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A Review of Techniques for RSS-Based Radiometric Partial Discharge Localization.
The value of the cardio-ankle vascular index (CAVI) increases with age. All large-scale studies of the CAVI have investigated patients less then 80 years old. Thus, the clinical characteristics of high CAVI in patients aged 80 or more remain unclear. Therefore, we investigated (1) the CAVI in very elderly patients and (2) the determinants of a high CAVI in high-risk patients, including very elderly patients. The Cardiovascular Prognostic Coupling Study in Japan (Coupling Registry) is a prospective observational study of Japanese outpatients with any cardiovascular risk factors. We enrolled 5109 patients from 30 institutions (average age 68.7 ± 11.4 years, 52.4% males). We investigated the determinants of the CAVI by separating the patients into three groups 970 middle-aged ( less then 60 years), 3252 elderly (60-79 years), and 887 very elderly (≥80 years) patients. The CAVI values of the males were significantly higher those of the females in all age groups ( less then 60 years 7.81 ± 1.11 vs. 7.38 ± 0.99, P less then .001; 60-79 years 9.20 ± 1.29 vs. 8.66 ± 1.07, P less then .001; ≥80 years 10.26 ± 1.39 vs. 9.51 ± 1.12, P less then .001). In all age groups, the CAVI of the patients with diabetes/glucose tolerance disorder was higher than that of the patients without diabetes/glucose tolerance disorder ( less then 60 years 7.82 ± 1.22 vs 7.58 ± 1.03, P = .002; 60-79 years 9.23 ± 1.20 vs 8.78 ± 1.19, P less then .001; ≥80 years 10.04 ± 1.24 vs 9.75 ± 1.32, P = .002). The determinants of the CAVI in these very elderly patients were age, male sex, low BMI, and mean blood pressure. GSK503 Diabetes/glucose tolerance disorder and glucose were independently associated with the CAVI in the patients aged less then 60 years and 60-79 years, but not in those aged ≥80 years after adjusting for other covariates.Background Pulmonary vein isolation (PVI) is the mainstay of catheter ablation (CA) for paroxysmal atrial fibrillation (AF). However, for persistent and long-standing persistent AF, there are no established strategies to improve the success rate of CA. Despite studies indicating that prophylactic cavotricuspid isthmus (CTI) ablation provides no or limited incremental benefit in patients with AF, it is still routinely performed worldwide. Objective We sought to examine whether CTI ablation for AF is associated with improvement in recurrence of all-atrial arrhythmias, compared to PVI alone in patients with and without typical atrial flutter (AFL). Methods A systematic review of PubMed, Cochrane, and Embase was performed for clinical studies including AF patients, reporting outcomes of CTI+PVI versus PVI alone. The primary efficacy endpoint was recurrence-rate of all-atrial arrhythmias. Results Five studies comprising 1400 patients undergoing CTI+PVI versus PVI alone were included; 1110 patients had AF without AFL, and 290 patients had coexistent AF and AFL. After a mean follow-up of 14.4±4.8 months, CTI+PVI was not associated with improvement in recurrence of all-atrial arrhythmias when compared to PVI alone (Risk Ratio [RR] 1.29, 95% Confidence Interval [CI] 0.93-1.79, p=0.13). In the subgroup analysis, there were no differences between both groups in patients with AF without AFL (RR 1.55, 95% CI 0.96-2.48, p=0.07), and in patients with AF and AFL (RR 0.91, 95% CI 0.6-1.39, p=0.68). Conclusion In AF patients, irrespective of the presence of typical AFL, additional CTI ablation is not associated with improvement in recurrence of all-atrial arrhythmias, compared to PVI alone. This article is protected by copyright. All rights reserved.Islet yield is an important predictor of acceptable glucose control after total pancreatectomy with islet autotransplantation (TP-IAT). We assessed if pancreas volume calculated with preoperative MRI could assess islet yield and postoperative outcomes. We reviewed dynamic MRI studies from 154 adult TP-IAT patients (2009-2016), and associations between calculated volumes and digest islet equivalents (IEQs) were tested. In multivariate regression analysis, pancreas volume (P less then .001) and preoperative HbA1c levels (P = .009) were independently associated with digest IEQs. The IEQ prediction formula was calculated according to each preoperative HbA1c level, (a) pancreas volume × 5800 for HbA1c ≥ 6.5, (b) pancreas volume × 10 000 for HbA1c ≥5.7/ less then 6.5 and (iii) pancreas volume × 11 400 for HbA1c less then 5.7. The formula was internally validated with 28 TP-IAT patients between 2017 and 2018 (r2 = .657 and r2 = .710 when restricted to 24 patients without prior pancreatectomy). An estimated IEQs/Body Weight (kg) ≥3700 predicted HbA1c ≤6.5 and insulin independence at 1 year after TP-IAT with 77% and 88% sensitivity and 55% and 43% specificity, respectively. The combination of pancreas volume and preoperative HbA1c levels may be useful to estimate islet yield. Estimated IEQs were reasonably sensitive to predict acceptable glucose control at 1 year.Myelin sheaths, which insulate the axons and ensure saltatory conduction of the nerve impulse, are generated and maintained via largely uncharacterized mechanisms. Ermin is an oligodendrocyte-specific protein associated with the cytoskeleton, but how it regulates cytoskeletal remodeling during oligodendrocyte differentiation and its role in myelin maintenance are not clear. To address this, we generated mice constitutively deficient for Ermn, the Ermin-coding gene. We found that aged Ermn-knockout mice exhibit an aberrant myelin architecture, with splitting of myelin layers, peeling of the myelin sheath from axons, and breakdown of myelinated fibers. As a result, these mice had remarkably impaired motor coordination. Ermn knockout also accelerated cuprizone-induced demyelination and exacerbated the associated movement disorders. Ermin was found to contribute to oligodendrocyte morphogenesis by associating with the myosin phosphatase Rho interacting protein (Mprip/p116RIP ) and inactivating RhoA, a GTPase that controls cytoskeletal rearrangement in differentiating cells. These findings provide novel insights into the mechanisms regulating oligodendroglial differentiation, the maintenance of the myelin sheaths, and remyelination.
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