Syncope and Epilepsy coexist in ‘possible’ and ‘drug-resistant’ epilepsy (Overlap between Epilepsy and Syncope Study - OESYS)

Table 2 EEG and neuroradiological (CT/MRI) findings

	Total population (n = 107)	Possible Epilepsy (n = 63, 58.9%)	Drug-resistant Epilepsy (n = 44, 41.1%)
EEG: normal pattern^a, n (%)	12 (11.2)	12 (19.0)	0 (0)
EEG: abnormal not epileptiform^b, n (%)	61 (57.0)	51 (81.0)	10 (22.7)
EEG: epileptiform^c, n (%)	34 (31.8)	0 (0.0)	34 (77.3)
Temporal lobe spike activity, n (%)	27 (25.2)	0 (0.0)	27 (61.4)
Neuro-imaging (CT/MRI)
Normal, n (%)	58 (54.2)	40 (63.5)	18 (40.9)
Tumors, n (%)	4 (3.7)	3 (4.8)	1 (2.3)
Cortical Atrophy, n (%)	9 (8.4)	5 (7.9)	4 (9.1)
Leukoaraiosis, n (%)	24 (22.4)	14 (22.2)	10 (22.7)
Neurosurgery findings, n (%)	7 (6.5)	0 (0.0)	7 (15.9)
Cortico-subcortical infarcts, n (%)	2 (1.9)	0 (0.0)	2 (4.5)
Limbic Encephalitis findings, n (%)	1 (0.9)	0 (0.0)	1 (2.3)
Cortical malformations, n (%)	2 (1.9)	1 (1.6)	1 (2.3)

CT computed tomography, EEG electroencephalogram, MRI magnetic resonance imaging
^aBackground activity generally characterized by alpha rhythm (with a frequency of 8–13 Hz), reacting to the opening and closing of the eyes, and a typical posterior representation; morphology mostly regular
^bSlow activity (theta activity) focal or diffuse, non-paroxysmal and/or non-dominant
^cEpileptiform activity (spikes; polyspikes, sharp waves, spikes and waves or polyspike-waves complexes) both generalized and focal

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