Polyethylene glycol (PEG) solution is currently used to prepare the colon before colonoscopy. Hyponatremic encephalopathy is a condition with neurologic symptoms such as headache, vomiting, confusion, seizure, and sometimes respiratory arrest. A 55-year-old woman presented to our emergency department with generalized tonic-clonic seizure and mental change after ingestion of PEG solution 2 L with water. Serum sodium concentrations was 115 mmol/L. After correction with hypertonic saline for 12hrs, serum sodium concentration reached 129 mmol/L and mental status recovered. We experienced a case of acute hyponatremic encephalopathy resulting from ingestion of PEG solution 2 L for colonoscopy.

• 백종훈(조선대학교 의학전문대학원 내과학교실) | Jong Hun Paek
• 김형남(조선대학교 의학전문대학원 내과학교실) | Hyung Nam Kim
• 신병철(조선대학교 의학전문대학원 내과학교실) | Byung Chul Shin
• 김현리(조선대학교 의학전문대학원 내과학교실) | Hyun Lee Kim
• 정종훈(조선대학교 의학전문대학원 내과학교실) | Jong Hoon Chung Corresponding author