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Repetitive implantation failure

J Voirin, I Darie, D Fischer, A Simon, I Rohmer-Heitz, F Proust
INTRODUCTION: Motor cortex stimulation is a well-known treatment modality for refractory neuropathic pain. Nevertheless, some cases of therapeutic failure have been described but alternative therapies for these cases are rarely reported. CASE REPORT: The patient presented with neuropathic pain in his right arm due to a cervical syrinx which was surgically treated by a shunt in 2003 with no clinical improvement. As alternative therapy, after an evaluation by repetitive magnetic transcranial stimulation with significant benefit, motor cortex stimulation was successfully implanted in 2004...
October 19, 2016: Neuro-Chirurgie
Solène Le Pennec-Prigent, Erwan Flecher, Vincent Auffret, Guillaume Leurent, Jean-Claude Daubert, Christophe Leclercq, Philippe Mabo, Jean-Philippe Verhoye, Raphael P Martins
OBJECTIVES: Extracorporeal life support is used for patients with severe heart failure as a bridge to heart transplantation or recovery. We aimed at analyzing the efficacy and safety of extracorporeal life support to treat refractory arrhythmic storm responsible for cardiogenic shock in patients resistant to antiarrhythmic drugs. DESIGN: Retrospective study. SETTING: University Hospital of Rennes, France. PATIENTS: Patients with refractory arrhythmic storm admitted between January 2005 and March 2015...
October 14, 2016: Critical Care Medicine
E B Deerenberg, J Verhelst, S E R Hovius, J F Lange
BACKGROUND: Recurrence is the most important complication of abdominal wall reconstruction. It is possible the repair itself is intact, but bulging or expansion of mesh causes recurrent swelling's of the abdominal wall. CASE SUMMARY: In this report, we present bulging of a polyester mesh due to central pore expansion. DISCUSSION: Repetitive stress and variations in intra-abdominal pressure can change tensile strength and stretches mesh materials...
September 30, 2016: International Journal of Surgery Case Reports
Fei Dong, Qian Li, JianJun Wu, MinMing Zhang, GuangQiang Zhang, Bin Li, Kai Jin, Jie Min, WeiRen Liang, Ming Chao
INTRODUCTION: Carotid blowout syndrome (CBS) secondary to radiation therapy is life-threatening and requires emergency treatment. More recently, endovascular treatment has provided an effective way to control CBS-related bleeding. CASE DESCRIPTION: We present a case of CBS with a rupture of the internal carotid artery (ICA) pseudo-aneurysm after Gamma Knife radiation therapy for nasopharyngeal carcinoma (NPC). The patient was a 55-year-old man who was transferred to our hospital with severe repetitive epistaxis...
2016: SpringerPlus
Joao S Soares, Kristen R Feaver, Will Zhang, David Kamensky, Ankush Aggarwal, Michael S Sacks
The use of replacement heart valves continues to grow due to the increased prevalence of valvular heart disease resulting from an ageing population. Since bioprosthetic heart valves (BHVs) continue to be the preferred replacement valve, there continues to be a strong need to develop better and more reliable BHVs through and improved the general understanding of BHV failure mechanisms. The major technological hurdle for the lifespan of the BHV implant continues to be the durability of the constituent leaflet biomaterials, which if improved can lead to substantial clinical impact...
August 9, 2016: Cardiovascular Engineering and Technology
John A Disegi, Michael D Roach, Rod D McMillan, Brian T Shultzabarger
Management of femur fractures requires titanium alloy implants that provide a good combination of static strength and ductility plus sufficient high cycle fatigue strength to resist repetitive loading. A research program was initiated to determine whether aging treatments could increase the strength of alpha + beta Ti-15Mo while maintaining acceptable tensile ductility. A pilot heat treating study indicated the best combination of strength and ductility was obtained using an α + β annealing temperature of 705°C ± 10°C followed by an aging treatment of 482°C ± 10°C...
July 4, 2016: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
K Shemtov-Yona, D Rittel
Metallic dental implants are exposed to various intraoral environments and repetitive loads during service. Relatively few studies have systematically addressed the potential influence of the environment on the mechanical integrity of the implants, which is therefore the subject of this study. Four media (groups) were selected for room temperature testing, namely dry air, saliva substitute, same with 250ppm of fluoride, and saline solution (0.9%). Monolithic Ti-6Al-4V implants were loaded until fracture, using random spectrum loading...
September 2016: Journal of the Mechanical Behavior of Biomedical Materials
William F Zimmerman, Mark A Miller, Richard J Cleary, Timothy H Izant, Kenneth A Mann
The mechanical loads acting across the knee joint following total knee replacements (TKR) during activities of daily living have recently been measured using instrumented TKRs. Using a series of postmortem retrieved TKR constructs we investigated whether these mechanical loads could result in damage to the implant bone interface or supporting bone in the tibia. Eighteen cemented en bloc tibial components (0 to 22 years in service) were loaded under axial compression in increments from 1 to 10 times body weight and digital image correlation was used to measure bone strain and interface micromotion during loading and unloading...
July 5, 2016: Journal of Biomechanics
Polona Pečlin, Janez Rozman, Janez Krajnik, Samo Ribarič
We evaluated the efficacy and robustness of a second generation implantable stimulator for correcting drop foot (DF) in a patient with left-sided hemiplegia over 20 years of functional electrical stimulation (FES) of the common peroneal nerve (CPN). Dorsal flexion and eversion of the affected foot was partially restored by FES of the superficial region of the CPN innervating mostly the tibialis anterior (TA) and partly peroneus longus (PL) and peroneus brevis (PB) muscles. The reasons for implant failure during the long-term follow-up assessment were analyzed and resolving procedures were identified...
April 28, 2016: Artificial Organs
Evgenie D Adamovic, Pavel L Aleksandrov, Oleg V Gradov, Leonid M Mamalyga, Maksim L Mamalyga
AIMS: This paper describes a novel approach to the analysis of electrocardiographic data based on the consideration of the repetitive P, Q, R, S, T sequences as cyclic codes. In Part I we introduce a principle similar to the syndrome decoding using the control numbers, which allows correcting the noise combinations. MATERIALS AND METHODS: We propose to apply the burst-error-correcting algorithms for automatic detection of the ECG artifacts and the functional abnormalities, including those compared to the reference model...
May 2015: Cardiometry
Sebastian Senger, Otto Kollmar, Michael D Menger, Kathrin Rupertus
BACKGROUND: The glycoprotein hormone erythropoietin and its analogue darbepoetin-α (DPO) have been shown to reduce the risk of acute liver failure after major hepatectomy. However, previous experimental studies have also shown that DPO significantly enhances neovascularization and tumor cell proliferation in established colorectal liver metastasis in hepatectomized and nonhepatectomized mice. The present study now analyzes whether DPO influences cell proliferation and migration as well as vascularization and growth of established colorectal metastasis at extrahepatic sites after major hepatectomy...
2016: European Surgical Research. Europäische Chirurgische Forschung. Recherches Chirurgicales Européennes
Christopher R Chapple, Nadir I Osman, Altaf Mangera, Christopher Hillary, Sabiniano Roman, Anthony Bullock, Sheila Macneil
Synthetic or biological materials can be used for the surgical repair of pelvic organ prolapse (POP) or stress urinary incontinence (SUI). While non-degradable synthetic mesh has a low failure rate, it is prone to complications such as infection and erosion, particularly in the urological/gynecological setting when subject to chronic influences of gravity and intermittent, repetitive strain. Biological materials have lower complication rates, although allografts and xenografts have a high risk of failure and the theoretical risk of infection...
May 2015: Lower Urinary Tract Symptoms
Jawaad Sheriff, Phat L Tran, Marcus Hutchinson, Tracy DeCook, Marvin J Slepian, Danny Bluestein, Jolyon Jesty
Implantation of mechanical circulatory support (MCS) devices-ventricular assist devices and the total artificial heart-has emerged as a vital therapy for advanced and end-stage heart failure. Unfortunately, MCS patients face the requirement of life-long antiplatelet and anticoagulant therapy to combat thrombotic complications resulting from the dynamic and supraphysiologic shear stress conditions associated with such devices, whose effect on platelet activation is poorly understood. We developed a syringe-capillary viscometer-the "platelet hammer"-that repeatedly exposed platelets to average shear stresses up to 1000 dyne/cm(2) for as short as 25 ms...
June 2016: Artificial Organs
Tobias Reichlin, Michael Kühne, Christian Sticherling
No abstract text is available yet for this article.
May 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Wolfgang Würfel
Granulocyte colony-stimulating factor (G-CSF) belongs to the family of colony-stimulating factors (CSF). As the name suggests, it was initially identified as being able to target and influence granulopoiesis, but was soon shown to be a ubiquitous growth factor, with synthesis and receptors, such as the related granulocyte macrophage colony-stimulating factor (GM-CSF), which is found in a wide variety of tissue types, including the organs and cell populations involved in reproduction. It must now be assumed that both G-CSF and GM-CSF control, or play a role in controlling, key processes in oocyte and sperm maturation, endometrial receptivity, implantation, and embryo and fetal development, possibly extending to birth...
April 2015: Journal of Reproductive Immunology
Jean A Ouellet, Catherine E Ferland, Guillaume Racloz, Karina Klein, Henning Richter, Thomas Steffen, Brigitte von Rechenberg
STUDY DESIGN: Experimental animal study. OBJECTIVE: To determine biological compatibility, stability, and growth potential of the Trolley Gliding Vehicle (TGV) used in a novel surgical technique for guided spinal growth. SUMMARY OF BACKGROUND DATA: Current treatments for Early Onset Scoliosis (EOS) maintaining spinal growth consist of posteriorly based spinal constructs requiring repetitive lengthening. Such interventions have a high rate of complications...
February 25, 2015: Journal of Spinal Disorders & Techniques
Ehtesham Ul Haq, Bassam Omar
Background. Tension pneumothorax can infrequently cause ventricular arrhythmias and increase the threshold of defibrillation. It should be suspected whenever there is difficulty in defibrillation for a ventricular arrhythmia. Purpose. To report a case of traumatic tension pneumothorax leading to ventricular tachycardia and causing defibrillator failure. Case. A 65-year-old African-American female was brought in to our emergency department complaining of dyspnea after being forced down by cops. She had history of mitral valve replacement for severe mitral regurgitation and biventricular implantable cardioverter defibrillator inserted for nonischemic cardiomyopathy...
2014: Case Reports in Cardiology
Saurabh Kumar, William G Stevenson, Roy M John
Ventricular arrhythmias (VA) are a significant contributor to morbidity and mortality in patients with heart failure (HF). Implantable cardioverter defibrillators are effective in reducing mortality, but do not prevent arrhythmia recurrence. There is increasing recognition that frequent premature ventricular contractions or repetitive ventricular tachycardia may also lead to new onset ventricular dysfunction or deterioration of ventricular function in patients with pre-existing HF. Suppression of the arrhythmia may lead to recovery of ventricular function...
September 2014: Current Cardiology Reports
Enrico Vizzardi, Edoardo Sciatti, Ivano Bonadei, Antonio D'Aloia, Antonio Curnis, Marco Metra
AIMS: Obstructive sleep apnoea-hypopnoea (OSAH) is a prevalent condition characterized by repetitive pharyngeal collapse during sleep, leading to hypoxemia, hypercapnia, and persistent inspiratory efforts against an occluded airway until arousal. Several studies demonstrated that OSAH exerts acute and chronic effects on the cardiovascular system. Thus, although being a respiratory problem, the most important consequences of OSAH are cardiovascular, among which there are arrhythmias. The purpose of this review is to systematically analyse what has been recently published about the relationship between OSAH and every cardiac arrhythmia separately...
July 3, 2014: Journal of Cardiovascular Medicine
Hozan Mufty, Alfred Janssen, Stijn Schepers
INTRODUCTION: Stenosis of the subclavian artery is uncommon and it rarely causes symptoms. Only symptomatic patients should be treated. PRESENTATION OF CASE: We report a case of chronic left upper limb ischemia caused by subclavian artery stenosis after repetitive clavicular fixation. The stenosis was first treated with carotid-subclavian bypass and soon followed by angioplasty and stenting of the subclavian artery because of occlusion of the bypass. Finally, failure of these procedures necessitated a subclavian-axillary crossover bypass...
2014: International Journal of Surgery Case Reports
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