[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"menu":3,"$f1bBEhGvlEi3uSmAf2ZYpwn0-8k4mBgRDtnjXl3-8qWY":210},{"main":4,"mainTranslated":17,"footer":45,"footerTranslated":109},[5,8,11,14],{"title":6,"url":7},"Course library","https:\u002F\u002Fwww.medmastery.com\u002Fcourse-library",{"title":9,"url":10},"Pricing","https:\u002F\u002Fwww.medmastery.com\u002Fpricing",{"title":12,"url":13},"Earn credits","https:\u002F\u002Fwww.medmastery.com\u002Fcme-credits",{"title":15,"url":16},"Institutions","https:\u002F\u002Fwww.medmastery.com\u002Finstitutions",{"de":18,"es":27,"fr":36},[19,21,23,25],{"title":20,"url":7},"Kurse",{"title":22,"url":10},"Preise",{"title":24,"url":13},"CME-Punkte",{"title":26,"url":16},"Organisationen",[28,30,32,34],{"title":29,"url":7},"Biblioteca de cursos",{"title":31,"url":10},"Precios",{"title":33,"url":13},"Gana créditos",{"title":35,"url":16},"Instituciones",[37,39,41,43],{"title":38,"url":7},"Cours",{"title":40,"url":10},"Tarifs",{"title":42,"url":13},"Obtenir des crédits",{"title":44,"url":16},"Établissements",[46,59,79,97],{"title":47,"group":48,"menu":49},"Company",true,[50,53,56],{"title":51,"url":52},"Our teachers","https:\u002F\u002Fwww.medmastery.com\u002Fteachers",{"title":54,"url":55},"About us","https:\u002F\u002Fwww.medmastery.com\u002Fabout-us",{"title":57,"url":58},"Work with us","https:\u002F\u002Fwww.medmastery.com\u002Fwork-with-us",{"title":60,"group":48,"menu":61},"Product",[62,64,67,70,73,76,78],{"title":63,"url":7},"Courses",{"title":65,"url":66},"Magazine","https:\u002F\u002Fwww.medmastery.com\u002Fmagazine",{"title":68,"url":69},"Podcast","https:\u002F\u002Fwww.medmastery.com\u002Fpodcasts",{"title":71,"url":72},"Webinars","https:\u002F\u002Fwww.medmastery.com\u002Fwebinars",{"title":74,"url":75},"Guides","https:\u002F\u002Fwww.medmastery.com\u002Fguides",{"title":15,"url":77},"https:\u002F\u002Fwww.medmastery.com\u002Finstitutions\u002F",{"title":9,"url":10},{"title":80,"group":48,"menu":81},"Legal",[82,85,88,91,94],{"title":83,"url":84},"Imprint","https:\u002F\u002Fwww.medmastery.com\u002Fimprint",{"title":86,"url":87},"Newsletter policy","https:\u002F\u002Fwww.medmastery.com\u002Fnewsletter-privacy-policy",{"title":89,"url":90},"Privacy policy","https:\u002F\u002Fwww.medmastery.com\u002Fprivacy-policy",{"title":92,"url":93},"Cookie Policy","https:\u002F\u002Fwww.medmastery.com\u002Fcookie-policy",{"title":95,"url":96},"Terms","https:\u002F\u002Fwww.medmastery.com\u002Fterms",{"title":98,"group":48,"menu":99},"Customer support",[100,103,106],{"title":101,"url":102},"FAQs","https:\u002F\u002Fwww.medmastery.com\u002Ffaqs",{"title":104,"url":105},"Contact","https:\u002F\u002Fwww.medmastery.com\u002Fcontact",{"title":107,"url":108},"support@medmastery.com","mailto:support@medmastery.com",{"de":110,"es":143,"fr":177},[111,118,128,137],{"title":112,"group":48,"menu":113},"Unternehmen",[114,116,117],{"title":115,"url":52},"Unsere Dozentinnen und Dozenten",{"title":54,"url":55},{"title":57,"url":58},{"title":119,"group":48,"menu":120},"Produkt",[121,122,123,124,125,126,127],{"title":20,"url":7},{"title":65,"url":66},{"title":68,"url":69},{"title":71,"url":72},{"title":74,"url":75},{"title":26,"url":77},{"title":22,"url":10},{"title":129,"group":48,"menu":130},"Rechtliches",[131,133,134,135,136],{"title":132,"url":84},"Impressum",{"title":86,"url":87},{"title":89,"url":90},{"title":92,"url":93},{"title":95,"url":96},{"title":138,"group":48,"menu":139},"Kundenservice",[140,141,142],{"title":101,"url":102},{"title":104,"url":105},{"title":107,"url":108},[144,151,162,171],{"title":145,"group":48,"menu":146},"Empresa",[147,149,150],{"title":148,"url":52},"Nuestros profesores",{"title":54,"url":55},{"title":57,"url":58},{"title":152,"group":48,"menu":153},"Producto",[154,156,157,158,159,160,161],{"title":155,"url":7},"Cursos",{"title":65,"url":66},{"title":68,"url":69},{"title":71,"url":72},{"title":74,"url":75},{"title":35,"url":77},{"title":31,"url":10},{"title":163,"group":48,"menu":164},"Información legal",[165,167,168,169,170],{"title":166,"url":84},"Aviso legal",{"title":86,"url":87},{"title":89,"url":90},{"title":92,"url":93},{"title":95,"url":96},{"title":172,"group":48,"menu":173},"Atención al cliente",[174,175,176],{"title":101,"url":102},{"title":104,"url":105},{"title":107,"url":108},[178,185,196,204],{"title":179,"group":48,"menu":180},"Entreprise",[181,183,184],{"title":182,"url":52},"Nos enseignants",{"title":54,"url":55},{"title":57,"url":58},{"title":186,"group":48,"menu":187},"Produit",[188,189,190,191,192,193,194],{"title":38,"url":7},{"title":65,"url":66},{"title":68,"url":69},{"title":71,"url":72},{"title":74,"url":75},{"title":15,"url":77},{"title":195,"url":10},"Tarification",{"title":197,"group":48,"menu":198},"Mentions légales",[199,200,201,202,203],{"title":197,"url":84},{"title":86,"url":87},{"title":89,"url":90},{"title":92,"url":93},{"title":95,"url":96},{"title":205,"group":48,"menu":206},"Service client",[207,208,209],{"title":101,"url":102},{"title":104,"url":105},{"title":107,"url":108},{"content":211,"related":283,"meta":353,"internal":363},{"title":212,"leadIn":213,"category":214,"elements":217,"becomeAnExpert":251,"author":273,"readDuration":281,"readDurationFormatted":282},"Treating arrhythmias—defibrillation","Learn how defibrillation works to treat ventricular fibrillation and ventricular tachycardias.",{"id":215,"name":216},1,"Course previews",[218,229,234,239,246],{"type":219,"data":220},"video",{"readDurationInSeconds":221,"video":222},270,{"platform":223,"name":224,"url":225,"size":226},"YouTube","Treating arrhythmias: Defibrillation","https:\u002F\u002Fwww.youtube.com\u002Fwatch?v=P3v-6JYOEes",{"width":227,"height":228},200,113,{"type":230,"data":231},"free_text",{"readDurationInSeconds":232,"text":233},6.933333333333334,"\u003Cp>\u003Cspan style=\"color: #111111; font-family: Roboto, Arial, sans-serif; white-space: pre-wrap;\">Defibrillation is a very effective way of treating ventricular arrhythmias, but how does it actually work? By the end of this video, you'll know how defibrillation treats ventricular fibrillation and ventricular tachycardias. \u003C\u002Fspan>\u003C\u002Fp>",{"type":230,"data":235},{"readDurationInSeconds":236,"title":237,"text":238},14.133333333333333,"Join our ICD Essentials course today!","\u003Cp>Want to learn how to recognize and treat ventricular arrhythmias with ICDs? Take our \u003Ca href=\"https:\u002F\u002Fwww.medmastery.com\u002Fcourse\u002Ficd-essentials\">ICD Essentials course\u003C\u002Fa> and confidently deal with ICDs in a clinical setting. Your instructor, Dr Kristian Webb–a board-certified devices specialist, author, and cardiology education enthusiast based in London–will guide you through the fundamentals of ICD use and troubleshooting.\u003C\u002Fp>",{"type":240,"data":241},"cta",{"readDurationInSeconds":242,"text":243,"buttonText":244,"buttonUrl":245},3.466666666666667,"Become a great clinician with our video courses and workshops","Start learning for free","https:\u002F\u002Fwww.medmastery.com\u002Fuser\u002Fregister",{"type":230,"data":247},{"readDurationInSeconds":248,"title":249,"text":250},124,"Video Transcript","\u003Cp dir=\"ltr\">\u003Cstrong>[00:00:00] \u003C\u002Fstrong>So, when we think about our arrhythmia zones, our VT zones, then we can have different levels of therapy in each of them. So, zone one, might simply be a monitoring zone, so while we look at rhythm and record it but we might not want the device to necessarily treat it. If we look at our second zone, then we might try some anti-tachycardia pacing \u003C\u002Fp>\u003Cp dir=\"ltr\">\u003Cstrong>[00:00:30]\u003C\u002Fstrong> and then some defibrillation. And then in our really fast zone, so in our VF zone, we might just have defibrillation. And there's good reason for this, and that is defibrillation is extremely successful at treating ventricular arrhythmias. So, really, the faster and the nastier that rhythms get, is the more we lean towards using defibrillation as our first line of therapy. So, how does defibrillation work? \u003C\u002Fp>\u003Cp dir=\"ltr\">\u003Cstrong>[00:01:00]\u003C\u002Fstrong> Well, a high energy shock is delivered to the heart. The way the device does this is utilizing either one or two coils on the ICD lead and the device itself. What this does is capture a critical mass of tissue, depolarizing it, all at once, and allowing sinus rhythm to regain control of the heart. Now, it's vastly more successful in \u003C\u002Fp>\u003Cp dir=\"ltr\">\u003Cstrong>[00:01:30]\u003C\u002Fstrong> treating these ventricular arrhythmias than ATP, but it does have its downsides. But first, let's look at a real-life example of where ATP was unsuccessful and so the device eventually resorted to a high-energy shock to treat the rhythm. Now, here we can see detection is met. Two episodes of burst ATP are delivered, both unsuccessful. Two episodes of Ramp ATP are delivered, again, unsuccessful. And eventually, the device decides \u003C\u002Fp>\u003Cp dir=\"ltr\">\u003Cstrong>[00:02:00]\u003C\u002Fstrong> to deliver a high-voltage charge, which successfully terminates the arrhythmia. And of course, this protocol, this therapy protocol is a programmable protocol and would have been put in place, by somebody who is programming the device, to work as they want it. Here, they've gone for four episodes of ATP, before resorting to a high-voltage shock. So, how are we able to generate such a high voltage shock from a battery, which is often \u003C\u002Fp>\u003Cp dir=\"ltr\">\u003Cstrong>[00:02:30] \u003C\u002Fstrong>as little as 3.1 volts? Well, it's all down to the capacitor. What the capacitor does is store energy, and the battery is able to pour loads of its energy into the capacitor and fill it up, until it's full with the high voltage charge, ready to go. At that point, the capacitor delivers all the energy in one go, via the ICD lead. Now, the capacitor does take time to charge, and we have to factor \u003C\u002Fp>\u003Cp dir=\"ltr\">\u003Cstrong>[00:03:00]\u003C\u002Fstrong> that into our decision-making process. If you think about the arrhythmia, we have a detection time delay, where the arrhythmia has to be sustained long enough for the device to consider therapy. If detection is met, and the device decides to charge for shock, we have further time before therapy is eventually delivered. Now, it's not something that we get overly concerned about but it's just something to be mindful of, that we detect the arrhythmia and then actually, \u003C\u002Fp>\u003Cp dir=\"ltr\">\u003Cstrong>[00:03:30] \u003C\u002Fstrong>there's going to be a delay until the high-voltage shock is delivered, whilst the capacity charges. Another consideration is battery depletion. Now, obviously, if we think about the battery pouring loads of its energy into the capacitor for every shock, this can really deplete the energy. In actual fact, estimate suggests that for every shock delivered by the device, this can reduce the battery longevity by one month. And if you think that some people can have up to 12 or even more shocks \u003C\u002Fp>\u003Cp dir=\"ltr\">\u003Cstrong>[00:04:00] \u003C\u002Fstrong>during an event, this can have huge implications on how long the device is going to last.\u003C\u002Fp>",{"courses":252,"showAwardsBelow":48},[253],{"id":254,"isFreeCmeCourse":255,"title":256,"type":257,"specialization":258,"teachers":260,"cmeCredits":262,"teacherIllustration":263,"backgroundImage":264,"relativeUrl":265,"lastChanged":266,"created":267,"description":268,"relativeURL":265,"meta":269},2879,false,"ICD Essentials","course",[259],"Cardiology",[261],"Kristian Webb",4,"https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F99f55f26-7871-4f86-8f63-6e407058d385","https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F99f55ed7-6b12-4fde-8f31-4c0fab7ac531","\u002Fcourses\u002Ficd-essentials","1763556338","1472492257","This course teaches you how ICDs are able to recognize and treat ventricular arrhythmias, arming you with the knowledge to be comfortable managing ICDs in a clinical setting. By the end of the course you’ll understand how to optimize ICD settings, devise appropriate treatment plans, confidently answer your patient’s ICD-related questions, and troubleshoot the most common ICD problems.",{"duration":270,"quizzes":271,"lessons":272},8786,6,41,{"id":274,"name":261,"image":275,"profession":276,"relativeUrl":279,"specializations":280},2177,"https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F9c43cefd-a550-4580-9c3d-cc6547589d24",{"name":277,"description":278},"Cardiac device specialist","Board-certified devices specialist from London. Author and cardiology education enthusiast.","\u002Fteachers\u002Fkristian-webb",[259],152,"3m",[284,310,334],{"id":285,"title":286,"text":287,"image":288,"author":296,"path":305,"readDuration":228,"readDurationFormatted":306,"internal":307},1353,"Gestational age ultrasound in early pregnancy evaluation","Learn how to obtain the correct ultrasound views and accurately measure crown-rump length and biparietal diameter to estimate gestational age.",{"alt":289,"title":290,"size":291,"location":293},"Gestational age ultrasound image demonstrating crown-rump length measurement in the first trimester","",{"width":292,"height":292},900,{"bucket":294,"key":295},"public-drupal-medmastery-assets-production","\u002F2026-05\u002FC144(1)_magazine image.png",{"id":297,"title":298,"relativeURL":299,"image":300,"professionLong":301,"profession":302,"weight":304},2976,"Viveta Lobo, MD","\u002Fteachers\u002Fviveta-lobo-md","https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F9c43cefc-7f09-4a9a-9865-4aeea3cef318","\u003Cspan id=\"docs-internal-guid-57fc7959-7fff-8d74-e680-4d8102bdd254\">Associate Professor, Department of Emergency Medicine at Stanford University Medical Center in California, USA.\u003C\u002Fspan>",{"name":303},"Emergency medicine physician",507,"\u002Fmagazine\u002Fgestational-age-ultrasound","2m",{"created":308,"updated":309,"published":309},1780168728,1780169720,{"id":311,"title":312,"text":313,"image":314,"author":319,"path":327,"readDuration":328,"readDurationFormatted":329,"internal":330},1352,"Injectable cholesterol medication: using PCSK9 inhibitors","Not all patients reach their LDL targets with oral therapy. Learn when injectable cholesterol medication helps and how PCSK9 inhibitors work.",{"alt":315,"title":290,"size":316,"location":317},"Two PCSK9 inhibitor autoinjector pens—an injectable cholesterol medication—shown on a light blue background.",{"width":292,"height":292},{"bucket":294,"key":318},"\u002F2026-05\u002FC121(3)_magazine image.png",{"id":320,"title":321,"relativeURL":322,"image":323,"professionLong":324,"profession":325,"weight":262},1563,"Franz Wiesbauer, MD MPH","\u002Fteachers\u002Ffranz-wiesbauer-md-mph","https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F9c43cef0-41ee-4005-9e4a-d8711c816401","Franz is the founder and CEO of Medmastery. He is an internist with a specialization in cardiology and a master’s in public health from Johns Hopkins University.",{"name":326},"Internist","\u002Fmagazine\u002Fpcsk9-injectable-cholesterol-medication",279,"5m",{"created":331,"updated":332,"published":333},1779483663,1779495630,1779495631,{"id":335,"title":336,"text":337,"image":338,"author":344,"path":346,"readDuration":347,"readDurationFormatted":348,"internal":349},1351,"Starting statins as first-line therapy for hyperlipidemia","Starting statins: how to choose the right agent for your patient, match statin intensity to cardiovascular risk, and monitor effectively after initiation.",{"alt":339,"title":290,"size":340,"location":342},"Healthcare provider discussing starting statins with a patient and reviewing a medication bottle",{"width":341,"height":341},660,{"bucket":294,"key":343},"\u002F2026-05\u002FC121(2)_magazine image.png",{"id":320,"title":321,"relativeURL":322,"image":323,"professionLong":324,"profession":345,"weight":262},{"name":326},"\u002Fmagazine\u002Fstarting-statins-first-line-therapy",238,"4m",{"created":350,"updated":351,"published":352},1778960150,1779196374,1778961827,{"seo":354,"og":356},{"title":355,"description":213},"Treating arrhythmias—defibrillation | Medmastery",{"title":355,"description":213,"image":357},{"alt":290,"title":290,"size":358,"location":361},{"width":359,"height":360},2526,1356,{"bucket":294,"key":362},"\u002Fmigrated-images\u002FScreen Shot 2018-01-10 at 9.33.13 PM.png",{"id":364,"created":365,"updated":366,"published":365},175,1515580534,1655189586]