Final answer:
Cardioversion energy doses for unstable atrial fibrillation typically start at 120-200 Joules for biphasic defibrillators and 200-360 Joules for monophasic defibrillators, with possible increments if initial shocks are not successful.
Step-by-step explanation:
The question pertains to the appropriate energy doses used in cardioversion for patients with unstable atrial fibrillation. Cardioversion is a medical procedure where a controlled electric shock is delivered to the heart to restore a normal rhythm in cases of arrhythmia. It's important to note that energy doses can vary based on the device used and specific patient factors. However, typical initial energy doses for biphasic defibrillators start at 120-200 Joules, while for monophasic defibrillators they typically start at 200-360 Joules. If the first shock is unsuccessful, the energy can be escalated in subsequent shocks. Patients are usually under short-acting anesthesia or sedatives during this procedure. Additionally, depending on the individual circumstances, patients may be prescribed blood thinners to reduce the risk of stroke and other complications.