Air Methods Critical Care Practice Exam

The second dose of amiodarone for adult cardiac arrest, following the initial administration, is typically 150 mg. This dosing protocol is designed for use during advanced life support (ALS) procedures, specifically for cases of ventricular fibrillation (VF) or pulseless ventricular tachycardia (VT) that are refractory to initial defibrillation attempts.

The rationale behind administering a second dose of 150 mg is based on clinical guidelines that recommend this amount to further stabilize the patient's cardiac rhythm without overwhelming the system with excessive medication. Amiodarone works by prolonging the action potential duration and refractory period in myocardial tissue, which can help restore normal heart rhythms after a cardiac event.

This clear guideline is crucial in managing cardiac arrest situations effectively, as too high a dose could lead to adverse effects and complications. Hence, the inclusion of a standardized second dose allows for a balance between efficacy and safety during resuscitation efforts.