You are called to the Radiology Department to see a patient who has had sudden onset of dyspnea and hypotension after an injection for intravenous pyelography. Immediate therapy should include

(1) Rapid administration of intravenous fluids
(2) Diphenhydramine intravenously
(3) Epinephrine intravenously
(4) Intubation and controlled ventilation

Any or all of the answers may be correct.

All discussion is welcomed!!