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https://www.readbyqxmd.com/read/29326832/at-the-atrioventricular-crossroads-dual-pathway-electrophysiology-in-the-atrioventricular-node-and-its-underlying-heterogeneities
#1
Sharon A George, N Rokhaya Faye, Alejandro Murillo-Berlioz, K Benjamin Lee, Gregory D Trachiotis, Igor R Efimov
The atrioventricular node (AVN) is a complex structure that performs a variety of functions in the heart. The AVN is primarily an electrical gatekeeper between the atria and ventricles and introduces a delay between atrial and ventricular excitation, allowing for efficient ventricular filling. The AVN is composed of several compartments that safely transmit electrical excitation from the atria to the ventricles via the fast or slow pathways. There are many electrophysiological differences between these pathways, including conduction time and electrical refractoriness, that increase the predisposition of the atrioventricular junction to arrhythmias such as atrioventricular nodal re-entrant tachycardia...
December 2017: Arrhythmia & Electrophysiology Review
https://www.readbyqxmd.com/read/29298067/high-levels-of-avenanthramides-in-oat-based-diet-further-suppress-high-fat-diet-induced-atherosclerosis-in-ldlr-mice
#2
Michael Thomas, Sharon Kim, Weimin Guo, William F Collins, Mitchell L Wise, Mohsen Meydani
Oats, in addition to cholesterol-lowering properties, contain unique antioxidants called avenanthramides (Avns), which inhibit both inflammatory cytokines and adhesion molecules in endothelial cells in culture. This study evaluated the effects of Avns of oats on atherosclerosis in Ldlr-/- mice, one of the most commonly used atherosclerosis mouse models with their similar cholesterol distributions to humans. The Ldlr-/- mice were fed a low fat, high fat, high fat containing regular oat brans with low levels of Avns (HFLA), or high fat containing regular oat brans with high levels of Avns (HFHA) diet...
January 3, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29288034/structural-and-functional-remodelling-of-the-atrioventricular-node-with-ageing-in-rats-the-role-of-hyperpolarization-activated-cyclic-nucleotide-gated-and-ryanodine-2-channels
#3
Yawer Saeed, Ian Temple, Zoltan Borbas, Andrew Atkinson, Joseph Yanni, Michal Maczewski, Urszula Mackiewicz, Mariam Aly, Sunil J R J Logantha, Clifford Garratt, Halina Dobrzynski
BACKGROUND: Ageing is associated with an increased incidence of atrioventricular nodal (AVN) dysfunction. OBJECTIVES: The aim of the study is to identify the structural and functional remodelling in the atrioventricular junction (AVJ) with ageing. METHODS: Electrophysiological, histology and immunohistochemistry experiments on male Wistar-Hanover rats aged 3months (n=24) and 2years (n=15) were performed. AH interval, Wenkebach cycle length (WBCL) and AVN effective refractory period (AVNERP) were measured...
December 26, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/29274077/increasing-t-type-calcium-channel-activity-by-%C3%AE-adrenergic-stimulation-contributes-to-%C3%AE-adrenergic-regulation-of-heart-rates
#4
Yingxin Li, Xiaoxiao Zhang, Chen Zhang, Xiaoying Zhang, Ying Li, Zhao Qi, Christopher Szeto, Mingxin Tang, Yizhi Peng, Jeffery D Molkentin, Steven R Houser, Mingxing Xie, Xiongwen Chen
OBJECTIVE: Cav3.1 (α1G ) T-type Ca2+ channel (TTCC) is expressed in mouse sinoatrial node cells (SANCs) and atrioventricular nodal (AVN) cells and contributes to heart rate genesis and AV conduction. However, its role in heart rate (HR) regulation and AV conduction acceleration by the β-adrenergic system (SAS) is unclear, which is the topic of this study. METHODS AND RESULTS: L- (ICa-L ) and T-type (ICa-T ) Ca2+ currents were recorded in SANCs from Cav3.1 transgenic (TG) and knockout (KO), and control mice...
December 23, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/29210310/outcome-of-pinning-in-patients-with-slipped-capital-femoral-epiphysis-risk-factors-associated-with-avascular-necrosis-chondrolysis-and-femoral-impingement
#5
Alexandru Ulici, Madalina Carp, Iulia Tevanov, Catalin Alexandru Nahoi, Alin Gabriel Sterian, Dan Cosma
Objective This study aimed to assess the principal risk factors that could lead to the most common long-term complications of slipped capital femoral epiphysis, such as avascular necrosis, chondrolysis, and hip impingement. Methods We conducted a single-centre, retrospective study and evaluated patients (70 patients, 81 hips) who were treated for slipped capital femoral epiphysis from 2010 to 2015 and who underwent pinning. We measured the severity of displacement radiologically using the Southwick angle. Postoperative radiographs were evaluated for the most frequent long-term complications of avascular necrosis (AVN), chondrolysis, and femoral acetabular impingement (FAI)...
January 1, 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/29182116/surgical-treatment-for-developmental-dysplasia-of-the-hip-a-single-surgeon-series-of-47-hips-with-a-7-year-mean-follow-up
#6
J Mcfarlane, J H Kuiper, N Kiely
The treatment of developmental dysplasia of the hip (DDH) in children remains controversial. We describe the clinical and radiological outcomes of  47 hips in 43 children treated with open surgery by one surgeon between 2004 and 2008 for DDH. The mean age at operation was 25 months (5 to 113) with a mean follow up of  89 months  (22 to 169). At the latest follow up 40 of the 45 hips where Severin grades were recordable (89%) were graded as excellent or good, Severin class I or II. Clinically significant AVN (grade II to III  according to the Kalamchi and MacEwen classification) was seen in 6  (13%) of the hips...
December 2016: Acta Orthopaedica Belgica
https://www.readbyqxmd.com/read/29181188/intra-articular-osteochondroma-of-the-posteroinferior-femoral-neck-associated-with-hip-joint-osteochondromatosis-a-case-report
#7
Sung Il Wang, Eun Hae Park, Sun Jung Yoon, Jung Ryul Kim
Osteochondromas are usually extra-articular lesions originating from the metaphysis of long bones. Intra-articular osteochondromas may also occur, causing pain and discomfort and restricting the range of motion. Osteochondromas of the femoral neck are intra-articular lesions that are difficult to access for surgical resection, particularly when located posteriorly. We herein present a rare case of an intra-articular osteochondroma involving the posteroinferior aspect of the femoral neck associated with secondary synovial osteochondromatosis (SOC) of the hip joint in a 25-year-old woman...
November 2017: Molecular and Clinical Oncology
https://www.readbyqxmd.com/read/29174341/feasibility-accuracy-and-reproducibility-of-aortic-annular-and-root-sizing-for-transcatheter-aortic-valve-replacement-using-novel-automated-three-dimensional-echocardiographic-software-comparison-with-multi-detector-row-computed-tomography
#8
Edgard A Prihadi, Philippe J van Rosendael, E Mara Vollema, Jeroen J Bax, Victoria Delgado, Nina Ajmone Marsan
BACKGROUND: In transcatheter aortic valve replacement (TAVR), multi-detector row computed tomography (MDCT) is currently the standard imaging modality for correct prosthesis sizing, despite risks of radiation and contrast-induced renal injury. Three-dimensional (3D) transesophageal echocardiography (TEE) has been proposed as a potential alternative imaging technique, and recently, automated 3D transesophageal echocardiographic software (Aortic Valve Navigator [AVN], an unreleased prototype from Philips) has been developed for assessment of the aortic annulus and root...
November 23, 2017: Journal of the American Society of Echocardiography
https://www.readbyqxmd.com/read/29166545/occurrence-of-primarily-noninducible-atrioventricular-nodal-reentry-tachycardia-after-radiofrequency-delivery-in-the-slow-pathway-region-during-empirical-slow-pathway-modulation
#9
Felix Konrad Wegner, Nils Bögeholz, Patrick Leitz, Gerrit Frommeyer, Dirk Georg Dechering, Simon Kochhäuser, Philipp Sebastian Lange, Julia Köbe, Kristina Wasmer, Gerold Mönnig, Lars Eckardt, Christian Pott
BACKGROUND: The first-line therapy for atrioventricular nodal reentry tachycardia (AVNRT) is catheter-based slow pathway modulation. If AVNRT is not inducible during an electrophysiological study, an empirical slow pathway modulation (ESPM) may be considered in patients with dual atrioventricular nodal physiology and/or a typical electrocardiogram (ECG). METHODS: We screened 149 symptomatic patients who underwent ESPM in our department between 1993 and 2013. All patients fulfilled the following criteria: (1) either dual atrioventricular nodal (AVN) physiology with up to 2 AVN echo beats or characteristic ECG documentation or both, (2) noninducibility of AVNRT by programmed stimulation, and (3) completion of a telephone questionnaire for long-term follow-up...
November 22, 2017: Clinical Cardiology
https://www.readbyqxmd.com/read/29130113/long-term-results-of-closed-reduction-for-developmental-dislocation-of-the-hip-in-children-of-walking-age-under-eighteen-months-old
#10
Soo Min Cha, Hyun Dae Shin, Byung Kon Shin
BACKGROUND: Developmental dysplasia of the hip (DDH) diagnosed in older postnatal children can be effectively treated by closed reduction (CR) alone. However, no prospective or comparative trial to explore the differential effectiveness of CR between non-walking and walking postnatal children has yet been reported. This study investigated the clinical and radiologic outcomes of CR in the age range of interest (12-18 months old) via a prospective trial and compared these results with those of a younger age group who also underwent CR...
November 13, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/29125919/autologous-chondrocyte-implantation-sandwich-technique-compared-with-autologous-bone-grafting-for-deep-osteochondral-lesions-in-the-knee
#11
Tom Minas, Takahiro Ogura, Jeff Headrick, Tim Bryant
BACKGROUND: Treating symptomatic osteochondral defects is challenging, especially in young adults with deep (>8-10 mm) empty defects after osteochondritis dissecans (OCD) or collapsed condyles secondary to avascular necrosis (AVN). For this population, osteoarthritis (OA) is inevitable if articular congruence is not restored. PURPOSE: To describe the autologous chondrocyte implantation (ACI) "sandwich" technique with autologous bone grafting (ABG) and compare it with ABG alone for restoration of the osteochondral unit...
November 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/29114187/use-of-fibular-bone-graft-and-cancellous-screw-fixation-in-the-management-of-neglected-femur-neck-fractures-in-young-patients
#12
Ghulam Mustafa Kaim Khani, Kamran Hafeez, Muhammad Bux, Nusrat Rasheed, Naveed Ahmed, M Perwez Anjum
Objective: To present the clinical outcome of patients with neglected femur neck fracture treated with fibular bone graft. Methods: During May 2010-February 2013, 15 patients younger than 35 years of age with neglected fracture neck of femur were managed with non-vascularized fibular graft and cannulated screws. Fractures were classified according to Sandhu Classification. Hip function was assessed using Harris hip score. Results: Fifteen patients with mean age of 28...
November 2017: International Journal of Health Sciences
https://www.readbyqxmd.com/read/29106948/good-functional-outcome-but-not-regained-health-related-quality-of-life-in-the-majority-of-20-69-years-old-patients-with-femoral-neck-fracture-treated-with-internal-fixation-a-prospective-2-year-follow-up-study-of-182-patients
#13
Pierre Campenfeldt, Margareta Hedström, Wilhelmina Ekström, Amer N Al-Ani
BACKGROUND AND PURPOSE: Prospective studies on patient related outcome in patients <70years with a femoral neck fracture (FNF) are few. We aimed to investigate functional outcome and health-related quality of life (HRQoL) in 20-69years old patients with a FNF treated with internal fixation. PATIENTS AND METHODS: 182 patients, 20-69years with a FNF treated with internal fixation were prospectively included in a multicenter study. Follow up included radiographic and clinical examination at 4, 12 and 24 months...
December 2017: Injury
https://www.readbyqxmd.com/read/29081846/avascular-necrosis-in-children-with-cerebral-palsy-after-reconstructive-hip-surgery
#14
L Phillips, K Hesketh, E K Schaeffer, J Andrade, J Farr, K Mulpuri
PURPOSE: Progressive hip displacement is one of the most common orthopaedic pathologies in children with cerebral palsy (CP). Reconstructive hip surgery has become the standard treatment of care. Reported avascular necrosis (AVN) rates for hip reconstructive surgery in these patients vary widely in the literature. The purpose of this study is to identify the frequency and associated risk factors of AVN for reconstructive hip procedures. METHODS: A retrospective analysis was performed of 70 cases of reconstructive hip surgery in 47 children with CP, between 2009 and 2013...
October 1, 2017: Journal of Children's Orthopaedics
https://www.readbyqxmd.com/read/29075150/avenanthramide-c-reduces-the-viability-of-mda-mb-231-breast-cancer-cells-through-an-apoptotic-mechanism
#15
Jordan Hastings, Jason Kenealey
BACKGROUND: Avenanthramides (AVN) are a relatively unstudied family of phytochemicals that could be novel chemotherapeutics. These compounds, found in oats, are non-toxic to healthy cells and have been shown to reduce viability of human colon and liver cancers in vitro. However, these studies do not elucidate a molecular mechanism for individual AVN. In this study we aim to see the effects of AVN on MDA-MB-231 breast cancer cells. METHODS: An MTT assay was used to determine cell viability...
2017: Cancer Cell International
https://www.readbyqxmd.com/read/29068514/high-incidence-of-aseptic-hip-necrosis-in-hodgkin-lymphoma-patients-treated-with-escalated-beacopp-receiving-methylprednisolone
#16
Sandra Basic-Kinda, Ivan Karlak, Nadira Durakovic, Zvonimir Ivan Lubina, Ivo Radman, Snježana Dotlic, Zinaida Peric, Ida Hude, Igor Aurer
BACKGROUND: Escalated BEACOPP (eBEACOPP) is an effective but fairly toxic regimen for treatment of Hodgkin lymphoma (HL). Avascular necrosis of femoral head (AVN) was previously reported to be increased in patients treated with eBEACOPP, but so far no systematic analysis of its frequency has been published. AIMS: We aimed to analyze frequency and identify possible risk factors for AVN development in patients treated with eBEACOPP. METHODS: We identified 26 patients treated with eBEACOPP for newly diagnosed high-risk advanced stage HL, 25 patients alive at the time of study...
October 25, 2017: Internal Medicine Journal
https://www.readbyqxmd.com/read/29068288/timing-of-surgical-intervention-for-developmental-dysplasia-of-the-hip-a-randomised-controlled-trial-hip-op
#17
Charlotte L Williams, Susie Weller, Lisa Roberts, Isabel Reading, Andrew Cook, Louisa Little, Wendy Wood, Louise Stanton, Andreas Roposch, Nicholas Mp Clarke
BACKGROUND: Developmental dysplasia of the hip (DDH) is a very common congenital disorder, and late-presenting cases often require surgical treatment. Surgical reduction of the hip may be complicated by avascular necrosis (AVN), which occurs as a result of interruption to the femoral head blood supply during treatment and can result in long-term problems. Some surgeons delay surgical treatment until the ossific nucleus (ON) has developed, whereas others believe that the earlier the reduction is performed, the better the result...
October 2017: Health Technology Assessment: HTA
https://www.readbyqxmd.com/read/29061495/femoral-osteochondroplasty-can-be-performed-effectively-without-the-risk-of-avascular-necrosis-or-femoral-neck-fractures-in-an-experimental-ovine-fai-model
#18
F Schmaranzer, L Arendt, T D Lerch, S D Steppacher, K Nuss, N Wolfer, H E Dawson, B von Rechenberg, P R Kircher, M Tannast
OBJECTIVE: The experimental induction of cam-type femoroacetabular impingement (FAI) in sheep is established. To tap the full potential of this ovine model, one should be able to perform a femoral osteochondroplasty safely. This study was based on previous cadaver experiments on the blood supply to the ovine femoral head and on the biomechanical strength of the proximal femur following offset creation. We hypothesized that offset creation in this ovine FAI model does not lead to (1) avascular necrosis (AVN) of the ovine femoral head or (2) iatrogenic femoral neck fractures and (3) can be performed effectively...
October 20, 2017: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/29027184/low-rate-of-clinically-important-avascular-necrosis-of-the-femoral-head-after-ludloff-s-procedure
#19
Jesper Holbeck-Brendel, Bjarne Møller-Madsen, Ivan Hvid, Michel B Hellfritzsch, Line K Pedersen, Peter Dalsgaard, Ole Rahbek
INTRODUCTION: Ludloff's procedure for open reduction of congenital dislocation of the hip (CDH) is recommended for its minimal tissue damage, but is criticised for the risk of late avascular necrosis (AVN) of the femoral head. The aim of present study was primarily to assess the risk of late AVN of the femoral head and secondly the range of motion (ROM) of the hip and the quality of life in children following Ludloff's procedure. METHODS AND MATERIALS: 13 hips in 11 children after Ludloff's procedure due to CDH were included retrospectively from 1997 to 2005 at Aarhus University Hospital...
October 12, 2017: Hip International: the Journal of Clinical and Experimental Research on Hip Pathology and Therapy
https://www.readbyqxmd.com/read/29026869/associations-between-antiretroviral-treatment-and-avascular-bone-necrosis-the-swiss-hiv-cohort-study
#20
Cornelia Bayard, Bruno Ledergerber, Markus Flepp, Thanh Lecompte, Estelle Moulin, Matthias Hoffmann, Rainer Weber, Cornelia Staehelin, Caroline Di Benedetto, Christoph A Fux, Philip E Tarr, Barbara Hasse
BACKGROUND: HIV-infected individuals have an increased risk of avascular bone necrosis (AVN). Antiretroviral therapy (ART) and particularly protease inhibitors (PI) have been implicated as a risk factor. We aimed to study the associations of ART with the occurrence of AVN among Swiss HIV Cohort Study participants (SHCS). METHODS: We used incidence density sampling to perform a case control study within the Swiss HIV Cohort Study (SHCS) comparing prospectively collected AVN cases and controls by conditional logistic regression analysis...
2017: Open Forum Infectious Diseases
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