PMC4639644_01
Precranioplasty findings. DAR value for each electrode in clino- and orthostatic positions, shown on a logarithmic scale (a). Brain CT scan showing the posthemorrhagic lesion and extent of craniotomy (b). Delta power band distribution maps in clino- (c) and orthostatic (d) positions. Mean normalized band powers of F3 and F4 signals in clino- ((e)(A)) and orthostatic ((e)(B)) positions. DAR in F3 and F4 in both positions ((e)(C)). ** indicates p < 0.001.
CRINM2015-318917.001.jpg
PMC4639644_01_CRINM2015-318917.001.jpg
fig1
Before cranioplasty, a change in DAR value across the postural change was observed (Figure 1(a)). Due to the extent of the craniotomy (Figure 1(b)), several electrodes were on the breach (F3, C3, P3, F7, and T3), but a DAR increase was observed only in F3. Accordingly, in clinostatic position, the highest values of delta band power were recorded in correspondence of posthemorrhagic lesion and in frontal regions (Figure 1(c)), while in orthostatism this distribution extended to involve F3 region (Figure 1(d)).  Figure 1(e) shows mean normalized band powers of F3 and F4: in clinostatism (Figure 1(e)(A)) band powers were similar for each homologue band, while, after 2 hours in the orthostatic position, an asymmetry was evident between these electrodes (Figure 1(e)(B)). In clinostatism, DAR was 2.66 +- 0.49 at F3 and 2.81 +- 0.46 at F4 (p > 0.05), while, in the orthostatic position, it was 9.81 +- 1.87 at F3 and 1.51 +- 0.29 at F4 (p < 0.001) (Figure 1(e)(C)).
Postcranioplasty findings. DAR value for each electrode in clino- and orthostatic positions, shown on a logarithmic scale (a). Brain CT scan showing the posthemorrhagic lesion and cranioplasty results (b). Delta power band distribution maps in clino- (c) and orthostatic (d) positions. Mean normalized band powers of F3 and F4 signals in clino- ((e)(A)) and orthostatic ((e)(B)) positions. DAR in F3 and F4 in both positions ((e)(C)).
CRINM2015-318917.002.jpg
PMC4639644_01_CRINM2015-318917.002.jpg
fig2
After cranioplasty, no posture-related DAR differences at any electrodes were observed (Figure 2(a), p > 0.05). The spectral signals at F3 and F4 remained symmetrical (p > 0.05, Figures 2(c), 2(d), and 2(e)).