White adipose tissue (WAT), once regarded as morphologically and functionally bland, is now recognized to be dynamic, plastic, heterogenous, and involved in a wide array of biological processes including energy homeostasis, glucose and lipid handling, blood pressure control, and host defense 1 . High fat feeding and other metabolic stressors cause dramatic changes in adipose morphology, physiology, and cellular composition 1 , and alterations in adiposity are associated with insulin resistance, dyslipidemia, and type 2 diabetes (T2D) 2 . Here, we provide detailed cellular atlases of human and murine subcutaneous and visceral white fat at single cell resolution across a range of body weight. We identify subpopulations of adipocytes, adipose stem and progenitor cells (ASPCs), vascular, and immune cells and demonstrate commonalities and differences across species and dietary conditions. We link specific cell types to increased risk of metabolic disease, and we provide an initial blueprint for a comprehensive set of interactions between individual cell types in the adipose niche in leanness and obesity. These data comprise an extensive resource for the exploration of genes, traits, and cell types in the function of WAT across species, depots, and nutritional conditions.

Autologous, abdominal-based reconstructions had the highest satisfaction rates across all four groups. After logistic regression analysis, differences in patient satisfaction between pedicle TRAM and DIEP flap reconstruction were no longer observed. Discussing satisfaction outcomes with patients will help them make educated decisions about breast reconstruction.

Abstract. Oxygenation measurements are widely used in patient care. However, most clinically available instruments currently consist of contact probes that only provide global monitoring of the patient (e.g., pulse oximetry probes) or local monitoring of small areas (e.g., spectroscopy-based probes). Visualization of oxygenation over large areas of tissue, without a priori knowledge of the location of defects, has the potential to improve patient management in many surgical and critical care applications. In this study, we present a clinically compatible multispectral spatial frequency domain imaging (SFDI) system optimized for surgical oxygenation imaging. This system was used to image tissue oxygenation over a large area (16×12 cm) and was validated during preclinical studies by comparing results obtained with an FDA-approved clinical oxygenation probe. Skin flap, bowel, and liver vascular occlusion experiments were performed on Yorkshire pigs and demonstrated that over the course of the experiment, relative changes in oxygen saturation measured using SFDI had an accuracy within 10% of those made using the FDA-approved device. Finally, the new SFDI system was translated to the clinic in a firstin-human pilot study that imaged skin flap oxygenation during reconstructive breast surgery. Overall, this study lays the foundation for clinical translation of endogenous contrast imaging using SFDI. C 2011 Society of Photo-Optical Instrumentation Engineers (SPIE).

The use of tissue oximetry has decreased the authors' flap loss rate and improved the flap salvage rate in microsurgical breast reconstruction. This device is a useful adjunct in flap monitoring during the postoperative period, as it may help decrease flap loss by detecting impending vascular compromise before it becomes clinically evident.