defibrilllation
TRANSCRIPT
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DEFIBRILLATION
D. SAI KUMAR
16.10.2014
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Cardiac Arrest Algorithm
D – danger
R – response
S – shout
A
B
C
–
–
–
airway
breathing
circulation
D – defibrillation
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DEFIBRILLATION
• Defibrillation is a process in which an
electronic device sends an electric shock
to the heart to stop an extremely rapid,
irregular heartbeat, and restore the normal
heart rhythm.
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Importance of EarlyDefibrillation
• To giveactionscardiac
the victim the best chancemust occur within the firstarrest:
of survival, 3moments of a
1)
2)
3)
Activation of the emergency medical services
Provision of CPR
Operation of a defibrillator
AHA guidelines 2010.Section 6.Electrical therapies
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Importance of EarlyDefibrillation
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• Claude Beck (1894-1971) was a pioneer of heart surgery,. He also developed ways to revive heart attack victims, including the defibrillator and CPR
• In 1947, Beck successfully defibrillated his first patient, a 14-year-old boy whose heart went into fibrillation after an operation.
• The defibrillator used on this patient was made by James Rand, a friend of Beck. It had silver paddles (the size of large tablespoons) that were used in open-chest situations..
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• Nine years later (1956) Paul Zoll used a more powerful unit to perform the first closed-chest defibrillation.
• In Belfast , ambulance-transported physicians first achieved pre-hospital defibrillation in 1966. Defibrillation by EMT’s (emergency medical technicians), without the presence of physicians, was first performed in Oregon , in 1969.
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• The electrical shock, by depolarizing all excitable myocardium and possibly by prolonging refractoriness, interrupts reentrant circuits and establishes electrical homogeneity, which terminates reentry
• Produces electrical silence or ASYSTOLE
• This allows pacemaking cells in heart to recover
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• Defibrillation is non synchronised delivery of energy during any phase of cardiac cycle
• Cardioversion is the delivery of energy synchronised with the large R waves of QRS complex
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Automated ExternalDefibrillators
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Manual Defibrillators
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Automated Implanted CardioverterDefibrillator (AICD)
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INDICATIONS
• As a rule, any tachycardia that produces hypotension, congestive heart failure, mental status changes, or angina and does not respond promptly to medical management should be terminated electrically.
• Very rapid ventricular rates in patients with atrial fibrillation and Wolff-Parkinson-White syndrome are often best treated by electrical cardioversion
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ENERGY REQUIREMENTS
• Selection of appropriate current will reduce the need for multiple shocks and limit the myocardial damage per shock
• The energy set too low will leave the heart in ventricular fibrillation and a shock with the energy set too high may leave the heart in asystole or AV block
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• The realtionship between bodysize and energy requirements for defibrillation has been under debate
• By the help of prospective out of hospital studies, the first shock energy for defibrillation was set at 200J in the mid 1980s
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Defibrillation waveforms
• Two broad categories : monophasic and biphasic
• Biphasic waveforms deliver current that flows in positive direction for a specified duration then reverses and flows in a negative direction for the remaining milliseconds of the electrical discharge
• Biphasic waveforms are more superior than monophasic …. Still under investigation and debate
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MONOPHASIC
* First-shock efficacy
360J54% - 63%*
360J77% - 91%*
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BIPHASIC
Up to 85% *
* First-shock efficacy
120-200J150-200J86%—98%*
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• Research has shown that repititive lower energy biphasic waveforms shocks (<200J) have equivalent or higher success for immediate termination of VF compared with monphasic waveform shocks that escalate the energy (200,300,400J) with successive shocks
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Pads ,Paddles, and Positions
• Often neglected topic
• Should be placed in a position which maximises current flow through myocardium
• Even with proper placement of paddles only 4% to 25% of deliverd current actually passes through heart
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• Recommended placement is termed either sternal- apex or anterior apex
• The sternal or anterior electrode is placed to the right of the upper part of the sternum below the clavicle
• The apex electrode is placed to the left of the nipple with the center of the electrode in the midaxillary line
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• Alteranative method is to place one paddle anteriorly over the left apex and the other posteriorly behind the heart in left infrascapular location
• Avoid placement directly over any implanted pacemaker or defibrillator
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Syncronised cardioversion
• Synchronisation prevents the unwanted induction of VF because it ensures that a shock hits during the absolute refractory period of the cardiac cycle
• Recommended in hemodynamically stable, widecomplex tachycardia requiring cardioversion, supraventricular tachycardia, atrial fibrillation and atrial flutter
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Synchronised Cardioversion
•
•
Not effective in junctional tachycardiamultifocal atrial tachycardia
or
Problems with synchronization • Time delay
• Some times shock not delivered
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IMPORTANT POINTS DURINGDEFIBRILLATION
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Important Points DuringDefibrillation
•
•
•
•
Hairy chest
Wet chest
Breasts
PatchesWrenn, K. The hazards of defibrillation through nitroglycerin
patches. Ann Emerg Med 1990; 19(11): 1327-8
AICD / pacemaker•
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Important Points DuringDefibrillation
Coupling agent•
– NO ARCING!!R. S. Hummel 3rd, J. P. Ornato, S. M. Weinberg and A. M. Clarke.Spark-generating properties of electrode gels used during defibrillation.A potential fire hazard. JAMA November 25, 1988; 260: 20
√
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Defibrillator Burn
• Correct use of coupling agent or defibrillatorpads will prevent burns
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Important Points DuringDefibrillation
• Paddle force
– 8kg in adult, 5kg in 1-8 year old using adult paddles
children when
• Paddle size– Minimum 150cm2, diameter 8-12cm
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Important Points DuringDefibrillation
• Paddle position
1.
2.
3.
4.
Sternal - apical
Biaxillary
Right or left upper back – apical
Antero-posterior especially in atrialarrhythmias
4 positions are equally effective in shock• Allsuccess
Deakin CD, Sado DM, Petley GW, Clewlow F. Is the orientationof the apical defibrillation paddle of importance during manualexternal defibrillation? Resuscitation 2003;56:15—8
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Important Points DuringDefibrillation
ALS Subcommittee 2010
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Important Points DuringDefibrillation
• Fire
May be ignited by sparks from poorly applieddefibrillator paddles in the presence of anoxygen-enriched atmosphere
Miller, P. H. Potential fire hazard in defibrillation. JAMA 1972;221(2): 192. Early report of fire hazardduring defibrillation
Fires from Defibrillation during Oxygen Administration. Hazard. Health Devices Jul1994;23(7):307-8
Robertshaw, H. and G. McAnulty. Ambient oxygen concentrations during simulated cardiopulmonaryresuscitation. Anaesthesia
1998;53(7): 634-7
Theodorou et al. Fire Attributable to a Defibrillation Attempt in a Neonate. Pediatrics 2003;112:677-679
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Important Points DuringDefibrillation
• One I clear, Two you clear, Threeclear
everybody
• Look back at monitor before shocking
• Paddles MUST be horizontal at all times!
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How to defibrillate ?stop look go
1.
2.
3.
4.
5.
6.
7.
8.
9.
Attach electrodes to patient’s chest
Turn defibrillator on – select leads
Analyse the rhythm ?shockable
Apply coupling agent or
Select energy level
Apply paddles to chest
Charge the paddles
The “Clear” chant
Check monitor again
pads to patient’s chest
10.Discharge shock and return paddles to machine
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If Flatline…
• Always double check that it IS a flatline
–
–
–
Check other leads
Check attachment of leads
Increase the size of rhythm to rule out fineventricular fibrillation
ALS Subcommittee 2010
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What is wrong with this picture?
ALS Subcommittee 2010
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References
1. American Heart Association CPR2010
Guidelines Nov
2. European Resuscitation Council Guidelines forResuscitation 2010
3. Braunwald’s textbook of cardiology 9th
edition