Cardiovert or defibrillate.
Don't hesitate when its warranted emergently.
know your acls algorithms
even use double sequential defibrillation if needed.
Augment efficacy of success with drugs if electricity by itself doesn't work..
Time and place for everything.
Please give the red stuff, blood when needed.
The only enemy is patient refusal and the obedience to religious practice like Jehovah Witnesses.
Whole blood is better than component replacement.
Deal with the resources you have.