What is the typical initial intravenous dose of amiodarone for unstable wide-complex tachycardia with a pulse?

What is the typical initial intravenous dose of amiodarone for unstable wide-complex tachycardia with a pulse?

• A. Amiodarone 150 mg IV
• B. Amiodarone 25 mg IV
• C. Amiodarone 300 mg IV
• D. Amiodarone 1 g IV

Answer: (A)

In this situation, the drug is used to rapidly control a wide-complex tachycardia when the patient is unstable but has a pulse. The recommended initial intravenous dose is a 150 mg bolus infused over about 10 minutes. This delivers a quick antiarrhythmic effect while allowing the patient’s blood pressure to be monitored during administration. After the bolus, you typically start a continuous infusion (1 mg/min for 6 hours, then 0.5 mg/min for the next 18 hours) to maintain effect and reduce recurrence. Why not the other doses? A 300 mg IV bolus is reserved for pulseless VT or VF (no pulse). A 1 g IV dose is far too large for an initial bolus, and 25 mg IV is far too small to be effective. Remember, for unstable VT with a pulse, synchronized cardioversion is the immediate priority; amiodarone is used as a rapid pharmacologic option if needed.

In this situation, the drug is used to rapidly control a wide-complex tachycardia when the patient is unstable but has a pulse. The recommended initial intravenous dose is a 150 mg bolus infused over about 10 minutes. This delivers a quick antiarrhythmic effect while allowing the patient’s blood pressure to be monitored during administration. After the bolus, you typically start a continuous infusion (1 mg/min for 6 hours, then 0.5 mg/min for the next 18 hours) to maintain effect and reduce recurrence.

Why not the other doses? A 300 mg IV bolus is reserved for pulseless VT or VF (no pulse). A 1 g IV dose is far too large for an initial bolus, and 25 mg IV is far too small to be effective. Remember, for unstable VT with a pulse, synchronized cardioversion is the immediate priority; amiodarone is used as a rapid pharmacologic option if needed.