A Patient's Bedside ECG Strips Show the Following Changes: Increased

A patient's bedside ECG strips show the following changes: increased PR interval; increased QRS width; and tall, peaked T waves.Vital signs are T 98.2° F; HR 118 beats/min; BP 146/90 mm Hg; and RR 18 breaths/min.The patient is receiving the following medications: digoxin 0.125 mg PO every day; D?1/2 normal saline with 40 mEq potassium chloride at 125 mL/hr; Cardizem at 30 mg PO q8h; and aldosterone at 300 mg PO q12h.The physician is notified of the ECG changes.What orders should the nurse expect to receive?

A) Change IV fluid to D51/2 normal saline and draw blood chemistry.
B) Give normal saline with 40 mEq of potassium chloride over a 6-hour period.
C) Hold digoxin and draw serum digoxin level.
D) Hold Cardizem and give 500 mL normal saline fluid challenge over a 2-hour period.