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https://www.readbyqxmd.com/read/28212401/preload-based-starling-like-control-of-rotary-blood-pumps-an-in-vitro-evaluation
#1
Mahdi Mansouri, Shaun D Gregory, Robert F Salamonsen, Nigel H Lovell, Michael C Stevens, Jo P Pauls, Rini Akmeliawati, Einly Lim
Due to a shortage of donor hearts, rotary left ventricular assist devices (LVADs) are used to provide mechanical circulatory support. To address the preload insensitivity of the constant speed controller (CSC) used in conventional LVADs, we developed a preload-based Starling-like controller (SLC). The SLC emulates the Starling law of the heart to maintain mean pump flow ([Formula: see text]) with respect to mean left ventricular end diastolic pressure (PLVEDm) as the feedback signal. The SLC and CSC were compared using a mock circulation loop to assess their capacity to increase cardiac output during mild exercise while avoiding ventricular suction (marked by a negative PLVEDm) and maintaining circulatory stability during blood loss and severe reductions in left ventricular contractility (LVC)...
2017: PloS One
https://www.readbyqxmd.com/read/28208345/mechanical-stability-of-particle-stabilized-droplets-under-micropipette-aspiration
#2
Niveditha Samudrala, Jin Nam, Raphaël Sarfati, Robert W Style, Eric R Dufresne
We investigate the mechanical behavior of particle-stabilized droplets using micropipette aspiration. We observe that droplets stabilized with amphiphilic dumbbell-shaped particles exhibit a two-stage response to increasing suction pressure. Droplets first drip, then wrinkle and buckle like an elastic shell. While particles have a dramatic impact on the mechanism of failure, the mechanical strength of the droplets is only modestly increased. On the other hand, droplets coated with the molecular surfactant sodium dodecyl sulfate are even weaker than bare droplets...
January 2017: Physical Review. E
https://www.readbyqxmd.com/read/28208212/the-function-of-the-ocelloid-and-piston-in-the-dinoflagellate-erythropsidinium-gymnodiniales-dinophyceae
#3
Fernando Gómez
The marine dinoflagellate Erythropsidinium possesses an ocelloid, the most elaborate photoreceptor organelle known in a unicellular organism, and a piston, a fast contractile appendage unknown in any other organism. The ocelloid is able to rotate, often before the cell swims. The ocelloid contains lenses that function to concentrate light. The flagellar propulsion is atrophied, and the piston is responsible for locomotion through successive extensions and contractions. During the 'locomotion mode', the contraction is ~4 times faster than the extension...
February 16, 2017: Journal of Phycology
https://www.readbyqxmd.com/read/28208009/impact-of-a-newly-developed-short-double-balloon-enteroscope-on-stent-placement-in-patients-with-surgically-altered-anatomies
#4
Koichiro Tsutsumi, Hironari Kato, Hiroyuki Okada
A newly developed short double-balloon enteroscope with a working channel enlarged to a diameter of 3.2 mm is a novel innovation in stent placement for patients with surgically altered anatomies. Herein, we report three patients in whom this new scope contributed to an efficient technique and ideal treatment. In the first case, the double guidewire technique was efficient and effective for multiple stent placements. In the second case, covered self-expandable metal stent (SEMS) placement, which is the standard treatment for malignant biliary obstruction, could be performed in a technologically sound and safe manner...
February 17, 2017: Gut and Liver
https://www.readbyqxmd.com/read/28203436/chest-physiotherapy-in-mechanically-ventilated-patients-without-pneumonia-a-narrative-review
#5
REVIEW
Herbert D Spapen, Jouke De Regt, Patrick M Honoré
A beneficial adjuvant role of chest physiotherapy (CPT) to promote airway clearance, alveolar recruitment, and ventilation/perfusion matching in mechanically ventilated (MV) patients with pneumonia or relapsing lung atelectasis is commonly accepted. However, doubt prevails regarding the usefulness of applying routine CPT in MV subjects with no such lung diseases. In-depth narrative review based on a literature search for prospective randomized trials comparing CPT with a non-CPT strategy in adult patients ventilated for at least 48 h...
January 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28197030/superperc-a-new-technique-in-minimally-invasive-percutaneous-nephrolithotomy
#6
Kaushik Shah, Madhu Sudan Agrawal, Dilip Kumar Mishra
INTRODUCTION: Percutaneous nephrolithotomy (PCNL) has undergone significant changes in recent years in the quest for improving efficacy and reducing morbidity. Newer minimally-invasive modalities of PCNL such as mini-PCNL, ultra-mini PCNL, and micro-PCNL have evolved with advancement in optics and technology. However, with these newer advancements, migration of small fragments produced with laser lithotripsy remains a concern, which may result in incomplete stone clearance. We describe a new technique of PCNL termed "Superperc", that utilizes suction to remove all the fragments and maintain one-way flow...
January 2017: Indian Journal of Urology: IJU: Journal of the Urological Society of India
https://www.readbyqxmd.com/read/28195419/migratory-flight-behaviour-of-the-pollen-beetle-meligethes-aeneus
#7
Alice L Mauchline, Sam M Cook, Wilf Powell, Jason W Chapman, Juliet L Osborne
BACKGROUND: The field ecology of the pollen beetle Meligethes aeneus and its damaging effects on oilseed rape crops are well understood. However, the flight behaviour of M. aeneus, in particular the drivers for migratory movements across the landscape, is not well studied. We combined three established methodologies; suction traps, vertical-looking radar and high-altitude aerial netting to demonstrate that M. aeneus fly at a range of altitudes at different points during its active season...
February 13, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28194346/safe-and-simplified-salvage-technique-for-exposed-implantable-cardiac-electronic-devices-under-local-anesthesia
#8
Chang Young Jung, Tae Gon Kim, Sung-Eun Kim, Kyu-Jin Chung, Jun Ho Lee, Yong-Ha Kim
BACKGROUND: Skin erosion is a dire complication of implantable cardiac pacemakers and defibrillators. Classical treatments involve removal of the entire generator and lead systems, however, these may result in fatal complications. In this study, we present our experience with a simplified salvage technique for exposed implantable cardiac electronic devices (ICEDs) without removing the implanted device, in an attempt to reduce the risks and complication rates associated with this condition...
January 2017: Archives of Plastic Surgery
https://www.readbyqxmd.com/read/28190985/a-comparison-between-the-tie-over-and-closed-suction-drainage-therapeutic-strategies-in-patients-suffering-from-sacral-pilonidal-sinus
#9
Mojtaba Ahmadinejad, Koorosh Ahmadi, Izadmehr Ahmadinejad, Amir Masoud Hashemian, Peyman Khademhoseini
BACKGROUND AND OBJECTIVES: Pilonidal sinus is a disease in the sacrococcygeal region diagnosed through the purulent discharges of the above-said region. Although the exact pathology and etiology of those suffering from pilonidal is not clear yet, the presence of hair seemingly plays a major role in the process of infection and the granulation tissue. Several techniques have been identified for pilonidal surgery. These techniques primarily fall within two categories: Primary repair and Lay open...
December 2016: International Journal of Biomedical Science: IJBS
https://www.readbyqxmd.com/read/28190802/alternate-spray-coating-for-the-direct-fabrication-of-hydroxyapatite-films-without-crystal-growth-step-in-solution
#10
Satoshi Watanabe, Rei Kashiwagi, Mutsuyoshi Matsumoto
We discuss an alternate spray-coating technique for the direct fabrication of hydroxyapatite films using metal masks, suction-type spray nozzles and two calcification solutions of calcium hydroxide and phosphoric acid aqueous solutions. Hydroxyapatite films were formed only on the hydrophobic surface of the substrates. Scanning electron microscopy and energy dispersive X-ray spectroscopy showed that the spray-coated films consisted of hydroxyapatite nanoparticles. The Ca/P ratio was estimated to be about 1...
February 10, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28188210/management-of-oral-secretions-in-neurological-disease
#11
REVIEW
Alexander J McGeachan, Christopher J Mcdermott
Sialorrhoea is a common and problematic symptom that arises from a range of neurological conditions associated with bulbar or facial muscle dysfunction. Drooling can significantly affect quality of life due to both physical complications such as oral chapping, and psychological complications such as embarrassment and social isolation. Thicker, tenacious oral and pharyngeal secretions may result from the drying management approach to sialorrhoea. The management of sialorrhoea in neurological diseases depends on the underlying pathology and severity of symptoms...
February 10, 2017: Practical Neurology
https://www.readbyqxmd.com/read/28187769/gastric-perforation-following-cytoreductive-surgery-and-perioperative-intraperitoneal-chemotherapy-a-case-series-of-six
#12
Lee S Kyang, Nayef A Alzahrani, Jing Zhao, David L Morris
BACKGROUND: Incidence of gastric perforation following cytoreductive surgery (CRS) and perioperative intraperitoneal chemotherapy (PIC) is not widely reported. METHODS: Suitable patients were identified from our database of 1028 procedures. Relevant information was then gathered via medical records and operation reports for these patients. RESULTS: Six patients suffered early postoperative gastric perforation following the procedure (0.58%), all of whom received heated intraoperative intraperitoneal chemotherapy (HIPEC)...
February 10, 2017: World Journal of Surgical Oncology
https://www.readbyqxmd.com/read/28186817/velocity-field-in-a-vertical-foam-film
#13
Jacopo Seiwert, Ronan Kervil, Soniraks Nou, Isabelle Cantat
The drainage of vertical foam films governs their lifetime. For a foam film supported on a rectangular solid frame, when the interface presents a low resistance to shear, the drainage dynamics involves a complex flow pattern at the film scale, leading to a drainage time proportional to the frame width. Using an original velocimetry technique, based on fluorescent foam films and photobleaching, we measure the horizontal and vertical components of the velocity in a draining film, thus providing the first quantitative experimental evidence of this flow pattern...
January 27, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28185721/approaches-and-adjuncts-used-by-physiotherapists-when-suctioning-adult-patients-who-are-intubated-and-ventilated-in-intensive-care-units-in-australia-and-new-zealand-a-cross-sectional-survey
#14
Charissa S L Tan, Meg Harrold, Kylie Hill
BACKGROUND: Suctioning is an integral component of care for patients who are intubated and ventilated in an intensive care unit (ICU). There appears to be no published data of physiotherapy suctioning practices in Australia or New Zealand. OBJECTIVE: To describe suctioning practices and the factors which have shaped these practices, of experienced physiotherapists working with adults who are intubated and ventilated in an ICU across Australia and New Zealand. Areas of investigation focused on: (i) suctioning approach (i...
February 6, 2017: Australian Critical Care: Official Journal of the Confederation of Australian Critical Care Nurses
https://www.readbyqxmd.com/read/28182575/response-of-a-physiological-controller-for-ventricular-assist-devices-during-acute-patho-physiological-events-an-in-vitro-study
#15
Anastasios Petrou, Panagiotis Pergantis, Gregor Ochsner, Raffael Amacher, Thomas Krabatsch, Volkmar Falk, Mirko Meboldt, Marianne Schmid Daners
The current paper analyzes the performance of a physiological controller for turbodynamic ventricular assist devices (tVADs) during acute patho-physiological events. The numerical model of the human blood circulation implemented on our hybrid mock circulation was extended in order to simulate the Valsalva maneuver (VM) and premature ventricular contractions (PVCs). The performance of an end-diastolic volume (EDV)-based physiological controller for VADs, named preload responsive speed (PRS) controller was evaluated under VM and PVCs...
February 9, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28180099/the-importance-of-complete-pericardiectomy-and-the-role-of-the-apical-suction-device-in-chronic-constrictive-pericarditis
#16
Sang Yoon Kim, Kwon Joong Na, Kyung-Hwan Kim
BACKGROUND: The aim of this study was to analyze the preoperative attributes and clinical impacts of complete pericardiectomy in chronic constrictive pericarditis. METHODS: A total of 26 patients were treated from January 2001 to December 2013. The pericardium was resected as widely as possible. When excessive bleeding or hemodynamic instability occurred intraoperatively, a cardiopulmonary bypass (CPB; n=3, 11.5%) or an apical suction device (n=8, 30.8%) was used...
February 2017: Korean Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28180050/utility-of-an-ultrasonic-aspirator-in-transcanal-endoscopic-resection-of-temporal-bone-paraganglioma
#17
Brendan P O'Connell, Jacob B Hunter, Matthew L Carlson, Brandon Isaacson, Alejandro Rivas, George B Wanna
The objective of this study was to evaluate the role of removing middle ear paragangliomas using an ultrasonic aspirator (UA) through a transcanal, exclusively endoscopic approach. Three consecutive patients undergoing transcanal endoscopic resection of middle ear paragangliomas using an UA were retrospectively studied. The primary outcome measure was achieving gross total tumor resection. Secondary outcomes included postoperative hearing and early convalescence. Two glomus tympanicum tumors and one small glomus jugulare were included, and complete tumor resection was achieved endoscopically in all cases...
February 2017: Journal of Neurological Surgery. Part B, Skull Base
https://www.readbyqxmd.com/read/28180003/ventilator-associated-pneumonia-and-the-importance-of-education-of-icu-nurses-on-prevention-preliminary-results
#18
REVIEW
Bence Mogyoródi, Erzsébet Dunai, János Gál, Zsolt Iványi
BACKGROUND AND AIMS: Ventilator-associated pneumonia (VAP) increases intensive care unit (ICU) length of stay, ICU mortality, the number of ventilator days, and costs. We implemented a VAP bundle and investigated its efficacy on prevention. MATERIALS AND METHODS: A prospective observational study was conducted between January 1, 2015 and December 31, 2015 in a 12-bed multidisciplinary ICU. The bundle was implemented on July 02, 2015. Comparative analysis was performed before and after the implementation of the bundle...
December 2016: Interventional Medicine & Applied Science
https://www.readbyqxmd.com/read/28177326/supracricoid-laryngectomy-for-recurrent-laryngeal-cancer-after-chemoradiotherapy-a-systematic-review-and-meta-analysis
#19
C A Leone, P Capasso, D Topazio, G Russo
Residual or recurrent laryngeal cancer after irradiation is a difficult clinical problem with a rate that ranges from 13% to 36% of cases. Supracricoid laryngectomy (SCL) with cricohyoidopexy (CHP) or cricohyoidoepiglottopexy (CHEP) provide reliable oncological and functional results for selected primary and recurrent patients with glottic and supraglottic carcinomas. We conducted a systematic review and meta-analysis to assess the oncological and functional outcomes of patients treated with open partial horizontal laryngectomy types IIa and IIb (CHEP, CHP) in terms of the recurrence of squamocellular cancer of the larynx after radiotherapy failure...
December 2016: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/28176865/nitrate-leaching-in-a-winter-wheat-summer-maize-rotation-on-a-calcareous-soil-as-affected-by-nitrogen-and-straw-management
#20
Tao Huang, Xiaotang Ju, Hao Yang
Nitrate leaching is one of the most important pathways of nitrogen (N) loss which leads to groundwater contamination or surface water eutrophication. Clarifying the rates, controlling factors and characteristics of nitrate leaching is the pre-requisite for proposing effective mitigation strategies. We investigated the effects of interactions among chemical N fertilizer, straw and manure applications on nitrogen leaching in an intensively managed calcareous Fluvo-aquic soil with winter wheat-summer maize cropping rotations on the North China Plain from October 2010 to September 2013 using ceramic suction cups and seepage water calculations based on a long-term field experiment...
February 8, 2017: Scientific Reports
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