Microfluidic 'brain-on chip' systems to supplement neurological practice: development, applications and considerations.

Among the greatest general challenges in bioengineering is to mimic human physiology. Advanced efforts in tissue engineering have led to sophisticated 'brain-on-chip' (BoC) microfluidic devices that can mimic structural and functional aspects of brain tissue. BoC may be used to understand the biochemical pathways of neurolgical pathologies and assess promising therapeutic agents for facilitating regenerative medicine. We evaluated the potential of microfluidic BoC devices in various neurological pathologies, such as Alzheimer's, glioblastoma, traumatic brain injury, stroke and epilepsy. We also discuss the principles, limitations and future considerations of BoC technology. Results suggest that BoC models can help understand complex neurological pathologies and augment drug testing efforts for regenerative applications. However, implementing organ-on-chip technology to clinical practice has some practical limitations that warrant greater attention to improve large-scale applicability. Nevertheless, they remain to be versatile and powerful tools that can broaden our understanding of pathophysiological and therapeutic uncertainties to neurological diseases.

In this paper, the authors describe the role of microfluidic 'brain-on-chip' systems as a tool to model and study the human brain. While animal studies have provided significant insights, they lack the complexity of human brain tissue in order to verify the effects of drugs on patients, study complex physiological pathways or personalize regenerative therapies. This makes studying diseases of complex human organs challenging. Microfluidics is a field of study that can address these challenges by developing sophisticated and miniaturized devices that can chamber human tissue. These devices could allow scientists to better study diseases on a model that is accurate and controllable, allowing researchers to better understand complex diseases, assess drug efficacy to specific areas of the brain and potentially accelerate the development of new therapies. Herein, we characterize the principles, development and challenges of microfluidics and the role they have served in different neurological diseases.

Peritumoral edema in meningiomas: pathophysiology, predictors, and principles for treatment.

Meningiomas is a tumor of the meninges and is among the most common intracranial neoplasms in adults, accounting for over a third of all primary brain tumors in the United States. Meningiomas can be associated with peritumoral brain edema (PTBE) which if not managed appropriately can lead to poor clinical outcomes. In this review, we summarize the relevant pathophysiology, predictors, and principles for treatment of PTBE. The results of various case-reports and case-series have found that meningioma-associated PTBE have patterns in age, tumor size, and hormone receptor positivity. Our study describes how increased age, increased tumor size, tumor location in the middle fossa, and positive expression of hormone receptors, VEGF, and MMP-9 can all be predictors for worse clinical outcomes. We also characterize treatment options for PTBE such as glucocorticoids and VEGF inhibitors along with the ongoing clinical trials attempting to alleviate PTBE in meningioma cases. The trends summarized in this review can be used to better predict the behavior of meningioma-associated PTBE and establish prognosis models to identify at risk patients.

Magnitude of stunting and its determinant factors among children age 6-59 months at Debre Tabor comprehensive specialized hospital, South Gondar zone, North central Ethiopia, 2020.

Introduction: malnutrition continues to be a significant public health and development concern not only in the developing country but also in the world. It is a serious problem because it is causing the deaths of 3.5 million children under 5 years old per- year. Methods: Institution based cross-sectional study design was employed using sample of 342 children selected through systematic simple random sampling technique from May 1st -July30 /2020. Bivariate and multivariate logistic regression analysis was used. The variables which had significant association were identified on the bases of P value<0.05 and AOR 95% CI. Result: The analysis this study revealed that, 42.6% of children were stunted. The main associated factors of stunting were found to be birth order of the child, maternal occupation, frequency meal per day, mother who did not wash their hand before breastfeeding, (AOR=1.636:95%CI:1.00-2.674), children who were not vitamin A, supplemented (AOR=1.901, 95%CI: 1.162-3.109), and child whose mother were not use family planning (AOR=2.916, 95%CI: 1.064-7.989 were associated with outcome variable. Conclusion and recommendation: From the findings of this study, it is concluded that stunting is still an important problem among children aged 6-59 months. Especial attention should be given on intervention of malnutrition.