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70 woman undergoing vaginal hysterectomy to be randomly allocated to receive either 20 unit of vasopressin in 100mL of normal saline intra cervically or control (no vasopressin or saline), preoperatively from August 2011 to September 2012.
Preparation of vasopressin solution: 20 unit of vasopressin in 100 ml of normal saline was used.