Zijlmans Maeike, Jacobs Julia, Zelmann Rina, Dubeau François, Gotman Jean
Montreal Neurological Institute and Hospital, McGill University, 3801 University Street, Montreal (Québec), Canada H3A 2B4.
Epilepsy Res. 2009 Aug;85(2-3):287-92. doi: 10.1016/j.eplepsyres.2009.03.026. Epub 2009 Apr 29.
High frequency oscillations (HFOs) have been associated with epileptogenicity. In rats, the extent of HFOs (>200 Hz) is correlated with seizure frequency. We studied whether the same applies to patients with focal epilepsy. Thirty-nine patients with intracerebral EEG sampled at 2000 Hz were studied for interictal ripples (80-250 Hz), fast ripples (FR, 250-500 Hz) and spikes. Seizure frequency before implantation was compared to numbers of channels with HFOs (>1/min). Analyses were repeated for HFO rates of >5, >10 and >20. Separate analyses were done for 25 patients with temporal lobe epilepsy only and for a selection of similar unilateral temporal channels in 12 patients. No linear correlation or trend was found relating the number of channels with HFOs and seizure frequency. There was a linear positive correlation between the number of channels with more than 20 FRs/min and seizure frequency. The hypothesis that the more tissue generating HFOs, the higher the seizure frequency, was not confirmed, though there might be a correlation for high FR rates.
高频振荡(HFOs)与致痫性有关。在大鼠中,HFOs(>200Hz)的程度与癫痫发作频率相关。我们研究了这是否同样适用于局灶性癫痫患者。对39例以2000Hz采样颅内脑电图的患者进行了发作间期涟漪(80 - 250Hz)、快涟漪(FR,250 - 500Hz)和棘波的研究。将植入前的癫痫发作频率与有HFOs(>1次/分钟)的通道数量进行比较。对HFOs频率>5、>10和>20的情况重复进行分析。仅对25例颞叶癫痫患者以及1,2例患者中选择的类似单侧颞叶通道进行了单独分析。未发现有HFOs的通道数量与癫痫发作频率之间存在线性相关或趋势。每分钟有超过20次FRs的通道数量与癫痫发作频率之间存在线性正相关。虽然对于高FR频率可能存在相关性,但“产生HFOs的组织越多,癫痫发作频率越高”这一假设未得到证实。