automatic external defibrillation aaron j. katz, aemt-p, cic
TRANSCRIPT
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Automatic External Defibrillation
Aaron J. Katz, AEMT-P, CICwww.es26medic.net
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AHA Chain of Survival Early access Early CPR Early defibrillation Early ALS
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Cardiac electrophysiology SA Node
“dominant pacemaker” “Fires” 60-100 times per minute
Internodal pathways AV Node Bundle of HIS Left and right bundle branches Purkinje network
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Nonperfusing heart rhythms Ventricular tachycardia
(“VTACH”) Ventricular fibrillation (“VFIB”) Asystole Electromechanical dissociation
(EMD) Pulseless electrical activity (PEA)
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VTACH
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VFIB
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Asystole
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The bottom line All the above abnormal heart
rhythms can not produce a perfusing pulse
Pulseless VTACH and VFIB CAN be successfully converted to a perfusing rhythm using a defibrillator
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AED – the technology Very accurate computer enabling
recognition of lethal rhythms (“Analyze”)
Modern AED will talk Shocking mechanism (“Shock”) Automatic vs. semiautomatic
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Common AED errors Bad battery Patient moving AED applied to a responsive
patient
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Bad battery Use fully charged batteries
Depends on manufacturer Pay attention to AED warnings
about batteries Bad batteries are uncommon today COLD WEATHER
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Patient moving Causes inaccurate analysis Don’t touch the patient Stop the bus when analyzing!
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AED applied to a responsive patient AED applied to a responsive
patient with a rapid pulse AED may falsely interpret as
VTACH – and recommend shock Therefore: only apply AED to
an unresponsive pulseless patient
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Complications & solutions Patient has a pacemaker
Apply pads 5” from pacemaker AICD
No danger to EMT! Small amount of energy Apply pads 5” from pacemaker
Very hairy chest Shave the area Keep a disposable razor with your
defibrillator
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Integrating AED into CPR
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AED integration Arrive at the scene Assess responsiveness Stop CPR (EMTs or bystanders) Verify pulselessness & apnea Resume CPR until AED is ready
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*** NOTE WELL *** If you are the only rescuer, DO
NOT DO CPR UNTIL THE PATIENT IS DEFIBRILLATED
The most important life saving action for the cardiac arrest patient is defibrillation
Therefore, PREPARE THE DEFIBRILLATOR!
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AED integration – cont’d Prepare for defibrillation:
Bare the chest Power on AED Remove nitro paste/patches Apply pads to the chest Look at the pads, they show you how
Right: right of sternum under clavicle Left: left ribs
Top of pad should 2-3” below armpit Apply them smoothly
STOP CPR
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AED integration – cont’d Make sure no one is touching the
patient Either press analyze or “Analyze”
may start on its own AED may tell you “analyzing – do not
touch the patient” Results…
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AED integration – cont’d Analysis at any time will result in either: Shock advised
AED will charge and tell you to clear the patient and press shock
First shock within 90 seconds of AED availability No shock advised
Patient may have a pulse Patient has a nonshockable rhythm
Asystole, EMD/PEA
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Shocks recommended Initial analyze/shock up to 3 times
Three “stacked analyze/shocks” Check pulse… Pulse absent?
CPR for one minute check pulse, no pulse?
Three stacked analyze/shocks We’re now up to 6 shocks
Check pulse
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Decision time Short transport time?
Transport Continue CPR
Long transport time/ALS close? 3 stacked analyze/shocks 1 minute CPR Check pulse Repeat sequence until hospital or until
No Shock Advised
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No shock advised CPR Transport
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Pulse Present? Assess Vital Signs Support ABCs Immediate Transport
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AED and Children Do not use the AED in pediatric
cardiac arrest unless: AED is equipped for and FDA
approved for use on children less than 8 years of age
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Hypothermic patients & AED Limit shocks to 3 After 3 shocks, if needed, CPR,
rewarming and transport