Electroencephalography as a Tool for Assessment of Brain Ischemic Alterations after Open Heart Operations

Table 2

Global changes of BEA after open heart operation∗.

	Patient group dynamics**	Group effect***	Local dynamics**	Local group effects***
Total alpha-2 power decrease	F = 5.28,; P =  .032	NS	F3, Fz, C3, C4, Cz, P3, P4, Pz, O1, O2, Oz,T5	T4 (larger decrease in controls)
Total beta-1 power increase	F = 7.28,; P =  .013	F = 6.11,; P =  .020	C3, C4, Cz, P3, P4, Pz, O1, O2, T3, T5, F8, T4, T6	C3, C4, Cz, P3, P4, Pz, O1, O2, F8, T4, T6
Total beta-2 power increase	F = 5.42,; P =  .030	F = 3.41,; P =  .076	C3, P3, P4, Pz, O1, O2, T3, T5, F8, T6	Fpz, F3, C3, C4, Cz, P4, T4
Total delta-1 mean frequency increase	F = 15.8,; P =  .001	F = 10.2,; P =  .004	Fp2, C3, C4, P4, Pz, O1, O2, F7, T3, T5, F8, T4, T6	C3, C4, P3, Pz, O1, O2, Oz, F7, T3
Total delta-2 mean frequency increase	F = 16.2,; P =  .001	NS	Fp2, Fpz, F3, F4, C3, C4, Cz, P4, O2, Oz, F7, T5, F8, T4, T6	Fp2, Fpz, Cz, T4
Total alpha-2 mean frequency increase	F = 4.25,; P =  .049	NS	P3, Pz, T3	NS

*Findings at P  <  .1 are presented.
** Repeated measures ANOVAs or Wilcoxon tests included only patients.
*** Repeated measures ANOVAs included patients and normal controls.