A 67-year-old, 75-kg woman with chronic atrial fibrillation must undergo emergency laparotomy for a perforated duodenal ulcer. She had been taking digoxin and a diuretic for mild congestive heart failure. Her serum digitalis level is 1.9 ng/ml, serum calcium level is 7.8 mg/ml and serum potassium level is 3.0 mEq/L. On arrival in the operating room the awake ECG demonstrates atrial fibrillation with a ventricular rate of 90.

The most appropriate action at this time is to

(A) Delay operation until a Swan-Ganz catheter is inserted
(B) Start infusion containing potassium at 40 mEq/L and proceed with anesthesia
(C) Administer lidocaine, 100 rugs intravenously as a bolus and proceed with anesthesia
(D) Induce general anesthesia with thiopental, cardioverte to sinus rhythm and proceed
(E) Slowly induce halothane-oxygen anesthesia after intravenous administration of 1.0gm calcium gluconate

Please choose the best answer. All discussion welcomed!