Case study woman 38, 2-day history of weakness and postural dimness History: laxativeabuse with multiple bowel movements each day Physical examination BP110/60 mmHg falls to 80/50 mmHg HR 100 beats/min and regular Skin turgor is poor The mucous membrane is drywoman 38 ， 2-day history of weakness and postural dizziness History：laxativeabuse with multiple bowel movements each day Physical examination： BP 110/60 mmHg falls to 80/50 mmHg HR 100 beats/min and regular Skin turgor is poor The mucous membrane is dry Case study