Ductile crack growth emanating from Sharp Notes in a low Alloy Steel

Stable crack growth behavior emanating from a sharp notch is investigated. Material chosen for tests was EN 34 NiCrMo6 low alloy steel (akin to 4340/4330). Tests were carried out on CT specimens for various angles and ratios to obtain load vs, load-line displacement, Ρ-ΔLL, curves. Experimental results were analyzed. A normalization approach of Ρ-ΔLL curves has been attempted and all experimental curves were represented as a single characteristic curve. Such approach has been also applied on experimental data available from other experimental investigations and results were encouraging, as it may address transferability issue. Fracture surfaces were also examined; crack-front tunneling was obtained using dye penetrant technique to determine extent of stable crack growth. Tests on various notch sizes were also carried out and show that despite more than ten folds increase in notch radius, the maximum load increase recorded for CT was not more than 15%

Utilidad y fiabilidad de las escalas contemporáneas de estimación de riesgo en enfermedades cardiovasculares

Las enfermedades cardiovasculares son la principal causa de morbimortalidad en los países desarrollados. Además, su coste es muy elevado, que, junto con el envejecimiento progresivo de nuestra población, exige estrategias de prevención a fin de contrarrestar sus efectos. En los últimos años, se desarrollaron varias escalas de estratificación de riesgo en el ámbito de las enfermedades cardiovasculares, como el síndrome coronario agudo y las hemorragias derivadas de su manejo; eventos tromboembólicas, a menudo fatales, en la fibrilación auricular, etc… Esas escalas se desarrollaron en poblaciones con perfil de riesgo y sistemas sanitarios diferentes a la nuestra. Así, su utilidad y fiabilidad deben ser examinadas para garantizar que su uso no resulta en estimaciones pronosticas erróneas. En este proyecto de tesis, se pretende evaluar la utilidad y fiabilidad de diferentes escalas contemporáneas de estimación de riesgo en enfermedades cardiovasculares

Triglycerides and Residual Atherosclerotic Risk.

Even when low-density lipoprotein-cholesterol (LDL-C) levels are lower than guideline thresholds, a residual risk of atherosclerosis remains. It is unknown whether triglyceride (TG) levels are associated with subclinical atherosclerosis and vascular inflammation regardless of LDL-C. This study sought to assess the association between serum TG levels and early atherosclerosis and vascular inflammation in apparently healthy individuals. An observational, longitudinal, and prospective cohort study, including 3,754 middle-aged individuals with low to moderate cardiovascular risk from the PESA (Progression of Early Subclinical Atherosclerosis) study who were consecutively recruited between June 2010 and February 2014, was conducted. Peripheral atherosclerotic plaques were assessed by 2-dimensional vascular ultrasound, and coronary artery calcification (CAC) was assessed by noncontrast computed tomography, whereas vascular inflammation was assessed by fluorine-18 fluorodeoxyglucose uptake on positron emission tomography. Atherosclerotic plaques and CAC were observed in 58.0% and 16.8% of participants, respectively, whereas vascular inflammation was evident in 46.7% of evaluated participants. After multivariate adjustment, TG levels ≥150 mg/dl showed an association with subclinical noncoronary atherosclerosis (odds ratio [OR]: 1.35; 95% confidence interval [CI]: 1.08 to 1.68; p = 0.008). This association was significant for groups with high LDL-C (OR: 1.42; 95% CI: 1.11 to 1.80; p = 0.005) and normal LDL-C (OR: 1.85; 95% CI: 1.08 to 3.18; p = 0.008). No association was found between TG level and CAC score. TG levels ≥150 mg/dl were significantly associated with the presence of arterial inflammation (OR: 2.09; 95% CI: 1.29 to 3.40; p = 0.003). In individuals with low to moderate cardiovascular risk, hypertriglyceridemia was associated with subclinical atherosclerosis and vascular inflammation, even in participants with normal LDL-C levels. (Progression of Early Subclinical Atherosclerosis [PESA]; NCT01410318).The PESA study is funded by the National Center for Cardiovascular Research (CNIC) and Santander Bank. The study also has received funding from the Carlos III Health Institute (ISCIII; PI15/02019, PI17/ 00590, and PI20/00819) and the European Regional Development Fund. The CNIC is supported by the ISCIII, the Ministry of Science and Innovation, and the Pro CNIC Foundation. CNIC is a Severo Ochoa Center of Excellence (SEV-2015-0505). The funders had no role in the design and conduct of the study; the collection, management, analysis, and interpretation of the data; the preparation, review, or approval of the manuscript; or the decision to submit the manuscript for publication. Dr. Ibáñez is the recipient of a European Research Council grant MATRIX (ERC-COG-2018-ID: 819775). All other authors have reported that they have no relationships relevant to the contents of this paper to disclose.S

Inter- and intra-rater reliability of the Chicago Classification in pe-diatric high-resolution esophageal manometry recordings

This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving'.Copyright © 2015 John Wiley & Sons, Inc. All rights reserved.Background The Chicago Classification (CC) facilitates interpretation of high-resolution manometry (HRM) recordings. Application of this adult based algorithm to the pediatric population is unknown. We therefore assessed intra and interrater reliability of software-based CC diagnosis in a pediatric cohort. Methods Thirty pediatric solid state HRM recordings (13M; mean age 12.1 ± 5.1 years) assessing 10 liquid swallows per patient were analyzed twice by 11 raters (six experts, five non-experts). Software-placed anatomical landmarks required manual adjustment or removal. Integrated relaxation pressure (IRP4s), distal contractile integral (DCI), contractile front velocity (CFV), distal latency (DL) and break size (BS), and an overall CC diagnosis were software-generated. In addition, raters provided their subjective CC diagnosis. Reliability was calculated with Cohen's and Fleiss’ kappa (κ) and intraclass correlation coefficient (ICC). Key Results Intra- and interrater reliability of software-generated CC diagnosis after manual adjustment of landmarks was substantial (mean κ = 0.69 and 0.77 respectively) and moderate-substantial for subjective CC diagnosis (mean κ = 0.70 and 0.58 respectively). Reliability of both software-generated and subjective diagnosis of normal motility was high (κ = 0.81 and κ = 0.79). Intra- and interrater reliability were excellent for IRP4s, DCI, and BS. Experts had higher interrater reliability than non-experts for DL (ICC = 0.65 vs ICC = 0.36 respectively) and the software-generated diagnosis diffuse esophageal spasm (DES, κ = 0.64 vs κ = 0.30). Among experts, the reliability for the subjective diagnosis of achalasia and esophageal gastric junction outflow obstruction was moderate-substantial (κ = 0.45–0.82). Conclusions & Inferences Inter- and intrarater reliability of software-based CC diagnosis of pediatric HRM recordings was high overall. However, experience was a factor influencing the diagnosis of some motility disorders, particularly DES and achalasia

Pressure-Flow Analysis for the Assessment of Pediatric Oropharyngeal Dysphagia

This is the authors’ version of an article published in Journal of Pediatrics. The original publication is available by subscription at: http://dx.doi.org/10.1016/j.jpeds.2016.06.032 Licensed under the the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. This author accepted manuscript is made available following 12 month embargo from date of publication (1 Aug 2016) in accordance with the publisher's copyright policy.Objectives Pharyngeal High Resolution Manometry with Impedance (HRIM) was performed in a heterogeneous group of children with signs of oropharyngeal dysphagia (OPD). The aim of this study was to determine which objective pressure-impedance measures of pharyngeal swallowing function correlated with clinically assessed severity of OPD symptoms. Study Design Forty five pediatric OPD patients and 34 non-OPD controls were recruited and up to 5 liquid bolus swallows were recorded using a solid state HRIM catheter. Individual measures of pharyngeal and upper esophageal sphincter (UES) function and a Swallow Risk Index composite score were derived for each swallow, and averaged data for OPD patients were compared against those of non-OPD controls. Clinical severity of OPD symptoms and oral feeding competency was based on the validated Dysphagia Disorders Survey (DDS) and Functional Oral Intake Scale. Results Those objective measures that were markers of UES relaxation, UES opening and pharyngeal flow resistance, differentiated patients with and without OPD symptoms. Patients demonstrating abnormally high pharyngeal intra-bolus pressures and high UES resistance, markers of outflow obstruction, were most likely to have overt DDS signs and symptoms (Odds Ratio 9.24, p=0.05, and 9.7, p = 0.016, respectively). Conclusion Pharyngeal motor patterns can be recorded in children using HRIM and pharyngeal function can be objectively defined using pressure-impedance measures. Objective measurements suggest that pharyngeal dysfunction is common in children with clinical signs of OPD. A key finding of this study was evidence of markers of restricted UES opening

Evaluation of optimal medical therapy in acute myocardial infarction patients with prior stroke

Background: Treatment of acute myocardial infarction (AMI) patients with prior stroke is a common clinical dilemma. Currently, the application of optimal medical therapy (OMT) and its impact on clinical outcomes are not clear in this patient population. Methods: We retrieved 765 AMI patients with prior stroke who underwent percutaneous coronary intervention (PCI) during the index hospitalization from the international multicenter BleeMACS registry. All of the subjects were divided into two groups based on the prescription they were given prior to discharge. Baseline characteristics and procedural variables were compared between the OMT and non-OMT groups. Mortality, re-AMI, major adverse cardiovascular events (MACE), and bleeding were followed-up for 1 year. Results: Approximately 5% of all patients presenting with AMI were admitted to the hospital for ischemic stroke. Although the prescription rate of each OMT medication was reasonably high (73.3%-97.3%), 47.7% lacked at least one OMT medication. Patients receiving OMT showed a significantly decreased occurrence of mortality (4.5% vs 15.1%, p < 0.001), re-AMI (4.2% vs 9.3%, p = 0.004), and the composite endpoint of death/re-AMI (8.6% vs 20.5%, p < 0.001) compared to those without OMT. No significant difference was observed between the groups regarding bleeding. After adjusting for confounding factors, OMT was the independent protective factor of 1-year mortality, while age was the independent risk factors. Conclusions: OMT at discharge was associated with a significantly lower 1-year mortality of patients with AMI and prior stroke in clinical practice. However, OMT was provided to just half of the eligible patients, leaving room for substantial improvement

High-resolution esophageal manometry in pediatrics: Effect of esophageal length on diagnostic measures

BACKGROUND: High-resolution esophageal manometry (HREM), derived esophageal pressure topography metrics (EPT), integrated relaxation pressure (IRP), and distal latency (DL) are influenced by age and size. Combined pressure and intraluminal impedance also allow derivation of metrics that define distension pressure and bolus flow timing. We prospectively investigated the effects of esophageal length on these metrics to determine whether adjustment strategies are required for children. METHODS: Fifty-five children (12.3 ± 4.5 years) referred for HREM, and 30 healthy adult volunteers (46.9 ± 3.8 years) were included. Studies were performed using the MMS system and a standardized protocol including 10 × 5 mL thin liquid bolus swallows (SBM kit, Trisco Foods) and analyzed via Swallow Gateway (www.swallowgateway.com). Esophageal distension pressures and swallow latencies were determined in addition to EGJ resting pressure and standard EPT metrics. Effects of esophageal length were examined using partial correlation, correcting for age. Adult-derived upper limits were adjusted for length using the slopes of the identified linear equations. KEY RESULTS: Mean esophageal length in children was 16.8 ± 2.8 cm and correlated significantly with age (r = 0.787, P = .000). Shorter length correlated with higher EGJ resting pressure and 4-s integrated relaxation pressures (IRP), distension pressures, and shorter contraction latencies. Ten patients had an IRP above the adult upper limit. Adjustment for esophageal length reduced the number of patients with elevated IRP to three. CONCLUSIONS & INFERENCES: We prospectively confirmed that certain EPT metrics, as well as potential useful adjunct pressure-impedance measures such as distension pressure, are substantially influenced by esophageal length and require adjusted diagnostic thresholds specifically for children.Maartje M. J. Singendonk, Lara F. Ferris, Lisa McCall, Grace Seiboth, Katie Lowe, David Moore, Paul Hammond, Richard Couper, Rammy Abu, Assi, Charles Cock, Marc A. Benninga, Michiel P. van Wijk, Taher I. Omar

Association of Beta-Blockers with Survival on Patients Presenting with ACS Treated with PCI: A Propensity Score Analysis from the BleeMACS Registry

Purpose: The aim was to evaluate prognostic value of beta-blocker (BB) administration in acute coronary syndromes (ACS) patients in the percutaneous coronary intervention (PCI) era. Methods and Results: The BleeMACS project is a multicenter, observational, retrospective registry enrolling patients with ACS worldwide in 15 hospitals. Patients discharged with BB therapy were compared to those discharged without a BB before and after propensity score with matching. The primary endpoint was all-cause mortality at 1 year. Secondary endpoints included in-hospital reinfarction, in-hospital heart failure, 1-year myocardial infarction, 1-year bleeding and 1-year composite of death and recurrent myocardial infarction. After matching, 2935 patients for each group were enrolled. The primary endpoint of 1-year death was significantly lower in the group on BB therapy (4.5 vs 7%, p < 0.05), while only a trend was noted for recurrent acute myocardial infarction (4.5 vs 4.9%, p = 0.54). These results were consistent for patients older than 80 years of age, for ST-elevation myocardial infarction (STEMI) patients, and for those discharged with complete versus incomplete revascularization, but not for non-STEMI/unstable angina patients. Conclusions: BB therapy was related to 1-year lower risk of all-cause mortality, independently from completeness of revascularization, admission diagnosis, age and ejection fraction. Randomized controlled trials for patients treated with PCI for ACS should be performed