During the last two years we have made a study of the blood pressure changes which occurred during the hospital management of patients suffering from prostatic obstruction.
The original object of these observations was to obtain, if possible, additional data which might assist us in determining the most advantageous method of preparing such patients for operation as well as the most suitable time for undertaking such an operation. Also, observations on the blood pressure of patients who have been relieved of their urinary obstruction for some time have revealed findings worthy of note.
This report comprises the results of the study of fifty-six patients with urinary retention due to prostatic obstruction, fifty-five of whom were operated on. The average age of this group was 61 years. The oldest patient was 86 and the youngest 46 years of age.
Prior to the estimation of the amount of residual urine, the blood