Final answer:
The recommended energy dose for biphasic synchronized cardioversion of atrial fibrillation is 120-200 joules. This biphasic waveform is both effective and efficient at lower energy levels for restoring normal heart rhythms in cases of atrial fibrillation.
Step-by-step explanation:
The recommended energy dose for biphasic synchronized cardioversion of atrial fibrillation is typically 120-200 joules. A biphasic defibrillator delivers energy in two phases. The initial phase sends the electric current in one direction, then the second phase sends the current in the opposite direction. This biphasic waveform is more effective at lower energies than traditional monophasic defibrillators that deliver energy in one large shock. Therefore, the correct answer to the question is b) 120-200 joules. During open-heart surgery, much lower energies are used for defibrillation, which is why it's important to understand the specific requirements and recommendations for different clinical scenarios. For instance, a typical biphasic defibrillator applies a voltage to an 8.00 µF capacitor to store energy, and the amount of stored charge would be calculated accordingly, ensuring the safety and efficacy of the defibrillation.