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Describe the hemodynamic implications of anaesthetic choice among children with heart disease undergoing cardiac catheterisation.
Methods:
Study 1 was a secondary analysis of data obtained during catheterisation-based hemodynamic assessment of infants with hypoplastic left heart syndrome following Stage 1 palliation, randomised in the Single Ventricle Reconstruction trial. Measured and calculated hemodynamics including pulmonary and systemic vascular resistance indexed to body surface area (PVRi and SVRi respectively) and pulmonary/systemic blood flow (Qp/Qs) were analysed with respect to anaesthetic employed during catheterisation, classified as moderate sedation or general anaesthesia. Study 2 consisted of a single centre, prospective analysis of patients requiring percutaneous closure of a patent ductus arteriosus or endomyocardial biopsy after orthotopic heart transplant. Participants underwent hemodynamic assessment first using inhaled volatile anaesthesia (IA), and then transitioned to total intravenous anaesthesia, comparing hemodynamic measures with respect to anaesthetic approach.
Results:
In Study 1, independent of shunt type, PVRi, and patient size, moderate sedation was associated with a greater than two-fold odds of a Qp/Qs >1 (OR 2.12, 95%CI 1.18–3.87, p = 0.013). In Study 2, while PVRi was similar, SVRi was significantly higher using total intravenous anaesthesia. Among the patent ductus arteriosus subgroup, Qp/Qs increased significantly with a total intravenous anaesthesia relative to IA (p = 0.003); additionally, among the orthotopic heart transplant subgroup, left ventricular end diastolic pressure increased following a transition to total intravenous anaesthesia (p = 0.002).
Conclusions:
Analyses of hemodynamics during catheterisation support a significant impact of anaesthetic type on hemodynamic values including SVRi, left ventricular end diastolic pressure, and Qp/Qs. Anaesthesia choice and intraprocedural management of SVRi are important considerations when making clinical decisions based on hemodynamic data.
Anaesthesia methods play a crucial role in ensuring the integrity of the animal during experimental studies. This study investigates the impact of two anaesthesia methods, CO₂ and cold treatment, on an insect antennal response to synthetic alarm pheromone compounds. Adult worker hornets were anesthetised, and their antennae excised and tested using an electroantennography set-up with controlled stimulation of alarm pheromone components. Results showed that CO₂-anesthetised hornets exhibited robust antennal responses, while cold-anesthetised individuals displayed none. This result suggests that freezing may impair the functionality of olfactory receptors. In contrast, CO₂ anaesthesia preserves receptor integrity, offering reliable and interpretable results. This study highlights the importance of selecting appropriate anaesthesia techniques to avoid artefacts in insect sensory physiology research and underscores the ecological relevance of studying Vespa velutina nigrithorax alarm signalling.
We describe caudal analgesia agent, dose, reported adverse events, and outcomes in a single-centre, retrospective cohort study of 200 patients undergoing cardiac surgery from October 2020 to April 2023. Median (interquartile range) doses of clonidine and morphine were 2.7 (2.1–3) mCg/kg and 0.12 (0.1–1.12) mg/kg, respectively. Our findings suggest that a clonidine/morphine caudal was tolerated in cardiac surgical patients.
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.
Widely popular amongst exam candidates, Dr Podcast Scripts is a great way to revise for your Primary FRCA. Providing questions and model answers spanning the breadth of the exam syllabus and fully updated in this second edition, this revision aid allows you to experience the format of questions likely to be asked and it provides tips on how to excel in the exam. Supplemented with helpful illustrations to explain answers, you will learn what to expect in the exam and how differently worded questions on the same topic require modified approaches. Written and updated by successful candidates providing insight and experience of the exam, all the material has been reviewed by experienced consultants with detailed knowledge of the educational standards. If you are preparing for your Primary FRCA exam, Dr Podcast Scripts for the Primary FRCA is a must!
The story is told through the experience of the patient, Paul, as well as through his partner and carer during that time, Sally. Their accounts feature next to each other, to provide a contrast for the different experiences of the patient and his wife. Following the decision to take early retirement from a high-powered job in business, Paul suffered a severe mental breakdown, which gradually led him into a world of fear, paranoia, catastrophic thinking and a desire to take his own life. For his own safety he was sectioned and spent four months in a psychiatric hospital. After various antidepressants and antipsychotics had no effect, Paul was persuaded to undergo ECT and, after only six sessions of treatment, had what his partner describes as ‘a complete and miraculous cure’. Four years after the event he is still fit and well and has had no relapses. This story explores the thoughts and feelings of someone who is suffering with acute anxiety/depression, as well as presenting the fears and desperation experienced by his partner.
Eustachian tube balloon dilatation performed for obstructive Eustachian tube dysfunction can lead to improvements in symptoms and a reduction in Eustachian Tube Dysfunction Questionnaire-7 scores. While historically performed under general anaesthetic, studies have demonstrated that Eustachian tube balloon dilatation can be performed under local anaesthetic with equivalent efficacy. We describe our local anaesthetic protocol used to perform Eustachian tube balloon dilatation in the out-patient setting and report outcomes from our case series.
Methods
Prospective analysis of all patients undergoing Eustachian tube balloon dilatation between October 2019 and July 2024.
Results
Thirty-one patients underwent 40 dilatations under local anaesthetic. All were well tolerated, with no adverse events. There was a statistically significant decrease in the average total Eustachian Tube Dilatation Questionnaire-7 score of -6.75 points (p = 0.0029) at short-term follow-up and of -7.58 points (p = 0.034) at long-term follow-up.
Conclusion
Our study provides further evidence that Eustachian tube balloon dilatation for obstructive Eustachian tube dysfunction can improve Eustachian Tube Dilatation Questionnaire-7 scores, and can be performed successfully under local anaesthetic in the out-patient setting.
Edited by
James Ip, Great Ormond Street Hospital for Children, London,Grant Stuart, Great Ormond Street Hospital for Children, London,Isabeau Walker, Great Ormond Street Hospital for Children, London,Ian James, Great Ormond Street Hospital for Children, London
Trauma is the leading cause of mortality and morbidity in children in developed countries. Traumatic brain injury is responsible for the largest proportion of deaths. Preventable death due to major haemorrhage occurs early in the first 24 hours. Mechanisms vary with age. Blunt injury represents over 80% of cases. Falls and road traffic collisions (RTCs) are the most common mechanisms across all ages, except for non-accidental injury (NAI) in < 1 year olds. There has been a substantial rise in penetrating trauma due to gun and knife crime in the adolescent population. The centralisation of trauma services in the United Kingdom with the creation of regional networks has changed how paediatric trauma is managed. Severely injured children are triaged at scene and taken directly to major trauma centres (MTCs). Outcomes have improved, and there is better standardisation between treating institutions. Initial trauma management involves stabilisation, resuscitation, identification and treatment of life-threatening injuries in the primary survey. Some patients will need damage control surgery to control haemorrhage. This is followed by definitive care and rehabilitation. Anaesthetists are an integral part of the trauma team involved throughout the patient journey. Dedicated anaesthetic roles are airway management and ongoing resuscitation during surgery.
Edited by
James Ip, Great Ormond Street Hospital for Children, London,Grant Stuart, Great Ormond Street Hospital for Children, London,Isabeau Walker, Great Ormond Street Hospital for Children, London,Ian James, Great Ormond Street Hospital for Children, London
Paediatric anaesthesia employs a range of equipment to ensure safe and effective achievement of anaesthetic goals. Variation in size and physiology in this age group has implications for clinicians using these technologies. Applied aspects and practical tips of this phenomenon are discussed in this chapter. Areas covered include equipment used to manage airway, vascular access, drug and fluid delivery, monitoring of various physiologic parameters, etc. While it is imperative to stay abreast with increasingly sophisticated drug delivery and monitoring systems, no monitor is a substitute for the presence and vigilance of the well-trained anaesthetist.
Edited by
James Ip, Great Ormond Street Hospital for Children, London,Grant Stuart, Great Ormond Street Hospital for Children, London,Isabeau Walker, Great Ormond Street Hospital for Children, London,Ian James, Great Ormond Street Hospital for Children, London
Children presenting for general paediatric surgery range in both age and complexity from neonates undergoing hernia repair to older children undergoing appendicectomy or excision of extensive neuroblastoma. In this chapter, we provide an overview of general surgery for infants and children beyond the neonatal period. We discuss the anaesthetic management of major and minor cases highlighting the variety of general and regional anaesthetic techniques available to anaesthetists. Children presenting for major surgery or multiple procedures or those with significant additional comorbidities warrant additional attention. Here, close communication with the surgeon and wider multidisciplinary team is necessary to establish risks, develop plans to mitigate risk and communicate risk to children and parents effectively.
Edited by
James Ip, Great Ormond Street Hospital for Children, London,Grant Stuart, Great Ormond Street Hospital for Children, London,Isabeau Walker, Great Ormond Street Hospital for Children, London,Ian James, Great Ormond Street Hospital for Children, London
Ophthalmic surgery takes place in children of all ages, from premature neonates to teenagers, the majority of whom are ASA 1 or 2. In some cases, the ocular pathology may be part of a wider congenital or metabolic abnormality and anaesthesia is not so straightforward. Nearly all will require general anaesthesia. Anxiety can be common in children returning for repeated procedures, and premedication may be necessary. Surgery can be extraocular or intraocular. Simple day-case procedures can usually be managed with an inhalational spontaneous breathing technique and supraglottic airway device (SAD). Certain more complex cases necessitate a completely still eye, and muscle relaxation is therefore usually required. Special anaesthetic considerations are management of the oculocardiac reflex (OCR), commonly elicited by traction on the recti muscles and prevention of postoperative nausea and vomiting (PONV); strabismus surgery is particularly emetogenic. The majority of ophthalmic surgery is not particularly painful, and simple analgesia with paracetamol and NSAIDs is sufficient. Regional ophthalmic blocks, such as sub-Tenons, can supplement or offer an alternative to opiates when additional analgesia is required. This has the added advantage of producing akinesis of the globe and a beneficial reduction in PONV and the OCR.
Edited by
James Ip, Great Ormond Street Hospital for Children, London,Grant Stuart, Great Ormond Street Hospital for Children, London,Isabeau Walker, Great Ormond Street Hospital for Children, London,Ian James, Great Ormond Street Hospital for Children, London
Cleft lip and palate is a relatively common congenital condition presenting for surgical correction. Anaesthetic management has some specific considerations involving airway surgery in infants and young children who may have other associated anomalies. Surgical care pathway and approaches are discussed as relevant to anaesthesiologists. Perioperative management, including preassessment of the child, optimisation prior to surgery, intraoperative and postoperative care, is presented. The importance of a multidisciplinary approach, good communication, shared airway management and adequate multimodal analgesia with the avoidance of respiratory depression are highlighted. Anaesthesia for secondary speech surgery is also presented.
Edited by
James Ip, Great Ormond Street Hospital for Children, London,Grant Stuart, Great Ormond Street Hospital for Children, London,Isabeau Walker, Great Ormond Street Hospital for Children, London,Ian James, Great Ormond Street Hospital for Children, London
This chapter covers principles of anaesthesia for children with congenital and inherited disease, with specific consideration of some conditions of particular relevance to paediatric anaesthetists, including the muscular dystrophies, malignant hyperthermia and the mucopolysaccharidoses.
Edited by
James Ip, Great Ormond Street Hospital for Children, London,Grant Stuart, Great Ormond Street Hospital for Children, London,Isabeau Walker, Great Ormond Street Hospital for Children, London,Ian James, Great Ormond Street Hospital for Children, London
The majority of children undergoing elective surgery can be discharged home on the same day. This has significant benefits for the child, improves productivity and reduces cost. A paediatric day-case service needs an infrastructure based on the guidelines set up by the Department of Health and professional bodies. The anaesthetist plays a vital role in this service and must be trained to use techniques that minimise perioperative pain and postoperative nausea and vomiting. There are clear published guidelines for the process of selecting appropriate patients and cases. In the past, performing tonsillectomies in children with obstructive sleep apnoea (OSA) as a day-case procedure was controversial. With improving surgical and anaesthetic techniques, most of these cases can now be done as day cases. A consensus statement was released in 2018 with recommendations of which patients should be excluded from this group. Good planning by the ward nurses, play therapists, theatre staff, surgeons and anaesthetists is essential to ensure the smooth running of a unit. Anaesthesia techniques require planning and attention to detail. A multimodal to approach to pain relief including local/regional anaesthesia is essential. Knowledge of risk factors and appropriate prevention of postoperative nausea and vomiting (PONV) is also vital. Regular patient satisfaction surveys and audit of quality and safety of care should be conducted using published standards.
Edited by
James Ip, Great Ormond Street Hospital for Children, London,Grant Stuart, Great Ormond Street Hospital for Children, London,Isabeau Walker, Great Ormond Street Hospital for Children, London,Ian James, Great Ormond Street Hospital for Children, London
Anaesthesia for paediatric urology may be for minor to major complex surgery. In this chapter, we discuss the anaesthetic management of a subspecialty that allows for a variety of general and regional anaesthetic techniques to be applied. Minor procedures include cystoscopy, resection of posterior urethral valves, circumcision, insertion of suprapubic (SP) lines, hypospadias repair and orchidopexy. We discuss techniques for major surgery, including pyeloplasty, ureteric re-implantation, nephrectomy, resection of Wilms tumour (nephroblastoma), bladder exstrophy and epispadias repair, bladder augmentation (ileocystoplasty) and formation of Mitrofanoff, as well as renal transplantation. Preoperatively, children undergoing cystoscopy and major urological and reconstructive surgery require a urine culture to guide antibiotic prophylaxis. Local ‘maximum surgical blood ordering schedules’ should be followed for guidance regarding cross-matching of blood for major procedures. Close communication with the surgeon and wider multidisciplinary team is necessary to identify the extent of surgery, positioning and appropriate vascular access for complex surgery and renal transplantation.
The vivisection debates are an undervalued nexus for nineteenth-century beliefs about pain. Close readings of the Report of the 1876 Royal Commission on Vivisection reveal how conceptualisations of animal physiology, anaesthetic action, reflex responses, and pithing undermined direct correspondences between injury, pain, and expressions of suffering. The chapter then examines representations of graphic registration and recording technologies in laboratory handbooks. These devices seemed to offer a new, universal, wordless language, yet frequently conjured precisely those images of inscription, symbolism, and transliteration that many scientists were anxious to avoid. The chapter then presents animalographies and antivivisection poetry ‘spoken’ by animals. By purporting to access a more complete and individual non-human consciousness, these texts presented themselves as rivals to mechanical laboratory devices. Nevertheless, despite efforts to ‘listen’ to animals, antivivisectionists and experimental scientists encountered the same vexatious problem: Language, like pain, seemed equally troubled by the distance between signifier and signified.
In anesthesiology and critical care medicine, specific arterial blood pressure targets should be attained, depending on the setting. For instance, a growing body of evidence indicates that perioperative blood pressure should not markedly deviate from its usual level. This underscores the importance of blood pressure measurement, ideally non-invasively, and has therefore spurred intense research efforts . Recent advances in non-invasive blood pressure monitoring are noteworthy. They involve not only innovative technologies such as the automatic finger cuff but also the widely used automatic upper arm cuff. The present chapter aims at providing a state of the art of non-invasive blood pressure monitoring in adult patients in acute care settings with emphasis on recent advances. This chapter addresses several key issues such as “are non-invasive measurements of blood pressure true and accurate?”, “can non-invasive monitoring detect changes in blood pressure? ” and “what if the patient is obese and / or has cardiac arrhythmia?”
Tamoxifen-induced CreER-LoxP recombination is often used to induce spatiotemporally controlled gene deletion in genetically modified mice. Prior work has shown that tamoxifen and tamoxifen-induced CreER activation can have off-target effects that should be controlled. However, it has not yet been reported whether tamoxifen administration, independently of CreER expression, interacts adversely with commonly used anaesthetic drugs such as medetomidine or its enantiomer dexmedetomidine in laboratory mice (Mus musculus). Here, we report a high incidence of urinary plug formation and morbidity in male mice on a mixed C57Bl6/J6 and 129/SvEv background when tamoxifen treatment was followed by ketamine-medetomidine anaesthesia. Medetomidine is therefore contra-indicated for male mice after tamoxifen treatment. As dexmedetomidine causes morbidity and mortality in male mice at higher rates than medetomidine even without tamoxifen treatment, our findings suggest that dexmedetomidine is not a suitable alternative for anaesthesia of male mice after tamoxifen treatment. We conclude that the choice of anaesthetic drug needs to be carefully evaluated in studies using male mice that have undergone tamoxifen treatment for inducing CreER-LoxP recombination.
This paper describes a two-part study of small predators in New Zealand forests. First, during 12 days of live-trapping, 31 wild ship rats were captured, tagged and released: 9 were handled while anaesthetised using halothane and 22 were handled while conscious using gloves. There was a significant difference between the two groups of ship rats in live-recapture rate: 4 out of 9 rats that had been handled while anaesthetised were recaptured alive, compared with 0 of 22 that were handled while conscious. Second, during 12 days of removal-trapping, 23 ship rats were killed, of which 6 were tagged, including 4 of the 9 that had been previously handled while anaesthetised (2 of which had also been recaptured alive during the live-trapping) and 2 that had previously been handled while conscious. These observations have implications for the statistical estimation of population density from capture-mark-recapture data and for the development of protocols for minimising stress in captured animals, especially nocturnal species released from traps in daylight.
The distress experienced by animals during the induction of unconsciousness remains one of the most important and yet overlooked aspects of effective methods of anaesthesia and euthanasia. Here we show that considerable differences exist in the aversive responses elicited by 12 common methods of inhalational anaesthesia and euthanasia in laboratory rats and mice. Carbon dioxide, either alone or in combination with oxygen or argon, was found to be highly aversive to both species. The least aversive agents were halothane in rats and enflurane in mice. Exposing these animals to carbon dioxide in any form, either for anaesthesia or for euthanasia, is likely to cause considerable pain and distress and is therefore unacceptable when efficient and more humane alternatives are readily available.