JAMA Neurol:急性脑损伤患者的脑组织缺氧与脑电图周期性放电

2017-01-24 MedSci MedSci原创

不符合癫痫发作标准的周期性放电(PDs)在急性脑损伤后的脑电图(EEG)中经常被记录到。然而,其与脑代谢和是否进行临床干预之间的联系还未明确。最近发表在JAMA Neurol上的一项研究中,研究人员进行了一项研究对该联系进行了探讨。这是一项瞻性队列研究,包括90例因自发性蛛网膜下腔出血而昏迷的患者,这些患者持续头皮脑电图(sEEG)记录和综合监测,包括皮层侵入性深部脑电描记术、局部脑组织氧分压(p

不符合癫痫发作标准的周期性放电(PDs)在急性脑损伤后的脑电图(EEG)中经常被记录到。然而,其与脑代谢和是否进行临床干预之间的联系还未明确。

最近发表在JAMA Neurol上的一项研究中,研究人员进行了一项研究对该联系进行了探讨。

这是一项瞻性队列研究,包括90例因自发性蛛网膜下腔出血而昏迷的患者,这些患者持续头皮脑电图(sEEG)记录和综合监测,包括皮层侵入性深部脑电描记术、局部脑组织氧分压(partial pressure of brain tissue oxygen,PbtO2)监测、和局部脑血流 (rCBF) 监测。病人数据收集从2006年6月1日到2014年9月1日,在一个单一的三级医疗中心。回顾性分析自2014年9月1日至2016年5月1日进行,分析时假设脑组织氧代谢主要取决于放电频率。

研究中,共入组90例患者(26名男性和64名女性;平均[SD]年龄,55 [ 15 ]岁),32(36%)例PDs在sEEG和dEEG监测中被记录到,还有21(23%)例只在dEEG中被记录。PDs的频率范围从0.5Hz到2.5Hz。没有出现PDs的患者的PbtO2中位数为23 mmHg vs出现PDs的患者,2Hz时16mmHg和2.5Hz时14mmHg(从0-2.5Hz的差异显著)。变点分析证实,高频率的PD发病(≥2 Hz)PbtO2的降低有时间联系(发作5-10分钟后,标准化平均PbtO2下降25%)。0Hz时,CBF区域增加21.0 mL/100g/min,1Hz时25.9 mL/100g/min,1.5 Hz时27.5 mL/100g/min,2 Hz时34.7 mL/100 g/min;全脑灌注压增加分别为91mmHg(0Hz),100.5mmHg(0.5Hz),95.5mmHg(1Hz),97mmHg(2Hz),98.0mmHg(2.5Hz),95.0mmHg(2.5Hz),PD频率更高时67.8mmHg(3.0Hz )。

这些数据指出,医疗人员需要重新定义癫痫的连续放电和周期性放电,同时该研究也提示急性脑损伤后的额外伤害可以通过EEG的频率变化来反映。出现PDs的患者的癫痫样发作及脑血流量增加弥补了脑代谢的需求,但是更高频率的PDs(> 2次/秒)因未有脑血流量增加而不能正常代偿且与脑组织缺氧有关,同时,更高频率的PDS可反映脑代偿机制。

原始出处:

Witsch J1, Frey HP,et al.Electroencephalographic Periodic Discharges and Frequency-Dependent Brain Tissue Hypoxia in Acute Brain Injury.JAMA Neurol. 2017 Jan 9. doi: 10.1001/jamaneurol.2016.5325.

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    2017-09-08 yinhl1978
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    2017-01-26 yahu