Medical simulation: Overview, and application to wound modelling and management
Identifieur interne : 001664 ( Pmc/Checkpoint ); précédent : 001663; suivant : 001665Medical simulation: Overview, and application to wound modelling and management
Auteurs : Dinker R. Pai [Malaisie] ; Simerjit Singh [Malaisie]Source :
- Indian Journal of Plastic Surgery : Official Publication of the Association of Plastic Surgeons of India [ 0970-0358 ] ; 2012.
Abstract
Simulation in medical education is progressing in leaps and bounds. The need for simulation in medical education and training is increasing because of a) overall increase in the number of medical students
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DOI: 10.4103/0970-0358.101280
PubMed: 23162218
PubMed Central: 3495369
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Pai</name><affiliation wicri:level="1"><nlm:aff id="aff1">Department of Surgery, Melaka Manipal Medical College, Jalan Batu Hampar, Bukit Baru, Melaka, Malaysia</nlm:aff><country xml:lang="fr">Malaisie</country><wicri:regionArea>Department of Surgery, Melaka Manipal Medical College, Jalan Batu Hampar, Bukit Baru, Melaka</wicri:regionArea><wicri:noRegion>Melaka</wicri:noRegion></affiliation></author><author><name sortKey="Singh, Simerjit" sort="Singh, Simerjit" uniqKey="Singh S" first="Simerjit" last="Singh">Simerjit Singh</name><affiliation wicri:level="1"><nlm:aff id="aff2">Department of Orthopaedics, Melaka Manipal Medical College, Jalan Batu Hampar, Bukit Baru, Melaka, Malaysia</nlm:aff><country xml:lang="fr">Malaisie</country><wicri:regionArea>Department of Orthopaedics, Melaka Manipal Medical College, Jalan Batu Hampar, Bukit Baru, Melaka</wicri:regionArea><wicri:noRegion>Melaka</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">23162218</idno><idno type="pmc">3495369</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3495369</idno><idno type="RBID">PMC:3495369</idno><idno type="doi">10.4103/0970-0358.101280</idno><date when="2012">2012</date><idno type="wicri:Area/Pmc/Corpus">002756</idno><idno type="wicri:Area/Pmc/Curation">002756</idno><idno type="wicri:Area/Pmc/Checkpoint">001664</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Medical simulation: Overview, and application to wound modelling and management</title><author><name sortKey="Pai, Dinker R" sort="Pai, Dinker R" uniqKey="Pai D" first="Dinker R." last="Pai">Dinker R. Pai</name><affiliation wicri:level="1"><nlm:aff id="aff1">Department of Surgery, Melaka Manipal Medical College, Jalan Batu Hampar, Bukit Baru, Melaka, Malaysia</nlm:aff><country xml:lang="fr">Malaisie</country><wicri:regionArea>Department of Surgery, Melaka Manipal Medical College, Jalan Batu Hampar, Bukit Baru, Melaka</wicri:regionArea><wicri:noRegion>Melaka</wicri:noRegion></affiliation></author><author><name sortKey="Singh, Simerjit" sort="Singh, Simerjit" uniqKey="Singh S" first="Simerjit" last="Singh">Simerjit Singh</name><affiliation wicri:level="1"><nlm:aff id="aff2">Department of Orthopaedics, Melaka Manipal Medical College, Jalan Batu Hampar, Bukit Baru, Melaka, Malaysia</nlm:aff><country xml:lang="fr">Malaisie</country><wicri:regionArea>Department of Orthopaedics, Melaka Manipal Medical College, Jalan Batu Hampar, Bukit Baru, Melaka</wicri:regionArea><wicri:noRegion>Melaka</wicri:noRegion></affiliation></author></analytic><series><title level="j">Indian Journal of Plastic Surgery : Official Publication of the Association of Plastic Surgeons of India</title><idno type="ISSN">0970-0358</idno><idno type="eISSN">1998-376X</idno><imprint><date when="2012">2012</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>Simulation in medical education is progressing in leaps and bounds. The need for simulation in medical education and training is increasing because of a) overall increase in the number of medical students <italic>vis-à-vis</italic> the availability of patients; b) increasing awareness among patients of their rights and consequent increase in litigations and c) tremendous improvement in simulation technology which makes simulation more and more realistic. Simulation in wound care can be divided into use of simulation in wound modelling (to test the effect of projectiles on the body) and simulation for training in wound management. Though this science is still in its infancy, more and more researchers are now devising both low-technology and high-technology (virtual reality) simulators in this field. It is believed that simulator training will eventually translate into better wound care in real patients, though this will be the subject of further research.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Banks, J" uniqKey="Banks J">J Banks</name></author><author><name sortKey="Carson, J" uniqKey="Carson J">J Carson</name></author><author><name sortKey="Nelson, B" uniqKey="Nelson B">B Nelson</name></author><author><name sortKey="Nicol, D" uniqKey="Nicol D">D Nicol</name></author></analytic></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct></biblStruct><biblStruct><analytic><author><name sortKey="Seevinck, J" uniqKey="Seevinck J">J Seevinck</name></author><author><name sortKey="Scerbo, Mw" uniqKey="Scerbo M">MW Scerbo</name></author><author><name sortKey="Belfore, La" uniqKey="Belfore L">LA Belfore</name></author><author><name sortKey="Weireter, Lj" uniqKey="Weireter L">LJ 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<front><journal-meta><journal-id journal-id-type="nlm-ta">Indian J Plast Surg</journal-id><journal-id journal-id-type="iso-abbrev">Indian J Plast Surg</journal-id><journal-id journal-id-type="publisher-id">IJPS</journal-id><journal-title-group><journal-title>Indian Journal of Plastic Surgery : Official Publication of the Association of Plastic Surgeons of India</journal-title></journal-title-group><issn pub-type="ppub">0970-0358</issn><issn pub-type="epub">1998-376X</issn><publisher><publisher-name>Medknow Publications & Media Pvt Ltd</publisher-name><publisher-loc>India</publisher-loc></publisher></journal-meta><article-meta><article-id pub-id-type="pmid">23162218</article-id><article-id pub-id-type="pmc">3495369</article-id><article-id pub-id-type="publisher-id">IJPS-45-209</article-id><article-id pub-id-type="doi">10.4103/0970-0358.101280</article-id><article-categories><subj-group subj-group-type="heading"><subject>Review Article</subject></subj-group></article-categories><title-group><article-title>Medical simulation: Overview, and application to wound modelling and management</article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Pai</surname><given-names>Dinker R.</given-names></name><xref ref-type="aff" rid="aff1"></xref><xref ref-type="corresp" rid="cor1"></xref></contrib><contrib contrib-type="author"><name><surname>Singh</surname><given-names>Simerjit</given-names></name><xref ref-type="aff" rid="aff2">1</xref></contrib></contrib-group><aff id="aff1">Department of Surgery, Melaka Manipal Medical College, Jalan Batu Hampar, Bukit Baru, Melaka, Malaysia</aff><aff id="aff2"><label>1</label>Department of Orthopaedics, Melaka Manipal Medical College, Jalan Batu Hampar, Bukit Baru, Melaka, Malaysia</aff><author-notes><corresp id="cor1"><bold>Address for correspondence:</bold> Dr. Dinker R. Pai, Department of Surgery, Melaka Manipal Medical College, Jalan Batu Hampar, Bukit Baru 75150, Melaka, Malaysia. E-mail: <email xlink:href="dinkerpai@gmail.com">dinkerpai@gmail.com</email></corresp></author-notes><pub-date pub-type="ppub"><season>May-Aug</season><year>2012</year></pub-date><volume>45</volume><issue>2</issue><fpage>209</fpage><lpage>214</lpage><permissions><copyright-statement>Copyright: © Indian Journal of Plastic Surgery</copyright-statement><copyright-year>2012</copyright-year><license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by-nc-sa/3.0"><license-p>This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.</license-p></license></permissions><abstract><p>Simulation in medical education is progressing in leaps and bounds. The need for simulation in medical education and training is increasing because of a) overall increase in the number of medical students <italic>vis-à-vis</italic> the availability of patients; b) increasing awareness among patients of their rights and consequent increase in litigations and c) tremendous improvement in simulation technology which makes simulation more and more realistic. Simulation in wound care can be divided into use of simulation in wound modelling (to test the effect of projectiles on the body) and simulation for training in wound management. Though this science is still in its infancy, more and more researchers are now devising both low-technology and high-technology (virtual reality) simulators in this field. It is believed that simulator training will eventually translate into better wound care in real patients, though this will be the subject of further research.</p></abstract><kwd-group><title>KEY WORDS</title><kwd>Simulation</kwd><kwd>wound management</kwd><kwd>wound modelling</kwd></kwd-group></article-meta></front><body><sec id="sec1-1"><title>INTRODUCTION</title><p><italic>Pari passu</italic> with the progress of science in medical education, simulation in medical education is also progressing in leaps and bounds. Something which was hardly ever talked about even a couple of years ago has now become the new buzz word in medical education circles, and now India is also getting on the bandwagon.</p><p>Simulation has been variably defined as “the imitation of the operation of a real-world process or system over time;”[<xref ref-type="bibr" rid="ref1">1</xref>] “an imitation of some real thing, state of affairs, or process” for the practice of skills, problem solving, and judgment.”[<xref ref-type="bibr" rid="ref2">2</xref>] The aim of medical simulation training is to imitate reality, or rather, to mimic reality to the closest extent possible so that the learner is in a state of “suspended disbelief” and he believes himself to be undergoing a real experience. Simulation has been used at its greatest effect in pilot training-indeed, it is mandatory for all pilots of commercial aircraft to undergo refresher courses on flight simulators, regardless of their real flying experience. Medical simulation has unfortunately not kept up with the development of simulation in engineering systems, flight training, etc. However, this situation is now rapidly changing.</p><p>This change has been brought about by three main reasons: firstly, a big increase in student population in medical education, both at the undergraduate and post-graduate level. Today, India has the highest number of medical colleges in the world. This unprecedented growth has occurred in the past two decades (MCI Vision 2015).[<xref ref-type="bibr" rid="ref3">3</xref>] Approximately 33,528 graduates pass out every year from these colleges (MCI Annual Report 2009–2010).[<xref ref-type="bibr" rid="ref4">4</xref>] This situation is mirrored in other countries as well. There has also been legislation which limits the number of hours residents can now work, reducing further the opportunity for bedside learning. The American Medical Association's Accreditation Council for Graduate Medical Education has limited the time that residents can be required to work to 80 h a week. Although this action was intended to improve patient safety, it also reduced the number of patient-contact hours needed to train residents. Many educators are turning to simulator-based training to meet that need.[<xref ref-type="bibr" rid="ref5">5</xref>]</p><p>Secondly, there is a growing awareness of patients of their rights and reluctance to be practiced upon and the growing incidence of medical litigation leading to a reduction in the number of available patients.[<xref ref-type="bibr" rid="ref6">6</xref>] It is common experience that litigation is also increasing in developing countries.</p><p>Finally, there has been a huge technological improvement in the quality and variety of simulators. Now, high fidelity computerised human patient simulators have been developed by various companies (e.g. SimMan by Laerdal, The METI family of human patient simulators by CAE Health Care), which mimic very realistically the response of human beings to physiological insults, whether it be an acute cardiac event, or a trauma event; indeed, any disease process that affects the cardiovascular or respiratory system can be accurately modelled. Surgical simulators have been developed to practice laparoscopic surgery using a virtual reality environment (e.g. the LapVR laparoscopic simulator by CAE Health Care), which even provide haptic feedback (a sense of tissue resistance). Other advanced simulators include ultrasound simulators, endoscopy simulators, etc. The list goes on and on.</p><p>With the increased focus worldwide on patient safety, many countries are now making certification on simulators mandatory before performing procedures on actual patients. Even in India, the MCI 2015 Vision document says that a mandatory and desirable comprehensive list of skills has been planned and would be recommended for Bachelor of Medicine and Bachelor of Surgery (MBBS) graduate. Certification of skills would be necessary before licensure. Clinical skills centres would need to be set up in all medical colleges.[<xref ref-type="bibr" rid="ref3">3</xref>] The Educational Technology Section of the 2004 AEM Consensus Conference for Informatics and Technology in Emergency Department Health Care concluded that there should be increasing use of web-based, virtual reality and human patient simulation in educating emergency medicine trainees. The authors postulate the philosophy of “see one, simulate many, do one competently, and teach everyone.”[<xref ref-type="bibr" rid="ref7">7</xref>]</p><p>There are now many articles on how simulation can be used in medical training. The traditional model of surgical apprenticeship hinges upon learning by doing. Learning is an opportunistic process, grafted onto clinical practice. A key challenge for surgical training is to provide conditions for effective learning without putting patients’ health at risk. Simulation presents an attractive solution, offering a safe, simulated clinical environment where the training agenda can be determined by the needs of the learner, not the patient. Repetitive practice and failures are permissible.[<xref ref-type="bibr" rid="ref8">8</xref>]</p><p>Evidence is now available to suggest that simulation training actually improves clinical performance. In a review of simulation articles, it was found that four (3%) journal articles provided evidence for the direct correlation of simulation validity with effective learning.[<xref ref-type="bibr" rid="ref9">9</xref>]</p><p>Another study showed that the use of Virtual Reality surgical simulation to reach specific target criteria significantly improved the operating room (OR) performance of residents during laparoscopic cholecystectomy.[<xref ref-type="bibr" rid="ref10">10</xref>]</p><p>Simulation in wound management is still relatively in its infancy when compared to the use of simulation in other areas of medical education. There are not many articles that deal with simulation in wound care. It is however reasonable to believe that the use of simulation in wound management will result in improvement in wound care. Simulation in relation to wounds can be divided into use of simulation to study the effect of projectiles on tissue (wound modelling) and the use of simulation in the management of wounds. The purpose of this article is to outline the present status of simulation related to wounds, in terms of their creation and management.</p></sec><sec id="sec1-2"><title>WOUND CREATION</title><p>Moulage is the art of creating mock injuries to simulate wounds. Theatrical makeup and common everyday materials are used to make very realistic moulage [<xref ref-type="fig" rid="F1">Figure 1</xref>]. Moulage is commonly used in mass casualty and disaster drills to add realism to the simulation. There are a number of resources which teach how to moulage different injuries.[<xref ref-type="bibr" rid="ref11">11</xref>] It is reasonable to believe, though not proven, that the use of moulage would create a more realistic environment to enhance learning in mass casualty and other trauma situations. As far back as in 1964, omissions and deficiencies in disaster ability were dramatically and conclusively revealed by use of what appeared to be a “live” disaster setting with smoke, fire, explosions; adverse weather and light conditions; realistically simulated “casualties” especially prepared not only to look but also to act the part.[<xref ref-type="bibr" rid="ref12">12</xref>]</p><fig id="F1" position="float"><label>Figure 1</label><caption><p>Moulage by author (DRP) showing bleeding thigh wound and evisceration on METIMan (CAE Health Care) mannequin</p></caption><graphic xlink:href="IJPS-45-209-g001"></graphic></fig></sec><sec id="sec1-3"><title>WOUND MODELLING</title><p>Another area where simulation is used in wounds is to simulate the effect of injuring agents on the body so as to understand the various forces that are at work on the tissues during the causation of an injury. This would help in accurate wound assessment and anticipation of likely tissue damage if the causative agent is known. Work has mainly been done on cavitating injuries produced by high-velocity projectiles. Because gelatin and glycerin soap have approximately the same density as human tissue, the gunshot effects in them are comparable with those in human tissue. The experiments with these substitutes make it possible to understand what happens to the human body as the result of, for example, a penetrating gunshot.[<xref ref-type="bibr" rid="ref13">13</xref>] Some other authors have used transparent gel candles [15% kraton (polymers) in 85% white paraffin oil] for the same purpose.[<xref ref-type="bibr" rid="ref14">14</xref>] A synthetic skin–skull–brain model has been developed to simulate gunshot wounds to the head in such a realistic manner as to reconstruct the specific physical characteristics of a given trauma, including its progressive formation. This model uses a silicon cap containing synthetic fibres for artificial skin, a layered polyurethane sphere for the skull (containing the outer and inner tables as well as the diploe), a periosteum of latex and the brain itself is simulated with ordnance gelatin. This model reacts realistically when struck by gunfire.[<xref ref-type="bibr" rid="ref13">13</xref>]</p></sec><sec id="sec1-4"><title>PHYSIOLOGICAL ASSOCIATIONS OF WOUNDS</title><p>High fidelity simulators are now available which can mimic the physiological effects of wounds on the body. The aim of management of a wounded individual in the Emergency Department is mainly to correct and prevent the life-threatening physiological derangements associated with the wound like airway obstruction, hypovolemia, respiratory distress, etc. As such, the management of the wound itself becomes secondary most of the time. These physiological derangements can be mimicked extremely realistically by these high fidelity systems, examples of which are the METI family of mannequins from CAE Health Care or the SimMan family from Laerdal. These simulators are used the world over to train emergency medical care providers, medical students, post-graduates and practicing physicians and surgeons in emergency trauma management [<xref ref-type="fig" rid="F2">Figure 2</xref>]. Military specific simulators (e.g. CAEsar from CAE HealthCare) are now in advanced stages of development to train soldiers with non-medical backgrounds at the “point of injury.”</p><fig id="F2" position="float"><label>Figure 2</label><caption><p>St. John's ambulance team (Malaysia) demonstration of trauma scenario on ECS (METI) simulator</p></caption><graphic xlink:href="IJPS-45-209-g002"></graphic></fig></sec><sec id="sec1-5"><title>WOUND MANAGEMENT</title><p>There are a few articles on the emergence of simulation in wound management, which deal essentially with teaching learners local wound management. This includes wound dressing techniques, performance of local surgery like escharotomy or wound debridement. Wound management simulators can be divided into basic part task trainers which use low-technology solutions that are cheap and high-technology virtual reality simulators which, of course, will be much more expensive. The low-technology solutions are discussed first, followed by the high-technology virtual reality solutions.</p><p>Simulated wounds have been created on animal models like pig trotters to teach the technique of wound debridement. A simulated wound covered with thick slough can be created on a pig trotter by excising an area of skin and then applying a layer of hydrocolloid paste (e.g. ADAPTTM, Hollister) on the denuded area. A layer of toothpaste may then be applied and covered with a piece of GLAD<sup>ô</sup> Wrap to simulate the application of EMLA cream. A small curette is then used to debride the wound as in a human patient, after washing away the layer of toothpaste (=topical anaesthetic). Similarly, one can create an eschar on a pig trotter skin. An area of skin is marked out and then coagulated with diathermy. This simulates eschar seen in human patients. Escharectomy is then performed.[<xref ref-type="bibr" rid="ref15">15</xref>]</p><p>Another study has created a simulated abscess in chicken breast by injecting mock purulent material under the chicken breast skin. The author felt that this new simulation model may be an effective tool to teach skin abscess management. Physicians who evaluated the simulated abscess found that it replicates the classic palpable fluctuance and ultrasound findings of an actual abscess, and it can be surgically incised and drained in a similar fashion.[<xref ref-type="bibr" rid="ref16">16</xref>]</p><p>Yet another researcher has used an orange to simulate debridement-the student is required to remove the peel and the white fibres (representing slough) off the orange without puncturing the inner orange itself.[<xref ref-type="bibr" rid="ref17">17</xref>]</p><p>Burn wounds offer a challenge to learners in terms of local wound care, and as a result are often mismanaged. To overcome this, realistic chest wall burn moulage has been developed which also permits escharotomy. This helps train burn care trainees in the management of such wounds, specifically to perform escharotomy. The mannequin also responds physiologically to the escharotomy by an improvement in respiratory excursions.[<xref ref-type="bibr" rid="ref18">18</xref>]</p><p>A major technological development has been that of a thigh wound virtual reality model by Delp <italic>et al</italic>. They have used the data from the Visible Human Project[<xref ref-type="bibr" rid="ref19">19</xref>] as the basis of reconstruction of the thigh anatomy, on which they superimposed wound models of bullet wounds gleaned from data available in the literature. Functional consequences of the injuries were also modelled, which provided both short-term consequences as well as long-term disability of the simulated patient. The user could interact with the virtual thigh model using virtual surgical instruments from a virtual tray to stop the bleeding, assess muscle bleeding and contractility, perform debridement, align bone, etc. The overall effect on the patient's physiology was also calculated and displayed in terms of vital signs readouts, which changed depending upon appropriate treatment, e.g. control of bleeding, etc. This system is being further refined to include force feedback.[<xref ref-type="bibr" rid="ref20">20</xref>]</p><p>The Virtual Reality Medical Center (VRMC) conceptualised and developed a unique injury simulator as an adjunct to current combat medic training. This initial technology, called Injury Creation Science (ICS), very realistically simulated a number of battlefield injuries such as amputations, eviscerations, blast injuries, punctures and burns. Since the initial prototypes, VRMC has developed this technology into wearable “part-task trainers” that simulate injuries as well as allow combat medics to practice actual medical procedures common to the battlefield. The procedures currently available or under development include treatment of pneumothorax, hemoperitonium and gunshot wounds to an artery. By integrating medical science with cutting-edge simulation and training technologies, realistic prosthetic tissue, wounds and part-task trainers have been developed for the training of trauma care clinicians.[<xref ref-type="bibr" rid="ref21">21</xref>]</p><p>One of the major issues with wounds is the risk of hospital-acquired wound infections, which are usually preventable by simple personal hygiene techniques. Unfortunately, many hospital workers are either unaware of them or unwilling to follow these steps. Training of all hospital staff to prevent cross infection is therefore high on the agenda for most hospital administrators, impinging as it does on patient safety. If the movement of bacteria that cause wound infection, and their removal from hands and other inanimate hospital objects could be seen, then it would be a very useful training tool and could markedly increase staff compliance with hygiene measures. This is exactly what was done in one study wherein ultraviolet polyethylene microspheres were able to simulate the spread of bacteria through direct and indirect contact on different surfaces and had the ability to be washed off under specific hand washing guidelines. The authors felt that due to the positive results, the use of microspheres as a simulator of bacterial presence and spread should be explored further in order to improve hand washing techniques and compliance.[<xref ref-type="bibr" rid="ref22">22</xref>]</p><p>A simulation-based training system for surgical wound debridement has been developed and comprises a multimedia introduction, a surgical simulator (tutorial component) and an assessment component. The multimedia training component describes varieties of wound categories (e.g. burns, lacerations, etc.), methods of debridement (e.g. sharp, mechanical, etc.) and equipment/materials used in the procedure. This module provides the pedagogical context for skills training and assessment, linking together all of the required elements for mastering the procedure. A software virtual agent is included and performs the role of an instructor by providing verbal guidance and assessment feedback. Designed to be comprehensive in order to reduce the need for a more senior instructor, the software addresses the patient's condition, initial description of the injury, and provides instruction on operation of the simulator. Specific instructions cover the removal of foreign objects with forceps, scrubbing with a brush, rinsing with saline solution and the maintenance of sterility. The simulator includes two PCs, a haptic device and mirrored display. Debridement is performed on a virtual leg model with a shallow laceration wound superimposed. Trainees are instructed to remove debris with forceps, scrub with a brush and rinse with saline solution to maintain sterility.[<xref ref-type="bibr" rid="ref5">5</xref>]</p><p>In conclusion, simulation has now come to stay in the field of medical education. Increasing sophistication in simulation technology has been also used in simulation of wounds, both in wound modelling and wound management. The available simulators include low-technology solutions and high-technology virtual reality simulators, all of which train learners in the art of wound management. However, this technology is yet to be validated in wound management to see if simulator training can result in better management of wounds in actual patients. 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