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How do defibrillators work? What is depolarization? What does electricity have to do with it? What is a joule? What is monophasic defibrillation? What is biphasic defibrillation? What is Transthoracic Impedance? How do I cardiovert someone? What bad things do I have to watch for during cardioversion or defibrillation? What things should I do after the cardioversion/defibrillation? What is cardioversion? What is a defibrillator? How do defibrillators work? What is depolarization? What does electricity have to do with it? What is a joule? What is monophasic defibrillation? What is biphasic defibrillation? What is transthoracic impedance? How do I cardiovert someone? Make sure your patient is oxygenated. Why is your patient doing this rhythm in the first place? Ischemia? Or is the rhythm itself creating ischemia, because the heart is using up all the oxygen its getting, going so fast, but still needs more? (Thats what they mean by rate-related ischemia.) Anyhow, more oxygen to the myocardium is usually better than less, so apply some! (Does your patient have COPD? Why am I asking?) The Buttons: Button One: Turn the machine on, and pick the amount of energy you want to give. The ranges vary for different situations, but the general rules seem to be: for cardioversion start low usually 50 joules for example, for elective cardioversion out of a relatively stable, a-fib with RVR. For VT/VF, ACLS says to start with 200 joules. (Thats the monophasic machine number with the biphasic machine you start with 150 joules.) Usually you turn a twisty dial control to set the joules level. The numbers are clear, and theres a simple arrow pointer that you line up with the number that you want. Make it a practice, every now and then, to go over to the machine and make sure you know how to work it. Familiarity comes with time, so do this a couple of times every week - at least when youre starting out in the units. Obviously, you dont want to have to stand there trying to figure out how the machine works in the middle of some busy situation. At this point, make sure your patients rhythm is clearly visible on the defibrillator monitor. Cardioversion is by definition elective, so you should have time to do these things, or youd be defibrillating, right? In this situation, take the time to connect the patient to the defibrillators sensing cable. External pacing boxes use the same method generally, they have to see the patient somehow. Three sticky electrodes set up a standard lead II. Three wires go to a thicker cable, the cable plugs into a socket on the machine, and you should see the rhythm clearly. The monitor should let you choose between leads I, II , III (or paddle view but thats for quick-look, usually in defib) choose the one that gives the clearest upright QRS waveform, Now comes the synch button. This is what makes cardioversion different from defibrillation, and you absolutely must use this properly. Luckily, its not hard at all. Push the button. You should see a blip, or a dot of some kind that the machine puts on each QRS this shows you that the machine clearly sees the QRS, and knows when to deliver the shock remember that cardioversion has to be properly timed to avoid the T-wave. Heres an important point about the difference between cardioversion and defibrillation: with the synchronization on, the machine will wait after you hit the discharge buttons to make sure of its timing, and it wont discharge until its ready. So be prepared to hold those paddles down, hit those buttons, and wait it might only be a second or two, but if youre not ready for what the machine is doing, you may decide that its not working. Button Two: Charge the machine. Listen for the charging tones. Button Three: This discharges the electricity from the paddles, so make sure that everything is quite ready before you do this. Several things need to happen: Make sure the paddles have conduction gel on them. The electricity will not be properly transmitted to the chest wall without it. Also, even with the gel these paddles will often cause a second-degree skin burn imagine what would happen without the gel! Make sure that youve cleared the bed. This means that just before defibrillating, you take a quick but careful look around to make sure that no one is holding onto the bed, or leaning on it. You should not be leaning against the bed either you should get the rails down, and then lean over the patient with the paddles in your hands. Yes, its true that modern beds are electrically designed so well that any stray electricity should go into the grounding system, but would you want to be wrong and have to shock your friend the pharmacist who was leaning over the bottom of the bed, after you put him into VT? Beds clear? Steady tone from the machine? Place the paddles on the chest heres an image from the web I know if its elective, were supposed to be using the pads. What if you dont got no pads? What if youre in the CT scanner? Or MRI? Should you go running into the scanner room with the defibrillator? (NO!) What should you do? Who knows what the round silver thing is? Has to do with implanted pacemakers http://www.usuhs.mil/psl/images/defib.JPG The idea is that the paddles are sending current from one end of the heart to the other: see that? The upper paddle sits where the negative lead II electrode lives, and the lower one sits where the positive electrode lives, so the current travels along the normal conduction path, and so depolarizes the whole system at once. (I know: I repeat myself a lot my kids remind me all the time. Those stupid ginkgo pills I can never remember to take them ) Hold the paddles down firmly the book says 25 pounds of pressure which is more than you might think. My wife brings a scale to her ACLS classes, and has the student press the paddles down on the scale until it reads 25 pounds. (Is she smart or what?) It turns out to be a lot of pressure. Clear the bed. Yes, apparently it is quite true that the current can be transmitted to someone leaning on, or holding onto the patients bed. One, Im clear! Two youre clear! Three everybodys clear! Push the third button. Our paddles have a button number three on each of them, so that you dont mistake: you have to hit both, deliberately, to discharge the paddles. Remember now: are you defibrillating or cardioverting here? Will the paddles discharge right away, or will they wait and should you? Watch the patient and the monitor at the same time this is why you have two eyes, right?, to watch two things at once? Ask an old ICU nurse how many things he can watch at once did the rhythm convert to normal sinus? Or VT? Or worse? Or was there no change at all? Whats the patients pressure like? Whats the sat like? Whats your pressure like? http://www.virtualcpr.com/images/defib_pos.jpg How do I defibrillate someone? What bad things do I have to watch for during cardioversion or defibrillation? What things should I do after cardioversion/defibrillation? What is cardioversion? Why is the cardioversion procedure needed? Where is the procedure performed? Should I take my medications? Can I eat before the procedure? What should I wear? What should I bring? What happens before the procedure? Will I be monitored? Will I be awake during the procedure? What happens during the procedure? How long does the procedure last? Will I have to stay in the hospital? What should I expect during the recovery? How will I feel after the procedure? What is an arrhythmia? How do I know if I have an arrhythmia? What are the treatment options? What medication is available for arrhythmias? What is cardioversion? What are the ablation options? What implantable devices are used to treat arrhythmias? What if I do nothing? Is catheter ablation a good choice? Why choose cryoablation? How do I prepare for cryoablation? What is the experience of cryoablation patients? What can I do next? What is cardioversion? What is a defibrillator? The goal here is to try to understand what the machine is trying to do. Lets say your patient pops into a nasty rhythm not handling it very well, not making much of a blood pressure; and you want to deliver electricity what do you need? 4-1: The monitor. First: you need to be able to see whats going on. This is of course one of the reasons why our patients are monitored at the bedside: so you can see what rhythm your patient is in. Defibrillators are built to travel so they have a monitor screen built in. Second: suppose you want to cardiovert instead of defibrillate in other words, deliver a timed shock rather than a blind one. The machine is going to need to see the rhythm to do this, and you need to be able to make sure its seeing the right thing. This is a useful concept: lots of the devices in the unit are trying to see the patient in one way or the other your job is to make sure they do, and that you learn how to interpret what theyre trying to tell you. Anyhow, the machine needs to see the patient. Youre either going to have to put sensing wires on the patient that go back into the defibrillator (which may not have time for), or use the paddles as sensors. Our machines have a paddle-monitor mode called quick look the procedure is to gel up the paddles, make sure the monitor is in paddle mode (the word paddle appears on our monitors screens). Hold the paddles firmly against the skin in the defib position (with gel!) and get a good look at the patients rhythm. I bet that the newer defib pads do the same thing. I should know this 4-2: The capacitor. Unless you have a really long electric cord, youll need a battery to run any transportable medical device. Rechargeable batteries are why all these devices are so flippin heavy, and the defibrillator is no exception, so we keep ours on rolling carts that we can whip up and down the unit. The battery stores electricity, but only if the machine is plugged in when youre not using it. You do not want to arrive on the scene with a dead defibrillator! The battery feeds electricity into a capacitor this I think of as a black box that holds whatever amount of electricity you choose, for a fixed amount of time. The capacitor fills up with electricity when you push the button that selects the charge you want to give. Our machines charge up with sounds that let you know whats happening: once you push the button, you hear a rising whine as the charge collects - that turns into a steady, high-pitched whistle when the machine is ready to discharge. Loud, but effective. Practice this. 4-3: Numbered buttons: 1,2,3: output dials Here the goal is to try to keep things very simple: there are three things you need to do when operating the defibrillator, and the people who make these machines are trying to help you do them when you may be, let us say, a bit distracted by the situation. Im going by the machines in our institution here make sure you know what to do with your own, although the three moves are probably the same: 1: Button number one (actually on our machines its a dial, but it has a big number one next to it) turns the machine on, and sets the machine with the joules (the amount of electrical energy) you want to give. 2: Button number two charges the capacitor to the level you picked. At this point we hear the rising tones that tell you that the capacitor is charging up, and then the steady tone that says that its ready to go. 3: Button number three lives on the paddles (there are actually two number three buttons, so you dont squeeze just one by mistake and fire the device before youre ready) and discharges them. 4-4: The paddles and the pads: I hear that (rather like myself), paddles are considered old-tech nowadays the thing to do is to slap on sticky defibrillation pads that hook up to the machine the same ones as external pacing pads then stand back, charge and discharge the machine from a few feet away. I have seen this done, but most times in our unit we make one quick defib move or two theres much less defibrillating going on since clotbusters came along and fewer people complete their MIs. In the MICU, I think that the pads are more for the elective cardioversion kind of maneuver rather than the emergent defibrillation thing. The critical point is that you really want to just jump in there and shock that rhythm you dont want to futz around with the pad packaging, the wires, changing the cable connectors so the pads are hooked up instead of the paddles get the job done quickly. If the paddles are hooked up and ready, use them dont waste time; you can hook up the pads later and leave them on the patient for use if the problem happens again. How do defibrillators work? 5-1: What is depolarization? (I have to stick this in: my son pointed out a while ago that when a white bear is captured, and taken from his iceberg to the zoo, he becomes de-polarized. Excellent!) Heres how I understand it. Cardiac pacing and conduction cells work by a sort of magic ion pump dance: the concentrated ions on the outside of the cells all flow inwards at once, then outwards again. Swoosh, swoosh. The charges around the cell reverse as the ions flow in, or out, and the polarity flips: the cells are de-polarized then re-polarized. Is that clever engineering, or what? In the process of the depolarization dance along the cardiac conduction pathway, a measurable electrical energy is generated: (P-wave for atria, QRS for ventricles remember?) Then re-polarized. (T-wave.) The conduction cells do this dance in sequence, along the conduction route from the SA node to the AV node, along through the bundle of His, (hey - wheres Her bundle?) and on downwards through the bundle branches into the contractile tissues in the ventricles. Fine so far. But what happens in a lethal arrythmia? The big sign hanging on the inside of the walls of the ventricles says: whosoever shall paceth these walls the fastest, shall captureth. Right?- the fastest pacemaker always captures the heart. So what to do when a rapid, excitable, unpleasant little terrorist pacemaker down in the ventricles somewhere has taken over the rhythm, and generates VT? 5-2: What does electricity have to do with it? As we saw, it turns out that applying a jolt of electricity along the conduction pathway makes all the cells depolarize at once, interrupting the sequence. In sinus rhythm the conduction cells do their sequential dance along the normal route. In VT, they establish some other route backwards along the normal conduction path? (Anybody know who the EPS fellow is this month?) Depolarizing all the cells at once interrupts the sequence as its travelling in whatever direction - and hopefully lets one of the intrinsic pacemakers take over. Which hopefully it does - but sometimes doesnt what can you do then? 5-3: What is a joule? Another way to think of it: I remember being told once that 360 joules is about the same amount of power thats required to start a big diesel truck engine. (!) 5-4: What is monophasic defibrillation? Monophasic means that the current delivered by the machine travels in only one direction between the paddles. This has been the standard way of doing things for many years, but is now (like your preceptor) seen as out of date, and is being replaced with a newer method, called biphasic defibrillation. 5-5: What is biphasic defibrillation? Biphasic means that the current initially moves towards the positive paddle, then reverses direction and heads the other way. (My daughter used to drive this way.) The difference for us at the bedside is that biphasic shocks seem to be just as effective as the monophasic ones, but at lower power levels. This is a good thing for a couple of reasons: first, less power applied means less trauma to the patient. Second, less power required means longer battery life, and apparently all implanted defibrillators now use biphasic shocks for this reason they can also be made smaller. I remember seeing patients come in with what looked like a small brick implanted under the skin of their chests 5-6: What is transthoracic impedance? This is the electrical resistance that the patients chest creates between the paddles. If its high, then more electricity will be needed to successfully shock the patient. Apparently the new automatic external defibrillators that are being put in airports, phone booths and lunchboxes practically are able to automatically measure a patients impedance, and adjust the amount of electricity they deliver to match: less for a small person, more for a large one just the right amount. Nice trick! How do I cardiovert someone? Okay lets cardiovert somebody. Any volunteers from the audience? Many of the moves that you will make in either cardioversion or defibrillation are the same so lets go over the basics first, and then well get to the specifics. Lets remember that the decision to cardiovert means that your patient is not-quite-in-a-code-yet. As in every critical situation, remember: theres time - more time than you think - available for you to make sure of your plan. How long until anoxic brain injury 3 to 6 minutes, right? Five minutes times sixty, thats 360 seconds a lot of seconds! There is always all the time you need. Lets take a little of that time now to look at what needs to be set up: Make sure that you have everybody you need. In our hospital, elective cardioversions are supposed to include the presence of anesthesia, in case the patient codes and needs intubation. You certainly want to have the team coming if you start a non-elective electrical maneuver! Make sure your patient has IV access. More is better. If my patient were being intubated (this situation might turn into an intubation), Id have a gravity bag dripping slowly. Make sure your line isnt infiltrated. (How?) Make sure your patient is unconscious, or appropriately sedated. This is not a procedure to do on someone whos awake. Make sure your patient is oxygenated. Why is your patient doing this rhythm in the first place? Ischemia? Or is the rhythm itself creating ischemia, because the heart is using up all the oxygen its getting, going so fast, but still needs more? (Thats what they mean by rate-related ischemia.) Anyhow, more oxygen to the myocardium is usually better than less, so apply some! (Does your patient have COPD? Why am I asking?) The Buttons: Button One: Turn the machine on, and pick the amount of energy you want to give. The ranges vary for different situations, but the general rules seem to be: for cardioversion start low usually 50 joules for example, for elective cardioversion out of a relatively stable, a-fib with RVR. For VT/VF, ACLS says to start with 200 joules. (Thats the monophasic machine number with the biphasic machine you start with 150 joules.) Usually you turn a twisty dial control to set the joules level. The numbers are clear, and theres a simple arrow pointer that you line up with the number that you want. Make it a practice, every now and then, to go over to the machine and make sure you know how to work it. Familiarity comes with time, so do this a couple of times every week - at least when youre starting out in the units. Obviously, you dont want to have to stand there trying to figure out how the machine works in the middle of some busy situation. At this point, make sure your patients rhythm is clearly visible on the defibrillator monitor. Cardioversion is by definition elective, so you should have time to do these things, or youd be defibrillating, right? In this situation, take the time to connect the patient to the defibrillators sensing cable. External pacing boxes use the same method generally, they have to see the patient somehow. Three sticky electrodes set up a standard lead II. Three wires go to a thicker cable, the cable plugs into a socket on the machine, and you should see the rhythm clearly. The monitor should let you choose between leads I, II , III (or paddle view but thats for quick-look, usually in defib) choose the one that gives the clearest upright QRS waveform, Now comes the synch button. This is what makes cardioversion different from defibrillation, and you absolutely must use this properly. Luckily, its not hard at all. Push the button. You should see a blip, or a dot of some kind that the machine puts on each QRS this shows you that the machine clearly sees the QRS, and knows when to deliver the shock remember that cardioversion has to be properly timed to avoid the T-wave. Heres an important point about the difference between cardioversion and defibrillation: with the synchronization on, the machine will wait after you hit the discharge buttons to make sure of its timing, and it wont discharge until its ready. So be prepared to hold those paddles down, hit those buttons, and wait it might only be a second or two, but if youre not ready for what the machine is doing, you may decide that its not working. Button Two: Charge the machine. Listen for the charging tones. Button Three: This discharges the electricity from the paddles, so make sure that everything is quite ready before you do this. Several things need to happen: Make sure the paddles have conduction gel on them. The electricity will not be properly transmitted to the chest wall without it. Also, even with the gel these paddles will often cause a second-degree skin burn imagine what would happen without the gel! Make sure that youve cleared the bed. This means that just before defibrillating, you take a quick but careful look around to make sure that no one is holding onto the bed, or leaning on it. You should not be leaning against the bed either you should get the rails down, and then lean over the patient with the paddles in your hands. Yes, its true that modern beds are electrically designed so well that any stray electricity should go into the grounding system, but would you want to be wrong and have to shock your friend the pharmacist who was leaning over the bottom of the bed, after you put him into VT? Beds clear? Steady tone from the machine? Place the paddles on the chest heres an image from the web I know if its elective, were supposed to be using the pads. What if you dont got no pads? What if youre in the CT scanner? Or MRI? Should you go running into the scanner room with the defibrillator? (NO!) What should you do? Who knows what the round silver thing is? Has to do with implanted pacemakers http://www.usuhs.mil/psl/images/defib.JPG The idea is that the paddles are sending current from one end of the heart to the other: see that? The upper paddle sits where the negative lead II electrode lives, and the lower one sits where the positive electrode lives, so the current travels along the normal conduction path, and so depolarizes the whole system at once. (I know: I repeat myself a lot my kids remind me all the time. Those stupid ginkgo pills I can never remember to take them ) Hold the paddles down firmly the book says 25 pounds of pressure which is more than you might think. My wife brings a scale to her ACLS classes, and has the student press the paddles down on the scale until it reads 25 pounds. (Is she smart or what?) It turns out to be a lot of pressure. Clear the bed. Yes, apparently it is quite true that the current can be transmitted to someone leaning on, or holding onto the patients bed. One, Im clear! Two youre clear! Three everybodys clear! Push the third button. Our paddles have a button number three on each of them, so that you dont mistake: you have to hit both, deliberately, to discharge the paddles. Remember now: are you defibrillating or cardioverting here? Will the paddles discharge right away, or will they wait and should you? Watch the patient and the monitor at the same time this is why you have two eyes, right?, to watch two things at once? Ask an old ICU nurse how many things he can watch at once did the rhythm convert to normal sinus? Or VT? Or worse? Or was there no change at all? Whats the patients pressure like? Whats the sat like? Whats your pressure like? Ok lets do the pads. Theres some discussion about where they should go: This way, they take the same positions as the paddles would, right? http://www.virtualcpr.com/images/defib_pos.jpg This is the other way: antero-posterior pad placement. Theres all sorts of learned argument about which way works better but weve recently gone with this one. This pad arrangement does seem to work better for transcutaneous pacing All other things being equal, the pads really are a nice development. Theyre larger in area than the paddles, and much stickier, which means less chance of burns, better transmission of the electricity just make sure you know which method to use, and when. 6-1: Cardioverting A-fib: Heres a nice strip of a not really too rapid a-fib, followed by artifact from the shock, and then what? Its a little fuzzy - Ive blown it up a bit too big on purpose so you can really see. See the shock artifact the big ugly thing there? How about this next one? Did it work? Whats the rhythm after the shock? My wife the ACLS instructor says that you should start with low monophasic discharge settings, 50 joules, followed by 100, then 200, then 300 if the patient doesnt convert. A chart out on the web says that the equivalent biphasic shocks would be: 70, 120, 150, and 170 joules. After that, you might have to try chemical maneuvers again. Then again, it does pay to think a little about why your patient is doing this rhythm in the first place. Is she septic? Does the rapid rhythm mean that her heart is trying to keep the her pressure up in the face of a totally dilated arterial bed? Maybe shes dry. Maybe ischemic. Maybe all of the above. Maybe shes being totally stressed because of vent-weaning trials that shes not ready for how does the rhythm fit into the whole picture? It always pays to think about these things 6-2: Cardioverting VT-with-a-pressure: As opposed to VT-with-no-pressure, right? This scenario is a little closer to a real code situation than the a-fib one, because these folks are very likely to lose whatever pressure theyve got, at any time. Jayne says that you should set up for an elective cardioversion if youve got the time, but be ready to defibrillate pulseless VT at a moments notice. In practice, if your patient is sitting there smiling at you while in VT on the monitor, the team will try chemical cardioversion first. Up until recently this involved a lidocaine bolus, followed by a drip, then maybe procainamide nowadays I understand that the first drug to try is amiodarone, 300mg IV over ten minutes, followed by a drip, and then maybe the procaine. Would someone please find out and let me know? How do I defibrillate someone? 7-1: Defibrillating pulseless VT 7-2: Defibrillating VF This is by definition a code. In this situation the ACLS is very clear: shock them first. I would just add establish unresponsiveness, right? Could be embarrassing if the rhythm turned out to be monitor artifact of some kind. (Ask me how I learned that.) It also helps to remember if your patient is a DNR Heres a pretty good strip, probably from an electrophysiology lab: the official description says that whats happening here is first sinus rhythm, then pacing impulses to induce VT then a defibrillation shock, and then what? CCU nurses: what rhythm does that look like, there in the middle? Anybody got some mag in her pocket? Defibrillation is obviously not an elective procedure the studies show that the most effective thing to do in both pulseless VT and VF is go right on in there and shock them, starting with 200, then 300, then 360 joules (or 150/150/150 when using a biphasic device.) In this situation you dont wait for the paddles to see the patients rhythm, you dont wait for anything. One thing you should do is to keep the paddles on the patients chest between the shocks (Shock shock shock!) they may be the only system you have running to monitor the patients rhythm. The monitor should be set to paddle view when defibbing theres a button marked lead push it a couple of times to cycle through views until the monitor screen says paddles but do that after youve shocked the patient! What bad things do I have to watch for during cardioversion or defibrillation? Weve covered a lot of them already: Dont shock a patient whos awake! Dont forget to synchronize when cardioverting a-fib can be turned into v-fib this way. Dont forget the conduction gel. Dont forget to clear the bed. Try to keep the process orderly. This means keeping yourself calm and deliberate when youre not really sure you can. Set up systematically. Set up communication with the appropriate team member for orders dont take orders from two doctors at once! Do your best. Remember that no matter what situation youre in, you may shortly be in a full-fledged code make sure that backup help is on the way. What things should I do after cardioversion/defibrillation? Monitor the patient carefully is the patient staying in the converted rhythm? Keep the patient well-oxygenated. This is not the time to wean your patients oxygen! I would aim for a sat no lower than 98%. Remember however, about COPD patients and oxygen treatment Check up on your patients labs does she need K+, or magnesium? Is she acidotic? not a helpful thing. Get a 12-lead after the cardioversion for documentation- was the patient having chest pain? Does she still? Is it gone now? Can she tell? Talk to the team about cycling re-CPKs and troponin studies. Assess the patients skin does he need treatment for skin burns? a. Airway management b. Arrythmias, Defibrillation, and Pacing c. IV Access, Resuscitation, Circulatin, and Monitoring d. Infant CPR and Ventilation e. Review Questions f. Appedices: Pharmacology, Algorithm Protocols g. Chamber Abnormalities and Intraventricular Conduction Defects h. SA and AV Nodal Block i. Ischemia and Infarction j. Reentrant Supraventricular Tachycardias k. Ectopic Supraventricular Tachycardias l. Extrasystoles and Pre-excitation Syndromes m. Differential Diagnosis of Wide QRS Tachycardias n. Medication and Electrolyte Effects, Miscellaneous Conditions o. Electronic Pacemakers What is cardioversion? Cardioversion is a procedure in which an electrical shock is delivered to the heart to convert an irregular or fast heart rhythm (called an arrhythmia) to a normal heart rhythm. During cardioversion, your doctor uses a cardioverter machine to send electrical energy (or a shock) to the heart muscle to restore the normal heart rhythm. Cardioversion can be used to treat many types of fast or irregular heart rhythms. The most common irregular heart rhythms that require cardioversion include atrial fibrillation and atrial flutter. Life-saving cardioversion may be used to treat ventricular tachycardia (a rapid, life-threatening rhythm originating from the lower chambers of the heart). Why is the cardioversion procedure needed? Cardioversion has been recommended by your doctor to restore your heart rate and rhythm to normal, so you heart can pump as it should. Sometimes, irregular heart rhythms can cause symptoms including: * A pounding or fluttering in your chest * Shortness of breath * Chest discomfort * Dizziness or extreme fatigue These symptoms are signs that your heart is not pumping enough blood to your body. Even if you barely notice your symptoms, irregular heart rhythms that are left untreated can lead to more serious problems, such as a heart attack or stroke.< /p> If the cardioversion procedure is recommended for you, please ask your doctor to discuss the specific risks and benefits of the procedure. Cardioverter Defibrillator Defibrillator used to deliver energy to the heart during cardioversion Cardioversion Where is the procedure performed? In most cases, the cardioversion procedure takes place in the Electrophysiology Lab. Before the Procedure You will receive an instruction sheet that describes how to prepare for the procedure. Heres an overview of those instructions. To Obtain Your Arrival Time: The day before your scheduled procedure, please call 800.223.2273 and ask for pager number 21215, the EP scheduling nurse. Please call between 3:00 and 5:00 p.m. to find out what time you should arrive for your procedure. If your procedure is scheduled for a Monday, please call the Friday before. If your procedure is scheduled after a holiday, please call the last business day before the holiday. Please do not call the Cleveland Clinic Operator or the Admitting Office for information about your procedure. We will notify you if there are any changes to your procedure schedule. The time you are told to report for your procedure is the check-in time and not the actual time of the procedure. The check-in time allows for final preparations to occur before the procedure. Emergency situations and unexpected delays may change the daily procedure schedule and may cause your procedure to be delayed or possibly canceled. Should I take my medications? Continue to take all of your medications as prescribed on the day of the procedure, unless you have been given other instructions. If you need to take medications the morning of the procedure, please only drink small sips of water to swallow them. When you call for your procedure time, please ask the nurse for specific guidelines about taking Coumadin (warfarin) on the day of the procedure. If you have diabetes, ask the nurse how to adjust your diabetes medications or insulin before the procedure. Can I eat before the procedure? Eat a normal meal the evening before your procedure. However, DO NOT eat, drink or chew anything after 12 midnight before your procedure. This includes gum, mints, water, etc. If you must take medications, only take them with small sips of water. When brushing your teeth, do not swallow any water. What should I wear? * Wear comfortable, easy-to-fold clothes when you come to the hospital. You will change into a hospital gown for the procedure. Here are some other guidelines to follow before the procedure: * When getting ready, please do not wear makeup and remove nail polish. * Do not use deodorant, powder, cream or lotion on your back or chest, as this may interfere with the adhesive pads that are placed during the procedure. * When you brush your teeth, avoid swallowing any water. * Please leave all jewelry (including wedding rings), watches and valuables at home. What should I bring? Bring a complete list of your medications. Also bring one-day supply of your prescription medications. Do not take these medications without first talking with the doctor or nurse. Please bring a responsible adult who can drive you home after the procedure. The medication given during the procedure will make you drowsy, so it is unsafe for you to drive. You will not be able to drive for 24 hours after the procedure. What happens before the procedure? Before the procedure begins, a nurse will help you get ready. You will be given a hospital gown to change into. You may keep your clothes in a locker or you may give them to a family member. You will lie on a bed and the nurse will start an IV (intravenous) line in a vein in your arm or hand. The IV is used to deliver medications and fluids during the procedure. EKG patches and adhesive cardioversion pads will be placed on your chest and sometimes on your back. Men may have their chest hair shaved if necessary. During the Procedure Will I be monitored? The nurse will connect you to several monitors that allow the health care team to check your heart rhythm and blood pressure during the procedure. (See box below.) You are continually monitored during the procedure. Will I be awake during the procedure? No. A medication will be given through your IV to make you fall asleep during the procedure. What happens during the procedure? While you are asleep, the doctor will use the cardioverter machine (defibrillator) to deliver specific amounts of energy to your heart through the cardioversion patches. The shock interrupts the abnormal electrical rhythm and restores a normal heart rhythm. Although the procedure only takes a few seconds, several attempts may be needed to restore the normal heart rhythm. In some people, a moderately invasive imaging test called a transesophageal echocardiogram (TEE) may be performed before the cardioversion to evaluate blood flow across the heart. During this test, a narrow tube with a camera at the tip is swallowed so the doctors can get a closer view of your heart. If a TEE is recommended, you will receive more information about how the procedure is performed. How long does the procedure last? The procedure itself lasts only a few minutes. However, the preparation and recovery time for the procedure may add a few hours to your appointment. Please plan to stay at the Cleveland Clinic from 4 to 6 hours for your appointment. If you have an appointment with your physician on the same day of the procedure, please plan to spend the entire day at the Cleveland Clinic. Monitors During the Procedure Cardioverter: Attached to one sticky patch placed on the center of your back and one on your chest. This allows the doctor and nurse to pace your heart rate if it is too slow, or deliver energy to your heart if the rate is too fast. Electrocardiogram or EKG: Attached to several sticky electrode patches placed on your chest, as well as inside your heart. Provides a picture on the monitors of the electrical impulses traveling through the heart. Blood pressure monitor: Connected to a blood pressure cuff on your arm. Checks your blood pressure throughout the procedure. Oximeter monitor: Attached to a small clip placed on your finger. Checks the oxygen level of your blood. Fluoroscopy: A large X-ray machine will be positioned above you to help the doctors see the leads on an X-ray screen during the procedure. Cardioversion Monitors After the Procedure Will I have to stay in the hospital? No. In most cases, you will go home the same day of the procedure. What should I expect during the recovery? You will gradually wake up after the procedure. Once you are fully awake, the doctor will tell you if the cardioversion successfully converted your heart rhythm to normal. Your doctor will discuss your medications, other treatment options and when to return for follow-up appointments. Be sure to ask the doctor if you can continue taking your previous medications. You will be taken to a recovery area where you will be offered something to eat and drink. Your family may visit you in this area. An EKG may be performed. Your doctor will tell you when you can go home. How will I feel after the procedure? During the first few days after the procedure, you may feel tenderness on your chest wall where the cardioversion pads were placed. You will be given a tube of hydrocortisone cream to help relieve skin discomfort on your chest; apply as needed. The doctor will tell you what over-the-counter medications you can take for pain relief. Please tell your doctor or nurse if your symptoms are prolonged or severe. The sedation given during the procedure may make you feel drowsy; therefore you should not drive or operate machinery until the day after the procedure. Will I be able to drive myself home? No. For your safety, a responsible adult must drive you home. In general, you can resume driving the day after the procedure. Managing your condition Cardioversion is only one part of a comprehensive treatment program. It is also important for you to take your medications, make dietary changes, live a healthy lifestyle, keep your follow-up appointments, and be an active member of your treatment team. What is an arrhythmia? How do I know if I have an arrhythmia? What are the treatment options? What medication is available for arrhythmias? What is cardioversion? What are the ablation options? What implantable devices are used to treat arrhythmias? What if I do nothing? Is catheter ablation a good choice? Why choose cryoablation? How do I prepare for cryoablation? What is the experience of cryoablation patients? What can I do next? |