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
• 2. Automated External Defibrillator (AED)
• 3. Automated implantable cardioverter defibrillator
1.DIRECT CURRENT DEFIBRILLATOR
It delivers an electrical current of preset voltage to the heart through
paddles place on the chest wall.
2.AUTOMATED EXTERNAL 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
• 2. Automated External Defibrillator (AED)
• 3. Automated implantable cardioverter defibrillator
1.DIRECT CURRENT DEFIBRILLATOR
It delivers an electrical current of preset voltage to the heart through
paddles place on the chest wall.
2.AUTOMATED EXTERNAL DEFIBRILLATOR
