While Ellis Grey is being treated for SVTs by Cristina, the rhythm shown is more consistent with VT (ventricular tachycardia). Furthermore, VT would not be effectively treated using carotid massage.
Every episode of the show is named after a famous song. "Wishin' and Hopin'" is a song by Dusty Springfield.
The situation with a toxic patient closely resembles an actual event from the 90's in Riverside Hospital.