An Evasive Liver Mass in a Human Immunodeficiency Virus (HIV)-Positive Patient.

IgG4-related disease (IgG4-RD) is an autoimmune syndrome that is characterized by elevated levels of serum IgG4 and infiltration of various tissue types by IgG4 immunoreactive plasma cells. The IgG4-RD can result in systemic disease and the formation of inflammatory mass lesions, frequently addressed as pseudotumors. While IgG4-RD can manifest in various organs, liver involvement is rare, and because it is an immune-mediated inflammatory process, it is uncommon in patients who are immunocompromised. Furthermore, despite IgG4-RD responding well to immunosuppressive treatment, cases of spontaneous remission are exceedingly rare in the literature. In this report, we present the unique case of a self-resolving IgG4-RD lesion of the liver in a HIV positive patient.

Angioedema in the emergency department: an evidence-based update.

Angioedema is a histamine- or bradykinin-mediated response that can be acquired, hereditary, or idiopathic. Manifestations include nonpitting edema of the subcutaneous layer of the skin or submucosal layers of the respiratory or gastrointestinal tracts. While acute presentations are typically transient and localized, angioedema can result in acute airway compromise, requiring immediate stabilization. It can also result in abdominal pain that is commonly misdiagnosed, resulting in unnecessary and potentially harmful procedures. This review assesses current literature on the etiology and management of angioedema in the emergency department. An analysis of the most recent evidence on therapeutic options is provided, while addressing barriers to use.

Procedural sedation and analgesia in the emergency department.

Procedural sedation is a common procedure performed in the emergency department and is a fundamental skill for emergency clinicians. With a wide variety of procedures and patient populations, procedural sedation can be systematically tailored to individual patients' needs, in order to optimize safety and efficacy. This evidence-based review distinguishes the various levels of sedation, provides insight on which patients are appropriate for procedural sedation, lists adjuncts that should be used, and reviews considerations for special populations. The differences between the most frequently utilized medications are presented, as well as a discussion of documentation requirements and discharge criteria.

Reconstitution and characterization of budding yeast gamma-tubulin complex.

Nucleation of microtubules is central to assembly of the mitotic spindle, which is required for each cell division. gamma-Tubulin is a universal component essential for microtubule nucleation from centrosomes. To elucidate the mechanism of microtubule nucleation in budding yeast we reconstituted and characterized the yeast gamma-tubulin complex (Tub4p complex) produced in insect cells. The recombinant complex has the same sedimentation coefficient (11.6 S) as the native complex in yeast cell extracts and contains one molecule of Spc97p, one molecule of Spc98p, and two molecules of Tub4p. The reconstituted Tub4p complex binds preformed microtubules and has a low nucleating activity, allowing us to begin a detailed analysis of conditions that enhance this nucleating activity. We tested whether binding of the recombinant Tub4p complex to the spindle pole body docking protein Spc110p affects its nucleating activity. The solubility of recombinant Spc110p in insect cells is improved by coexpression with yeast calmodulin (Cmd1p). The Spc110p/Cmd1p complex has a small sedimentation coefficient (4.2 S) and a large Stokes radius (14.3 nm), indicative of an elongated structure. The Tub4p complex binds Spc110p/Cmd1p via Spc98p and the K(d) for binding is 150 nM. The low nucleation activity of the Tub4p complex is not enhanced when it is bound to Spc110p/Cmd1p, suggesting that it requires additional components or modifications to achieve robust activity. Finally, we report the identification of a large 22 S Tub4p complex in yeast extract that contains multimers of Spc97p similar to gamma-tubulin ring complexes found in higher eukaryotic cells.