scholarly journals On Cylindrical Graph Construction and its Applications

10.37236/4609 ◽  
2016 ◽  
Vol 23 (1) ◽  
Author(s):  
Amir Daneshgar ◽  
Mohsen Hejrati ◽  
Meysam Madani
Keyword(s):  
Replacement Procedure ◽  
Edge Replacement

In this article we introduce the cylindrical construction, as an edge-replacement procedure admitting twists on both ends of the hyperedges, generalizing the concepts of lifts and Pultr templates at the same time. We prove a tensor-hom duality for this construction and we show that not only a large number of well-known graph constructions are cylindrical but also the construction and its dual give rise to some new graph constructions, applications and results. To show the applicability of the main duality we introduce generalized Grötzsch, generalized Petersen-like and Coxeter-like graphs and we prove some coloring properties of these graphs.

scholarly journals AB0224 ASSOCIATIONS BETWEEN JOINT REPLACEMENT HISTORY AND CYCLIC CITRULLINATED PEPTIDE ANTIBODY TITERS IN RHEUMATOID ARTHRITIS PATIENTS

2020 ◽  
Vol 79 (Suppl 1) ◽  
pp. 1412.2-1412
Author(s):  
M. Sato ◽  
M. Takemura
Keyword(s):  
Rheumatoid Arthritis ◽  
Joint Replacement ◽  
Disease Duration ◽  
Certolizumab Pegol ◽  
Biologic Agent ◽  
Cyclic Citrullinated Peptide ◽  
Replacement Procedure ◽  
Antibody Titers ◽  
Age Range ◽  
Citrullinated Peptide

Background:High titers of cyclic citrullinated peptide antibodies (anti-CCP) are predictive of poor prognosis in the treatment of rheumatoid arthritis (RA). The 2010 ACR/EULAR classification criteria for early RA assign a high point value to cases having highly positive anti-CCP titers. Previous reports have claimed that osteoarthritic damage is more severe and advanced in RA patients who test positive for anti-CCP than in their negative counterparts.Objectives:To retrospectively investigate whether anti-CCP titers were associated with the extent of osteoarthritic damage in RA patients treated at our institution.Methods:Data were analyzed for 422 RA patients who received biologic agents due to resistance to methotrexate or other conventional antirheumatic drugs. Associations were explored between joint replacement history-i.e. total knee replacement (TKR), total hip replacement (THR), or lack thereof—and anti-CCP positivity rates and titers.Results:The sample consisted of 90 men and 332 women. On average, patients were put on biologics at 58.6 years of age (range: 22–85), and had a disease duration of 9.3 years. The first biologic agent chosen was infliximab (IFX) in 154 cases, etanercept (ETN) in 76, adalimumab (ADA) in 61, tocilizumab (TCZ) in 70, abatacept (ABT) in 41, golimumab (GLM) in 18, and certolizumab pegol (CZP) in 2. In total, 331/422 patients (78.4%) tested positive for anti-CCP. TKR was performed in 46 cases (M:F ratio: 7:39, mean age: 64.7 y, mean disease duration: 15.1 y), of which 46 were positive for anti-CCP (100%). THR was performed in 18 cases (M:F ratio: 2:16, mean age: 62.3 y, mean disease duration: 18.5 y), of which 17 were positive for anti-CCP (94.4%). The mean anti-CCP titer among all positive patients (n=331) was 152.9 IU/ml. This value was significantly higher in patients who underwent either joint replacement procedure than those who did not (215.4 v. 142.8 IU/ml, p<0.0005).Conclusion:With one exception, all RA patients who underwent joint replacement were positive for anti-CCP, and their titers were higher than non-surgical cases. Practitioners should be aware of this trend, and pay attention to the progression of damage in the knee and hip joints when treating RA patients with high anti-CCP titers.Disclosure of Interests:None declared

Minimally invasive redo aortic valve replacement with a sutureless valve implant

2021 ◽  
Keyword(s):  
Aortic Valve ◽  
Aortic Valve Replacement ◽  
Minimally Invasive ◽  
Valve Replacement ◽  
Valve Prosthesis ◽  
Mechanical Prosthesis ◽  
Invasive Approach ◽  
Replacement Procedure ◽  
Aortic Valve Prosthesis ◽  
Sutureless Valve

Reoperations for a dysfunctional mechanical aortic valve prosthesis are usually performed with a repeat sternotomy. Reopening the chest may be associated with a heart structure tear, bleeding, excessive transfusion, and a possible unfavorable outcome. Experience performing a redo aortic valve replacement with a minimally invasive approach and avoiding lysis of the pericardial adhesions is growing. We describe a redo aortic valve replacement procedure performed because of subvalvular pannus formation in a patient with a mechanical prosthesis. A partial J-shaped hemisternotomy at the 3rd intercostal space was performed; the ascending aorta was exposed and the valve was replaced with a sutureless bioprosthesis. The video tutorial shows the surgical approach, cardiopulmonary bypass solutions, and sutureless valve deployment.

scholarly journals Defibrillation success after subcutaneous implantable cardioverter-defibrillator generator replacement is not affected by impedance increase

EP Europace ◽  
2021 ◽  
Vol 23 (Supplement_3) ◽  
Author(s):  
W Van Der Stuijt ◽  
S Pepplinkhuizen ◽  
ABE Quast ◽  
L Smeding ◽  
LRA Olde Nordkamp ◽  
...  
Keyword(s):  
Ventricular Arrhythmia ◽  
Success Rate ◽  
Implantable Cardioverter Defibrillator ◽  
Retrospective Analysis ◽  
Analysis Data ◽  
Cardioverter Defibrillator ◽  
Replacement Procedure ◽  
Shock Impedance ◽  
Tertiary Center ◽  
Generator Replacement

Abstract Funding Acknowledgements Type of funding sources: None. Background Routine defibrillation testing during implant and replacement of the subcutaneous implantable cardioverter-defibrillator (S-ICD) is recommended per current guidelines. Recently, concerns have been raised about an increase in shock impedance and consequent shock failure during defibrillation testing in S-ICD patients undergoing a generator replacement. Purpose We aim to describe the defibrillation success rate in relation to the shock impedance in patients undergoing S-ICD generator replacement in our large tertiary center. Methods In this retrospective analysis, data from replacement procedures were collected from all patients who underwent an S-ICD generator replacement in our center from June 2014 to December 2020. Defibrillation testing was performed with at least one shock of ≤65J, and a successful shock was defined as terminating the ventricular arrhythmia within 5 seconds after the shock. Results A total of 133 patients underwent an S-ICD generator replacement, 5.8 ± 0.9 years after initial implant. Reasons for replacement were: reaching of elective replacement indicator (n = 119), early battery depletion (n = 9), complaints of generator pocket (n = 3) and device malfunction (n = 2). Defibrillation testing was performed in 111 patients (86.5%) undergoing a replacement procedure. Shock impedance data from both the implant and replacement procedure were available in 101 patients. The median shock impedance of these patients during their replacement procedure was significantly higher than during their implant, 79Ω (IQR 66-94) and 66Ω (IQR 57.5-81) respectively (Z = -5.552, p &lt; 0.001). Despite the higher shock impedance, first shock during defibrillation testing was successful in 105/111 patients (94.6%), with a success rate of 97.3% after two attempts. In the remaining three patients, the ventricular arrhythmia could only be terminated with a 80J shock. This was the case during both their initial implant and their replacement procedure. Shock impedance increase between implant and replacement was not significantly higher in patients with a successful first shock compared to patients with an unsuccessful first shock (Δ+11.1 ± 20.0Ω versus Δ+12.7 ± 27.6Ω, p = 0.86). Conclusion In this large retrospective analysis, we have shown a first shock success rate during S-ICD generator replacement of 94.6%, which is similar to the success rate of defibrillation testing after initial implant. After multiple attempts, defibrillation testing success rate was 100%. Even though the median shock impedance during replacement was significantly higher than during the initial implant, there was no difference in impedance increase in patients with a successful shock compared to patients with an unsuccessful shock. Abstract Figure. Defibrillation success

scholarly journals A 6-Month-Old Neglected Obturator Inferior Variety of Anterior Hip Dislocation in A Young Male Managed with an Intermediary Salvage Measure Without the Need for Osteotomy or Excision Arthroplasty with A Resultant Ambulatory Natural Hip – A Case Report

2021 ◽  
Vol 11 (7) ◽  
Author(s):  
Spandan R Koshire ◽  
Rajesh R Koshire ◽  
Sangam Jain
Keyword(s):  
Case Report ◽  
Open Reduction ◽  
Hip Dislocation ◽  
Young Male ◽  
Anterolateral Approach ◽  
Salvage Procedure ◽  
Replacement Procedure ◽  
Anterior Hip Dislocation ◽  
Excision Arthroplasty

Introduction: Among all the traumatic hip dislocations, anterior hip dislocation is a rarity in which the obturator inferior variety is one of the rarest to be documented [1]. Here we present to you the case of our patient, a 35-year-old male with a six month neglected obturator variety of anterior hip dislocation treated by salvage procedure of open reduction without the need for intertrochanteric osteotomy and resultant preserved natural hip for ambulation as an intermediary procedure. Case Report: Mr. SH a 35-year-old male had a fall from 15 feet in his village and was treated by a local quack, Meanwhile the patient continued to experience pain and difficulty walking and after an ordeal of nearly 6 months during the lockdown period in coronavirus disease pandemic, showed up in our emergency room and was diagnosed with an obturator type anterior hip dislocation for which we carried out open reduction aided with Murphys skid through an anterolateral approach and stabilization using two Steinman pins and further immobilization by Thomas splint for a period of 15 days, which was done after confirmation of intact head vascularity under general anesthesia after which gradual mobilization was initiated. 3 months post operative, now patient is ambulatory with stick support with no deformity, no pain and with early radiological features of avascular necrosis (AVN) for which Total Hip Replacement (THR) is planned at a later date. Conclusion: Utilisation of salvage procedures and moreover those with minimal operative complications will result in better, natural long-term intermediary measure outcome with a resultant delay in joint replacement procedure which is in the better interest of the patient. Keywords: Anterior hip dislocation, open reduction, obturator inferior type, neglected dislocation, Anterolateral approach.

scholarly journals Synthesis of new p-tert-butylcalix[4]arene-based polyammonium triazolyl amphiphiles and their binding with nucleoside phosphates

2018 ◽  
Vol 14 ◽  
pp. 1980-1993 ◽  
Author(s):  
Vladimir A Burilov ◽  
Guzaliya A Fatikhova ◽  
Mariya N Dokuchaeva ◽  
Ramil I Nugmanov ◽  
Diana A Mironova ◽  
...  
Keyword(s):  
Colorimetric Method ◽  
Cycloaddition Reaction ◽  
Water Soluble ◽  
Critical Aggregation Concentration ◽  
Eosin Y ◽  
Replacement Procedure ◽  
Upper Rim ◽  
First Time ◽  
Naked Eye Detection ◽  
Premicellar Aggregates

The synthesis of new calix[4]arenes adopting a cone stereoisomeric form bearing two or four azide fragments on the upper rim and water-soluble triazolyl amphiphilic receptors with two or four polyammonium headgroups via copper-catalyzed azide–alkyne cycloaddition reaction has been performed for the first time. It was found that the synthesized macrocycles form stable aggregates with hydrodynamic diameters between 150–200 nm and electrokinetic potentials about +40 to +60 mV in water solutions. Critical aggregation concentration (CAC) values were measured using a micelle method with pyrene and eosin Y as dye probes. The CAC values of tetraalkyl-substituted macrocycles 12a,b (5 µM for both) are significantly lower than those for dialkyl-substituted macrocycles 10a,b (790 and 160 µM, respectively). Premicellar aggregates of macrocycles 10a,b and 12a,b with the dye eosin Y were used for nucleotides sensing through a dye replacement procedure. It is unusual that disubstituted macrocycles 10a,b bind more effectively a less charged adenosine 5'-diphosphate (ADP) than adenosine 5'-triphosphate (ATP). A simple colorimetric method based on polydiacetylene vesicles decorated with 10b was elaborated for the naked-eye detection of ADP with a detection limit of 0.5 mM.

scholarly journals Analysis of the Past Lifetime in a Replacement Model through Stochastic Comparisons and Differential Entropy

Mathematics ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 1203 ◽  
Author(s):  
Antonio Di Crescenzo ◽  
Patrizia Di Gironimo ◽  
Suchandan Kayal
Keyword(s):  
Random Variable ◽  
Fixed Time ◽  
Neuronal Model ◽  
Lifetime Distribution ◽  
Differential Entropy ◽  
Firing Activity ◽  
Stochastic Comparisons ◽  
The Past ◽  
Replacement Procedure ◽  
Replacement Model

A suitable replacement model for random lifetimes is extended to the context of past lifetimes. At a fixed time u an item is planned to be replaced by another one having the same age but a different lifetime distribution. We investigate the past lifetime of this system, given that at a larger time t the system is found to be failed. Subsequently, we perform some stochastic comparisons between the random lifetimes of the single items and the doubly truncated random variable that describes the system lifetime. Moreover, we consider the relative ratio of improvement evaluated at x ∈ ( u , t ) , which is finalized to measure the goodness of the replacement procedure. The characterization and the properties of the differential entropy of the system lifetime are also discussed. Finally, an example of application to the firing activity of a stochastic neuronal model is provided.

scholarly journals Occurrence and management of postoperative pneumocephalus using the semi-sitting position in vestibular schwannoma surgery

2020 ◽  
Vol 162 (11) ◽  
pp. 2629-2636
Author(s):  
Kathrin Machetanz ◽  
Felix Leuze ◽  
Kristin Mounts ◽  
Leonidas Trakolis ◽  
Isabel Gugel ◽  
...  
Keyword(s):  
Posterior Fossa ◽  
Supine Position ◽  
Tumor Size ◽  
Clinical Symptoms ◽  
Neurosurgical Procedures ◽  
Posterior Fossa Surgery ◽  
Sitting Position ◽  
Tension Pneumocephalus ◽  
Replacement Procedure ◽  
Duration Of Surgery

Abstract Background The semi-sitting position in neurosurgical procedures is still under debate due to possible complications such as venous air embolism (VAE) or postoperative pneumocephalus (PP). Studies reporting a high frequency of the latter raise the question about the clinical relevance (i.e., the incidence of tension pneumocephalus) and the efficacy of a treatment by an air replacement procedure. Methods This retrospective study enrolled 540 patients harboring vestibular schwannomas who underwent posterior fossa surgery in a supine (n = 111) or semi-sitting (n = 429) position. The extent of the PP was evaluated by voxel-based volumetry (VBV) and related to clinical predictive factors (i.e., age, gender, position, duration of surgery, and tumor size). Results PP with a mean volume of 32 ± 33 ml (range: 0–179.1 ml) was detected in 517/540 (96%) patients. The semi-sitting position was associated with a significantly higher PP volume than the supine position (40.3 ± 33.0 ml [0–179.1] and 0.8 ± 1.4 [0–10.2], p < 0.001). Tension pneumocephalus was observed in only 14/429 (3.3%) of the semi-sitting cases, while no tension pneumocephalus occurred in the supine position. Positive predictors for PP were higher age, male gender, and longer surgery duration, while large (T4) tumor size was established as a negative predictor. Air exchange via a twist-drill was only necessary in 14 cases with an intracranial air volume > 60 ml. Air replacement procedures did not add any complications or prolong the ICU stay. Conclusion Although pneumocephalus is frequently observed following posterior fossa surgery in semi-sitting position, relevant clinical symptoms (i.e., a tension pneumocephalus) occur in only very few cases. These cases are well-treated by an air evacuation procedure. This study indicates that the risk of postoperative pneumocephalus is not a contraindication for semi-sitting positioning.

A “Replacement” Procedure for Reducing the Bias of Nonresponse

2004 ◽  
Vol 58 (4) ◽  
pp. 295-297 ◽  
Author(s):  
Leslie Kish ◽  
Irene Hess
Keyword(s):  
Replacement Procedure
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