Figure/Graphic 1A-D: Kipptisch
Upright tilt-induced responses of a patient from the tilt-negative group. Panel A. Normal heart rate response to upright tilt. The postural change at 600 s of the recording is accompanied by a certain RR interval shortening. Panel B. Although the fluctuations in systolic BP are augmented following the upright tilt, no clinically significant hypotension is recorded. Panels C and D. Variations in HR (C) and systolic BP (D) powers with time, as assessed by the windowed FFT method. Solid lines indicate total power, dashed lines indicate LF power, and dotted lines indicate HF power. The upright tilt manoeuvre elicits transient elevations in the LFHRV and TFHRV power. The BP power reveal immediate tilt-related increases in the same spectral bands, followed by subsequent fluctuations of lesser magnitude. The terminal increases in the BPV components are related to the motion artefacts at the time of termination of tilting.