Abstract
All patients operated on at the Woman's Hospital have the blood pressure taken and recorded at least three times: (1) when the physical examination is made soon after admission; (2) just prior to the administration of the anesthetic, and (3) at the completion of the operation. If it is a critical case, the blood pressure is taken at frequent intervals during the operation, and at corresponding intervals in the postoperative period. If at the first examination the blood pressure is markedly abnormal, it is taken repeatedly during the study of the case, and the lowest pressure observed during this study is considered normal for that patient unless there are attenuating circumstances. It often takes several observations to approximate the normal level, but unless this is done the blood pressure figures may be grossly misleading. This is especially true when the patient comes to the hospital one day and is operated

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