Aside from patient factors, a number of factors may influence the immediate success of cardioversion ... achieved with energies of 200-360 J (for monophasic shocks). A formal investigation ...

The mean energy used for cardioversion using the two services was 117 J and 242 J, respectively (P <0.0001); the new service used a biphasic defibrillator rather than a monophasic defibrillator.