When do poison control centers recommend lipid rescue therapy?

Here is a report from a survey of medical directors of poison control centers:

The majority of PCC medical directors completed the survey (45 out of 57; 79 %). Of the 45 respondents, all felt that IFE therapy played a role in the acute overdose setting. Most PCCs (30 out of 45; 67 %) have a protocol for IFE therapy. In a scenario with “cardiac arrest” due to a single xenobiotic, directors stated that their center would “always” or “often” recommend IFE after overdose of bupivacaine (43 out of 45; 96 %), verapamil (36 out of 45; 80 %), amitriptyline (31 out of 45; 69 %), or an unknown xenobiotic (12 out of 45; 27 %). In a scenario with “shock” due to a single xenobiotic, directors stated that their PCC would “always” or “often” recommend IFE after overdose of bupivacaine (40 out of 45; 89 %), verapamil (28 out of 45; 62 %), amitriptyline (25 out of 45; 56 %), or an unknown xenobiotic (8 out of 45; 18 %). IFE therapy is being recommended by US PCCs; protocols and dosing regimens are nearly uniform. Most directors feel that IFE is safe but are more likely to recommend IFE in patients with cardiac arrest than in patients with severe hemodynamic compromise.