The method of electrical defibrillation is more widely used. The initial defibrillators used industrial alternating current for defibrillation directly, and these defibrillators would always cause injury or death due to electric shock. Therefore, except for defibrillation (ventricular fibrillation) during heart surgery, which is still done using alternating current, defibrillation is generally done using direct current.

Electrical defibrillation is a method of stopping ventricular fibrillation by shocking the heart with a certain amount of electrical current. If the chest has been opened, the electrode plates can be placed directly on the inner wall of the atrium for high-voltage shock, known as intracardiac defibrillation. Placing the electrode plates on the sternum for high-voltage shock is known as extracardiac defibrillation.

The position should be decided according to the posture of the defibrillation recipient.

Lateral position: one electrode plate is placed at the intersection of the fifth rib on the left side and the midaxillary line, and the other electrode plate is placed at the second rib on the right edge of the scapula.

Anteroposterior position: one electrode plate is placed at the second rib between the right edge of the scapula, and the other electrode plate is placed below the left scapula.

The method of clearing arrhythmias and restoring sinus rhythm by using a strong surge current according to the heart is called defibrillation or cardioversion. Both pacing and defibrillation are methods of treating arrhythmias using external electrical current, and both are modern methods of treating arrhythmias.

The difference between pacing and defibrillation is that the latter uses a single high-energy pulse for defibrillation, generally lasting 4-10 Ms, with electromagnetic energy within 40-400 J (Joules). The equipment used for defibrillation is called a defibrillator, which can perform defibrillation, that is, defibrillation.

When a patient develops a severe and rapid arrhythmia, such as atrial flutter, atrial fibrillation, supraventricular or ventricular tachycardia, it usually leads to varying degrees of blood propulsion obstruction. Especially when the patient has ventricular fibrillation, because the atrium has no overall contraction ability, cardiac ejection and the circulatory system stop, and if not treated immediately, it often leads to death of the patient due to prolonged cerebral hypoxia.

If a defibrillator is chosen, a certain amount of electrical current with controlled kinetic energy, according to the heart, can clear some arrhythmias and restore the heart rate, thereby enabling the patient with heart disease to receive treatment and cure.