Pleural drainage using modified pigtail catheters

An 8.3-Fr modified pigtail catheter has been developed for chronic percutaneous drainage of pericardial effusions. Placement of this catheter using a modified Seldinger technique is virtually atraumatic. To test the safety and efficacy of this catheter for pleural drainage, it was used to manage eight collections of pleural fluid and nine pneumothoraces in a total of 12 infants and children. There were no placement complications. Fluid accumulations were satisfactorily drained in every instance. Pneumothoraces were treated definitively with a single catheter, except when a bronchopleural fistula was present. Percutaneous pigtail drainage of pleura fluid or air is simple, safe, effective, and substantially less traumatic than standard chest-tube placement.     

中频交变磁场照射后小鼠的行为学变化

目的:目前电磁辐射对生物体行为学方面的研究还很薄弱,设立不同磁场的强度和不同照射的周期,观察中频领域磁场照射对小鼠的自主活动和学习记忆的影响。方法:实验于2007-05-10/06-15在清华大学医学院和中国医学科学院药用植物研究所完成。①实验材料:磁场发生装置:中频交变磁场发生装置由清华大学工程物理系医学物理与工程研究所自主研发,可产生频率为40kHz,场强为28.8A/m,28.8kA/m的中频交变磁场。自主活动测试箱:中国医学科学院药用植物研究所提供,为一可封闭的金属箱,内置摄像头。4只黑色塑料测试桶分别置于箱子四角。水迷宫测试箱:中国医学科学院药用植物研究所提供。②实验动物及方法:将80只小鼠随机分为不同场强照射组和对照组。强磁场照射1组:11.6kA/m/40kHz,1h/d,连续照射7d。强磁场照射2组:11.6kA/m/40kHz,2h/d,连续照射7d。强磁场照射3组:11.6kA/m/40kHz,2h/d连续照射15d。弱磁场照射组:28.8kA/m/40kHz,2h/d,连续照射7d。对照组除了未放入磁场照射,其他条件与照射组一致。实验过程中对动物处置符合动物伦理学要求。③实验评估:观察其一般活动的改变,并采用自主活动测试箱和水迷宫测试箱进行测试,观察各组小鼠的自主活动和学习记忆的改变。结果:①一般行为观察:与对照组小鼠对比,经过中频交变磁场照射过的各组小鼠活跃度减低,毛色较差。强磁场照射3组(145G,2h/d,连续15d)于第11天和13天分别死亡1只。②自主活动检测结果:强磁场照射2,3组小鼠的运动路程、运动速度、运动时间明显低于对照组(P<0.05)。③水迷宫测试结果:在学习记忆检测阶段撤掉平台,发现各组动物2min内穿越平台原来所在象限的次数没有明显差别(P>0.05)。结论:中频交变磁场照射会给小鼠的自发活动造成一定影响,对学习记忆没有影响。     

Effect of atrial natriuretic factor on bronchomotor tone in the normal human airway

1. Asthmatic patients bronchodilate in response to infused atrial natriuretic factor. We wished to determine whether the airways of normal subjects responded in a similar way. 2. Changes in airway resistance, as determined by specific airway conductance, were measured in eight normal subjects in response to intravenous infusion of atrial natriuretic factor at doses of 0.5, 2 and 10 pmol min-1 kg-1. 3. No significant effect was observed on specific airway conductance at any rate of infusion despite maximum mean (SEM) plasma levels of 597 (62) pg of atrial natriuretic factor/ml in peripheral venous blood. 4. A second study was performed using six of the eight original subjects and employing a pharmacological dose of 50 pmol of atrial natriuretic factor min-1 kg-1. This produced mean plasma levels of 2056 pg/ml and a mean increase of 31% in specific airway conductance. 5. It is concluded that pharmacological, but not pathophysiological, elevations of plasma atrial natriuretic factor may significantly alter bronchomotor tone in normal subjects.     

Exposure to Traumatic Events and the Behavioral Health of Children Enrolled in an Early Childhood System of Care

Children may be exposed to numerous types of traumatic events that can negatively affect their development. The scope to which studies have examined an array of events among young children has been limited, thereby restricting our understanding of exposure and its relationship to behavioral functioning. The current cross‐sectional study describes traumatic event exposure in detail and its relationship to behavioral health among an at‐risk sample of young children (N = 184), under 6 years of age, upon enrollment into an early childhood, family‐based, mental health system of care. Caregivers completed home‐based semistructured interviews that covered children's exposure to 24 different types of traumatic events and behavioral and emotional functioning. Findings indicated that nearly 72% of young children experienced 1 or more types of traumatic events. Multiple regression model results showed that exposure was significantly associated with greater behavioral and emotional challenges with children's age, gender, race/ethnicity, household income, and caregiver's education in the model. These findings highlight the prevalence of traumatic exposures among an at‐risk sample of young children in a system of care and suggest that this exposure is associated with behavioral and emotional challenges at a young age.     

In vivo and in vitro adjuvant activities of the B subunit of Type IIb heat-labile enterotoxin (LT-IIb-B5) from Escherichia coli

The pentameric B subunit of the Escherichia coli LT-IIb enterotoxin (LT-IIb-B₅) activates TLR2 signaling in macrophages. Herein we demonstrate that LT-IIb-B₅, in contrast to a TLR2-nonbinding point mutant, induces functional activation of bone marrow-derived dendritic cells and stimulates CD4⁺ T cell proliferation, activities which suggested that LT-IIb-B₅ might function as an adjuvant in vivo. Indeed, in an intranasal mouse immunization model, LT-IIb-B₅ augmented specific mucosal and serum antibody responses to a co-administered immunogen, at levels which were almost comparable to those induced by intact LT-IIb holotoxin, a potent but toxic adjuvant. Therefore, LT-IIb-B₅ displays useful adjuvant properties which, combined with lack of enterotoxicity and relative stability against degradation, may find application in mucosal vaccines.     

Undergraduate Cancer Training Program for Underrepresented Students: Findings from a Minority Institution/Cancer Center Partnership

Students from racially/ethnically diverse backgrounds are underrepresented in graduate programs in biomedical disciplines. One goal of the Minority Institution/Cancer Center partnership between New Mexico State University (NMSU) and the Fred Hutchinson Cancer Research Center (FHCRC) is to expand the number of underrepresented students who are trained in cancer research. As part of the collaboration, a summer internship program has been organized at the FHCRC. The program runs for 9 weeks and involves mentored research, research seminars, coffee breaks, social activities, and a final poster session. This study examined the graduate school attendance rates of past interns, explored interns’ perceptions of the training program, and identified ways to improve the program. Thirty undergraduate students enrolled at NMSU participated in the internship program from 2002 to 2007 and telephone interviews were conducted on 22 (73%) of them. One-third of the students were currently in graduate school (32%); the remaining were either working (36%), still in undergraduate school (27%), or unemployed and not in school (5%). Students rated highly the following aspects of the program: mentored research, informal time spent with mentors, and research seminars. Students also reported the following activities would further enhance the program: instruction on writing a personal statement for graduate school and tips in choosing an advisor. Students also desired instruction on taking the GRE/MCAT, receiving advice on selecting a graduate or professional school, and receiving advice on where to apply. These findings can inform the design of internship programs aimed at increasing rates of graduate school attendance among underrepresented students.     

Tuberculous dactylitis—an easily missed diagnosis

The prevalence of tuberculosis (TB) continues to rise worldwide. Current migration patterns and increased travel to high-prevalence TB countries will result in more frequent presentations of less common forms of TB. Tuberculous dactylitis, a form of tuberculous osteomyelitis, is well recognised in countries with a high prevalence of TB. We provide a systematic review of all published cases of tuberculous dactylitis in children and adolescents and describe a case to illustrate the typical features of the disease. Our review revealed 37 cases of tuberculous dactylitis in children and adolescents, all reported in the last 17 years. Children less than 10 years of age are most frequently affected and the hand is the most commonly affected site. Concurrent pulmonary TB is present in a fifth of cases and systemic symptoms are usually absent. Positive TST and IGRA support the presumptive diagnosis, but cannot be used as rule-out tests. The definitive diagnosis relies on the detection M. tuberculosis by PCR or culture. Treatment should comprise of a standard three to four drug anti-tuberculous regimen. The optimal treatment duration remains unknown. Surgery has a limited role in the treatment in general but may play a supportive role, and curettage of the cavity has been recommended for avascular lesions.