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A 77-year-old man with vascular dementia was presented to the emergency department with dyspnea. His medical history included rheumatic mitral stenosis with mechanical mitral valve replacement in 2001. On examination, he was afebrile, jaundiced and euvolemic. On auscultation, a new holosystolic murmur, loudest at the apex was heard. Laboratory investigations revealed low hemoglobin of 89, mean corpuscular volume 98.9, a normal platelet count, undetectable haptoglobin level, and elevated lactate dehydrogenase. A direct antiglobulin test was negative. Numerous schistocytes on peripheral blood smear were seen. A transthoracic echocardiogram showed dehiscence of the prosthetic mitral valve posteriorly, with substantial paravalvular mitral regurgitation not present on echocardiogram 5 months earlier. The patient's left ventricular ejection fraction was 50%-55%. Negative blood cultures, coupled with the absence of fever or other infectious findings, made endocarditis unlikely. The patient was given a diagnosis of macroangiopathic hemolytic anemia secondary to prosthetic valve dehiscence. He was managed conservatively, owing to his poor baseline functional status.

Adenosine boasts promising preclinical and clinical data supporting a vital role in modulating vascular homeostasis. Its widespread use as a diagnostic and therapeutic agent have been limited by its short half‐life and complex biology, though adenosine‐modulators have shown promise in improving vascular healing. Moreover, circulating adenosine has shown promise in predicting cardiovascular (CV) events. We sought to delineate whether circulating plasma adenosine levels predict CV events in patients undergoing invasive assessment for coronary artery disease. Patients undergoing invasive angiography had clinical data prospectively recorded in the Cardiovascular and Percutaneous ClInical TriALs (CAPITAL) revascularization registry and blood samples collected in the CAPITAL Biobank from which adenosine levels were quantified. Tertile‐based analysis was used to assess prediction of major adverse cardiovascular events (MACE; composite of death, myocardial infarction, unplanned revascularization, and cerebrovascular accident). Secondary analyses included MACE subgroups, clinical subgroups and adenosine levels. There were 1,815 patients undergoing angiography who had blood collected with adenosine quantified in 1,323. Of those quantified, 51.0% were revascularized and 7.3% experienced MACE in 12 months of follow‐up. Tertile‐based analysis failed to demonstrate any stratification of MACE rates (log rank, P = 0.83), when comparing low‐to‐middle (hazard ratio (HR) 1.10, 95% confidence interval (CI) 0.68–1.78, P = 0.70) or low‐to‐high adenosine tertiles (HR 0.95, 95% CI 0.56–1.57, P = 0.84). In adjusted analysis, adenosine similarly failed to predict MACE. Finally, adenosine did not predict outcomes in patients with acute coronary syndrome nor in those revascularized or treated medically. Plasma adenosine levels do not predict subsequent CV outcomes or aid in patient risk stratification.

Background Previous studies have demonstrated Aboriginals are less likely to receive a renal transplant in comparison to Caucasians however whether this applies to the entire population or specific subsets remains unclear. We examined the effect of age on renal transplantation in Aboriginals. Methods Data on 30,688 dialysis (Aboriginal 2,361, Caucasian 28, 327) patients obtained between Jan. 2000 and Dec. 2009 were included in the final analysis. Racial status was self-reported. Cox proportional hazards, the Fine and Grey sub-distribution method and Poisson regression were used to determine the association between race, age and transplantation. Results In comparison to Caucasians, Aboriginals were less likely to receive a renal transplant (Adjusted HR 0.66 95% CI 0.57-0.77, P < 0.0001) however after stratification by age and treating death as a competing outcome, the effect was more predominant in younger Aboriginals (Age 18–40: 20.6% aboriginals vs. 48.3% Caucasians transplanted; aHR 0.50(0.39-0.61), p < 0.0001, Age 41–50: 10.2% aboriginals vs. 33.9% Caucasians transplanted; aHR 0.46(0.32-0.64), p = 0.005, Age 51–60: 8.2% aboriginals vs. 19.5% Caucasians transplanted; aHR0.65(0.49-0.88), p = 0.01, Age >60: 2.7% aboriginals vs. 2.6% Caucasians transplanted; aHR 1.21(0.76-1.91), P = 0.4, Age X race interaction p < 0.0001). Both living and deceased donor transplants were lower in Aboriginals under the age of 60 compared to Caucasians. Conclusion Younger Aboriginals are less likely to receive a renal transplant compared to their Caucasian counterparts, even after adjustment for comorbidity. Determination of the reasons behind these discrepancies and interventions specifically targeting the Aboriginal population are warranted.

Background Many free-form-text referral requisitions for transthoracic echocardiography (TTE) provide insufficient information to adequately evaluate their adherence to Appropriate Use Criteria (AUC). We developed a structured referral requisition algorithm based on requisition deficiencies identified retrospectively in a derivation cohort of 1303 TTE referrals and evaluated the performance of the algorithm in a consecutive series of cardiology outpatient referrals. Methods The validation cohort comprised 286 consecutive TTE outpatient cardiology referrals over a 2-week period. The relevant AUC indication was identified from information extracted from the free-form-text requisition. The structured referral algorithm was applied prospectively to the same cohort using information from the free-form-text requisition, electronic medical record and ordering clinicians. Referrals were classified as appropriate, uncertain, non-adherent (inappropriate) or unclassifiable based on the American College of Cardiology Foundation 2011 AUC. Results Only 28.7 % of free-form-text requisitions provided adequate information to identify the relevant AUC indication, as compared to 94.4 % of referrals using the structured referral algorithm ( p  < 0.001). The structured algorithm improved identification in the AUC categories of general evaluation of cardiac structure/function (100 % vs. 43.0 %, p  < 0.001); valvular function (100 % vs. 23.0 %, p  < 0.001); hypertension, heart failure or cardiomyopathy (100 % vs. 20.3 %, p  < 0.001); and adult congenital heart disease (100 % vs. 0 %, p  < 0.001). By applying the algorithm, the number of identifiable non-adherent studies increased from 2.6 to 10.4 % ( p <0.001). Conclusions Use of a structured TTE referral algorithm, as opposed to a free-form-text requisition, allowed the vast majority of referrals to be monitored for AUC adherence and facilitated the identification of potentially inappropriate referrals.

In this work we consider the long-time behaviour of dissipative evolution equations; in particular, the construction of Approximate Inertial Manifolds (AIMs) for the Ginzburg-Landau equation (GLE) and their subsequent application to the creation of more efficient and more accurate numerical schemes. In the first part, the time analyticity for the solutions of a class of dissipative evolution equations is shown. This class includes Reaction-Diffusion, GLE, Navier-Stokes, and Cahn-Hilliard equations. Existing methods are generalized and extended, and it is shown that the solutions of these equations have a unique analytic extension to an infinite pencil-shaped domain about the positive real axis in the complex plane. Moreover, in the space-periodic case, the solutions are shown to be in a Gevrey class, to be${\\cal C}\\sp\\infty$in the space variable, and to have exponential decay of the Fourier coefficients. In the second part, the preceding result is applied to develop a new method of construction of AIMs which produces an infinite series of increasingly higher order AIMs for the GLE and associates with each a thin neighborhood into which the orbits enter in finite time and with exponential speed. These manifolds are a substitute for Inertial Manifolds when the existence of the Inertial Manifold is not known and are shown to localize the universal attractor in the phase space. The method of construction is general and can be applied to other equations. Finally, in the third part, using the explicit non-linear equations of the first two nontrivial AIMs, two new numerical schemes are implemented for the GLE, as well as a traditional, linear Galerkin scheme. Comparisons of the accuracy of these three schemes are made, showing gains in stability and accuracy.

Reductions of the self-consistent mean field theory model of amphiphilic molecules in solvent can lead to a singular family of functionalized Cahn-Hilliard energies. We modify these energies, mollifying the singularities to stabilize the computation of the gradient flows and develop a series of benchmark problems that emulate the \"morphological complexity\" observed in experiments. These benchmarks investigate the delicate balance between the rate of absorption of amphiphilic material onto an interface and a least energy mechanism to disperse the arriving mass. The result is a trichotomy of responses in which two-dimensional interfaces either lengthen by a regularized motion against curvature, undergo pearling bifurcations, or split directly into networks of interfaces. We evaluate a number of schemes that use second order BDF2-type time stepping coupled with Fourier pseudo-spectral spatial discretization. The BDF2-type schemes are either based on a fully implicit time discretization with a PSD nonlinear solver, or upon IMEX, SAV, ETD approaches. All schemes use a fixed local truncation error target with adaptive time-stepping to achieve the error target. Each scheme requires proper \"preconditioning\" to achieve robust performance that can enhance efficiency by several orders of magnitude.