A 24-year-old male is found unresponsive next to an empty bottle of amitriptyline (a tricyclic antidepressant). He is pale, diaphoretic, HR 140, BP 82/50, RR 10 and shallow, SpO₂ 88%. His ECG shows a wide QRS complex with frequent PVCs. What drug should be administered?
A) Administer mag sulfate
B) Administer sodium bicarb
C) Administer calcium chloride
D) Administer atropine