During the anesthesia outpatient consultation, patients proposed for minor abdominal surgery, known hypertensive patients are selected. On the day of the procedure, we check the blood pressure figures. If the numbers are high: SBP ≥ 180 and/or PAD≥110: we start by a filling as well as a dose of 1 mg Midazolam IV and the blood pressure figures are re-evaluated. If 3 measurements blood pressure figures remain above the threshold values: Surgery is postponed and the patient will be included to group (A) for canceled. If the blood pressure figures are correct, the surgery is accepted and the patient will be included in the group (NA) for not canceled.