A Microphysiological Model of Progressive Human Hepatic Insulin Resistance.

Background & Aims: Hepatic insulin resistance is a fundamental phenomenon observed in both Type 2 diabetes (T2D) and metabolic (dysfunction) associated fatty liver disease (MAFLD). The relative contributions of nutrients, hyperinsulinemia, hormones, inflammation, and other cues are difficult to parse as they are convoluted by interplay between the local and systemic events. Here, we used a well-established human liver microphysiological system (MPS) to establish a physiologically-relevant insulin-responsive metabolic baseline and probe how primary human hepatocytes respond to controlled perturbations in insulin, glucose, and free fatty acids (FFAs).

Delivering the news of an intraoperative death; literature-based guidance from the American Association for Thoracic Surgery Wellness Committee.

Objectives: Fortunately, operating room deaths and unexpected deaths are infrequent occurrences. However, when they occur, the surgeon is called upon to deliver this news to family and loved ones. There is a paucity of literature on this topic and little guidance preparing cardiothoracic surgeons for this important but difficult situation.

Personal Relationships and Well-being for Cardiothoracic Surgeons.

This article summarizes relevant research on relational psychology and interpersonal neurobiology and how it applies to cardiothoracic surgeons, their partners and their children. It also provides a synopsis of data retrieved from a well-being survey of cardiothoracic surgeons in the AATS, as well as a separate survey of the well-being experiences of their significant others. Additionally, the article makes recommendations for improving the well-being of cardiothoracic surgeons, as well as their relationships with their partners and children.

Evaluation of ventricular-vascular coupling with critical care metrics: An in silico approach.

Mean arterial pressure and cardiac output provide insufficient guidance for the management of intraoperative hypotension (IOH). In silico models offer additional insights into acute changes in hemodynamic parameters that may be encountered during IOH. A computational model (CM) generated parameters quantifying ventricular-vascular coupling, and pressure-volume construct across levels of aortic compliance (C ).

Immunomodulatory contribution of mast cells to the regenerative biomaterial microenvironment.

Bioactive immunomodulatory biomaterials have shown promise for influencing the immune response to promote tissue repair and regeneration. Macrophages and T cells have been associated with this response; however, other immune cell types have been traditionally overlooked. In this study, we investigated the role of mast cells in the regulation of the immune response to decellularized biomaterial scaffolds using a subcutaneous implant model.

Intraosseous Lipoma: An Elusive Cause of Long Bone Pain: A Case Series.

Introduction: Intraosseous lipomas are benign tumors composed of mature fat that reside within the intramedullary canal. Although many cases are asymptomatic, some patients report pain that interferes with daily living. For patients presenting with refractory pain, surgical excision may be performed.

Well-being of Cardiothoracic Surgeons in the Time of COVID-19: A Survey by the Wellness Committee of the American Association for Thoracic Surgery.

The prevalence of burnout among physicians has been increasing over the last decade, but data on burnout in the specialty of cardiothoracic surgery are lacking. We aimed to study this topic through a well-being survey. A 54-question well-being survey was developed by the Wellness Committee of the American Association for Thoracic Surgery (AATS) and sent by email from January through March of 2021 to AATS members and participants of the 2021 annual meeting.

Preventing post-surgical cardiac adhesions with a catechol-functionalized oxime hydrogel.

Post-surgical cardiac adhesions represent a significant problem during routine cardiothoracic procedures. This fibrous tissue can impair heart function and inhibit surgical access in reoperation procedures. Here, we propose a hydrogel barrier composed of oxime crosslinked poly(ethylene glycol) (PEG) with the inclusion of a catechol (Cat) group to improve retention on the heart for pericardial adhesion prevention.

Computational Decision Support for the COVID-19 Healthcare Coalition.

The COVID-19 Healthcare Coalition was established as a private sector-led response to the COVID-19 pandemic. Its purpose was to bring together healthcare organizations, technology firms, nonprofits, academia, and startups to preserve the healthcare delivery system and help protect U.S.

Embryo donation: Survey of in-vitro fertilization (IVF) patients and randomized trial of complimentary counseling.

Design: This study surveyed patients with stored frozen embryos and developed and tested an intervention through a randomized trial to support subjects to consider embryo disposition options (EDOs), especially donation for family building.

Methods: Based on a review of literature on EDOs, the authors developed and mailed a 2-page anonymous survey to 1,053 patients in Massachusetts (USA) to elicit their feelings about their stored embryos. Target patients had embryos cryopreserved for ≥1 year and had not indicated an EDO.

Whole Brain Leadership for Creating Resonant Multidisciplinary Health Care Teams.

The culture of health care creates important challenges for health care professionals. In particular, we work in a culture that is (1) hierarchical, (2) competitive, and (3) perfectionistic. Unfortunately, the consequence of acquiescing to those demands is contrary to promoting Resonant teamwork, and it is important for leaders of multidisciplinary teams to understand how to create environments that flatten the hierarchy (by encouraging all members of the team to contribute; and to genuinely seek the wisdom and knowledge of their colleagues), that encourage collaboration and cooperation (emphasizing collective wins and losses both for the immediate team as well as for all of us, as a profession), and that invites excellence (which is a process) versus expectation of perfection (which is an unrealistic outcome).

Integration of leadership training for graduate and medical students engaged in translational biomedical research: Examining self-efficacy and self-insight.

Introduction: Formal training in team leadership is not taught in biomedical research graduate training programs or medical schools.

Methods: We piloted a Leadership Training Workshop for graduate biomedical and medical students enrolled in our Interprofessional Research Design Course.

Results: The Kane-Baltes self-efficacy survey demonstrated improved leadership skills (median scores pretraining and post-training were 71 and 76.

Self-Assembled Colloidal Gel Using Cell Membrane-Coated Nanosponges as Building Blocks.

Colloidal gels consisting of oppositely charged nanoparticles are increasingly utilized for drug delivery and tissue engineering. Meanwhile, cell membrane-coated nanoparticles are becoming a compelling biomimetic system for innovative therapeutics. Here, we demonstrate the successful use of cell membrane-coated nanoparticles as building blocks to formulate a colloidal gel that gelates entirely based on material self-assembly without chemical cross-linking.

Enzyme-Targeted Nanoparticles for Delivery to Ischemic Skeletal Muscle.

The targeted delivery of enzyme-responsive nanoparticles to specific tissues can be a valuable, minimally invasive approach for imaging or drug delivery applications. In this study, we show for the first time enzyme-directed assembly of intravenously (IV) delivered nanoparticles in ischemic skeletal muscle, which has applications for drug delivery to damaged muscle of the type prevalent in peripheral artery disease (PAD). Specifically, micellar nanoparticles are cleavable by matrix metalloproteinases (MMPs), causing them to undergo a morphological switch and thus aggregate in tissues where these enzymes are upregulated, like ischemic muscle.

Engineering an Injectable Muscle-Specific Microenvironment for Improved Cell Delivery Using a Nanofibrous Extracellular Matrix Hydrogel.

Injection of skeletal muscle progenitors has the potential to be a minimally invasive treatment for a number of diseases that negatively affect vasculature and skeletal muscle, including peripheral artery disease. However, success with this approach has been limited because of poor transplant cell survival. This is primarily attributed to cell death due to extensional flow through the needle, the harsh ischemic environment of the host tissue, a deleterious immune cell response, and a lack of biophysical cues supporting exogenous cell viability.

Extracellular Matrix Hydrogel Promotes Tissue Remodeling, Arteriogenesis, and Perfusion in a Rat Hindlimb Ischemia Model.

Objective: This study aimed to examine acellular extracellular matrix based hydrogels as potential therapies for treating peripheral artery disease (PAD). We tested the efficacy of using a tissue specific injectable hydrogel, derived from decellularized porcine skeletal muscle (SKM), compared to a new human umbilical cord derived matrix (hUC) hydrogel, which could have greater potential for tissue regeneration because of its young tissue source age.

Background: The prevalence of PAD is increasing and can lead to critical limb ischemia (CLI) with potential limb amputation.

Fabrication and characterization of injectable hydrogels derived from decellularized skeletal and cardiac muscle.

Biomaterials, which can contain appropriate biomechanical and/or biochemical cues, are increasingly being investigated as potential scaffolds for tissue regeneration and/or repair for treating myocardial infarction, heart failure, and peripheral artery disease. Specifically, injectable hydrogels are touted for their minimally invasive delivery, ability to self-assemble in situ, and capacity to encourage host tissue regeneration. Here we present detailed methods for fabricating and characterizing decellularized injectable cardiac and skeletal muscle extracellular matrix (ECM) hydrogels.

Concise review: injectable biomaterials for the treatment of myocardial infarction and peripheral artery disease: translational challenges and progress.

Recently, injectable biomaterial-based therapies for cardiovascular disease have been gaining attention, because they have shown therapeutic potential in preclinical models for myocardial infarction (MI) and peripheral artery disease (PAD). Naturally derived (e.g.

Human versus porcine tissue sourcing for an injectable myocardial matrix hydrogel.

Heart failure (HF) after myocardial infarction (MI) is a leading cause of death in the western world with a critical need for new therapies. A previously developed injectable hydrogel derived from porcine myocardial matrix (PMM) has had successful results in both small and large animal MI models. In this study, we sought to evaluate the impact of tissue source on this biomaterial, specifically comparing porcine and human myocardium sources.

Marijuana: still a "signal of misunderstanding".

This article reviews four decades of my professional experience with marijuana, including: 1) my treatment of marijuana-dependent patients, particularly adolescents; 2) my research on the general effects and medical uses of the government-grown marijuana and of oral tetrahydrocannabinol (Marinol); and 3) my social policy experiences, both nationally and internationally, as a member of the National Commission on Marijuana Drug Abuse. The article emphasizes the mythology, morality, and misunderstanding that clouds so much of the thinking about marijuana in general and its medical utility in particular.

Intergroup study of fluorouracil plus levamisole as adjuvant therapy for stage II/Dukes' B2 colon cancer.

Purpose: To determine the effectiveness of fluorouracil plus levamisole administered postoperatively to patients with resected stage II (Dukes' B2) colon cancer.

Patients And Methods: This randomized controlled clinical trial (INT-0035) was performed by National Cancer Institute-sponsored cancer clinical trials cooperative groups. Patients were assigned to observation only or to fluorouracil (450 mg/m2 intravenously [IV] daily for 5 days and, beginning at 28 days, weekly for 48 weeks) plus levamisole (50 mg orally three times daily for 3 days repeated every 2 weeks for 1 year).