Academic literature on the topic 'Automatisk extern defibrillator'

Hjärtstopp sker oftast utanför sjukhus, långt ifrån avancerad sjukvård. För varje minut som går utan behandling minskar chansen att överleva avsevärt. Sju av tio personer som drabbats av hjärtstopp får hjärt-lungräddning innan ambulans är på plats. På grund av att fler ingripanden från åskådare sker innan ambulansen är på plats har tiden från hjärtstopp till start av hjärt-lungräddning minskat från 11 minuter till en minut. Syftet med studien är att belysa hur olika faktorer påverkar överlevnaden hos personer med hjärtstopp vid prehospital hjärt- och lungräddning. En litteraturöversikt valdes som metod. Sökningarna genomfördes i databaserna Cinahl ochPubMed och resulterade i 14 artiklar. Ytterligare fyra artiklar inkluderades manuellt. Artiklarna kvalitetsgranskades och klassificerades enligt Sophiahemmets högskolas bedömningsunderlag. Dataanalysen genomfördes med en integrerad analys. Resultatet påvisade att överlevnad efter hjärtstopp är starkt beroende av tiden. Tiden från kollaps till början av hjärt- lungräddning och tiden från kollaps till defibrillering är avgörande för överlevnadschansen. Kedjan som räddar liv (överlevnadsskedjan) representerar olika steg som skall följas vid ett hjärtstopp för att maximera chansen för optimal behandlingsstrategi vid ett hjärtstopp. Slutsatsen är att nya behandlingsstrategier behövs för att nå ut och behandla personer snabbare. AED gör det möjligt för lekmän att leverera livräddande chocker inom några minuter. Vidare gör utvecklingen av mobiltelefonteknik det möjligt att identifiera och rekrytera lekmän till närliggande hjärtstopp för livräddande åtgärder.
Cardiac arrest usually occurs outside hospitals, far from advanced healthcare. For every minute that goes without treatment, the chance of survival decreases significantly. seven out of 10 people who suffer from cardiac arrest receive cardiopulmonary resuscitation before an ambulance is on site. Due to the fact that more interventions from bystanders take place before the ambulance is in place, the time from cardiac arrest to start of cardiopulmonary resuscitation has been reduced from 11 minutes to one minute. The aim of the study is to shed light on how different factors affect the survival of people with cardiac arrest in prehospital cardiopulmonary resuscitation. A literature review was chosen as the method. The searches were performed in the Cinahl and PubMed databases and resulted in 14 articles. Another four articles were included manually. The quality of the articles were reviewed and classified according to Sophiahemmet University's assessment for quality. The data analysis was performed with an integrated analysis. The results showed that survival after cardiac arrest is strongly dependent on time. The time from collapse to the beginning of cardiopulmonary resuscitation and the time from collapse to defibrillation are crucial for the chance of survival. The chain that saves lives (the survivalchain) represents different steps that must be followed in a cardiac arrest in order to maximizethe chance of optimal treatment strategy in the event of a cardiac arrest. The conclusion is that new treatment strategies are needed to reach out and treat people faster. AED enables laymen to deliver life-saving shocks within minutes. Furthermore, the development of mobile phone technology makes it possible to identify and recruit lay peopleto nearby cardiac arrests for life-saving measures.

Abstract Background Todays guidelines for advanced CPR emphasize chest compressions with good quality and early defibrillation. Prehospital CPR performed by ambulance crew, an automated external defibrillator (AED) is used. The AED analyzes the heart rhythm and the performer is following the advice to chock the heart or not, given by the AED. During on-going CPR there are sequences when no chest compression is performed known as hands-off time. Hands-off time includes the time for the AED to analyze the heart rhythm and the time when advice is given to the crew. Studies show that prolonged hands-off time has a negative impact on survival after a sudden cardiac arrest. Purpose The purpose with this study was to look into if the hands-off time could decrease with use of manual mode on the defibrillator by the ambulance crew. The crew had to analyze, make a decision to chock or not, charge the defibrillator and give the chock if appropriate. Furthermore, the crews’ knowledge in analyzing heart rhythms that can be defibrillate was investigated.  Method A quasi-experimental method was used. 38 participants, all ambulance crew, were included in the study. The participants were randomized into two groups. One group performed CPR with an AED, the second group used the manual mode on the defibrillator. The study data were processed in SPSS. Results The time preceding the first defibrillation was significant shorter in the group using manual mode. There was no difference in total hands-off time between the two groups. All heart rhythms were interpreted right and all defibrillation were done correctly. Conclusions Time from establish cardiac arrest to first defibrillation was significant shorter in manual mode. Furthermore, all heart rhythms were interpreted right and all defibrillation were done correctly. Time from first defibrillation to start of chest compressions was equal in the two groups. There were no significant differences in hands-off time between the two groups.   Keyword: ambulance, cardiac arrest, automatic external defibrillator, manual defibrillator, manual rhythm analyze, hands-off time

L’arrêt cardiaque extra-hospitalier (ACEH) est un problème de santé publique majeur. La réanimation cardio-pulmonaire (RCP) précoce ainsi que la défibrillation par les témoins sont associées à une augmentation du taux de survie. Cependant, malgré d’importants efforts ces dernières années, les taux de survie restent faibles dans la plupart des pays. Ce travail avait pour objectif d’identifier des facteurs ayant un impact sur la défibrillation publique, la RCP précoce et les connaissances du public sur la défibrillation. Nous avons testé différentes stratégies de déploiement des défibrillateurs automatisés externes (DAE). Nous avons également analysé l’effet du niveau socio-économique des quartiers sur la RCP par les témoins. Enfin, nous avons cherché à évaluer les connaissances du public concernant la localisation et les conditions d’utilisation du DAE le plus proche dans des lieux publics très fréquentés. Tous les ACEH survenus à Paris entre 2000 et 2010 ont été enregistrés dans un registre et géocodés. Nous avons comparé une stratégie basée sur les recommandations de placement d’un DAE dans les lieux où plus d’un ACEH survenait tous les cinq ans à deux nouvelles stratégies : une stratégie de maillage régulier du territoire avec des DAE placés à distances régulières et une stratégie de placement dans différents types de lieux publics. Le nombre de DAE nécessaires ainsi que la distance médiane entre les ACEH et le DAE le plus proche étaient calculés pour chaque stratégie. Nous avons également recherché l’association entre le niveau socio-économique des quartiers sur le fait de bénéficier d’une RCP. Enfin, nous avons réalisé une enquête dans des lieux publics très fréquentés (gare, centres commerciaux, jardin public) auprès de toutes les personnes situées dans un rayon de 100 mètres autour d’un DAE pour analyser leur connaissance de la localisation du DAE et leur capacité à l’utiliser. Parmi 4176 ACEH, 1372 (33%) sont survenus dans des lieux publics. La stratégie basée sur les recommandations aurait conduit au placement de 170 DAE avec une distance aux ACEH de 416 (180-614) mètres et une augmentation continue du nombre de DAE. Avec la stratégie de maillage régulier du territoire, le nombre de DAE et la distance aux ACEH auraient changé selon la taille du maillage avec un nombre optimal de DAE évalué entre 200 et 400. Avec la stratégie de placement dans différents types de lieux publics, la distance médiane entre les ACEH et les DAE aurait été de 324 mètres pour les bureaux de poste (195), 239 mètres pour les stations de métro (302), 137 mètres pour les stations Velib’ (957) et 142 mètres pour les pharmacies (1466). Parmi les 4009 ACEH géocodables enregistrés, 777 (19,4%) ont bénéficié d’une RCP par un témoin. Ceux qui en ont bénéficié étaient plus fréquemment dans un lieu public, en présence d’un témoin et dans un quartier de statut socio-économique (SSE) non défavorisé. Dans une analyse multiniveaux la RCP par les témoins était significativement moins fréquente dans les quartiers de SSE défavorisé que dans les quartiers d’autres SSE (OR 0,85 ; 95% IC 0,72-0,99). Notre enquête a été menée auprès de 301 participants. Environ la moitié des participants (49%) avaient bénéficié d’une formation aux premiers secours, dont 70% après 2007 et 37% qui avaient suivi une initiation d’une heure. Le logo universel des DAE était reconnu par 37% des participants et 64% pouvaient reconnaître un DAE en photo. La localisation du DAE le plus proche était connue par 16% des participants avec un impact positif des formations après 2007 et de la reconnaissance du logo ou des photos (p<0,0001). Une majorité de participants (66%) savaient qu’ils avaient le droit d’utiliser un DAE et 59% savaient dans quelles circonstances l’utiliser. Seulement 25% des participants déclaraient savoir comment utiliser un DAE. Notre travail présente une approche originale pour optimiser les stratégies de déploiement des DAE. (...)
Out-of-hospital cardiac arrest (OHCA) is a major public health concern. Early bystander cardiopulmonary resuscitation (CPR) and defibrillation are associated with higher survival rates for OHCA victims. Unfortunately, despite major efforts over the past decade, survival rates remain low in many communities. This work sought to highlight factors affecting public defibrillation, early CPR and public knowledge on defibrillation. We assessed different strategies for Automated External Defibrillators (AEDs) deployment. We also aimed to focus effect of neighborhood socio-economic status on bystander CPR. Finally, we sought to analyze public awareness of the AED nearest location and knowledge of AED use. All OHCAs attended by EMS in Paris between 2000 and 2010 were prospectively recorded and geocoded. We compared a guidelines-based strategy of placing an AED in locations where more than one OHCA had occurred within the past five years to two novel strategies: a grid-based strategy with a regular distance between AEDs and a landmark-based strategy. The expected number of AEDs necessary and their median (IQR) distance to the nearest OHCA were assessed for each strategy. We also evaluated the relationship between neighbourhood SES characteristics and the fact of receiving bystander CPR. Then, we performed a survey in three kinds of places (train station, city mall and public park) of all individuals within 100 meters from an AED to analyze their knowledge of the closest AED location and their confidence to use it. Of 4,176 OHCAs, 1,372 (33%) occurred in public settings. The guidelines-based strategy would result in the placement of 170 AEDs, with a distance to OHCA of 416 (180-614) meters and a continuous increase in the number of AEDS. In grid-based strategy, the number of AEDs and their distance to the closest OHCA would change with the grid size, with a number of AEDs between 200 and 400 seeming optimal. In landmark-based strategy, median distances between OHCAs and AEDs would be 324 meters if placed at post offices (n=195), 239 at subway stations (n=302), 137 at bike-sharing stations (n=957), and 142 at pharmacies (n=1466). Of the 4,009 OHCA with mappable addresses recorded, 777 (19.4%) received bystander CPR. Those receiving it were more likely to be in public locations, have had a witness to their OHCA, and to have collapsed in a non-low SES neighbourhood. In a multilevel analyses, bystander CPR provision was significantly less frequent in low than in higher SES neighbourhoods (OR 0.85; 95% confidence interval [CI] 0.72-0.99). A total of 301 people responded to the survey. About half respondents (49%) had a Basic Life Support training experience with 70 % of them trained after 2007 and 37% who attempted a one hour training initiation. The universal AED sign was recognized by 37% of all respondents and 64% could recognize an AED on a picture. The closest AED location was known by 16% of the respondents with a positive impact of training after 2007 and knowledge of AED sign and picture (p<0.0001). A majority of respondents (66%), considered they had the right to use an AED and 59% knew in which circumstances it is necessary to use it. Only 25% of the respondents declared to know how to use an AED. Our work presents an original evidence-based approach to strategies of AED deployment to optimize their number and location. This rational approach can estimate the optimal number of AEDs for any city. In Paris, OHCA victims were less likely to receive bystander CPR in low SES neighbourhoods. These first European data are consistent with observations in North America and Asia. Our survey conducted in places known to be at risk of OHCA highlights the need for a better AED visibility in public places and the need to improve public knowledge and confidence in the use of AED. (...)

This thesis draws upon data gathered during research undertaken with a grant from the Resuscitation Council (UK). It explores the use of Automatic External Defibrillators (AEDs) by laypeople, which is known as Public Access Defibrillation (PAD). Whilst an abundance of research has been undertaken about this phenomenon, it has predominately been conducted using quantitative methods; however the data I am using was collected using a qualitative approach. During the research, fifty-three semi-structured interviews were carried out. Most of these were with laypeople who had been trained to use AEDs, and nine involved those who delivered the training. These interviews were conducted at sites typical of those where these devices have been introduced, such as railway stations and airports. The geographical area of these locations covered the East and West Midlands, South and West Yorkshire, Lincolnshire and Essex. The aims of the research were quite broad and included exploring how to make training more realistic, how debriefing and support for those who had used an AED should be organised and how the interviewees perceived the technology inherent in the AED. This thesis reanalyses the data that was collected during that research and focuses on two themes. Firstly, some of the theories of technologies in transition are used to illustrate how AEDs were developed in a laboratory and progressed from that setting to become commonplace in public locations. The actor-network theory is adopted to argue that these technological devices exert an influence on the human actors in the networks that exist within society. Specifically, my analysis is informed by the work of Timmermans (1998; 1999; 1997) whose theories about external chest compressions I have developed and applied to AEDs. They suggest that these devices achieved universality, in part, through the influence of debates and medical protocols. One significant factor was that AEDs allowed for defibrillation to be redefined from a medical, to a first aid procedure. Eventually, using these devices was included in the protocols for first aid and this legitimised their use by laypeople. These theories are observable in the data through the interviewees’ accounts of how they came to accept being trained to use AEDs. The experiences of those who had used an AED during a resuscitation attempt are provided and suggest that these are distressing and unpleasant events. Consequently, a key component of this thesis is a discussion of the necessity to provide psychological debriefing for those who have been involved in these incidents. The findings of this thesis suggest that laypeople who have used an AED usually have questions about the actions they took during the attempted resuscitation and need to address these with someone soon afterwards. Generally, they prefer to discuss these issues with a person who has experience of resuscitation and using a defibrillator. However, the provision of such support is often not well organised and individuals are sometimes not aware of what is available to them. I conclude by suggesting that it is important that those who are asked to use an AED have a clearly identifiable person to contact should they need to discuss any issues which may arise. I argue that the responsibility for ensuring that such mechanisms are in place lies with those who instigate the schemes which place AEDs in these locations. Public access defibrillation is a relatively new concept in the UK and I believe that this thesis makes an important contribution to the body of knowledge relating to this phenomenon.

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Cardiac arrest is one of the most common causes of death in the world. Among the people who can be saved from this condition, most are in Ventricular Fibrillation or Pulseless Ventricular Tachycardia. Electrical defibrillation is the simplest and most important therapy in the treatment of these patients. The Automatic External Defibrillator is the device that can be used by laypersons with a minimum of training to perform defibrillation, reducing the waiting time of the first pulse application, which directly influenciate the success rate of this therapy. This work describes a way of using the Extended Kalman Filter (FKE) to correct ECG signals used by an Automatic External Defibrillator in the decision making of the defibrillatory pulse application in patients, as well as a proposed Defibrillator model describing the aspects of its operation.
A parada cardíaca é uma das causas mais comuns de morte no mundo. Dentre as pessoas que podem ser salvas dessa condição, a maioria encontra-se em Fibrilação Ventricular ou Taquicardia Ventricular sem pulso. A Desfibrilação Elétrica é a terapia mais simples e importante no tratamento desses pacientes. O Desfibrilador Externo Automático é o aparelho que pode ser utilizado por leigos com um mínimo de treinamento para efetuar a Desfibrilação, diminuindo o tempo de espera da aplicação do primeiro pulso, o que influencia diretamente na taxa de sucesso dessa terapia. Neste trabalho descreve-se uma forma de utilização do Filtro de Kalman Estendido (FKE) para corrigir sinais de ECG utilizados por um Desfibrilador Externo Automático na tomada de decisão da aplicação do pulso desfibrilatório em pacientes, bem como uma proposta modelo de Desfibrilador que descreve os aspectos principais do seu funcionamento.

Objective: The prevalence of paediatric cardiac arrhythmias is increasing, and management of some high-risk arrhythmias now involves giving the family an automatic external defibrillator (AED) to use in the case of their child experiencing sudden cardiac arrest. No earlier research has explored caregivers’ experiences of caring for a child with cardiac arrhythmia who has an AED. This qualitative study aimed to explore the experiences of caregivers caring for a child with cardiac arrhythmia who has an AED. Methods: In-depth semi-structured interviews were conducted with seven caregivers (two couples) across five interviews. Interpretative Phenomenological Analysis was used to analyse the data. Results: Four super-ordinate themes were identified and, due to word limit restrictions, three have been reported on here: the impact of cardiac arrhythmia on daily life, experiences of living with the AED, and experiences of hospital support. Conclusions: A greater understanding of caregivers’ experiences in this context will be used to inform services about how they can best support and meet the needs of children with cardiac arrhythmia who have an AED, and their families.

碩士
中原大學
生物醫學工程研究所
101
An automatic external defibrillator is a portable first-aid medical device. It delivers a large current through the chest to shock the heart to terminate heart fibrillation. This defibrillation treatment has been proved to be effective in saving patient from sudden cardiac arrest. Therefore, public access defibrillator programs are promoted in many countries to widely place defibrillators at different public places. Public access defibrillators are generally in standby state, but they should be always ready to work in case of emergency. However, there are many defibrillators have been recalled for possible malfunctions that might be caused by defective parts. In this study, an embedded self-test system of defibrillator is developed for routinely testing its major components to save maintenance cost and to make sure the defibrillator is free from failure. The self-test items of defibrillator includes: battery voltage, speech synthesis circuit, sound recording circuit, event recording, electrode pads, ECG circuit, charging and discharging circuit. Each part has its own specificity and requires special design of its testing procedure. If any item fails its test, the defibrillator will flash a light and beep to attract attention. Then, the maintaining service will be notified to fix the defibrillator or to change the expired parts.

Cardiac arrhythmias (abnormal heart rhythms) can be life-threatening or simply annoying. Implantable pacemakers were introduced around 1960 to treat slow heart rates that might cause a patient to faint. Sudden cardiac death is usually due to ventricular fibrillation, a very fast chaotic heart rhythm that immobilizes the heart. External defibrillators were used in CCUs, but most patients who experience sudden death are not in hospitals. The introduction of automatic implantable cardiac defibrillators (ICDs) in the mid-1980s provided a safety net for patients at high risk for sudden death. These heart rhythm technologies were expensive, and concerns were raised about their costs and appropriate use. During the final quarter of the century, catheter-based diagnostic techniques were developed to evaluate patients with known or suspected arrhythmias. Cardiologists who focused on heart rhythm disorders were known as electrophysiologists. The emergence of clinical cardiac electrophysiology is an example of continuing subspecialization within cardiology.

Cardiovascular diseases are a leading death cause in the world. Cardiac arrest is one of the most usual, and very quickly fatal, especially in out-of-hospital environments. Defibrillation, aside with cardiopulmonary resuscitation, is an effective means to restart blood circulation and heart operation, even though even these forms of treatment can help just in sadly few situations. Defibrillation was invented and first demonstrated already year 1899, but first in the 2000s portable defibrillators with good automatic functions started to penetrate daily environments of people, especially in urban settings. Nowadays the starting point is that every citizen with normal human functionality should be able to use automated defibrillators. The chapter discusses how modern information and communication technology, especially mobiles services, internet, and location services based on them, could help citizens in the first crucial step in implementing their safety competence in emergency situations by using automatic defibrillators if they could only find them.

Resuscitation on the playing field is at least as important as screening in the prevention of death. Even if a screening strategy is largely effective, individuals will suffer sudden cardiac arrests. Timely recognition of a cardiac arrest with rapid implementation of cardiopulmonary resuscitation (CPR) and deployment and use of automated external defibrillators (AEDs) will save lives. Basic life support, including CPR and AED use, should be a requirement for all those involved in sports, including athletes. An emergency action plan is important in order to render advanced cardiac life support and arrange for transport to medical centres.

In this modern industrialized world, Sustainable Cities have developed several rescue systems with latest technological provinces like camera, IoT’s etc. Though the systems are quite advanced, it becomes difficult to rescue the public during emergency situation, particularly cardiac patients who need immediate medical attention. Especially when the ambulance carrying the patient gets stuck in traffic congestion leading to delayed medical care, it results in instant fatality. To overcome this issue and save the critical patients, an Intelligent Rescue System (IRS) has been developed to assist the people during emergency situation. The system uses an Automatic External Defibrillator (AED) apparatus that uses an electric current to safeguard the person within the short time frame until the ambulance reaches to the destination. Moreover, this system observes the condition of the patient constantly with the help of embedded medical sensors and also works efficiently to track and locate the exact tragic accident sites through GSM.