Final answer:
The initial dose of amiodarone for cardiac arrest is 300 mg, followed by a possible additional 150 mg. For defibrillation during surgery with a resistance of 500 ohms and a required current of 10.0 mA, a voltage of 5 volts is needed.
Step-by-step explanation:
The cardiac arrest dosing of amiodarone is a 300 mg bolus, then consider a one-time additional dose of 150 mg in 3 to 5 minutes. When using a defibrillator during open-heart surgery to address cardiac arrest, an important calculation involves the voltage needed to achieve a 10.0-mA current given a resistance path of 500 ohms. According to Ohm's law, which states that Voltage (V) equals Current (I) times Resistance (R), the required voltage can be found by multiplying the current needed by the resistance of the path. So for a 10.0-mA (or 0.01 A) current and a resistance of 500 ohms, the voltage should be 0.01 A × 500 Ω, which equals 5 volts.