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Exploring high-frequency oscillation as a marker of brain ischemia using S-transform

机译:使用S变换探索高频振荡作为脑缺血的标志

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Brain injury, such as hypoxic-ischemia produced in brain after cardiac arrest, is known to alter somatosensory evoked potential (SSEP) signals, thus serving a diagnostic role. This study explores the high-frequency oscillation (HFO) in SSEP recorded in a rat model of asphyxial cardiac arrest. To best characterize this complex oscillatory activity, several time-frequency representation strategies are implemented and compared. The S-transform (ST) is found to precisely localize the HFO in temporal-spectral space. More, the ‘phase ST’—the inter-trial coherence (ITC) sensitively detects the phase-locked activities in HFO. Using ST and ITC, we explored the evolution of HFO during early recovery from brain injury. A discrepancy between the amplitude of HFO, which increases over time, and its phase, which stays time-invariant, is revealed here. The recovery dynamics of HFO mirrors that of N10 in terms of their amplitudes, which suggests HFO as a prelude of large-scale cortical responses. In addition, statistics shows the amplitudes of HFOs have different levels (p<0.05) and recovery dynamics (p=0.03) between the good- and bad-outcome groups. We consider the HFO to be reflective of the health of thalamocotical circuitry in brain ischemia.
机译:众所周知,脑损伤(例如心脏骤停后在大脑中产生的缺氧缺血)会改变体感诱发电位(SSEP)信号,从而起到诊断作用。这项研究探索了在窒息性心脏骤停的大鼠模型中记录的SSEP中的高频振荡(HFO)。为了最好地表征这种复杂的振荡活动,实施并比较了几种时频表示策略。发现S变换(ST)可以将HFO精确定位在时间谱空间中。此外,“阶段ST”(试验间一致性(ITC))可以灵敏地检测HFO中的锁相活动。使用ST和ITC,我们探索了脑损伤早期恢复过程中HFO的演变。此处显示了随时间增加的HFO振幅与保持时间不变的相位之间的差异。 HFO的恢复动力学在幅度方面与N10相当,这表明HFO是大规模皮质反应的前奏。此外,统计数据显示,好结果组和坏结果组之间的HFO振幅具有不同的水平(p <0.05)和恢复动态(p = 0.03)。我们认为HFO可以反映丘脑回路在脑缺血中的健康状况。

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