<prompt> Most common electrolyte imbalance that causes Paralytic ileus is?HyponatremiaHypernatremiaHypokalemiaHyperkalemia  <response>: ANSWER: C HypokalemiaREF: With textParalytic ileus can develop as a result of trauma, toxemia, peritonitis, electrolyte deficiency especially hypokalemia, or the use of certain drugs, such as pain medications, ganglionic blockers, or anticholinergics Ref: SRB Manual of Surgery 4th ed page 1000, Understanding Diseases Lippincott Williams Wilkin Page 328Paralytic effects of hypokalemia on intestinal smooth muscle may cause intestinal ileus. Ref Harrison 18th ed chapter 45Gastroenteritis is the most common cause of a paralytic ileus. Leading pharmacological cause of paralytic ileus is Narcotic use. Ref: Review for USMLE: United States Medical Licensing Examination Step 3 by Mitchell H. Rosner page 286 