AHA ACLS Protocols are nationally accepted guidelines. However, ultimately you are under the control of your medical director. If he is suggesting giving a medication that is not consistent with those guidelines you have every right to question them to determine what rationale they are using to deviate from the accepted standard. Calcium choride is used to treat hyperkalemia, one of the frequent causes of PEA, in addition to treating hypocalcemia and calcium channel blocker toxicity.
Unless it's a total act of negligence in following your medical director's standing or voice orders, that's the stance I would take. Your medical director is responsible for reviewing any of their standing orders and making changes as necessary, usually on an annual basis.
It will always be a question of how, when or what we can be sued for. Did we administer Atropine exactly 5 minutes after the first dose or was it 5 minutes and 10 seconds, either way this is not negligence. If we administered 5 mg of Atropine however it would probably be considered negligence since it is 5 times or more the appropriate dose.
If you didn't have standing orders and had to use the radio to get an order for epinephrine in VF and your medical director denied the order where do you stand? Do you give it anyway since it is an accepted guideline or do you follow medical direction? Of course you follow medical direction and chart appropriately.