Final answer:
The first dose of lidocaine in cardiac arrest is 1.0 to 1.5 mg/kg, with subsequent doses of 0.5 to 0.75 mg/kg at 5 to 10 minute intervals. Lidocaine assists in stabilizing heart rhythm, while defibrillation involves the use of electric current to help restart the heart's normal rhythm.
Step-by-step explanation:
The dose of lidocaine in cardiac arrest is 1.0 to 1.5 mg/kg for the first dose, and then 0.5 to 0.75 mg/kg for subsequent doses at intervals of 5 to 10 minutes. Lidocaine is used in the medical setting for its antiarrhythmic properties. During a cardiac arrest, it can be administered to help stabilize the heart's rhythm. However, the doses are determined by the patient's weight and specific medical condition, and should always be administered under the guidance of a medical professional. In cardiac arrest management, defibrillation is also crucial. It is a process where an electric current is passed through the heart using a defibrillator to help it resume a normal rhythm. The parameters for defibrillation during open-heart surgery, for instance, might involve determining the voltage needed to achieve the required current, as resistance and current levels are significant factors in the effectiveness of defibrillation.