refractory pain secondary to spinal compression fracture. This study investigates racial and socioeconomic disparities in kyphoplasty among the Medicare population. MATERIALS AND METHODS: This study utilized data from the Medicare Limited Data Sets (LDS), a CMS administrative claims database. Patients aged 18 and older with ICD code consistent with spinal pathology and compression fractures were included. Outcome was defined as kyphoplasty by race and socioeconomic status (SES) with low SES defined by dual enrollment in Medicare/Medicaid. RESULTS: There was a total of 215,502 patients gathered from CMS data, and 717 (0.33%) of these patients underwent kyphoplasty during the study period. Of these patients, 458 (63.8%) were female, the average age was 76.5 years old, 655 (91.3%) were White, 20 (2.7%) were Black, 9 (1.3%) were Hispanic, and 98 (13.7%) were Medicare/Medicaid dual eligible. White patients (32,317/157,177 [20.6%]) were less likely to be dual enrollment eligible in Medicare and Medicaid than Black (5407/13,522 [39.9%]), Hispanic (2833/3675 [77.1%]), Asian (2087/3312 [63.0%]), or North American Native patients (778/1578 [49.1%]). Multivariate regression (MVR) analysis was performed and showed that Blacks were less likely than Whites to have a kyphoplasty performed (OR 0.46 [95% CI: 0.29-0.72], p-value <0.001). Although Hispanics (OR 0.95 [0.49-1.86]), North American Native (OR 0.82 [0.3-2.19]), and unknown race had a decreased odd of undergoing kyphoplasty, it was not statistically significant. CONCLUSION: Our study showed after adjustment for pertinent comorbidities, Medicare/Medicaid dual-eligible patients and Black patients were significantly less likely to receive kyphoplasty than White patients with Medicare.

Recent Advances in the Treatment of Opioid Use Disorder.

PURPOSE OF REVIEW: Opioid use disorder (OUD) remains a national epidemic with an immense consequence to the United States' healthcare system. Current therapeutic options are limited by adverse effects and limited efficacy. RECENT FINDINGS: Recent advances in therapeutic options for OUD have shown promise in the fight against this ongoing health crisis. Modifications to approved medication-assisted treatment (MAT) include office-based methadone maintenance, implantable and monthly injectable buprenorphine, and an extended-release injectable naltrexone. Therapies under investigation include various strategies such as heroin vaccines, gene-targeted therapy, and biased agonism at the G protein-coupled receptor (GPCR), but several pharmacologic, clinical, and practical barriers limit these treatments' market viability. This manuscript provides a comprehensive review of the current literature regarding recent innovations in OUD treatment.

Racial and Socioeconomic Disparities in Spinal Cord Stimulation Among the Medicare Population.

INTRODUCTION: Spinal cord stimulation (SCS) is used in the treatment of many chronic pain conditions. This study investigates racial and socioeconomic disparities in SCS among Medicare patients with chronic pain. MATERIALS AND METHODS: Patients over the age of 18 with a primary diagnosis of postlaminectomy syndrome (ICD-10 M96.1) or chronic pain syndrome (ICD-10 G89.4) were identified in the Center for Medicare and Medicaid Services (CMS) Medicare Claims Limited Data Set. We defined our outcome as SCS therapy by race and socioeconomic status. Multivariable logistic regression was used to determine the variables associated with SCS. RESULTS: We identified 1,244,927 patients treated between 2016 and 2019 with a primary diagnosis of postlaminectomy syndrome (PLS) or chronic pain syndrome (CPS). Of these patients, 59,182 (4.8%) received SCS. Multivariable logistic regression analysis revealed that, compared with White patients, Black (OR [95%CI], 0.62 [0.6-0.65], p < 0.001), Asian (0.66 [0.56-0.76], p < 0.001), Hispanic (0.86 [0.8-0.93], p < 0.001), and North American Native (0.62 [0.56-0.69], p < 0.001) patients were significantly less likely to receive SCS. In addition, patients who were dual-eligible for Medicare and Medicaid were significantly less likely to receive SCS than those eligible for Medicare only (OR = 0.38 [95% CI: 0.37-0.39], p < 0.001). CONCLUSIONS: This study suggests that racial and socioeconomic disparities exist in SCS among Medicare and Medicaid patients with PLS and CPS. Further work is required to elucidate the complex etiology underlying these findings.

Moderate and deep procedural sedation-the role of proper monitoring and safe techniques in clinical practice.

PURPOSE OF REVIEW: Interventional pain management procedures provide significant improvement to patient quality of life and functionality. In-office procedures are becoming an increasingly more common site of pain management intervention for patients with minimal risk of harm. RECENT FINDINGS: Moderate and deep sedation techniques can be used in patients with high anxiety, complex pharmacotherapy, or a low pain threshold. Proper guidance and oversight by an attending anesthesiologist, in addition to appropriate monitoring, are key. Epidural steroid injection complications rates have been cited at 2.4%, with the most common complications noted as persistent pain and flushing. SUMMARY: Serious complication errors can be avoided with proper supervision and monitoring. The adherence to published societal recommendations and guidelines for indications of when to use moderate to deep sedation techniques, and appropriate supervision and monitoring methods, can avoid errors in interventional pain management procedures.

A Comprehensive Review of the Celiac Plexus Block for the Management of Chronic Abdominal Pain.

PURPOSE OF REVIEW: Chronic abdominal pain (CAP) is a significant health problem that can dramatically affect quality of life and survival. Pancreatic cancer is recognized as one of the most painful malignancies with 70-80% suffering from substantial pain, often unresponsive to typical medical management. Celiac plexus neurolysis and celiac plexus block (CPB) can be performed to mitigate pain through direct destruction or blockade of visceral afferent nerves. The objective of this manuscript is to provide a comprehensive review of the CPB as it pertains to CAP with a focus on the associated anatomy, indications, techniques, neurolysis/blocking agents, and complications observed in patients who undergo CPB for the treatment of CAP. RECENT FINDINGS: The CAP is difficult to manage due to lack of precision in diagnosis and limited evidence from available treatments. CAP can arise from both benign and malignant causes. Treatment options include pharmacologic, interventional, and biopsychosocial treatments. Opioid therapy is typically utilized for the treatment of CAP; however, opioid therapy is associated with multiple complications. CPB has successfully been used to treat a variety of conditions resulting in CAP. The majority of the literature specifically related to CPB is surrounding chronic pain associated with pancreatic cancer. The literature shows emerging evidence in managing CAP with CPB, specifically in pancreatic cancer. This review provides multiple aspects of CAP and CPB, including anatomy, medical necessity, indications, technical considerations, available evidence, and finally complications related to the management.

Copper ions trigger disassembly of neurokinin B functional amyloid and inhibit de novo assembly.

The formation of amyloid is considered an intrinsic ability of most polypeptides. It is a structure adopted by many neuropeptides and neurohormones during the formation of dense core vesicles in secretory cells, yet the mechanisms mediating assembly and disassembly of these amyloids remain unclear. Neurokinin B is a neuropeptide thought to form an amyloid in secretory cells. It is known to coordinate copper, but the physiological significance of metal binding is not known. In this work we explored the amyloid formation of neurokinin B and the impact that metals had on the aggregation behaviour. We show that the production of neurokinin B amyloid is dependent on the phosphate concentration, the pH and the presence of a histidine at position 3 in the primary sequence. Copper(II) and nickel(II) coordination to the peptide, which requires the histidine imidazole group, completely inhibits amyloid formation, whereas zinc(II) slows, but does not inhibit fibrillogenesis. Furthermore, we show that copper(II) can rapidly disassemble preformed neurokinin B amyloid. This work identifies a role for copper in neurokinin B structure and reveals a mechanism for amyloid assembly and disassembly dependent on metal coordination.

CGRP Antagonists for the Treatment of Chronic Migraines: a Comprehensive Review.

PURPOSE OF REVIEW: The purpose of the following review is to summarize the most recent understanding of migraine pathophysiology, as well as of basic and clinical science pharmacologic literature regarding the development of calcitonin gene receptor peptide (CGRP) antagonists as a novel therapeutic modality for the treatment of migraine headaches. A review is provided of erenumab, the first of its class FDA approved CGRP antagonist. RECENT FINDINGS: Despite its high prevalence, the occurrence and treatment of migraine headaches is poorly understood. Erenumab and CGRP antagonists as a whole significantly reduce the average number of migraine days experienced in migraine sufferers. CGRP antagonists appear to significantly improve treatment outcomes in patients who suffer from episodic and chronic migraines. Erenumab is the first CGRP antagonist to be FDA approved for public use; however, further development of biologics in this class is underway.

Membrane Stabilizer Medications in the Treatment of Chronic Neuropathic Pain: a Comprehensive Review.

PURPOSE OF REVIEW: Neuropathic pain is often debilitating, severely limiting the daily lives of patients who are affected. Typically, neuropathic pain is difficult to manage and, as a result, leads to progression into a chronic condition that is, in many instances, refractory to medical management. RECENT FINDINGS: Gabapentinoids, belonging to the calcium channel blocking class of drugs, have shown good efficacy in the management of chronic pain and are thus commonly utilized as first-line therapy. Various sodium channel blocking drugs, belonging to the categories of anticonvulsants and local anesthetics, have demonstrated varying degrees of efficacy in the in the treatment of neurogenic pain. Though there is limited medical literature as to efficacy of any one drug, individualized multimodal therapy can provide significant analgesia to patients with chronic neuropathic pain.

A Comprehensive Review of Trigeminal Neuralgia.

PURPOSE OF REVIEW: Trigeminal neuralgia (TN) is characterized by recurrent attacks of lancinating facial pain in the dermatomal distribution of the trigeminal nerve. TN is rare, affecting 4 to 13 people per 100,000. RECENT FINDINGS: Although there remains a debate surrounding the pathogenesis of TN, neurovascular compromise is the most currently accepted theory. Minimal stimulation caused by light touch, talking, or chewing can lead to debilitating pain and incapacitation of the patient. Pain may occur sporadically, though is primarily unilateral in onset. The diagnosis is typically determined clinically. Treatment options include medications, surgery, and complementary approaches. Anti-epileptic and tricyclic antidepressant medications are first-line treatments. Surgical management of patients with TN may be indicated in those who have either failed medical treatment with at least three medications, suffer from intolerable side-effects, or have non-remitting symptoms. Surgical treatment is categorized as either destructive or non-destructive. Deep brain and motor cortex neuro-modulatory stimulation are off label emerging techniques which may offer relief to TN that is otherwise refractory to pharmacological management and surgery. Still, sufficient data has yet to be obtained and more studies are needed.

Regional Catheters for Outpatient Surgery-a Comprehensive Review.

PURPOSE OF REVIEW: This review summarizes and discusses the history of continuous catheter blockade (CCB), its current applications, clinical considerations, economic benefits, potential complications, patient education, and best practice techniques. RECENT FINDINGS: Regional catheters for outpatient surgery have greatly impacted acute post-operative pain management and recovery. Prior to development, options for acute pain management were limited to the use of opioid pain medications, NSAIDS, neuropathic agents, and the like as local anesthetic duration of action is limited to 4-8 h. Moreover, delivery of opioids post-operatively has been associated with respiratory and central nervous depression, development of opioid use disorder, and many other potential adverse effects. CCB allows for faster recovery time, decreased rates of opioid abuse, and better pain control in patients post-operatively. Outpatient surgical settings continue to focus on efficiency, quality, and safety, including strategies to prevent post-operative nausea, vomiting, and pain. Regional catheters are a valuable tool and help achieve all of the well-established endpoints of enhanced recovery after surgery (ERAS). CCB is growing in popularity with wide indications for a variety of surgeries, and has demonstrated improved patient satisfaction, outcomes, and reductions in many unwanted adverse effects in the outpatient setting.

Government Legislation in Response to the Opioid Epidemic.

PURPOSE OF REVIEW: Opioid misuse and abuse in the USA has evolved into an epidemic of tragic pain and suffering, resulting in the estimated death of over 64,000 people in 2016. Governmental regulation has escalated alongside growing awareness of the epidemic's severity, both on the state and federal levels. RECENT FINDINGS: This article reviews the timeline of government interventions from the late 1990s to today, including the declaration of the opioid crisis as a national public health emergency and the resultant changes in funding and policy across myriad agencies. Aspects of the cultural climate that fuel the epidemic, and foundational change that may promote sustained success against it, are detailed within as well. As a consequence of misuse and abuse of opioids, governmental regulation has attempted to safeguard society, and clinicians should appreciate changes and expectations of prescribers.

Low Back Pain, a Comprehensive Review: Pathophysiology, Diagnosis, and Treatment.

PURPOSE OF REVIEW: Low back pain encompasses three distinct sources: axial lumbosacral, radicular, and referred pain. Annually, the prevalence of low back pain in the general US adult population is 10-30%, and the lifetime prevalence of US adults is as high as 65-80%. RECENT FINDINGS: Patient history, physical exam, and diagnostic testing are important components to accurate diagnosis and identification of patient pathophysiology. Etiologies of low back pain include myofascial pain, facet joint pain, sacroiliac joint pain, discogenic pain, spinal stenosis, and failed back surgery. In chronic back pain patients, a multidisciplinary, logical approach to treatment is most effective and can include multimodal medical, psychological, physical, and interventional approaches. Low back pain is a difficult condition to effectively treat and continues to affect millions of Americans every year. In the current investigation, we present a comprehensive review of low back pain and discuss associated pathophysiology, diagnosis, and treatment.

Pain States, the Opioid Epidemic, and the Role of Radiologists.

PURPOSE OF REVIEW: The prevalence of chronic pain and prescription opioid abuse has resulted in epidemic problems for patients and clinicians. The consequences are taking a heavy toll on patients, physicians, and society. Specific to radiology, a significant need exists for best practice assessment and treatment approaches for pain management, as patients with chronic pain often undergo radiological tests of unclear clinical relevance. RECENT FINDINGS: The USA is amid an opioid-prescribing epidemic and resultant overdose public health emergency. A variety of reasons, which are examined in this manuscript, have contributed to the dramatic increase in the use of chronic opioid therapy for chronic non-cancer pain. This increase of opioid prescriptions and related deaths is based on many factors including the perception that there was systemic undertreatment of pain, the philosophical approach of advocacy groups for pain relief, promotion by the pharmaceutical industry, Joint Commission's Fifth Vital Sign, and permissive regulations by boards of medical licensures promoting excessive use of opioids. Overall, opioid treatment has been based on subjective pain relief and radiographic findings, which may not correlate with the source of pain generation. Radiologists, along with interventionalists, frequently interact with patients on chronic opioid therapy and at times take responsibility for patients with chronic pain. Beyond reading studies, diagnostic radiologists provide care to larger percentages of patients taking narcotics than ever before. This manuscript focuses on chronic pain, escalating opioid therapy, and adverse consequences, including the epidemic of overdoses and deaths. Radiologists' expertise can potentially reduce unnecessary radiological tests and inappropriate prescribing of medications.

Novel Interventional Nonopioid Therapies in Headache Management.

PURPOSE OF REVIEW: Headaches encompass a broad-based category of a symptom of pain in the region of the head or neck. For those patients who unfortunately do not obtain relief from conservative treatment, interventional techniques have been developed and are continuing to be refined in an attempt to treat this subset of patients with the goal of return of daily activities. This investigation reviews various categories of headaches, their pathophysiology, and types of interventional treatments currently available. RECENT FINDINGS: Injection of botulinum toxin has been shown to increase the number of headache free days for patients suffering from chronic tension-type headaches. Suboccipital steroid injection has been demonstrated as a successful treatment option for patients suffering from cluster headache. Occipital nerve stimulation (ONS) has been described as a treatment for all types of trigeminal autonomic cephalgias. Percutaneous ONS is a minimally invasive and reversible approach to manage occipital neuralgia performed utilizing subcutaneous electrodes placed superficial to the cervical muscular fascia in the suboccipital area. Radiofrequency lesioning is another commonly used treatment in the management of chronic pain syndromes of the head and neck. If a diagnostic sphenopalatine ganglion block successfully resolves the patient's symptoms, neurolysis can be employed as a more permanent solution. Although many patients who suffer from headaches can be treated with conservative, less-invasive treatments, there still remains at present an ever-increasing need for those patients who are refractory to conservative measures and thus require interventional treatments. These procedures are continually evolving to become safer, more precise, and more readily available for clinicians to provide to their patients.

Complex Regional Pain Syndrome, Current Concepts and Treatment Options.

PURPOSE OF REVIEW: Complex regional pain syndrome (CRPS) refers to a chronic pain condition that is characterized by progressively worsening spontaneous regional pain without dermatomal distribution. The symptomatology includes pain out of proportion in time and severity to the inciting event. The purpose of this review is to present the most current information concerning epidemiology, diagnosis, pathophysiology, and therapy for CRPS. RECENT FINDINGS: In recent years, discovery of pathophysiologic mechanisms of CRPS has led to significant strides in the understanding of the disease process. Continued elucidation of the underlying pathophysiological mechanisms will allow for the development of more targeted and effective evidence-based therapy protocols. Further large clinical trials are needed to investigate mechanisms and treatment of the disorder.

Spinal Cord Stimulation, MILD Procedure, and Regenerative Medicine, Novel Interventional Nonopioid Therapies in Chronic Pain.

PURPOSE OF REVIEW: Chronic pain is a highly prevalent condition affecting millions of individuals. RECENT FINDINGS: In recent years, newer treatments have emerged that are changing the way clinicians treat pain pathogenesis, including novel nonopioid strategies. In this regard, spinal cord stimulation, the MILD procedure, and regenerative medicine have shown promise. This review summarizes recent literature on these three emerging treatment strategies. The results of this review suggest that under certain conditions, spinal cord stimulation, the MILD procedure, and regenerative medicine can be effective treatment modalities.

Characteristics of Reported Adverse Events During Moderate Procedural Sedation: An Update.

BACKGROUND: Many interventional procedures are performed under moderate procedural sedation (MPS). It is important to understand the nature of and factors contributing to adverse events (AEs). Little data exist examining reportable AEs during MPS across specialties. A study was conducted to investigate adverse events during MPS and to compare associated patient and provider characteristics. METHODS: In a retrospective review, 83 MPS cases in which safety incidents were reported (out of approximately 20,000 annual cases during a 12-year period at a tertiary medical center) were analyzed. The type of AE and severity of harm were examined using bivariate and multivariate analyses to uncover associations between events with provider, procedure, and patient characteristics. RESULTS: The most common AEs were oversedation/apnea (60.2%), hypoxemia (42.2%), and aspiration (24.1%). The most common unplanned interventions were the use of reversal agents (55.4%) and prolonged bag-mask ventilation (25.3%). Cardiology, gastroenterology, and radiology were the specialties most frequently associated with AEs. Reversal agents, oversedation, and hypoxemia occurred most frequently in the gastroenterology and cardiology suites. Women were more likely to experience AEs than men, incurring higher rates of hypotension, prolonged bag-mask ventilation, and reversal agents. Increased body mass index was associated with lower rates of hypoxemia, while advanced age correlated with high rates of oversedation, harm done, and use of reversal agents. Malignancy and cardiovascular comorbidities were associated with increased AEs. Patients with respiratory comorbidities were less likely to be subject to AEs. CONCLUSION: Certain patient characteristics and types of procedures may be associated with increased risk of AEs during MPS.

Paravertebral Blocks for Same-Day Breast Surgery.

PURPOSE OF REVIEW: Breast surgery, performed for medical or cosmetic reasons, remains one of the most frequently performed procedures, with over 500,000 cases performed annually in the USA alone. Historically, general anesthesia (GA) has been widely accepted as the gold-standard technique, while epidural anesthesia was largely considered too invasive and thus unnecessary for breast surgery. Over the past years, paravertebral block (PVB) has emerged as an alternative analgesic or even anesthetic technique. Substantial evidence supports the use of PVB for major breast surgery. RECENT FINDINGS: In patients receiving PVB, immediate and long-term analgesia is superior to systemic analgesia while opioid use and typical adverse effects of systemic analgesia such as nausea and vomiting are decreased. The benefits may also include an improved oncological survival with PVB after mastectomy for malignancy. PVB offers clinically significant benefits for perioperative care of patients undergoing breast surgery. The benefits of continuous PVB are most firmly supported for major breast surgery and include both effective short-term pain control and reduction in burden of chronic pain. On the other hand, minor breast surgery should be effectively manageable using multimodal analgesia in the majority of patients, with PVB reserved as analgesic rescue or for patients at high risk of excessive perioperative pain.

Drug Formulation Advances in Extended-Release Medications for Pain Control.

Prescription opioid abusers frequently tamper with opioid tablets in order to either accelerate the delivery of the euphoria-inducing agent or to alter the route of delivery, such that it may be delivered intranasally or intravenously. As one strategy to combat the opioid epidemic in the USA, drug manufacturers have begun to explore formulations which resist such tampering by abusers. Techniques to prevent tampering consist of physical barriers to crushing, chewing, and drug extraction, or aversive or antagonistic agents, incorporated within the formulation itself. Recent years have seen the development of numerous extended-release opioid agents, which are described in this review. This article provides a comprehensive summary of the pharmacology, benefits, risks, and processes behind the development of currently available extended-release opioid drugs, as well as a glimpse into promising future formulations.

Pain in the Elderly.

Pain management in the elderly has increasingly become problematic in the USA as the aged population grows. The proportion of the population over 65 continues to climb and may eclipse 20 % in the next decade. In order to effectively diagnosis and treat these patients, a proper history and physical exam remain essential; pain assessment scales such as the Verbal Descriptor Scales (VDS), the Numerical Rating Scales (NRS), and the Visual Analogue Scales (VAS) often but not always prove beneficial. The conditions most frequently afflicting this population include osteoarthritis, diabetic neuropathy, post-herpetic neuralgia, and lower back pain which include spondylosis and radiculopathies. While the normal aging process does not necessarily guarantee symptoms of chronic pain, elderly individuals are far more likely to develop these painful conditions than their younger counterparts. There are many effective treatment modalities available as potential therapeutic interventions for elderly patients, including but not limited to analgesics such as NSAIDs and opioids, as well as multiple interventional pain techniques. This review will discuss chronic pain in the elderly population, including epidemiology, diagnostic tools, the multitude of co-morbidities, and common treatment modalities currently available to physicians.