Amin Ushtar, Sullivan Lucy, Trudeau Pat, Benbadis Selim R
1 University of South Florida, Tampa, FL, USA.
2 RSC Diagnostic Services, Richardson, TX, USA.
Clin EEG Neurosci. 2019 May;50(3):219-221. doi: 10.1177/1550059418813020. Epub 2018 Nov 14.
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, χ(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.
睡眠期枕区正相尖波（POSTS）和λ波具有相似的形态和位置。我们研究了这两种正常脑电图模式之间可能存在的关联。我们回顾了在3个月期间（2017年10月16日至2018年1月19日）一系列连续入选的动态脑电图，并确定了有POSTS的记录和有λ波的记录。使用卡方检验进行统计分析。共回顾了140份动态脑电图。脑电图时长从24小时至168小时不等（平均76小时）。研究人群中男性占34%，年龄范围为3岁至93岁（平均48岁）。在这140份记录中，30份异常，其中20份有癫痫样异常。独立性卡方检验（采用耶茨连续性校正）表明POSTS和λ波之间存在显著关联，χ(1, n = 140) = 69.208，p <.001，φ = 0.72。此外，有λ波的记录中100%有POSTS，有POSTS的记录中72%有λ波。λ波和POSTS之间存在高度关联。这表明这两种波形有很强的相似性，并且可能有一个共同的枕区发生器。
