A Review of IgG4-related Sclerosing Cholangitis (IgG4-SC).

IgG4-related sclerosing cholangitis (IgG4-SC) is a unique, steroid-responsive, fibroinflammatory condition that is more commonly found in older men and is strongly associated with autoimmune pancreatitis (AIP). It may pose a diagnostic challenge at times due to closely mimicking hepatobiliary diseases such as primary sclerosing cholangitis (PSC), secondary sclerosing cholangitis (SSC), and cholangiocarcinoma. IgG4-SC has an excellent prognosis when promptly diagnosed and treated with steroids. Literature search strategy: The authors searched PubMed and Google Scholar, for articles with the search terms "autoimmune cholangiopathy" and "IgG4 cholangiopathy."

Disseminated histoplasmosis in an HIV/AIDS transgender male-to-female with atypical and persistent GI manifestations.

Disseminated histoplasmosis is a rare complication of infection due to Histoplasma capsulatum. Typically, histoplasmosis is self-limiting and asymptomatic in infected individuals with immunocompetence. Disseminated disease, however, can arise in high-risk populations with primary or acquired cellular immunodeficiency including HIV/AIDS, transplant recipients, and those undergoing immunosuppressive therapy. Here we describe a unique case of extrapulmonary gastrointestinal histoplasmosis by infiltrative Peyer's patch disease with bone marrow involvement in a transgender HIV-infected woman.

Copper Deficiency-Induced Neuropathy After Bariatric Surgery Disguised as Demyelinating Disease: A Case Report.

Neuropathy may arise from many different etiologies - from diabetes and nerve compression to viral infections and chemotherapy side effects; many patients suffer from neuropathic symptoms. While some etiologies produce irreversible neuropathy, others, such as vitamin and mineral deficiencies, lead to a possibly reversible disease process once treated. General clinicians should strive for early and prompt diagnosis of copper deficiency neuropathy whenever possible, especially in patients with normal vitamin B12 levels who present with a subacute gait disorder or prominent sensory ataxia. We present a case of a 73-year-old female with a surgical history of Roux-en-Y gastric bypass (RYGB) 20 years prior, who presented with difficulty with ambulation due to sensory ataxia and bilateral, ascending, sensory neuropathy, who was diagnosed with acquired copper deficiency-induced myeloneuropathy.

Racial Disparities in COVID-19 Hospitalization and In-hospital Mortality at the Height of the New York City Pandemic.

OBJECTIVES: Investigate whether or not race is associated with differences in hospitalization and survival to discharge among patients with coronavirus disease-2019 (COVID-19) at the height of the pandemic in New York City (NYC). METHODS: Single-center retrospective cohort study of COVID-19 patients hospitalized at our university-affiliated NYC hospital from 3/10/20 through 4/13/20 with follow-up to 5/1/20. Our primary endpoint was hospitalization rate among patients with confirmed COVID-19 compared with the regional population based on race. Our secondary endpoint survival to discharge among hospitalized COVID-19 patients. NYC Department of Health data were used to calculate hospitalization odds ratios. Chi-square and t tests were used to compare categorial and continuous variables, respectively. Cox proportional hazards regression and predictive analysis were used to investigate our endpoints further. RESULTS: Our cohort of 734 patients included 355 women (48.4%), 372 Blacks (50.7%), 214 Whites (29.2%), and 92 Hispanics (12.5%) in our analysis. Blacks were nearly twice as likely as Whites to require hospitalization for COVID-19 (OR 1.89, 95% CI, 1.59-2.24, p < 0.001). Hispanics were also more likely to suffer in-hospital mortality from COVID-19 compared with Whites (HR 1.84; 95% CI 1.21-2.80; p = 0.005). There was a non-significant increased hazard of in-hospital mortality among Blacks when compared with Whites (HR, 1.30; 95% CI, 0.95-1.78; p = 0.09). CONCLUSIONS AND RELEVANCE: Blacks were more likely than Whites to require hospitalization for COVID-19 while Hispanics were more likely to experience in-hospital mortality. Further investigation into the socioeconomic factors underlying racial disparities in COVID-19 survival and severity requiring hospitalization is needed on a national scale.

Evaluation of Metabolic and Synaptic Dysfunction Hypotheses of Alzheimer's Disease (AD): A Meta-Analysis of CSF Markers.

BACKGROUND: Alzheimer's disease (AD) is currently incurable and a majority of investigational drugs have failed clinical trials. One explanation for this failure may be the invalidity of hypotheses focusing on amyloid to explain AD pathogenesis. Recently, hypotheses which are centered on synaptic and metabolic dysfunction are increasingly implicated in AD. OBJECTIVE: Evaluate AD hypotheses by comparing neurotransmitter and metabolite marker concentrations in normal versus AD CSF. METHODS: Meta-analysis allows for statistical comparison of pooled, existing cerebrospinal fluid (CSF) marker data extracted from multiple publications, to obtain a more reliable estimate of concentrations. This method also provides a unique opportunity to rapidly validate AD hypotheses using the resulting CSF concentration data. Hubmed, Pubmed and Google Scholar were comprehensively searched for published English articles, without date restrictions, for the keywords "AD", "CSF", and "human" plus markers selected for synaptic and metabolic pathways. Synaptic markers were acetylcholine, gamma-aminobutyric acid (GABA), glutamine, and glycine. Metabolic markers were glutathione, glucose, lactate, pyruvate, and 8 other amino acids. Only studies that measured markers in AD and controls (Ctl), provided means, standard errors/deviation, and subject numbers were included. Data were extracted by six authors and reviewed by two others for accuracy. Data were pooled using ratio of means (RoM of AD/Ctl) and random effects meta-analysis using Cochrane Collaboration's Review Manager software. RESULTS: Of the 435 identified publications, after exclusion and removal of duplicates, 35 articles were included comprising a total of 605 AD patients and 585 controls. The following markers of synaptic and metabolic pathways were significantly changed in AD/controls: acetylcholine (RoM 0.36, 95% CI 0.24-0.53, p<0.00001), GABA (0.74, 0.58-0.94, p<0.01), pyruvate (0.48, 0.24-0.94, p=0.03), glutathione (1.11, 1.01- 1.21, p=0.03), alanine (1.10, 0.98-1.23, p=0.09), and lower levels of significance for lactate (1.2, 1.00-1.47, p=0.05). Of note, CSF glucose and glutamate levels in AD were not significantly different than that of the controls. CONCLUSION: This study provides proof of concept for the use of meta-analysis validation of AD hypotheses, specifically via robust evidence for the cholinergic hypothesis of AD. Our data disagree with the other synaptic hypotheses of glutamate excitotoxicity and GABAergic resistance to neurodegeneration, given observed unchanged glutamate levels and decreased GABA levels. With regards to metabolic hypotheses, the data supported upregulation of anaerobic glycolysis, pentose phosphate pathway (glutathione), and anaplerosis of the tricarboxylic acid cycle using glutamate. Future applications of meta-analysis indicate the possibility of further in silico evaluation and generation of novel hypotheses in the AD field.

A tick-acquired red meat allergy.

Allergic reaction is a common clinical picture in the Emergency Department (ED). Most allergic reactions are from food or drugs. A detailed history is an integral aspect of determining the causative agent of an allergy. Galactose-alpha-1,3-galactose (alpha-gal) allergy is a tick-acquired red meat allergy that causes delayed-onset allergic reaction or anaphylaxis due to molecular mimicry. Alpha-gal allergy may not be widely known as a cause of allergic reactions. Lack of universal awareness of this phenomenon in the ED and Urgent Care setting could lead to misdiagnosis, or delayed diagnosis. Subsequently, lack of proper instruction to avoid red meat could put patients at risk for future attacks with morbidity or mortality. We report three cases of allergic reaction presumed from red meat consumption secondary to alpha-gal allergy.