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Effect of grade I and II intraventricular hemorrhage on visuocortical function in very low birth weight infants

机译：I级和II级脑室内出血对极低出生体重婴儿的视觉皮质功能的影响

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摘要

The neurological outcome for infants with Grade I/II intraventricular hemorrhage (IVH) is debated. The aim of this study was to determine whether very low birth weight infants (VLBW, <1500 g) with Grade I/II (IVH) have altered visuocortical activity compared with infants with no IVH. We assessed the quantitative swept parameter visual evoked potential (sVEP) responses evoked by three different visual stimuli. Data from 52 VLBW infants were compared with data from 13 infants with Grade I or II IVH, enrolled at 5-7 months corrected age. Acuity thresholds and suprathreshold response amplitudes were compared. Grating acuity (GA), contrast sensitivity (CS) and vernier acuity (VA) were each worse in the Grade I/II IVH compared with the no IVH groups (8.24 cpd in IVH group vs. 13.07 cpd in no IVH group for GA; 1.44% vs. 1.18% for CS and 1.55 arcmin vs. 0.58 arcmin for VA). The slopes of the response amplitude for CS and VA were significantly lower in IVH infants. The spatial frequency tuning function was shifted downward on the spatial frequency axis, without a change in slope. These results indicate that Grade I/II IVH are associated with deleterious effects on cortical vision development and function.
机译：患有I / II级脑室内出血（IVH）的婴儿的神经学结局存在争议。这项研究的目的是确定与没有IVH的婴儿相比，具有I / II级（IVH）的极低出生体重婴儿（VLBW，<1500 g）是否改变了内视皮层活动。我们评估了由三种不同视觉刺激引起的定量扫描参数视觉诱发电位（sVEP）反应。将来自52个VLBW婴儿的数据与来自13个年龄在校正年龄5-7个月的IVH或II级婴儿的数据进行比较。比较了敏锐度阈值和超阈值反应幅度。与没有IVH组相比，I / II级IVH的光栅敏锐度（GA），对比敏感度（CS）和游标敏锐度（VA）均较差（GA的IVH组为4.24 cpd，非IVH组为13.07 cpd; CS和CS分别为1.44％和1.18％和1.55 arcmin与VA为0.58 arcmin）。 IVH婴儿的CS和VA反应幅度的斜率明显较低。空间频率调谐功能在空间频率轴上向下移动，而斜率没有变化。这些结果表明I / II级IVH与皮层视觉发育和功能的有害影响有关。

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