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Illustration: Jason Lee

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At its best, the beastly affection is a adaptable machine. Aback the hydraulics assignment as they should, an electric accustomed rhythmically moves claret through the heart’s four chambers. Electric impulses biking forth specialized fibers and afresh bound from corpuscle to cell, causing the beef fibers to arrangement and relax as consistently as a additional duke active about a alarm face. Aback they contract, the beef fibers actualize high-pressure regions that beforehand accessible the heart’s valves. Claret pours out of one alcove into another, and aloof avant-garde of the claret campaign the current, absolutely agitative the appropriate fibers and beef in sequence.

But aback things go wrong, that accustomed can abet absurd chaos. If a affection is stricken by ventricular fibrillation—a common blazon of cardiac arrest—then its once-orderly advice devolves into a bead of impulses. These impulses biking through the affection as little wavelets, causing unsynchronized abbreviating and absolution of the beef fibers in the ventricles, the two lower accommodation of the heart. Afterwards synchronization, claret breeze ceases; fatigued of oxygen, added organs rapidly activate to fail. Within 10 minutes, the victim will about absolutely die.

About division of all deaths in the developed apple can be attributed to cardiac arrest—an alarming figure, and one that now has a adventitious to drop, in no baby allotment because of the automatic alien defibrillator. AEDs are advised to shock a affection that’s in ventricular fibrillation aback into a advantageous rhythm. The accessory is now so accessible to use that alike an green eyewitness can administrate this time-critical and awful able medical procedure. AEDs, which fit into a case the admeasurement of a cafeteria box [see “Simply Saved”], can now be begin in hundreds of bags of accessible places, including appointment buildings, busline hubs, and gyms; they’ve additionally been installed in badge cars, in schools, and alike on the International Space Station. As the amount continues to drop—units can advertise for as little as US $1000—some experts are advancement bodies at aerial accident for cardiac arrest to accumulate an AED in their homes, aloof in case.

The AED’s boundless broadcasting represents one of the greatest engineering success belief of the aftermost few decades. In aloof 20 years, improvements in defibrillator design—in the adeptness of the waveform that delivers the electric shock, the way that the unit’s activity is stored and delivered, and the AED’s all-embracing affluence of use—have fabricated it so that a believer can accomplish it with little added than a quick tutorial.

You’re affair with a middle-aged aide who aback slumps over. You accept no abstraction what’s amiss with him, but cardiac arrest seems likely. Fortunately, you’ve had basal training in how to acknowledge to an emergency, so you breeze out of your antecedent accompaniment of shock and alarm for emergency medical assistance.

On average, the delay for an ambulance in busy areas of the United States is about 11 minutes. From your first-aid training you apperceive that a cardiac-arrest victim’s adventitious of adaptation drops about 10 percent with every casual minute, which doesn’t augur able-bodied for your coworker. You bethink seeing an AED blind on a coffer nearby, and you birr off to retrieve it. Defibrillator in hand, you attempt to accumulate air-conditioned as you try to anamnesis how this aberrant accessory works. You’re beneath immense time burden in an alien bearings area every additional counts.

Luckily for your colleague, the blow of your accomplishments couldn’t be added straightforward. From the moment you accessible the AED’s blithely black box, audio instructions alert you with simple commands. First, they acquaint you to abode two adhering electrode pads on your coworker’s bald , afterwards the diagrams on the pad wrappers. The defibrillator’s congenital electrocardiograph automatically detects and analyzes the accompaniment of the patient’s heartbeat, and its software board whether to administrate a shock. Your colleague’s affection is absolutely in ventricular fibrillation, so the AED asks you to accept the commitment of a tailored access of electric current. “Push the on,” announces a close articulation appearing from the box. There’s alone one on, so you columnist it. Your coworker’s anatomy all-overs a little, and that may be all that’s bare to restore a accustomed accent to his heart. If not, the box prompts you to beforehand the on afresh afterwards some time. Thanks to your quick actions, your aide is saved.

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Meanwhile, what’s accident central the AED is a abstruse marvel. The accessory performs two capital functions. First, it needs to admit the baleful awry accent of ventricular fibrillation. Second, it needs to bear a 100-kilowatt shock to the heart. This blow allows the affection to restart its accustomed rhythm, array of like a Ctrl-Alt-Del for the organ. If the shock is delivered in the aboriginal minute of ventricular fibrillation, in added than 90 percent of cases the affection will achieve a accustomed arrangement of electric signals, and the abiding contractions will return. It took decades of accurate engineering to beforehand a accessory that could accomplish those two functions reliably, accept a affiliated shelf life, and be both safe and accessible to use.

The inherent abandon of an electric shock stands in abrupt adverse to its abeyant ameliorative effect. In fact, the agent of electrical defibrillation can be traced to both beheading and efforts to amaze the United States in the aboriginal 1900s.

Engineers and medically absorbed experimenters had affiliated empiric and tinkered with the abeyant of abating activity with electricity. Some of the aboriginal committed assay into the mechanisms of electric shock, however, emerged from absolutely the adverse effect—electricity’s adeptness to kill. Aback General Electric, the aggregation cofounded by Thomas Edison, switched from direct-current to alternating-current chiral in the aboriginal 1900s, linemen began to die from adventitious electro­cution. In response, GE adjourned assay at several universities to abstraction what fabricated electric accustomed lethal. Two electrical engineering professors, William Kouwenhoven and Guy Knickerbocker, at Johns Hopkins University, in Baltimore, activated the abnormality by abominable devious dogs to death. Serendipitously, they noticed that a additional ac shock could sometimes accompany an electrocuted dog aback to life.

Photo: CARDIAC SCIENCE

Simply Saved: The automatic alien defibrillator, which shocks hearts out of cardiac arrest, hides its adult engineering abaft a simple and animated exterior.

Kouwenhoven and Knickerbocker’s ascertainment was best up by a beat cardiac surgeon, Claude Beck, at the University Hospitals of Cleveland. He began carrying ac anon to the apparent hearts of animals he had put into ventricular fibrillation. Beck ability accept affiliated absolutely with his beastly experiments, except that in 1947 a 14-year-old patient’s affection chock-full during surgery. Out of desperation, Beck ordered that his assay assemblage be brought up from the hospital’s basement. This simple defibrillator consisted of a agent to abstract the accommodating from the 110-volt ac coffer supply, a capricious resistor to absolute the accustomed to a heart-safe value, and two metal tablespoons with board handles to bear the blow to the apparent affection [see “Saved by a Spoon”].

The aboriginal shock failed, so Beck administered a second. That brought the accommodating aback to life, and the accident fabricated civic news. But because so little was accustomed about why the address formed or how to beforehand it, these awkward ac systems persisted for several years. Recipients of closed- ac defibrillation tended to ache abhorrent ancillary furnishings from the ample abiding currents, including burst ribs and accident to the affection ­muscle—if they were adored at all.

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Unknown to Beck and his colleagues in America, board in Europe and Russia were far avant-garde of them in beastly assay and were alpha to use a audible pulse, or dc, defibrillation. In the 1890s, Jean-Louis Prévost and Frederic Batelli, two physiologists at the University of Geneva, active animals with a capacitor acquittal delivered anon to the heart.

Decades later, one of their alum students, Lina Schtern, confused to the Soviet Union and affiliated to clarify the ­technique—that is, until she accustomed a afterlife book during a crackdown on intellectuals beneath Joseph Stalin. She was eventually pardoned by the absolutist himself, who (according to accustomed rumor) believed that she could accompany bodies aback from the dead.

In Moscow, at the aiguille of Apple War II, a adolescent apprentice of Schtern’s called Naum Gurvitch fabricated accelerated advances in defibrillation. Gurvitch was the aboriginal to beforehand application a biphasic waveform—a ­sizable absolute blow followed by a baby nega­tive pulse—to bear the shock. That acumen accepted to be one of the best analytical abstruse advances in the development of defibrillators. He arise a abbreviate commodity on his use of biphasic shocks to alleviate animals, but the abstraction didn’t absolutely booty authority until a Lithuanian-born American cardiologist, Bernard Lown, congenital a dc defibrillator. Lown acclimated his defibrillator to amusement patients adversity from ventricular tachycardia, a beneath apocalyptic arrhythmia that additionally responds to shocks. He afterwards had defibrillators congenital application Gurvitch’s schematics, but best U.S. advisers still accredit to Gurvitch’s beforehand assay as the Lown waveform.

The amount basic of a defibrillator has consistently been the capacitor, which food the activity bare for the shock. The aboriginal “portable” defibrillator, congenital in 1965, advised 70 kilograms afterwards batteries and was advised to be acquainted into an ambulance’s amateur battery. The accessory consisted of a ample Mylar-film capacitor able of autumn a 4000-V, 400-joule charge, a charging ambit (to catechumen the 12 V from the car array to 4000 V), a gas acquittal relay, and a ample inductor. Aback the capacitor discharged, the accustomed anesthetized through the inductor to abate its aiguille current, which, at up to 80 amperes, ability accident the affection instead of defibrillating it.

This aboriginal accessory had a on that controlled the gas acquittal relay; aback pressed, it completed a ambit and delivered a able audible beating from the capacitor through the inductor to the patient. The accustomed was transmitted through paddles the admeasurement of accouterment band placed on the so that the ambassador could get a acceptable grip. Because dry bark is an insulator, a rescuer had to administrate acceptable burden to affected its impedance. (The Johns Hopkins engineers Kouwenhoven and Knickerbocker noticed that this abundant burden additionally acquired a patient’s claret burden to spike. That’s how the -compression address now acclimated in cardiopulmonary resuscitation, or CPR, was invented. [See the online sidebar, “Rethinking CPR.”])

These defibrillators appropriate two accomplished operators: accession to columnist the paddles adjoin the and accession abroad to beforehand the on. One of the operators had to aboriginal access and adapt the electrocardiogram, or EKG. Afresh accession had to aish the leads from the EKG because the shock would other­wise abort its electronics.

The accessory wasn’t absolutely portable—even afterwards some architecture modifications, the beefy units advised amid 20 and 40 kg. There was additionally no aegis to accumulate the accessory from actuality acclimated in the amiss situation—say, afield abominable an above alone who ability absolutely be experiencing a access or a amazement spell.

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Two above advances cut the activity claim for defibrillation in half, from 400 J to 200 J, while decidedly abbreviation the abortion rate. The first, which took authority in the 1980s, was to annihilate the beefy paddles.

Unlike the electrons that backpack accustomed through wires, ­current in the anatomy is agitated by ions, chiefly sodium, potassium, and chlorine. Aback the electric abeyant beyond a cardiac cell’s blur alcove a assertive threshold, ion channels open, acceptance ions to access the corpuscle and activate beef contraction. In abode of the defibrillator’s paddles, biomedical engineers developed adjustable adhering patches coated with a metal ­chloride gel (such as tin chloride) to alteration accustomed from the affairs to the body. Each application has a altered polarity: on the patch with a nega­tive polarity, for example, an electron from the wire replaces a abrogating ion from the chloride in the gel, which frees the chloride ion to canyon through the bark and backpack accustomed into the body.

The patches bargain the archetypal acquaintance attrition from about 150 ohms to about 75 ohms, which accustomed for abate voltages. The lower voltages meant that defibrillators could be congenital with higher-­density electrolytic capacitors and abate semiconductor switches. Thanks to the adhering patches, the defibrillation operation now appropriate alone one person.

However, these gelled patches sometimes broiled out, so paramedics had to assay their electrodes every day. Two of us (Karl Kroll and Byron Gilman) had the abstraction of packaging the two pads calm with a partially conductive absolution liner amid them. Now the AED was able to canyon a baby shock amid the patches to anticipate them from accepting broiled out.

The added big beforehand was to about-face to the avant-garde ­biphasic waveform, which, in accession to its college efficacy, additionally reduces the ability requirements for defibrillation [see “Wave Sculpting”]. One of us (Mark W. Kroll) was the aboriginal to broadcast a quantitative description of the biphasic waveform, in 1994. In essence, the aboriginal appearance of the shock accuse the corpuscle membranes; the ­second phase, area the accustomed reverses, allotment the corpuscle membranes to aught voltage. We still don’t apperceive absolutely why the biphasic waveform is so effective, and we accept yet to apprentice of any analogues in the blow of biology. One purpose of the additional appearance appears to be to acquittal and alleviate the blasted-open membranes of beef aing to the electrodes (which accept the best acute current) and to acquittal beef that are alone hardly charged. Mark coined the appellation “burping” (based on the abstraction of a mother burping balance gas from an baby afterwards agriculture it) to alarm this aberrant phenomenon.

Because biphasic waveforms crave beneath ability than their precursors, the admeasurement of a defibrillator’s apparatus could additionally shrink. The abundant metal blur capacitor was replaced by a failing coffer of aluminum electrolytic capacitors affiliated in series, and the abundant adamant inductor was alone altogether, as it was no best bare to abate the aiguille currents.

Source: Mark W. Kroll

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Wave Sculpting: From the 1890s, experimenters defibrillated with some success. Naum Gurvitch’s waveform, however, became the arch to the avant-garde AED.

With the accompanying abridgement in aiguille voltages from 4000 V to beneath than 2000 V, the gas arc broadcast was dropped; switching is now performed by avant-garde bunched insulated-gate bipolar transistors. These are configured in a archetypal H-bridge circuit, the basic that allows motor controllers to run avant-garde or astern [see “Tender Loving Shock”]. Depending on which two of its four switches are closed, the ambit can bear a accustomed or reversed-polarity voltage. Two switches are angry on for 5 to 8 milli­seconds to bear the capital shock. Immediately afterward, the two actual switches are angry on to bear the balance capacitor allegation and accomplish the burping activity of the additional phase.

Taken together, these changes bargain the weight of the assemblage from 40 kg to 1.5 kg and fabricated it safer to operate. Further advances in the capacitor, battery, and high-voltage semi­conductors should eventually abate the admeasurement of the AED to that of a accouter of arena cards.

The aing claiming was to architecture the accuracy of the machine. The defibrillator had to amount out, on its own, aback to bear a shock.

The baby is best accessible during a aeon accustomed as the T wave. The T beachcomber occurs aloof as the affection is alpha to relax afterwards abbreviating and lasts about 100 ms, or about one-tenth of a heartbeat. A shock administered to a nonfibrillating affection during the T beachcomber could potentially abet fibrillation. If the AED’s electrode patches are positioned far from the target, such as on the belly, the accustomed that assuredly alcove the affection could be sufficient—if it arrives during that accessible period—to abet fibrillation, but it may not be able abundant to afresh defibrillate and disengage its own damage. To accommodate a assay on such situations, AED designs began accumulation an assay arrangement that checks for a pulse.

Recall that collapsed aide of yours. Already the AED is angry on and you’ve absorbed the electrode patches, the device’s aboriginal assignment is to admit the EKG arresting to see if ventricular fibrillation has occurred. The arrangement starts by carrying a low-­voltage, about ephemeral 30-kilohertz arresting through the two electrodes. That activity measures the impedance to verify a acceptable acquaintance on the body.

When you get an EKG at the hospital or in a clinic, your appropriate leg is acclimated as the ground, or common, electrode from which to admeasurement the tiny voltage differences that accomplish up the EKG. However, as the adroit architect will notice, an AED has alone two electrodes—there is no arena electrode. So the boilerplate voltage at these two electrodes is acclimated as the reference.

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The two-electrode arresting is afresh fed into a actual aerial ­common-mode-rejection amplifier, which differentiates amid the two signals by abnegation the voltages accepted to both. (Additional complicated chip protects this microvolt-­sensitive amplifier from the 2000-V shock—20 actor times the EKG ­voltage—delivered to those aforementioned electrodes acclimated for the sensing.) A sophisticated aiguille detector afresh analyzes the arresting in chase of a heartbeat. A accustomed baby is about a aeon of blood-pressure increases and decreases, which appearance up on the cardiogram as bright voltage peaks followed by analogously collapsed regions. In ventricular fibrillation, those audible peaks disappear, and instead a noisy, blowzy arresting will arise on the cardiogram. The aiguille detector interprets this blatant arresting as a alternation of rapid, about spaced heartbeats. The AED makes its antecedent analytic accommodation by barometer the affection rate. If this amount is added than 150 beats per ­minute (2.75 hertz), the defibrillation-detection algorithm presumes that ventricular fibrillation has occurred, and the accessory will advertise that the rescuer should administrate a shock.

However, dozens of attenuate issues can attenuate this process. For example, if a accommodating has an centralized pacemaker, that device’s higher-amplitude 60-beats-per-minute pulses could abash the AED’s aiguille detector into blank the 100â¿¿­microvolt ventricular fibrillation signal, so no shock would be administered. The adverse botheration can action if the accommodating has atrial fibrillation, a adequately amiable accent agitation in which the affection still perceivably beats but at aberrant intervals. This action can accomplish aerial affection rates, potentially causing the AED to alarm for an inappropriate shock.

To accord with these abashing rhythms and added interferences, the defibrillation-detection algorithm performs a simple ashen analysis. What follows is one archetype of such an algorithm; abounding aggressive approaches exist. If too abundant of the arresting occurs at a college abundance (30 to 100 Hz), afresh babble contamination, conceivably from an ac ability band or some skele­tal beef contractions, is doubtable and the algorithm will move abroad from diagnosing ventricular fibrillation. To handle the achievability of atrial fibrillation, the algorithm calculates the boilerplate acquired of the EKG voltage. If the boilerplate exceeds a analytical threshold, that tends to aphorism out atrial fibrillation. The EKG of a affection in atrial fibrillation has a college admeasurement of collapsed regions of aught voltage, and accordingly a aught derivative.

Those tests and added are performed during a three-second window, arch to a acting diagnosis. The action is afresh again to aftermath three diagnoses. Alone if two or all three analyses announce ventricular fibrillation will the shock be authorized.

The single-on architecture was accession key advance over beforehand AEDs. An green abettor who’s adverse a panic-filled, basic accommodation should not be confronted with assorted ons and accepted to bound amount out which on turns the assemblage on and which one administers the shock. The beforehand abstraction of one of us (Karl) was to accept the accessory about-face on automatically and alpha speaking aback its lid is opened.

Every time an AED is used, whether or not a shock is delivered, it sows the seeds for its own improvement. Every EKG is stored in semiconductor anamnesis for afterwards downloading to a computer at the emergency-response headquarters, from which abstracts can be beatific aback to the AED’s manufacturers. Advisers use this ample database of diagnoses to beforehand and clarify approaching algorithms. Linear methods (such as fast Fourier transforms) and ­nonlinear techniques (such as neural networks) may anon beforehand the apprehension of ventricular fibrillation. These adult signal-processing techniques are actuality acquainted up to accomplish the actual diagnosis, alike in the attendance of electromagnetic interference, beef noise, and abnormal arrhythmias that ability be afflictive the heart. Today’s algorithms may able-bodied be supplanted in a few years by added avant-garde ones that will almost resemble the adjustment declared here.

Thanks to the advances in the AED, the anemic articulation in the alternation is now CPR. The archetypal agreement is for a rescuer to administrate chiral compressions and mouth-to-mouth ventilations until accession brings an AED or an ambulance arrives. This keeps claret oxygenated and affective to apprehend academician death. Surprisingly, contempo studies accept apparent that the compressions additionally move some air through the lungs, at atomic for a few account afterwards the access of cardiac arrest. As a result, mouth-to-mouth breath is now actuality alone from those protocols.

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However, alike accomplished responders will annoy afterwards carrying compressions for added than a minute. Advisers at Minneapolis-based Galvani, a aggregation founded by Mark W. Kroll and headed by Gilman, are now exploring an automatic electrical anatomy of CPR. Application the aforementioned defibrillation patches, this address relies on complex, lower-voltage waveforms (100 to 200 V) that are delivered already or alert per additional and account able constrictions. The constrictions arise to move claret as finer as would compressions performed by a accomplished beastly rescuer.

If this assay pans out, in the approaching a eyewitness charge alone attach the patches and the AED will do the rest, assuming electrical CPR for a minute or two, followed by a affected defibrillation shock if it’s needed. Indeed, we may now be on the bend of a beachcomber of medical automation that allows accustomed individu­als to arbitrate constructively aback added people’s lives are at stake. The AED, we think, serves as an important case abstraction for how to fit adult life-saving medical electronics into bloom affliction and rehabilitation alfresco of hospitals. Advances in carriageable and easy-to-use equipment, home-based therapy, alien bloom monitoring, and telemedicine may one day acquiesce patients to abstain long, expensive, and emotionally clarification hospital visits.

As their adeptness and beyond abide to grow, AEDs, we hope, will pave the way for a approaching area emergency bloom affliction is accessible to all.

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