Electroencephalography as a Tool for Assessment of Brain Ischemic
Alterations after Open Heart Operations
Table 3
Hemisphere effects on electric activity after open heart operations*.
Patient group dynamics**
Group effect***
Local dynamics**
Local group effects***
Right hemisphere
Delta-1 power did not change versus decrease in controls
NS
F = 6.67,
NS
C4, T4, T6 (decrease in controls)
Delta-2 power did not change versus decrease in controls
F = 3.62, P = .071
F = 5.95,
P4, T4 (increase)
C4, F8, T4, T6 (decrease in controls)
Theta-2 power did not change versus decrease in controls
NS
F = 5.49,
P4, T4, T6 (increase)
Fp2, C4, P4, T6 (decrease in controls)
Alpha-1 power did not change versus decrease in controls
NS
F = 5.83,
F8, T4 (increase)
T4 (decrease in controls)
Theta-1 power increase in central region
NS
F = 5.11,
P4, O2, T4, T6 (increase)
P4 (decrease in controls
Left hemisphere****
Delta-2 power increase in central region and no change in temporal region versus opposite dynamics in controls
NS
F = 4.42,
NS
T3 (increase in controls)
Theta-1 power did not change versus significant changes in controls
NS
F = 4.33, P = .042
NS
NS
Theta-2 power did not change versus significant changes in controls
NS
F = 4.83,
NS
NS
Alpha-2 power decrease
NS
F = 6.90, P = .014
F3, C3, P3, O1, T5
NS
Theta-2 mean frequency decrease in central region
NS
F = 5.30,
NS
NS
*Findings at P < .1 are presented.
**Repeated measures ANOVAs or Wilcoxon tests included only patients.
***Repeated measures ANOVAs included patients and normal controls.
****Statistics on interaction of time *central/temporal region *group factors in left hemisphere is presented.
