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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
The final chapter in the book covers some specific electrical devices used in surgery, anaesthesia and critical care. Firstly, we discuss defibrillators where exam candidates are expected to have a good working knowledge and be able to both draw and explain the relevant electrical circuit. Secondly we discuss surgical equipment in LASER and diathermy, both of which carry detail in their different types, risks of harm and safety requirements. Finally the chapter discusses medical ultrasound, how it is generated and used in clinical practice.
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
Vascular access is a fundamental skill in anaesthesia and intensive care, not only for drug administration but also for delivery of fluids and blood products, and for sampling for blood tests. Peripheral venous access is used for all patients undergoing surgery, but for major surgery and/or very unwell patients, central venous access and arterial access may also be required.
Flow rates through cannulae are key in determining the size of cannula chosen, and are proportional to the fourth power of their internal radius. All vascular access must be inserted aseptically, and removed if signs of infection develop. Serious complications, particularly after central venous access are well described including pneumothorax, haemothorax and cardiac tamponade. The use of ultrasound for facilitating access is mandated for central access, but is also increasing for both more difficult arterial and peripheral venous access.
Transvaginal ultrasound scan is the mainstay of diagnosis of miscarriage. Evidence based criteria should be fulfilled in all cases, with interval scans as needed to avoid inadvertent interventions when the pregnancy may be viable. Incomplete, inevitable and complete miscarriages have specific ultrasound findings. Several ultrasound factors, including slow embryonic heart rate, small embryo or gestation sac size and an enlarged yolk sac, alone or in combination, help predict impending pregnancy loss. Uterine factors such as fibroids, adenomyosis and adhesions after previous caesarean birth may make ultrasound assessment for early pregnancy more challenging.
Miscarriage is the most common complication of pregnancy and is associated with significant emotional, social and economic impact. The diagnosis of miscarriage is made with transvaginal ultrasound examination following rigid diagnostic criteria which ensures a safe and accurate assessment for all women. This chapter outlines the evolution of national and international guidance on the ultrasound diagnosis of miscarriage highlighting when and why changes in practice have occurred. Diagnostic criteria are illustrated with ultrasound images and practical guidance is offered through inclusion of an annotated flowchart incorporating the most up to date evidence to protect women from the risk of inappropriate intervention. Once the diagnosis of miscarriage is made options for treatment include expectant, medical and surgical management. The chapter outlines fundamental information to discuss with women to facilitate informed decision making and provides guidance on the practical aspects of management of miscarriage.
Novel ultrasound neuromodulation techniques allow therapeutic brain stimulation with unmet precision and non-invasive targeting of deep brain areas. Transcranial pulse stimulation (TPS), a multifrequency sonication technique, is approved for the clinical treatment of Alzheimer’s disease (AD). Here, we present the largest real-world retrospective analysis of ultrasound neuromodulation therapy in dementia (AD, vascular, mixed) and mild cognitive impairment (MCI).
Methods
The consecutive sample involved 58 patients already receiving state-of-the-art treatment in an open-label, uncontrolled, retrospective study. TPS therapy typically comprises 10 sessions (range 8–12) with individualized MRI-based target areas defined according to brain pathology and individual pathophysiology. We compared the CERAD-Plus neuropsychological test battery results before and after treatment, with the CERAD Corrected Total Score ( CTS) as the primary outcome. Furthermore, we analyzed side effects reported by patients during the treatment period.
Results
CERAD Corrected Total Score (CTS) significantly improved (p = .017, d = .32) after treatment (Baseline: M = 56.56, SD = 18.56; Post-treatment: M = 58.65, SD = 19.44). The group of top-responders (top quartile) improved even by 9.8 points. Fewer than one-third of all patients reported any sensation during treatment. Fatigue and transient headaches were the most common, with no severe adverse events.
Conclusions
The findings implicate TPS as a novel and safe add-on therapy for patients with dementia or MCI with the potential to further improve current state-of-the-art treatment results. Despite the individual benefits, further randomized, sham-controlled, longitudinal clinical trials are needed to differentiate the effects of verum and placebo.
We present four cases of male genital schistosomiasis (MGS) within children and adolescents opportunistically encountered as part of a wider screening programme for imported schistosomiasis in Germany and community outreach screening in Mali. Such genital manifestations in young children and adolescents are often overlooked but can include hydrocele, hypogonadism, varicocele, cutaneous granulomata on the penis and scrotum, echogenic spots in the prostate and the epididymis, alongside testicular masses. Though these cases appear sporadic, from our scoping literature review, they draw fresh attention on MGS in young children and highlight wider confusion with other congenital, neoplastic and infectious disease. These might include an insufficient closure of the tunica vaginalis, malignancies or lymphatic filariasis. Frequently haematuria is not present. One typical sign indicating MGS in adults, i.e. haematospermia is not present before puberty. Another reason of missing MGS cases may be that screening with scrotal or transabdominal ultrasonography are not easily accepted unless the reason for it is not extensively explained beforehand and that transabdominal ultrasonography is less sensitive for revealing prostatic lesions than transrectal ultrasonography.
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.
Patients with thoracic trauma require rapid decision making and early intervention, especially during natural disasters when the influx of patients complicates hospitalization decisions. Identifying the characteristics of these patients can improve triage protocols, optimize resource allocation, and enhance outcomes in future disaster scenarios.
Study Objective:
The aim of this study was to determine the characteristics of hospitalized patients after the February 2023 earthquakes in Türkiye and to contribute to Disaster Medicine.
Methods:
This retrospective, cross-sectional study was conducted in a university hospital’s emergency department (ED) located in the earthquake area. All patients over 18 years old with earthquake-related thoracic trauma were included. Demographic information, mechanisms of injury, associated injuries, laboratory results, and treatments were recorded. Patients were divided into two groups: discharged and hospitalized.
Results:
The study included 179 patients, with a median age of 45 years. Overall, 80.4% were trapped under debris, and 43.8% were rescued on the first day. Hospitalization rates were higher in patients trapped under debris and those rescued after the first day. Blunt thoracic trauma was observed in 95.5% of patients. One hundred and three patients (57.5%) underwent Extended Focused Assessment with Sonography in Trauma (E-FAST) in the ED, 152 patients (84.9%) underwent x-ray, and 129 patients (72.1%) underwent computed tomography (CT). Imaging studies revealed rib fractures in 49.7% and lung parenchymal injuries in 48.6% of patients. Patients with lung parenchymal injury had higher hospitalizations rates. Hospitalized patients had higher levels of white blood cells (WBCs), potassium, blood urea nitrogen (BUN), creatinine, creatinine kinase (CK), creatine kinase-myocardial band (CKMB), and troponin I.
Conclusion:
This study highlights the prevalence of blunt thoracic trauma and the importance of imaging in the assessment of thoracic injuries following earthquakes. While few patients needed surgery, many required hospitalizations and had abnormal laboratory results, emphasizing the need for careful monitoring for complications like muscle damage and infection.
A previously healthy, very active 68-year-old man, who usually cycled over 100 km several times a week, noticed progressive tingling in his feet and lower legs that increased over several weeks. This was followed by progressive weakness in the arms and legs exceeding a period of eight weeks. After three months of progression, weakness became so severe that he could not even walk without help. He did not use drugs or drink alcohol.
We aimed to evaluate imaging modalities utilized in patients with vocal cord palsy (VCP) of unknown aetiology, emphasizing the significance of timing and diagnostic yield.
Methods
We conducted a retrospective review of medical records of patients diagnosed with VCP of unknown aetiology after their initial clinical examination between 2005 and 2016.
Results
In our cohort, 46 out of 173 (27 per cent) patients were diagnosed with malignancies. All malignancies were identified during the initial imaging examination, except for one patient. Diagnostic imaging facilitated the diagnosis in 36 per cent of the patients. Computed tomography (CT) of the neck and chest and full-body positron emission tomography-CT (PET-CT) presented the highest overall diagnostic yield of 36 per cent and 35 per cent, respectively.
Conclusion
We recommend that patients with initial CT of the neck and upper chest or PET-CT combined with magnetic resonance imaging without pathological findings, are followed without additional imaging examinations, unless new relevant symptoms arise.
Handheld ultrasound (US) devices have become increasingly popular since the early 2000s due to their portability and affordability compared to conventional devices. The Rapid Ultrasonography for Shock and Hypotension (RUSH) protocol, introduced in 2009, has shown promising accuracy rates when performed with handheld devices. However, there are limited data on the accuracy of such examinations performed in a moving ambulance. This study aimed to assess the feasibility and accuracy of the RUSH protocol performed by paramedics using handheld US devices in a moving ambulance.
Objectives:
The study aimed to examine the performability of the RUSH protocol with handheld US devices in a moving ambulance and to evaluate the accuracy of diagnostic views obtained within an appropriate time frame.
Methods:
A prospective study was conducted with paramedics who underwent theoretical and practical training in the RUSH protocol. The participants performed the protocol using a handheld US device in both stationary and moving ambulances. Various cardiac and abdominal views were obtained and evaluated for accuracy. The duration of the protocol performance was recorded for each participant.
Results:
Nine paramedics completed the study, with 18 performances each in both stationary and moving ambulance groups. The accuracy of diagnostic views obtained during the RUSH protocol did not significantly differ between the stationary and moving groups. However, the duration of protocol performance was significantly shorter in the moving group compared to the stationary group.
Conclusion:
Paramedics demonstrated the ability to perform the RUSH protocol effectively using handheld US devices in both stationary and moving ambulances following standard theoretical and practical training. The findings suggest that ambulance movement does not significantly affect the accuracy of diagnostic views obtained during the protocol. Further studies with larger sample sizes are warranted to validate these findings and explore the potential benefits of prehospital US in dynamic environments.
Ultrasound and center of gravity frequency data for the sequences /ʃ#s/ and /s#ʃ/ produced by Central Catalan speakers reveal that the former sequence is implemented through continuous articulatory and spectral trajectories which, depending on speaker, may be: intermediate between /ʃ/ and /s/ all throughout, thus supporting a dynamic blending mechanism; /ʃ/-like at onset and intermediate between the two fricatives at offset, which is indicative of C1-to-C2 carryover coarticulation. The sequence /s#ʃ/, on the other hand, undergoes regressive assimilation into [ʃ(ʃ)] according to the acoustic signal but less clearly so in the light of the articulatory data. This discrepancy appears to be due to the fact that, while C1=/s/ assimilates indeed to C2=/ʃ/ at constriction location, coarticulation-induced changes in tongue body configuration behind the primary articulator may occur as long as they do not jeopardize the front-cavity dependent frequency characteristics of the [ʃ] frication noise. Differences in articulatory complexity between /ʃ#s/ and /s#ʃ/ appear to result from the production mechanisms involved, i.e., tongue dorsum raising behind the /s/ constriction for /s#ʃ/ and tongue body repositioning for /ʃ#s/. In agreement with this interpretation, /ʃ#s/ but not /s#ʃ/ turned out to be longer than /s#s/ and /ʃ#ʃ/.
Our objectives were to quantify the dimensions of a fully ‘closed’ teat canal in dry cows and to describe recovery of the teat canal between milkings in lactating cows to assess whether and when full closure is attained, since this is an important determinant of udder health. Using an ultrasound scanner, teat canal length and diameter (proximal, midpoint and distal), teat cistern width, teat end width, whole teat width and teat wall thickness in 77 dry and 39 lactating dairy cows were measured. The dry cows represented a cross section of the dry population, with days since dry off ranging from 0 to 69 (median: 27). Data from lactating cows were recorded just before milking, and every 3 h post-milking. To control for location a cross-over (parlour vs. barn) study design was used. In dry cows, teat canal length and diameter did not vary by quarter or days since dry off, but multiparous cows had significantly wider teat canals than primiparous cows. The dry cow measurements can be used as baseline for dimensions for closed teats. In lactating cows, all teat dimensions except teat end width changed significantly during the 12-h milking cycle. Location (parlour vs. barn) did not affect the measurements, except teat end width and teat wall thickness. Teat canal length increased after milking and returned to pre-milking values by 9 h. Proximal and midpoint teat canal diameters decreased slightly just after milking and then progressively increased to above the pre-milking values by 9 h. Distal teat canal diameter increased after milking, partially contracting by 9 h. We found that during the dry period the teat canal is in a steady state, but its diameter is not zero, while during the lactation, the teat canal is in a near constant state of remodelling.
The ultrasound technique was applied to the synthesis of layered double hydroxides. The use of ultrasound in the synthesis of these compounds was studied in terms of its effect on their crystal qualities and surface properties. The crystal qualities of the compounds synthesized with ultrasound were compared with those of compounds synthesized without ultrasound to elucidate the effect of the ultrasound on the synthesis. The effect of crystal quality (crystallite size) on the adsorption behavior of humic substances was examined. The compounds synthesized under ultrasonic conditions showed a larger crystallite size and a larger adsorption capacity for humic substances than those synthesized without ultrasonic treatment. The degree of adsorption correlated well with crystal quality.
The effects of ultrasound treatment on the mean particle size, crystal structure, crystallite dimensions and specific surface area of natural muscovite and biotite samples have been investigated. Sonication of macroscopic flakes of muscovite and biotite produced a drastic particle-size reduction. The conditions for the preparation of micron and submicron-sized muscovite and biotite particles of narrow particle-size distribution by sonochemistry are described. The effect of sonication on particle-size reduction is more significant for muscovite than for biotite. Thus, for long sonication times (100 h), submicron and micron particles are predominant in muscovite and biotite, respectively. The resulting materials are crystalline, as assayed by X-ray diffraction, only broadening of the diffraction lines due to size-reduction was observed. Nuclear magnetic resonance studies revealed that the coordination of Al and Si was not modified by the treatment. Chemical analysis showed that the composition of the sample was not affected by the sonication except for a small contamination by Ti from the tip cup of the sonication instrument.
When a bilingual speaker has a larger linguistic sub-system in their L1 than their L2, how are L1 categories mapped to the smaller set of L2 categories? This article investigates this “subset scenario” (Escudero, 2005) through an analysis of laterals in highly proficient bilinguals (Scottish Gaelic L1, English L2). Gaelic has three lateral phonemes and English has one. We examine acoustics and articulation (using ultrasound tongue imaging) of lateral production in speakers’ two languages. Our results suggest that speakers do not copy a relevant Gaelic lateral into their English, instead maintaining language-specific strategies, with speakers also producing English laterals with positional allophony. These results show that speakers develop a separate production strategy for their L2. Our results advance models such as the L2LP which has mainly considered perception data, and also contribute articulatory data to this area of study.
The establishment of ultrasonography in daily gynaecological and obstetric practice has increased the rate of diagnosis of ovarian cysts amongst pregnant women. Both assessment and management of ovarian cysts in pregnancy can be challenging. Although most cysts are functional in nature and a conservative approach can be employed, a small proportion will carry some malignant potential. Identifying which cysts can be safely managed expectantly and which necessitate surgical intervention, investigating possible cyst accidents, deciding on the timing and nature of intervention (fine needle aspiration versus cystectomy or even oophorectomy), the surgical approach (laparotomy versus laparoscopy) and balancing the risks and benefits for the mother and the fetus are just a few examples of the dilemmas that need to be addressed, ideally within a multidisciplinary team-based environment.
Several studies have shown the additional benefit of point-of-care ultrasound (POCUS) by prehospital Emergency Medical Services (EMS). Since organization of EMS may vary significantly across countries, the value of POCUS likely depends on the prehospital system in which it is used. In order to be able to optimally implement POCUS and develop a tailored training curriculum, it is important to know how often POCUS is currently used, for which indications it is used, and how it affects decision making. The aims of this study were: (1) to determine the percentage of patients in whom POCUS was used by Dutch Helicopter Emergency Medical Services (HEMS) crews; (2) to determine how often POCUS findings led to changes in on-scene management; and (3) what these changes were.
Methods:
Patients who received prehospital care from December 1, 2020 through March 31, 2021 by a single HEMS crew were included in this prospective cohort study. Clinical data and specific data on POCUS examination, findings, and therapeutic consequences were collected and analyzed.
Results:
During the study period, on-scene HEMS care was provided to 612 patients, of which 211 (34.5%) patients underwent POCUS. Of these, 209 (34.2%) patients with a median age of 45 years were included. There were 131 (62.7%) trauma patients, and 70 (33.7%) of the included patients underwent cardiopulmonary resuscitation (CPR). The median reported time of POCUS examination was three (P25-P75 2-5) minutes. Median prolongation of on-scene time was zero (P25-P75 0-1) minutes. In 85 (40.7%) patients, POCUS examination had therapeutic consequence: POCUS was found to impact treatment decisions in 34 (26.0%) trauma patients and 51 (65.4%) non-trauma patients. In patients with cardiac arrest, POCUS was most often used to aid decision making with regard to terminating or continuing resuscitation (28 patients; 13.4%).
Conclusion:
During the study period, POCUS examination was used in 34.5% of all prehospital HEMS patients and had a therapeutic consequence in 40.7% of patients. In trauma patients, POCUS seems to be most effective for patient triage and evaluation of treatment effectiveness. Moreover, POCUS can be of significant value in patients undergoing CPR. A tailored HEMS POCUS training curriculum should include ultrasound techniques for trauma and cardiac arrest.