Well, lets be clear. It isn't a completely off the wall idea. Especially because it is preceded by epinephrine. It's just an "inelegant" and not so precise way (IMHO) of approaching the problem. But it is a potent catecholamine which is what is called for in that situation. Lots of ways to skin a cat I guess, and at the end of the day, if someone dies from whatever caused his PEA, a dopamine v. epi drip in this protocol probably wouldn't have made that big of a difference.
Thinking of the "H's and T's" I would agree that it probably doesn't matter in majority of the situations however with significant acidosis, tamponade, and massive PE I think Epi has an advantage.