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Edited by
Rebecca Leslie, Royal United Hospitals NHS Foundation Trust, Bath,Emily Johnson, Worcester Acute Hospitals NHS Trust, Worcester,Alex Goodwin, Royal United Hospitals NHS Foundation Trust, Bath,Samuel Nava, Severn Deanery, Bristol
In this chapter we discuss analgesic agents used in anaesthesia and peri-operative care. The main focus is upon opioid agents, different classes and preparations, their uses, effects and side-effects. We go on to explore non-steroid anti-inflammatory agents and paracetamol, with a section on paracetamol toxicity.
William Fawcett, Royal Surrey County Hospital, Guildford and University of Surrey,Olivia Dow, Guy's and St Thomas' NHS Foundation Trust, London,Judith Dinsmore, St George's Hospital, London
The safe administration of drugs is a key area in anaesthesia and intensive care. Ensuring patients receive the correct dose of the correct drug requires great care during the drawing up process (with any dilution required) and appropriate drug labelling. The anaesthetist must always remain vigilant for adverse drug reactions including anaphylaxis. Some of the drugs classes encountered maybe familiar to novices (such as opioids and some sedatives, antibiotics) but others will be less familiar (especially intravenous and volatile anaesthetic agents, both depolarising and non-depolarising neuromuscular blocking drugs, and nitrous oxide). Anaesthetists are often required to administer other drugs such as antibiotics, drugs affecting coagulation and drugs to assist imaging.
New areas are discussed, such as the transition away from nitrous oxide, desflurane and suxamethonium and the widespread use of sugammadex to reverse rocuronium, as well as the choice of total intravenous anaesthesia (TIVA) or volatile-based anaesthesia.
In the initial wave of the opioid crisis, uninformed prescribing practices and lax oversight were the drivers of opioid addiction and death. Although opioid prescriptions have decreased by 44.4 percent between 2011-2020,1 the number of deaths linked to prescription opioids has decreased only marginally.2 The marked fall in opioid prescribing without a concomitant reduction in opioid-related deaths suggests that an at-risk population continued to receive prescription opioids, whether directly or indirectly, from a medical professional. Currently, illicitly manufactured fentanyl (IMF) is the culprit for the majority of the approximately 81,000 annual opioid-related deaths.3 This finding has been misleadingly used to suggest that prescription opioids for chronic pain are no longer (and never were) a relevant concern,4 while the reality is that their lethal consequences are simply dwarfed by the marked rise in IMF deaths.5
Opioid use disorder is a cause of significant morbidity and mortality. In order to reverse opioid overdose as quickly as possible, many institutions and municipalities have encouraged people with no professional medical training to carry and administer naloxone. This study sought to provide preliminary data for research into the rates of adverse effects of naloxone when administered by bystanders compared to Emergency Medical Services (EMS) personnel, since this question has not been studied previously.
Methods:
This was a retrospective cohort study performed at an urban, tertiary, academic medical center that operates its own EMS service. A consecutive sample of patients presenting to EMS with opioid overdose requiring naloxone was separated into two groups based on whether naloxone was administered by bystanders or by EMS personnel. Each group was analyzed to determine the incidence of four pre-specified adverse events.
Results:
There was no significant difference in the rate of adverse events between the bystander (19%) and EMS (16%) groups (OR = 1.23; 95% CI, 0.63 - 2.32; P = .499) in this small sample. Based on these initial results, a study would need a sample size of 6,188 in order to reach this conclusion with 80% power. Similarly, there were no significant differences in the rates of any of the individual adverse events. Secondary analysis of patients’ demographics showed differences between the two groups which generate hypotheses for further investigation of disparities in naloxone administration.
Conclusions:
This preliminary study provides foundational data for further investigation of naloxone administration by bystanders. Adverse events after the prehospital administration of naloxone are rare, and future studies will require large sample sizes. These preliminary data did not demonstrate a statistically significant difference in adverse event rates when comparing naloxone administration by bystanders and EMS clinicians. This study provides data that will be useful for conducting further research on multiple facets of this topic.
Substance use disorders negatively affect global disease burden. Effective preventive interventions are available, but whether they provide value for money is unclear.
Aims
This review looks at the cost-effectiveness evidence of preventive interventions for cannabis use, opioid misuse and illicit drug use.
Method
Literature search was undertaken in Medline, CINAHL, PsycINFO, EconLit through EBSCOhost and EMBASE, up to May 2021. Grey literature search was conducted as supplement. Studies included were full economic evaluations or return-on-investment (ROI) analyses for preventing opioid misuse, cannabis and illicit drug use. English-language restriction was used. Outcomes extracted were incremental cost-effectiveness ratios (ICER) or ROI ratios, with costs presented in 2019 United States dollars. Quality was assessed with the Drummond checklist.
Results
Eleven full economic evaluation studies were identified from 5674 citations, with all studies conducted in high-income countries. Most aimed to prevent opioid misuse (n = 4), cannabis (n = 3) or illicit drug use (n = 5). Modelling was the predominant methodology (n = 7). Five evaluated school-based universal interventions targeting children and adolescents (aged <18 years). Five cost–benefit studies reported cost-savings. One cost-effectiveness and two cost–utility analysis studies supported the cost-effectiveness of interventions, as ICERs fell under prespecified value-for-money thresholds.
Conclusions
There are limited economic evaluations of preventive interventions for opioid misuse, cannabis and illicit drug use. Family-based intervention (ParentCorps), school-based interventions (Social and Emotional Training and Project ALERT) and a doctor's programme to assess patient risk of misusing narcotics (‘the Network System to Prevent Doctor-Shopping for Narcotics’) show promising cost-effectiveness and warrant consideration.
The Cut down, Annoyed, Guilty, and Eye opener- Adapted to Include Drugs (CAGE-AID) questionnaire (CA) is a validated screening tool used to assess risk for nonmedical opioid use (NMOU) in patients receiving opioids for cancer pain. Data on consistencies and variations in responses to the CA between different clinical settings are lacking. We evaluated the frequency and consistency in scoring of the CA among patients seen between the first inpatient consult (T1) and the first outpatient follow-up (T2) visits.
Methods
A retrospective chart review of 333 consecutive patients seen at both T1 and T2 within 3 months between August 2016 and March 2017 was reviewed.
Results
Median age was 58 years (range, 18–87 years); 53% were female. CA was completed for 88% of patients at T1 and 94% at T2. Of these, 10% and 13% were CAGE-AID positive, respectively. CA score changed from negative to positive in 4% and from positive to negative in 1% of patients between T1 and T2. Kappa coefficient for agreement of CA between T1 and T2 was 0.74 (95% CI: 0.62–0.86, p = 0.02).
Significant of results
Completion rate and consistency of patient responses to the CA were high irrespective of clinical setting. Of these patients, 10% and 13% were CA positive which is suggestive of high risk for NMOU. Further studies are needed to evaluate ways to ensure more consistency in the completion of the CA and enhance its utilization in routine clinical practice.
Despite increased efforts of government and non-government organisations to intervene via harm reduction and education initiatives, the opioid crisis has continued to worsen and has been exacerbated by the COVID-19 pandemic. In British Columbia, Canada, opioid overdose deaths in 2021 are the highest ever recorded. Neuromodulation procedures such as deep brain stimulation and repetitive transcranial magnetic stimulation have gained traction as treatments for opioid use disorder in various countries such as Germany, the Netherlands, the United States and China. However, these treatment options have been met with apprehension from both clinicians and patients, likely owing to fear, stigma and reluctance to label addiction as a brain disorder. Further complicating this landscape are socio-demographic factors, as marginalised communities are disproportionately burdened by addiction, while having poor access to care and a history of distrust in the health system. This multifactorial challenge involving many sociocultural factors requires culturally sensitive, interdisciplinary approaches to ensure direct-to-brain innovations are implemented ethically and equitably. This review summarises the state of the science for using neuromodulation to treat opioid use disorder, as well as the available ethical discourse surrounding the expansion of clinical trials and eventual widespread clinical implementation. Additional ethics discussions highlight opportunities for the engineering and clinical evolution of neuromodulation for opioid use disorder trials.
Body Dysmorphic Disorder (BDD) is a severe and common disorder that consists of distressing or impairing preoccupation with nonexistent or slight flaws in one’s physical appearance. People with BDD typically describe themselves as looking ugly, unattractive, deformed, or abnormal, whereas in reality they look normal or even very attractive.
Objectives
Case Study
Methods
Case Study
Results
Mr. X is a 31 year-old male with history of Opiate (heroin, oxycodone) use disorder currently on maintenance (Buprenorphine-Naloxone) treatment. On admission, urine toxicology was positive for opiates and other drugs.CIWA score was 11. He was started on Lorazepam taper, Mirtazapine, Fluoxetine, and was started on Suboxone soon after. His cravings decreased and he was admitted for Rehab. He reports that anxiety associated with his “body image” related to ears, shape of head, eyebrows since he was in high school which made him “feel uncomfortable” going to school and concentrating in his classes. His coping mechanism was covering his head with hats, shaving eyebrows, substance use, and receiving an otoplasty.
Conclusions
According to Houchins et al (2019), alcohol is the predominant substance used in BDD. It is interesting to note that only 6% of BDD patients had Opioid Use Disorder, but as this case demonstrates, can be a debilitating comorbidity that raises the risk for suicidality or hospitalization. However, little research has been done on the treatment of OUDs in patients with BDD or on the treatment of BDD in patients with an SUD, and this is an area of research that could benefit the modern population greatly.
The high prevalence of fentanyl in the illicit drug supply has generated concern among first responders regarding occupational exposure. Social media sharing of unconfirmed first responder overdoses after brief exposure to fentanyl may be contributing to an inappropriate risk perception of brief dermal fentanyl exposure. This case details a dermal exposure to a large dose of analytically confirmed pharmaceutical fentanyl (fentanyl citrate, 10 microgram fentanyl base per ml), over a large skin surface area. Additionally, the exposure occurred at a site with some skin barrier compromise, a factor that can increase fentanyl absorption. The patient underwent appropriate decontamination and underwent a brief medical assessment with no clinical effects of opioid exposure observed. This information is of value to first responders and other health care workers who are at risk of occupational fentanyl exposure. Findings are consistent with in vitro and ex vivo data supporting low risk of rapid absorption after brief dermal fentanyl exposure.
While the opioid epidemic engulfing the United States and the globe is well-documented, the potential use of powerful fentanyl derivatives as a weapon of terror is increasingly a concern. Carfentanyl, a powerful and deadly fentanyl derivative, is seeing a surge in popularity as an illegal street drug, and there is increasing congressional interest surrounding the classification of opioid derivatives under the Chemical Weapons Convention (CWC) given their potential to cause harm. The combination of the potency of opioid derivatives along with the ease of accessibility poses a potential risk of the use of these deadly agents as chemical weapons, particularly by terrorist organizations. Disaster Medicine specialists in recent years have established a sub-specialty in Counter-Terrorism Medicine (CTM) to address and research the unique terrorism-related issues relating to mitigation, preparedness, and response measures to asymmetric, multi-modality terrorist attacks.
Along with an increase in opioid deaths, there has been a desire to increase the accessibility of naloxone. However, in the absence of respiratory depression, naloxone is unlikely to be beneficial and may be deleterious if it precipitates withdrawal in individuals with central nervous system (CNS) depression due to non-opioid etiologies.
Objective:
The aim of this study was to evaluate how effective prehospital providers were in administering naloxone.
Methods:
This is a retrospective study of naloxone administration in two large urban Emergency Medical Service (EMS) systems. The proportion of patients who had a respiratory rate of at least 12 breaths per minute at the time of naloxone administration by prehospital providers was determined.
Results:
During the two-year study period, 2,580 patients who received naloxone by prehospital providers were identified. The median (interquartile range) respiratory rate prior to naloxone administration was 12 (6-16) breaths per minute. Using an a priori respiratory rate of under 12 breaths per minute to define respiratory depression, only 1,232 (47.8%; 95% CI, 50.3%-54.2%) subjects who received naloxone by prehospital providers had respiratory depression.
Conclusion:
This study showed that EMS providers in Los Angeles County, California (USA) frequently administered naloxone to individuals without respiratory depression.
Currently, Buprenorphine maintenance therapy (BMT) is an evidence-based treatment in retaining patients who are dependent on opioids. However, factors influencing retention are often measured objectively. Studies on patient’s perspectives on take home BMT in developing countries are limited.
Objectives
This study examines the potential factors influencing treatment compliance in the early phase of Buprenorphine maintenance treatment from the patient’s perspective
Methods
Participants (n=89) who were initiated on BMT were recruited and followed after six weeks. A semi-structured interview was conducted with 62 patients who remained in treatment and 24 patients who dropped out of the study
Results
Based on the semi qualitative analysis some of the factors which facilitated the patient’s retention in treatment were: (1) Effectiveness in blocking withdrawal symptoms (2) effectiveness in reducing their cravings and controlling their opioid use (3) decreased fear of withdrawal and/or missing doses(4) improvement in the quality of life(5) patient-related factors like family support (6) effectiveness of the treatment program. Around nine percent of patients reported family support as the reason for retention, which is not noticed in other studies. Barriers reported by the patients while on medication were: (1) negative effect experienced with medication (2) program related difficulties like distance, unavailability (3) major life event interrupting the treatment (4) patient-related factors like low mood, financial constraints.
Conclusions
Understanding factors associated with barriers to treatment provide insights into preventable factors that contribute to premature drop out from BMT and to improve clinical practice, policy decisions, or future research.
In the U.S. approximately11.4 million misused prescription pain relievers; 2.1 million had an OUD in 2017. The Addictions Nursing Subspecialty was created to address this epidemic by expanding a workforce trained in OUD/SUD screening, treatment, and prevention. A curriculum was developed that included integrated/telehealth health care settings in medical and mental health provider shortage areas during their last nine months of training. Courses were developed and taught by aninterprofessional team of university faculty and informed by evidence-based guidelines/clinical competencies for effective OUD/SUD screening/prevention, assessment, treatment, and recovery. Courses were also offered as electives for nursing, clinical-counseling, social work, and other health science disciplines emphasizing an interdisciplinary approach to healthcare.
Objectives
Expand the OUD/SUD trained workforce in areas with high OUD/SUD mortality rates and high mental health provider shortages emphasizing team-based integrated care and telehealth settings.
Methods
Program curriculum was informed by evidence-based guidelines/clinical competencies for effective OUD/SUD screening/prevention, assessment, treatment, and recovery using integrated care. Competencies included: Core Competencies for Integrated Behavioral Health and Primary Care that have been set forth by the Center for Integrated Health Solutions, telehealth competencies outlined in the recommended competencies by the National Organization of Nurse Practitioner Faculties (NONPF), and Core Competencies for Addictions Medicine by the American Board of Addictions Medicine.
Results
Approximately 11 students enrolled in courses received additions integrated/telehealth health care settings. Students responded positively to evaluations regarding timely feedback, unique approach (i.e. intrative content, short videos and discussions).
Conclusions
The Addictions Nursing subspecialty will continue to be offered allowing enrollment for nurses twice a year.
There is a paucity of knowledge and understanding of medical error in opioid substitution treatment programmes.
Objectives
To characterise patient safety incidents involving opioid-substitution treatment with methadone or buprenorphine in community-based care to identify the sources and nature of harm, describe and interpret themes and use this qualitative analysis to identify priorities to focus future improvement work.
Methods
We undertook a mixed-methods study examining incidents involving opioid substitution treatment with methadone or buprenorphine in community-based care submitted between 2005 and 2015 from the National Reporting and Learning System, a repository of incident reports from England and Wales. We analysed each report using four frameworks to identify incident type, contributory factors, incident outcome and severity of harm. Analysis involved detailed data coding and iterative generation of data summaries using descriptive statistical and thematic analysis.
Results
2,284 reports were identified. We found that most risks of harm came from failure in one of four processes of care delivery: prescribing opiate-substitution (n=151); supervised dispensing errors (n=248); non-supervised dispensing errors (n=318); and monitoring and communication activities (n=1544). Most incidents resulting in harm involved supervised or non-supervised dispensing (n=91/127, 72%). Staff- (e.g. mistakes, not following protocols) and organisation-related (e.g. poor working conditions or poor continuity of care between services) contributory factors were present for over half of incidents.
Conclusions
We have identified four processes of care delivery and associated contributory factors, which represent potential target areas for healthcare systems worldwide to develop interventions to improve the safe delivery of opioid substitution treatment.
The emergence of the COVID-19 pandemic has presented the addiction services with an unprecedented set of challenges. Opioid users are particularly vulnerable because of their high level of pre-existing health problems and lifestyle factors. In order to minimise their risks to self and to others in the current Covid-19 crisis, addiction services sought to urgently identify vulnerable individuals, and induct them into opioid substitution treatment (OST) promptly. Additionally, several guidelines were created and regularly updated by the health and safety executive (HSE) for any healthcare staff working with opioid users. These include guidance documents, to facilitate prompt induction of patients onto the OST programme, the prescribing of naloxone to all patients at risk of overdose, eConsultation, medication management for those in self-isolation, and the delivery of injecting equipment. The guidance documents and resources will provide a template for a new way of working for the sector during these challenging times and into the future.
A 31-year-old patient of post-surgical recurrent buccal carcinoma (post-chemo and radiotherapy) on multimodal analgesia with methadone, paracetamol and gabapentin presented to pain clinic with occasional bleeding from tumor area and incidental hypercalcemia. The hypercalcemia was attributed to adrenal insufficiency due to methadone, with no other obvious reasons identified for hypercalcemia or adrenal insufficiency. The patient was managed with the change of opioid, regular aseptic wound dressings and management of hypercalcemia with hydration, calcitonin and steroid therapy. Hypercalcemia in a cancer patient can have multiple other causes like hypercalcemia of malignancy and primary or secondary parathyroid carcinoma. A strong clinical suspicion and appropriate battery of tests may be required to arrive at the diagnosis. Prompt management, including identification and management of the primary pathology along with aggressive hydration with hormonal therapy, may prove to be life-saving.
There is no second chance to improve the quality of life of a dying patient. Getting it right allows a good death and leads to an uncomplicated bereavement for the family. However, there is much more to palliative care prescribing than just instituting a syringe driver: this chapter provides important information on opioid use (including how to calculate breakthrough doses and converting oral morphine to subcutaneous formulations), antiemetics and other commonly used drugs in palliative care.
Epidural analgesia is a safe and effective method of providing pain relief before, during and after a surgical procedure, or for patients with chronic pain, using a combination of local anaesthetic and opioids. The choice of agent, contraindications and complications of epidural analgesia are discussed, and the reader is also provided with top tips for prescribing epidurals.
Patient-controlled anagesia (PCA), used for the control of moderate to severe pain in the acute postoperative period, allows patients to self-administer boluses of intravenous or subcutaneous opioids. This chapter describes the advantages of this therapy, contraindications and provides top tips for PCA administration.
Poor analgesic control diminishes a patient’s quality of life and may slow down hospital recovery. The reader is introduced to the basic concepts of analgesia, including the WHO Pain Ladder, and some of the most commonly used analgesics, along with their indications, side effects and relative contraindications. Opioids are also described, and new prescribers are provided with conversion tables for the most commonly used preparations, including transdermal patches.