aed means: defibrillator.
A defibrillator is a medical device that uses strong pulse current to pass through the heart to eliminate arrhythmia and restore sinus rhythm. It is an essential emergency equipment for various departments in the hospital. Defibrillation is one of the most important steps in performing cardiopulmonary resuscitation. The defibrillator is mainly composed of a monitoring part, a cardioversion machine, electrode plates, batteries and other parts.
An electrical cardioversion machine, also called a defibrillator, is the main equipment for performing electrical cardioversion. Equipped with electrode plates, most of them come in two pairs, large and small, the larger one is suitable for adults and the smaller one is suitable for children. During defibrillation and cardioversion, what acts on the heart is an instantaneous high-energy pulse, generally lasting 4 to 10 ms and electrical energy of 40 to 400 J (Joules).
The device used to defibrillate the heart is called a defibrillator, which can complete electrical cardioversion, that is, defibrillation. When patients develop severe tachyarrhythmias, such as atrial flutter, atrial fibrillation, supraventricular or ventricular tachycardia, etc., they often cause varying degrees of hemodynamic disorders. Especially when a patient develops ventricular fibrillation, cardiac ejection and blood circulation cease due to the inability of the ventricle to contract as a whole.
If timely rescue is not provided, the patient often dies due to prolonged brain deprivation of oxygen. For example, a defibrillator can control the current of a certain energy to pass through the heart, which can eliminate certain arrhythmias and return the heart rhythm to normal, so that patients with the above-mentioned heart diseases can be rescued and treated.
Contraindications:
1. Bradyarrhythmia, including sick sinus syndrome.
2. Arrhythmia caused by digitalis overdose (except ventricular fibrillation).
3. Atrial fibrillation, atrial flutter, and atrial tachycardia accompanied by high degree or complete conduction block.
4. Severe hypokalemia is not suitable for electrical cardioversion.
5. The left atrium is huge, the atrial fibrillation lasts for more than one year, and the ventricular rate is not fast for a long time.