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DEFIBRILLATOR
DEFINITION
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.
Defibrillation is a common treatment for life threatening cardiac dysrhythmias –
1. Ventricular fibrillation(VF)
2. Pulseless ventricular tachycardia (PVT).
NEED FOR A DEFIBRILATOR.
1. VF/pVT – asynchronous rapid ineffective contraction of the heart.
2. Early defibrillation – high chance of rhythm to revert back to normal.
DEFIBRILLATION WAVEFORMS AND ENERGY
LEVELS
, The energy settings are designed to provide the lowest effective
energy needed to terminate VF
Shock success -Termination of VF at 5 seconds after the shock
VF frequently recurs after successful shocks, but this recurrence
should not be equated with shock failure
Based on energy delivery, defibrillators are classified as:-
Monophasic Biphasic
Energy levels vary by type of device Monophasic – (360 J) Biphasic-
(120-200J)
.In pediatrics
Use of pediatric paddle Doses are 2-4 J/kg upto a maximum of 10J/kg with
subsequent shocks.
Synchronized Cardioversion
Tachyarrhythmias with pulse, but an unstable patient.
Energy selection is from 50-200 J.
ECG leads must be attached to the defibrillator, paddles/pads
attached and ‘sync’ button pressed.
Following synchronization, the device is charged and shock
delivered.
, • Patients usually require sedation/analgesics.
TYPES OF DEFIBRILLATOR
• 1. Direct current difibrillator
It delivers an electrical current of preset voltage to the heart through
paddles place on the chest wall.
2.AUTOMATED EXTERNAL DEFIBRILLATOR
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