Positive occipital sharp transients of sleep (POSTS) and lambda waves have similar morphology and location. We studied a possible association between these 2 normal EEG patterns. We reviewed a series of consecutive unselected ambulatory EEGs during a 3-month period (October 16, 2017 to January 19, 2018) and identified records with POSTS and records with lambda waves. Statistical analysis was performed using a chi-square test. A total of 140 ambulatory EEGs were reviewed. Duration of EEGs ranged from 24 to 168 hours (mean 76 hours). The population was 34% males, with ages ranging from 3 to 93 years (mean 48 years). Of the 140 records, 30 were abnormal, including 20 with epileptiform abnormalities. A chi-square test for independence (with Yates continuity correction) indicated a significant association between POSTS and lambda waves, χ2(1, n = 140) = 69.208, p < .001, φ = 0.72. In addition, 100% of records with lambda waves had POSTS, and 72% of records with POSTS had lambda waves. There is a high association between lambda waves and POSTS. This suggests a strong similarity between the 2 waveforms, and possibly a common occipital generator.

中文翻译：

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睡眠的正枕尖瞬态与 Lambda 波之间的关联

正枕部睡眠急剧瞬变 (POSTS) 和 λ 波具有相似的形态和位置。我们研究了这 2 种正常 EEG 模式之间的可能关联。我们在 3 个月期间（2017 年 10 月 16 日至 2018 年 1 月 19 日）审查了一系列连续未选择的动态脑电图，并确定了带有 POSTS 的记录和带有 lambda 波的记录。使用卡方检验进行统计分析。总共审查了 140 个动态脑电图。EEG 的持续时间为 24 至 168 小时（平均 76 小时）。人口为 34% 的男性，年龄从 3 岁到 93 岁不等（平均 48 岁）。在 140 条记录中，有 30 条异常，其中 20 条为癫痫样异常。独立性的卡方检验（使用 Yates 连续性校正）表明 POSTS 和 λ 波之间存在显着关联，χ2(1, n = 140) = 69.208，p < .001，φ = 0.72。此外，100% 的 lambda 波记录有 POSTS，72% 的 POSTS 记录有 lambda 波。λ 波和 POSTS 之间存在高度关联。这表明 2 个波形之间有很强的相似性，并且可能是一个共同的枕骨发生器。