As a medical professional with expertise in cardiology, I can provide you with information on the synchronization of cardioversion in the context of treating tachycardia. Cardioversion is a procedure used to restore the normal rhythm of the heart by delivering an electrical shock to the heart. When it comes to treating tachycardia, which is a rapid heart rate, there are two main types: supraventricular tachycardia (SVT) and ventricular tachycardia (VT).

For SVT, which originates above the ventricles, synchronized cardioversion is typically not necessary because the atria and ventricles are usually in synchrony. However, if the patient is hemodynamically unstable or if there is a risk of developing atrial fibrillation, synchronized cardioversion may be considered.

For VT, which originates in the ventricles, synchronized cardioversion is crucial. This is because the ventricles are not in synchrony with the atria, and delivering an unsynchronized shock could potentially worsen the situation. Synchronization ensures that the shock is delivered during the relative refractory period of the cardiac cycle, which is when the heart is less likely to initiate a ventricular arrhythmia.

In both cases, the procedure should be performed by trained medical personnel using appropriate equipment and following established protocols to ensure patient safety.

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For cases where electrical shock is needed, if the patient is unstable, and you can see a QRS-t complex use (LOW ENERGY) synchronized cardioversion. If the patient is pulseless, or if the patient is unstable and the defibrillator will not synchronize, use (HIGH ENERGY) unsynchronized cardioversion (defibrillation).read more >>