中重度颅脑外伤患者合并阵发性交感神经过度兴奋综合征的危险因素及对预后的影响

目的 分析在中重度颅脑外伤患者中与阵发性交感神经过度兴奋综合征（paroxysmal sympathetic hyperactivity,PSH）相关的危险因素,并分析PSH对此类患者预后的影响。方法 选择在我院收治的中重度颅脑外伤患者为研究对象。收集所有患者的人口学信息和临床诊治信息。按照是否合并PSH将患者分为PSH组（n=27）和对照组（n=99）,对相关变量进行回归分析,并分析PSH对中重度颅脑损伤预后［住院时间,住ICU时间,格拉斯哥预后评分(Glasgow Outcome Scale,GOS)］的相关性。结果 共纳入患者126 例（男性 82 例,女性 44例）,共有27例发生了PSH（21.4%）。与PSH发生相关的危险因素包括入院时收缩压>140 mmHg(1 mmHg=0.133 kPa)（OR=3.21,95%CI=1.31~7.87,P=0.011）,GCS<8分(OR=4.34,95%CI=1.73~10.93,P=0.002),创伤后急诊CT提示存在脑挫裂伤（OR=4.29,95%CI=2.55~8.26,P<0.001）,颅内出血量≥50 ml（OR=2.33,95%CI=1.42~5.13,P=0.003）以及后期出现脑积水(OR=3.57,95%CI=1.36~9.37,P=0.010)。而PSH又与住院时间>1个月（OR=5.21,95%CI=2.88~7.42,P=0.002）和GOS 1~3分有关（OR=1.75,95%CI=1.24~3.78,P=0.009）。结论 PSH是中重度颅脑外伤患者的一种常见并发症。PSH的发生与入院时收缩压较高、GCS较低、合并脑挫伤以及后期合并脑积水等因素密切相关,而合并PSH的患者住院时间更长,预后更差。     

Community violence exposure correlates with smaller gray matter volume and lower IQ in urban adolescents

Adolescents’ exposure to community violence is a significant public health issue in urban settings and has been associated with poorer cognitive performance and increased risk for psychiatric illnesses, including PTSD. However, no study to date has investigated the neural correlates of community violence exposure in adolescents. Sixty‐five healthy adolescents (age = 14–18 years; 36 females, 29 males) from moderate‐ to high‐crime neighborhoods in Los Angeles reported their violence exposure, parents’ education level, and free/reduced school lunch status (socio‐economic status, SES), and underwent structural neuroimaging and intelligence testing. Violence exposure negatively correlated with measures of SES, IQ, and gray matter volume. Above and beyond the effect of SES, violence exposure negatively correlated with IQ and with gray matter volume in the left inferior frontal gyrus and anterior cingulate cortex, regions involved in high‐level cognitive functions and autonomic modulation, and previously shown to be reduced in PTSD and combat‐exposed military populations. The current results provide first evidence that frontal brain regions involved in cognition and affect appear to be selectively affected by exposure to community violence, even in healthy nondelinquent adolescents who are not the direct victims or perpetrators of violence.     

Parálisis unilateral aislada del nervio oculomotor común posterior a trauma craneoencefálico leve

Isolated traumatic oculomotor nerve (ON) palsy is an uncommon clinical presentation of mild traumatic brain injury (TBI). There are very few cases in which it has been possible to demonstrate the isolated damage of the ON by avulsion of the roots, accompanied with traumatic axonal injury and intraneural microhemorrhage. We present a 23-year-old female who, after mild TBI, began to experience right ptosis, binocular diplopia, and photophobia. Clinical examination showed a complete ophthalmoparesis of the right ON, without other neurological deficits. Neuroimaging studies demonstrated no structural compressive damage of the right ON. Magnetic resonance imaging (MRI) with Gradient-echo and T1 weighted post-gadolinium was made, demonstrating signs of intraneural hemorrhage of the right ON, in addition to traumatic axonal injury extending from the right cerebral peduncle to the orbital fissure. Specific MRI protocols contribute as evidence of an isolated lesion to the ON.     

A signal detection–item response theory model for evaluating neuropsychological measures

Introduction: Models from signal detection theory are commonly used to score neuropsychological test data, especially tests of recognition memory. Here we show that certain item response theory models can be formulated as signal detection theory models, thus linking two complementary but distinct methodologies. We then use the approach to evaluate the validity (construct representation) of commonly used research measures, demonstrate the impact of conditional error on neuropsychological outcomes, and evaluate measurement bias.

Method: Signal detection–item response theory (SD–IRT) models were fitted to recognition memory data for words, faces, and objects. The sample consisted of U.S. Infantry Marines and Navy Corpsmen participating in the Marine Resiliency Study. Data comprised item responses to the Penn Face Memory Test (PFMT; N = 1,338), Penn Word Memory Test (PWMT; N = 1,331), and Visual Object Learning Test (VOLT; N = 1,249), and self-report of past head injury with loss of consciousness.

Results: SD–IRT models adequately fitted recognition memory item data across all modalities. Error varied systematically with ability estimates, and distributions of residuals from the regression of memory discrimination onto self-report of past head injury were positively skewed towards regions of larger measurement error. Analyses of differential item functioning revealed little evidence of systematic bias by level of education.

Conclusions: SD–IRT models benefit from the measurement rigor of item response theory—which permits the modeling of item difficulty and examinee ability—and from signal detection theory—which provides an interpretive framework encompassing the experimentally validated constructs of memory discrimination and response bias. We used this approach to validate the construct representation of commonly used research measures and to demonstrate how nonoptimized item parameters can lead to erroneous conclusions when interpreting neuropsychological test data. Future work might include the development of computerized adaptive tests and integration with mixture and random-effects models.     

高压氧对重型颅脑外伤患者血清和肽素的影响

目的探讨高压氧对重型颅脑外伤患者血清和肽素水平的影响及临床意义。方法选取重型颅脑损伤患者76例,随机将其分为对照组及研究组,研究组在对照组基础上予以高压氧治疗。比较研究组在高压氧治疗后、对照组于常规治疗后第1、2、3周结束次日血清和肽素水平;比较两组患者治疗后GCS评分变化。结果高压氧治疗作用下,与对照组相比较研究组患者血清和肽素水平在高压氧治疗后第1、2、3周结束时均降低(P0.05)。治疗3周后两组患者的GCS评分均较治疗前提高(P0.05),高压氧组患者GCS评分提高更加明显(aP0.05)。结论高压氧治疗能降低重型颅脑外伤患者血清和肽素水平并促进重型颅脑外伤患者康复,高压氧治疗有助于重型颅脑外伤患者康复可能与高压氧治疗下患者血清和肽素水平降低相关。