SliceChip: a benchtop fluidic platform for organotypic culture and serial assessment of human and rodent pancreatic slices.

Enzymatically isolated pancreatic islets are the most commonly used ex vivo testbeds for diabetes research. Recently, precision-cut living slices of human pancreas are emerging as an exciting alternative because they maintain the complex architecture of the endocrine and exocrine tissues, and do not suffer from the mechanical and chemical stress of enzymatic isolation. We report a fluidic pancreatic SliceChip platform with dynamic environmental controls that generates a warm, oxygenated, and bubble-free fluidic pathway across singular immobilized slices with continuous deliver of fresh media and the ability to perform repeat serial perfusion assessments. A degasser ensures the system remains bubble-free while systemic pressurization with compressed oxygen ensures slice medium remains adequately oxygenated. Computational modeling of perfusion and oxygen dynamics within SliceChip guide the system's physiomimetic culture conditions. Maintenance of the physiological glucose dependent insulin secretion profile across repeat perfusion assessments of individual pancreatic slices kept under physiological oxygen levels demonstrated the culture capacity of our platform. Fluorescent images acquired every 4 hours of transgenic murine pancreatic slices were reliably stable and recoverable over a 5 day period due to the inclusion of a 3D-printed bioinert metallic anchor that maintained slice position within the SliceChip. Our slice on a chip platform has the potential to expand the useability of human pancreatic slices for diabetes pathogenesis and the development of new therapeutic approaches, while also enabling organotypic culture and assessment of other tissue slices such as brain and patient tumors.

Residents Teaching Residents: Results of an Interdisciplinary Educational Endeavor.

OBJECTIVES: Resident physicians across disciplines are engaged in teaching at multiple levels. Available literature focuses on medical student education and intra-disciplinary teaching. The national shortage of psychiatrists coupled with an increasing mental illness burden necessitates development of creative interdisciplinary collaboration. The authors report on an interdisciplinary, resident-to-resident didactic series assessing whether such a model could improve internal medicine resident comfort with managing psychiatric illness on inpatient medical wards. METHODS: Internal medicine residents were assessed regarding their comfort level with managing certain common inpatient psychiatric presentations before and after the delivery of a teaching curriculum designed and delivered by psychiatry residents. RESULTS: Internal medicine residents' overall confidence with identifying and managing common psychiatric problems on inpatient medical wards improved. Comfort level with managing depression and demoralization and determining decisional capacity both improved to a statistically significant degree. CONCLUSIONS: Collaborative, interdisciplinary care is complex and its benefits can be difficult to assess. Data from this study showed that interdisciplinary teaching at the resident level has the potential to be an effective means for building collaboration and can lead to a subjective improvement in comfort managing common inpatient psychiatric presentations on medical wards. Additionally, qualitative observations suggest that such an intervention can improve interdisciplinary collaboration.

Damage control resuscitation.

The early recognition and management of hemorrhage shock are among the most difficult tasks challenging the clinician during primary assessment of the acutely bleeding patient. Often with little time, within a chaotic setting, and without sufficient clinical data, a decision must be reached to begin transfusion of blood components in massive amounts. The practice of massive transfusion has advanced considerably and is now a more complete and, arguably, more effective process. This new therapeutic paradigm, referred to as damage control resuscitation (DCR), differs considerably in many important respects from previous management strategies for catastrophic blood loss. We review several important elements of DCR including immediate correction of specific coagulopathies induced by hemorrhage and management of several extreme homeostatic imbalances that may appear in the aftermath of resuscitation. We also emphasize that the foremost objective in managing exsanguinating hemorrhage is always expedient and definitive control of the source of bleeding.