Final answer:
The optimal dose for adult defibrillation using a manual external defibrillator is typically 200 joules (J). Defibrillation principles entail calculating charge, voltage, and resistance to ensure correct energy delivery, which can be life-saving in cases of ventricular fibrillation.
Step-by-step explanation:
The optimal dose for defibrillation of an adult patient using a manual external defibrillator is generally considered to be 200 joules (J), which corresponds to option C in the question. Although the energy settings can vary slightly depending on the defibrillator manufacturer's specifications, many standard adult defibrillation protocols recommend starting with 200 J. It's also important to follow the specific guidelines and protocols of the setting in which you work, as they can have tailored instructions based on the equipment available and the patient population served.
In relation to the principles behind defibrillation, when a heart defibrillator passes 10.0 A through a patient's torso for 5.00 ms in an attempt to restore normal beating, 50 C of charge passed through the patient. If 500 J of energy was dissipated, we can calculate that the applied voltage was 10,000 V based on the relationship between energy (J), charge (C), and voltage (V); energy equals charge times voltage (E = QV). Additionally, if the path's resistance was 500 ohms and given the current, the voltage we calculate would be necessary to achieve the desired current based on Ohm's Law (V = IR). Furthermore, to determine the temperature increase in the affected tissue mass, we can use the concept of the specific heat capacity.