Final answer:
Amiodarone and Lidocaine are two extensively studied anti-arrhythmic drugs for prolonged pulseless VT and VF. Amiodarone is believed to be more effective for increasing the rate of ROSC with electrical defibrillation in patients with pulseless VT or VF. However, if amiodarone is not available, lidocaine can be considered as an alternative since it is more widely available in veterinary practices.
Step-by-step explanation:
Amiodarone and Lidocaine are two extensively studied anti-arrhythmic drugs for prolonged pulseless VT and VF. Amiodarone is believed to be more effective for increasing the rate of ROSC with electrical defibrillation in patients with pulseless VT or VF. However, if amiodarone is not available, lidocaine can be considered as an alternative since it is more widely available in veterinary practices. The specific veterinary benefits of amiodarone over lidocaine have not been established.