Antiarrhythmics used to treat VF or VT include which option?

Antiarrhythmics used to treat VF or VT include which option?

• A. Amiodarone or Lidocaine
• B. Adenosine or Digoxin
• C. Calcium Channel Blocker
• D. Beta Blocker

Answer: (A)

For ventricular fibrillation or pulseless ventricular tachycardia, the antiarrhythmic drugs used in resuscitation are amiodarone or lidocaine. Amiodarone is a broad-spectrum antiarrhythmic that prolongs the cardiac action potential and refractoriness, helping to stabilize chaotic ventricular activity and reduce the chance of recurrence after defibrillation. It is considered the first-line option in modern resuscitation guidelines because it remains effective in ischemic tissue and during ongoing shock sequences. Lidocaine serves as an alternative when amiodarone is unavailable or not tolerated, particularly for ischemia-driven VT/VF, and can help suppress ventricular excitability when defibrillation alone isn’t sufficient. The other drugs aren’t used for acute treatment of VF or VT. Adenosine targets the AV node to treat certain supraventricular tachycardias and can be dangerous if given during VT. Digoxin has chronotropic effects used for rate control in atrial fibrillation or heart failure, not for acute termination of VF/VT. Calcium channel blockers and beta blockers are not appropriate for pulseless VT/VF management and can worsen hemodynamics in the resuscitation setting, though they may have roles in other arrhythmias or stable patients outside this acute context.

For ventricular fibrillation or pulseless ventricular tachycardia, the antiarrhythmic drugs used in resuscitation are amiodarone or lidocaine. Amiodarone is a broad-spectrum antiarrhythmic that prolongs the cardiac action potential and refractoriness, helping to stabilize chaotic ventricular activity and reduce the chance of recurrence after defibrillation. It is considered the first-line option in modern resuscitation guidelines because it remains effective in ischemic tissue and during ongoing shock sequences. Lidocaine serves as an alternative when amiodarone is unavailable or not tolerated, particularly for ischemia-driven VT/VF, and can help suppress ventricular excitability when defibrillation alone isn’t sufficient.

The other drugs aren’t used for acute treatment of VF or VT. Adenosine targets the AV node to treat certain supraventricular tachycardias and can be dangerous if given during VT. Digoxin has chronotropic effects used for rate control in atrial fibrillation or heart failure, not for acute termination of VF/VT. Calcium channel blockers and beta blockers are not appropriate for pulseless VT/VF management and can worsen hemodynamics in the resuscitation setting, though they may have roles in other arrhythmias or stable patients outside this acute context.