Cerebral Blood Flow, Heart Rate, and Blood Pressure Patterns during the Tilt Test in Common Orthostatic Syndromes

Figure 21

This example shows arteficial drift in the plethysmographic finger BP that may be misinterpreted as orthostatic hypotension. The spurious decline in BP continued in spite of multiple repositionings of a sensor. Note that oscillometric BP from the upper arm (green boxes) shows absent orthostatic hypotension. There are a number of extrasystoles in the HR. BP was interpreted as normal. CBFv responses to the tilt were abnormal as there was a drop in CBFv from the supine 59.4 cm/sec to 36.5 cm/sec at the end of the tilt. Patient was dizzy during the tilt. The final diagnosis was orthostatic cerebral hypoperfusion syndrome. Data from 43-year-old man.