What Is Cardioversion?

Cardiac cardioversion is also called electrical defibrillation, which refers to the use of a rated transient high voltage and strong current to pass through the heart during severe tachyarrhythmia, so that all or most of the myocardial cells are depolarized at the same time, causing the heart's short-term electrical activity to stop. The highest pace of pace (usually the sinoatrial node) then re-directs the treatment of the heart rhythm. At the same time, asynchronous cardioversion is also divided into intrathoracic defibrillation and extrathoracic defibrillation.

Cardioversion

Atrial fibrillation

1. arrhythmia caused by digitalis

2. Patients with significantly enlarged heart and patients with persistent AF for more than five years

3. Patients with a history of embolism or ineffective atrial thrombosis in the past three months

4. Sick sinus node syndrome

5. Patients who cannot recover sinus heart rate with antiarrhythmic drugs

6. Patients with slow heart rate or high or third degree AVB and SSS during atrial flutter

7. People who have difficulty maintaining sinus rhythm after cardioversion should not choose electric cardioversion

8.

Application of anticoagulant drugs

Intrathoracic Defibrillation Indications

Intrathoracic defibrillation

1. Cardiopulmonary bypass open heart surgery, thoracotomy, cardiac arrest due to various reasons (when intracardiac heart compression is ineffective) and arrhythmia.

2. If necessary, perform intrathoracic defibrillation.

To do this, place the two electrodes on the left and right sides of the heart after opening the chest. Charging (10J for adults for the first time, then it can be increased to 20J, the maximum is 30J, and children are charged for the first 5J, and then it can be increased to 10J, the maximum is 20J).

How cardiac defibrillation works

Energy of electric defibrillation: Defibrillation depends on selecting the proper energy to generate a sufficient current through the myocardium. The energy and current are too low, and the shock cannot terminate the arrhythmia; the energy and current are too high, which can cause myocardial injury and arrhythmia . There is no clear relationship between energy and weight during defibrillation in adults, and infants and young children have less energy in defibrillation than adults. If defibrillation fails for 3 consecutive times, CPR should be continued again, and brom benzylamine should be given, and the epinephrine dose should be increased before electrodefibrillation.

Application of AED