Figure 12
From: Noninvasive detection of elevated ICP using spontaneous tympanic membrane pulsation
The energy ratios of TMp waveforms at the head-up-tilt and head-down-tilt for all 15 subjects. The ratios were significantly lower (P = .004, unpaired two tailed t-test) for the HDT. A threshold (dashed line) at 0.25 separates the normal and elevated ICP with 76.67% accuracy. A significant ratio reduction with HDT was observed in all study subjects as seen in Table 2 (P = 4.3E−9, paired two tailed t-test) Therefore, if a HUT position energy ratio is available, the accuracy of detecting elevated ICP (HDT) will rise to 100%.
