30-03-2012, 04:56 PM
DEFIBRILLATOR
[attachment=19300]
NEED FOR A DEFIBRILLATOR
Ventricular fibrillation is far more dangerous, under this condition ventricles are unable to pump blood which can lead to the death of the patient within few minutes.
AC DEFIBRILLATION
Applying a brief(.25 to 1 sec) burst of 60 HZ ac at an intensity of around 6 A.
This application of an electrical shock to resynchronize the heart is sometimes called counter shock.
If the patient does not respond, the burst is repeated until defibrillation occurs. this method is known as ac defibrillation.
DC Defibrillation
In this method a capacitor is charged to a high dc voltage and then rapidly discharged.
The amount of energy discharged by the capacitor may range between 100 to 400joules with peak value of current 20A.
Dc defibrillator with synchronizer
Used to convert tachycardia to normal rhythm with the help of synchronizer
Synchronizer is to permit placement of discharge at right time(20 to 30 mSec after peak of R wave of patient).
Modern defibrillators include a provision for synchronizing discharge pulse with patients’s ECG.
Precautions in defibrillation Process
The paddles used in the procedure should not be placed:-
on a woman's breasts
over an internal pacemaker patients.
Before the paddle is used, a gel must be applied to the patient's skin
Operator should be careful not to touch electrodes during defibrillation.
[attachment=19300]
NEED FOR A DEFIBRILLATOR
Ventricular fibrillation is far more dangerous, under this condition ventricles are unable to pump blood which can lead to the death of the patient within few minutes.
AC DEFIBRILLATION
Applying a brief(.25 to 1 sec) burst of 60 HZ ac at an intensity of around 6 A.
This application of an electrical shock to resynchronize the heart is sometimes called counter shock.
If the patient does not respond, the burst is repeated until defibrillation occurs. this method is known as ac defibrillation.
DC Defibrillation
In this method a capacitor is charged to a high dc voltage and then rapidly discharged.
The amount of energy discharged by the capacitor may range between 100 to 400joules with peak value of current 20A.
Dc defibrillator with synchronizer
Used to convert tachycardia to normal rhythm with the help of synchronizer
Synchronizer is to permit placement of discharge at right time(20 to 30 mSec after peak of R wave of patient).
Modern defibrillators include a provision for synchronizing discharge pulse with patients’s ECG.
Precautions in defibrillation Process
The paddles used in the procedure should not be placed:-
on a woman's breasts
over an internal pacemaker patients.
Before the paddle is used, a gel must be applied to the patient's skin
Operator should be careful not to touch electrodes during defibrillation.