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Of the two forms of orthostatic hypotension, one, the arterial orthostatic anemia or hypotonic regulatory disturbance (1), is characterized by an increase in the pulse rate and a fall of the systolic blood pressure, with or without a rise in the diastolic pressure, upon change from the recumbent to the erect posture. These circulatory reactions are due to an increased activity of the sympathetic nervous system, which normally compensates for the hydrostatic displacement of blood due to the changes in position. In the second form, the postural hypotension or hypodynamic regulatory disturbance, this reaction of the sympathetic system to changes in posture is absent. The result is a momentary fall of the systolic as well as the diastolic blood pressure during a change from the recumbent to the erect posture, the pulse rate being maintained at a constant level (Figure 1). Postural hypotension was described for the first time in 1925 by Bradbury and Eggleston (2). It is a rather rare condition, of which Springarn and Hitzig (3), in 1942, found only 50 cases described in the literature. It is supposed to be due to organic lesions in the brain stem or spinal cord, following encephalitis, encephalomalacia and tumors,

TWO CASES OF POSTURAL HYPOTENSION SHOWING A DEFICIENCY IN RELEASE OF NOR-EPINEPHRINE AND EPINEPHRINE