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https://www.readbyqxmd.com/read/28444887/morphological-study-of-the-atrioventricular-conduction-system-and-purkinje-fibers-in-yak
#1
Deyong Duan, Sijiu Yu, Yan Cui, Chaoxu Li
We studied the morphology of the atrioventricular conduction system (AVCS) and Purkinje fibers of the yak. Light and transmission electron microscopy were used to study the histological features of AVCS. The distributional characteristics of the His-bundle, the left bundle branch (LBB), right bundle branch (RBB), and Purkinje fiber network of yak hearts were examined using gross dissection, ink injection, and ABS casting. The results showed that the atrioventricular node (AVN) of yak located in the right side of interatrial septum and had a flattened ovoid shape...
April 26, 2017: Journal of Morphology
https://www.readbyqxmd.com/read/28436840/a-parametric-computational-model-of-the-action-potential-of-pacemaker-cells
#2
Weiwei Ai, Nitish Patel, Partha Roop, Avinash Malik, Sidharta Andalam, Eugene Yip, Nathan Allen, Mark Trew
OBJECTIVE: A flexible, efficient and verifiable pacemaker cell model is essential to the design of real-time virtual hearts that can be used for closed-loop validation of cardiac devices. A new parametric model of pacemaker action potential is developed to address this need. METHODS: The action potential phases are modeled using hybrid automaton (HA) with one piecewise-linear continuous variable. The model can capture ratedependent dynamics, such as action potential duration (APD) restitution, conduction velocity (CV) restitution, and overdrive suppression by incorporating non-linear update functions...
April 24, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28430719/intertrochanteric-osteotomy-for-femoral-neck-non-union-does-undercorrection-result-in-an-acceptable-rate-of-femoral-neck-union
#3
Brandon J Yuan, David W Shearer, David P Barei, Sean E Nork
OBJECTIVES: To analyze the radiographic outcomes of intertrochanteric osteotomy for the treatment of femoral neck non-union with "undercorrection" of the Pauwels' angle and relative preservation of the proximal femoral anatomy. DESIGN: Retrospective cohort study SETTING:: Level-1 trauma center PATIENTS:: Thirty-two patients with established femoral neck non-unions that had been treated with intertrochanteric osteotomy were retrospectively identified through Current Procedural Terminology (CPT) codes...
April 18, 2017: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/28416828/-application-of-bilateral-direct-anterior-approach-total-hip-arthroplasty-a-report-of-22-cases
#4
J Tang, M Lv, Y X Zhou, J Zhang
OBJECTIVE: To analyze the operation technique and the methods to avoid early complications on the learning curve for bilateral direct anterior approach (DAA) total hip arthroplasty (THA). METHODS: We retrospectively studied a series of continued cases with bilateral avascular necrosis of the femoral head (AVN) or degenerative dysplastic hip and rheumatoid arthritis that were treated by DAA THA in Beijing Jishuitan Hospital. A total of 22 patients with 44 hips were analyzed from June 2014 to August 2016 in this study...
April 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28391429/femoral-neck-fracture-osteosynthesis-by-the-biplane-double-supported-screw-fixation-method-bdsf-reduces-the-risk-of-fixation-failure-clinical-outcomes-in-207-patients
#5
Orlin Filipov, Karl Stoffel, Boyko Gueorguiev, Christoph Sommer
INTRODUCTION: Osteosynthesis of femoral neck fractures is related up to 46% rate of complications. The novel method of biplane double-supported screw fixation (BDSF; Filipov's method) offers better stability using three medially diverging cannulated screws with two of them buttressed on the calcar. Biomechanically, the most effective component is the distal screw placed at steeper angle and supported on a large area along the distal and posterior cortex of the femoral neck following its spiral anterior curve...
April 8, 2017: Archives of Orthopaedic and Trauma Surgery
https://www.readbyqxmd.com/read/28371500/joint-preserving-surgery-for-talar-malunions-or-nonuions
#6
Gang Chen, Mu Hu, Yang Xu, Yue-Huan Zhen, Yuan Hong, Xiang-Yang Xu
OBJECTIVE: To describe the technique and analyze the outcomes of joint-preserving surgical treatments which included anatomical reconstruction or alignment correction for talar malunions or nonunions, and avoid development of degenerative changes in the adjacent joints. METHODS: Eight patients who had painful talar malunions or nonunions treated between 2009 and 2015 were included in this retrospective study. The mean age of the patients was 35.6 years, with patients aged from 18 to 58 years...
February 2017: Orthopaedic Surgery
https://www.readbyqxmd.com/read/28370770/expression-of-kit-ligand-and-insulin-like-growth-factor-binding-protein-3-during-in-vivo-or-in-vitro-development-of-ovarian-follicles-in-sheep
#7
D Srividya, V Praveen Chakravarthi, Ssr Kona, Avn Siva Kumar, K V Brahmaiah, V H Rao
Expression of Kit ligand (KL) and insulin-like growth factor binding protein (IGFBP3) genes was studied at different in vivo and corresponding in vitro stages of development of the ovarian follicles in sheep. The expression of both KL and IGFBP3 was significantly higher in the primordial follicles relative to any other stage of development. Compared to the other stages, the KL expression in the cumulus cells from in vivo grown large antral follicles and that of IGFBP3 in COCs' isolated from large antral follicles matured in vitro for 24 hr were significantly higher...
March 31, 2017: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/28368928/bilateral-avascular-necrosis-of-the-femoral-head-following-asynchronous-postictal-femoral-neck-fractures-a-case-report-and-review-of-the-literature
#8
K Venkatadass, M Avinash, S Rajasekaran
Bilateral avascular necrosis (AVN) following postictal bilateral fracture neck of the femur is a rare occurrence. Here, we report a case of bilateral AVN of the femoral head following an asynchronous bilateral postictal fracture neck of the femur. A 16-year-old autistic boy presented with left hip pain following an episode of seizures and radiographs showed Delbet type II fracture neck of the left femur. This was treated by closed reduction and cancellous screw fixation and skeletal traction for 6 weeks. At 3 months, follow-up radiograph showed union of the fracture, but he had developed segmental AVN with collapse of the head...
March 31, 2017: Journal of Pediatric Orthopedics. Part B
https://www.readbyqxmd.com/read/28344523/scaphoid-nonunion-with-poor-prognostic-factors-the-role-of-the-free-medial-femoral-condyle-vascularized-bone-graft
#9
Tahseen Chaudhry, Lauren Uppal, Dominic Power, Michael Craigen, Simon Tan
Background: To report on the results of free medial femoral condyle (MFC) vascularized bone graft for scaphoid nonunions with 1 or more poor prognostic factors. Methods: We have used the free MFC vascularized bone graft for scaphoid nonunions that have 1 or more factors associated with a poor prognosis. These were, a delay in presentation of over 5 years, a proximal pole nonunion, the presence of avascular necrosis (AVN), or previous nonunion surgery. We used this technique on 20 patients over a 4.5-year period...
March 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28341264/total-hip-arthroplasty-survival-in-femoral-head-avascular-necrosis-versus-primary-hip-osteoarthritis-case-control-study-with-a-mean-10-year-follow-up-after-anatomical-cementless-metal-on-metal-28-mm-replacement
#10
D Ancelin, N Reina, E Cavaignac, S Delclaux, P Chiron
BACKGROUND: Total hip arthroplasty is the most widely used procedure to treat avascular necrosis (AVN) of the femoral head. Few studies have compared the outcomes of THA in femoral head AVN and primary hip osteoarthritis. Therefore we performed a case-control study to compare THA for femoral head AVN vs. primary hip osteoarthritis in terms of: (1) prosthesis survival, (2) complication rates, (3) functional outcomes and radiographic outcomes, (4) and to determine whether specific risk factors for THA failure exist in femoral head AVN...
December 2016: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28340121/atrioventricular-nodal-echoes-over-a-wide-echo-window-as-a-therapeutic-end-point-for-the-catheter-guided-radiofrequency-ablation-of-atrioventricular-nodal-reentrant-tachycardia-a-prospective-study
#11
Mohammad Hossein Nikoo, Armin Attar, Mohammad Pourmontaseri, Mohammad Vahid Jorat, Mohammad Kafi
Aims: In previous retrospective studies, it was shown that the presence of residual single atrioventricular node (AVN) echoes with an echo zone longer than 30 ms may increase the rate of recurrence after radiofrequency ablation (RFA) of slow pathway in patients with AVN reentrant tachycardia (AVNRT). Based on that, some centres perform additional RFA in these patients. However, this opinion has never been tested prospectively and many centres do not perform re-ablation in these patients...
March 15, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
https://www.readbyqxmd.com/read/28328562/treatment-of-unstable-versus-stable-slipped-capital-femoral-epiphysis-using-the-modified-dunn-procedure
#12
Richard L Davis, Walter P Samora, Freddie Persinger, Kevin E Klingele
BACKGROUND: The modified Dunn procedure (open subcapital realignment via a surgical dislocation approach) has been shown to be a safe and effective way of treating acute, unstable slipped capital femoral epiphysis (SCFE). There is a paucity of literature comparing the modified Dunn procedure in stable SCFE. The purpose of this study was to compare acute, unstable versus chronic, stable SCFE managed with the modified Dunn procedure. METHODS: A retrospective chart review was performed on 44 skeletally immature patients who underwent the modified Dunn procedure for SCFE...
March 21, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28314897/transient-osteoporosis-of-the-hip-review-of-the-literature
#13
REVIEW
K Asadipooya, L Graves, L W Greene
Transient osteoporosis of the hip (TOH) is a temporary clinical condition of unknown etiology which usually resolves with conservative therapy though may be complicated by fracture or progression to avascular necrosis (AVN). TOH may be slightly more prevalent in men but when it occurs in women, it is most often seen in the latter part of pregnancy. Though fracture is a rare complication of TOH when it occurs, it is most often associated with TOH occurring in pregnancy. Magnetic resonance imaging (MRI) is the best method to diagnosis TOH...
March 17, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28288077/comparison-of-surgical-outcomes-between-a-triplane-proximal-femoral-osteotomy-and-the-modified-dunn-procedure-for-stable-moderate-to-severe-slipped-capital-femoral-epiphysis
#14
Jakub Sikora-Klak, James D Bomar, Christina N Paik, Dennis R Wenger, Vidyadhar Upasani
BACKGROUND: Recent studies have demonstrated the intra-articular cartilage and labral damage that can occur from the proximal femoral cam-like deformity of a moderate to severe slipped capital femoral epiphysis (SCFE). The approach to treating this deformity in a symptomatic Loder stable hip is controversial. The purpose of this study was to compare radiographic outcomes, complication rates, and revision rates between Imhauser type triplane proximal femoral osteotomy (TPFO) and the modified Dunn procedure (MDP)...
March 10, 2017: Journal of Pediatric Orthopedics
https://www.readbyqxmd.com/read/28283822/antiproliferative-activity-of-vitexin-2-o-xyloside-and-avenanthramides-on-caco-2-and-hepg2-cancer-cells-occurs-through-apoptosis-induction-and-reduction-of-pro-survival-mechanisms
#15
Emanuele Salvatore Scarpa, Elena Antonini, Francesco Palma, Michele Mari, Paolino Ninfali
PURPOSE: CaCo-2 colon cancer cells and HepG2 liver cancer cells represent two malignant cell lines, which show a high resistance to apoptosis induced by the conventional anticancer drugs. Vitexin-2-O-xyloside (XVX) and avenanthramides (AVNs) are naturally occurring dietary agents from Beta vulgaris var. cicla L. and Avena sativa L., respectively. The aim of this work was to evaluate the antiproliferative effects and the reduction of the pro-survival mechanisms exerted by XVX and AVNs, used individually and in combination, in CaCo-2 and HepG2 cancer cells...
March 10, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28250858/risk-stratification-for-avascular-necrosis-of-the-femoral-head-after-internal-fixation-of-femoral-neck-fractures-by-post-operative-bone-spect-ct
#16
Sangwon Han, Minyoung Oh, Seokho Yoon, Jinsoo Kim, Ji-Wan Kim, Jae-Suk Chang, Jin-Sook Ryu
PURPOSE: Avascular necrosis (AVN) of the femoral head is a major complication after internal fixation of a femoral neck fracture and determines the functional prognosis. We investigated postoperative bone single-photon emission computed tomography/computed tomography (SPECT/CT) for assessing the risk of femoral head AVN. METHODS: We retrospectively reviewed 53 consecutive patients who underwent bone SPECT/CT within 2 weeks of internal fixation of a femoral neck fracture and follow-up serial hip radiographs over at least 12 months...
March 2017: Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/28247610/-operative-versus-non-operative-treatment-for-three-or-four-part-proximal-humeral-fractures-in-elderly-patients-a-meta-analysis-of-randomized-controlled-trials
#17
Wenbo Li, Gaoheng Ding, Jun Liu, Jie Shi, Chao Zhang, Qiuming Gao
Objective: To evaluate the efficacy of operative and non-operative treatment for three- or four-part proximal humeral fractures in elderly patients by meta-analysis. Methods: The literature search was performed in Cochrance Library, Medline, Embase, SinoMed, CNKI, Wanfang data and CQVIP databases for operative and non-operative treatment of three- or four-part proximal humeral fractures in elderly patients, and searches of conference proceedings were also conducted. The data were extracted and a meta-analysis was performed using RevMan 5...
May 25, 2016: Zhejiang da Xue Xue Bao. Yi Xue Ban, Journal of Zhejiang University. Medical Sciences
https://www.readbyqxmd.com/read/28244282/descriptive-epidemiology-of-patients-undergoing-total-hip-arthroplasty-in-korea-with-focus-on-incidence-of-femoroacetabular-impingement-single-center-study
#18
Woo Yong Lee, Deuk Soo Hwang, Chang Kyun Noh
We analyzed the causes leading to total hip arthroplasty (THA), aimed to clarify the incidence of femoroacetabular impingement (FAI) among the causes, and compared the incidence in Korea with those in other countries. From January 2000 to December 2014, 1,206 hips of 818 patients who underwent primary THA at our institute were reviewed retrospectively in terms of radiographs and electronic charts. The radiographs and radiographic parameters were reviewed and measured by 2 of the authors, who are orthopedic surgeons...
April 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28241727/-analysis-of-outcomes-of-one-stage-operation-for-treatment-of-late-diagnosed-developmental-dysplasia-of-hip
#19
Y Liu, J Sun
Objective: To evaluate and identify the middle-term results of one-stage open reduction of patients in late-diagnosed developmental dysplasia of the hip, and to explore the best age group for treatment. Methods: A total number of 311 patients (390 hips) with LDDH in Department of Pediatric Orthopaedic of Anhui Provincial Children's Hospital from June 2006 to December 2010 were retrospectively reviewed. The patients were divided into 3 groups according to age at the start of surgical treatment: 1.5-2.5 years, 2...
March 1, 2017: Zhonghua Wai Ke za Zhi [Chinese Journal of Surgery]
https://www.readbyqxmd.com/read/28240590/a-meta-analysis-of-avascular-necrosis-in-systemic-lupus-erythematosus-prevalence-and-risk-factors
#20
Tatiana Nevskaya, Maeve P Gamble, Janet E Pope
OBJECTIVES: To determine the prevalence of and risk factors for avascular necrosis (AVN) in systemic lupus erythematosus (SLE). METHODS: MEDLINE, CINAHL, Web of Science, EMBASE and Cochrane Library were searched from inception to July, 2015 and a random effects model was used to combine frequencies; study quality was assessed using STROBE. RESULTS: 2,041 citations identified 62 articles. Many results had high heterogeneity. The prevalence of symptomatic AVN was 9% (range 0...
February 24, 2017: Clinical and Experimental Rheumatology
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