Postharvest conservation of Formosa 'Tainung 1' papaya under refrigeration, modified atmosphere, and chitosan

The objective of this work is to evaluate the use of modified atmosphere and chitosan as an alternative to chemical treatment in postharvest conservation of 'Tainung 1' papaya under refrigeration. The experiment comprised of completely randomized blocks with four replications, one fruit per replication, with a 2 × 4 × 4 factorial design as follows: two types of packaging (with or without polyvinyl chloride [PVC] stretchable film, thickness of 17 µm), four treatments (control, 2% chitosan, 4% chitosan, and prochloraz fungicide with 33.75 g a.i.·100 L­1), and four storage periods (0, 7, 14, and 21 days) at 10 °C and relative humidity (RH) of 90 ± 5%. The variables evaluated were mass loss (ML), external appearance, titratable acidity (TA), soluble solids (SS), vitamin C, reducing sugars (RS), and total sugars (TS). The storage of 'Formosa' papaya under refrigeration at 10 °C and RH of 90 ± 5% associated with PVC provided a low percentage of ML and longer conservation time of apparent quality (up to 7 days) in relation to fruits with no storage in PVC. The external appearance of fruits was preserved for up to 14 days by the PVC + 4% chitosan treatment and for up to 21 days by the PVC + prochloraz fungicide treatment. The treatment PVC + 4% chitosan associated with refrigeration is efficient in maintaining fruit quality. It is, for up to 14 days, a viable alternative to the use of prochloraz fungicide for postharvest conservation of 'Formosa' papaya.

Reusable Enzymatic Strip for Detection of Arsenic

HIGHLIGHTS Arsenic is considered as one of the highly hazardous elements in the environment and a serious carcinogen for the human health. An enzymatic method has been described by using arsenite oxidase for arsenic detection. Residual activity of the immobilized enzyme was 43% of the initial activity after being recycled 10 times.

Abstract Arsenic is considered as one of the highly hazardous elements in the environment and a serious carcinogen for the human health. More attention has taken towards the arsenic due to its presence in ground water in India, China, Bangladesh, Inner Mongolia and several other regions of the world. It's been a challenge to remove arsenic due to the lack of its efficient detection approach in the complicated environmental matrix. The proposed method describes an enzymatic method for arsenic determination using arsenite oxidase, which catalyzes the oxidation of arsenite to arsenate. Hence, a colorimetric PVC strip with immobilized arsenite oxidase has been developed to detect the arsenic concentration and also having potential for the field-testing. The influence of the optimal conditions i.e. pH, temperature, storage stability, and reusability of free and immobilized enzyme were evaluated and compared. The results have shown that the stabilities were significantly enhanced compared with free counterpart. Residual activity of the immobilized enzyme was 43% of the initial activity after being recycled 10 times. We approve that this novel low cost immobilized carrier presents a new approach in large scale applications and expected to act as a model for establishment of indigenous arsenic sensor in miniature form.

Experimental Study on Migration Parameters of DEHP in PVC Infusion / 中国医疗器械杂志

The work explored the DEHP migration parameters in PVC infusion in clinic,based on the previous research on the test model of DEHP migrated from PVC infusion,to assess the safety of PVC infusion.The leaching solution samples in different conditions were evaluated by analysis of the DEHP in leaching solution using GC-MS under simulated clinical transfusion way.The release behavior of DEHP was significantly affected by the storage time,storage temperature,surrounding temperature,dripping speed,sterilization process,volume of the leaching solution,and the property of the leaching solution.

Comparison of displacement of polyvinyl chloride and silicone left-sided double-lumen tubes during lateral positioning / 대한마취과학회지

BACKGROUND: Compared to an equivalent sized polyvinyl chloride (PVC) double-lumen tube (DLT), a silicone DLT has a shorter endobronchial segment. The aim of this study was to compare the incidence of clinically significant displacement of left-sided PVC and silicone DLTs after a positional change to a lateral position from a supine position and determine its effect on the need for DLT repositioning for successful lung separation in patients undergoing thoracic surgery. METHODS: One hundred eight adult patients requiring one-lung ventilation were randomly divided into group P (PVC DLT, n = 54) and group S (Silicone DLT, n = 54). The position of the DLT was observed before and after lateral positioning to assess the effect of the position change. The incidence of clinically significant displacement (>10 mm) of DLT was compared between the groups. RESULTS: DLTs were clinically significantly displaced in group P (17/48, 35.4%) and group S (18/52, 34.6%) after lateral positioning (p = 0.933). A proximal displacement (31.3% [group P] and 25.0% [group S]) was more common than distal displacement (4.2% [group P] and 9.6% [group S]), with no significant intergroup difference (p = 0.494). After lateral positioning, critical malposition of DLT with bronchial herniation to the right main bronchus was 8.3% (group P) and 7.9% (group S, p = 0.906). CONCLUSION: Left-sided PVC and silicone DLTs produced comparable incidences of clinically significant displacement and, consequently, required similar rates of repositioning for successful lung separation after lateral positioning.

Prediction of air inflow during central venous catheter insertion: experimental study

OBJECTIVE: This study examined the incidence and amount of air inflow during central venous catheter (CVC) insertion. METHODS: This study was an experimental study aimed at designing an apparatus to implement blood vessel and blood flow in the human body. A 1.5-m long core tube with a Teflon tube, suction rubber tube, and polyvinyl chloride tube were made. This core tube was assumed to be the blood vessel of the human body. Blood was replaced with a saline solution. The saline solution was placed higher than the core tube and flowed into the inside of the tube by gravity. The CVC was injected 15-cm deep into the core tube. The air was collected through a 3-way valve into the upper tube. The experiments were carried out by differentiating the pressure in the tube, CVC insertion step, and diameter of the end of the catheter. The experiment was repeated 10 times under the same conditions. RESULTS: The amount of air decreased with increasing pressure applied to the tube. Air was not generated when the syringe needle was injected, and the amount of air increased with increasing size of the distal end catheter. CONCLUSION: To minimize the possibility of air embolism, it is necessary to close the distal end catheter at the earliest point as soon as possible.

Research on Experimental Model of Security Assessment of DEHP Migration from PVC-Tubes Medical Devices / 中国医疗器械杂志

As we all know, DEHP is seriously harmful to human health and consequently has been acquired critical attention. DEHP is able to migrate from PVC medical devices for the non-chemically bound to PVC, thus contact with user and patient. The DEHP migration is influenced by various parameters. In order to assess the security of PVC-tubes medical devices scientifically of DEHP migration, we develop an experimental model by analyzing the parameters comprehensively and systematically, taking into account the clinical practices. For example, assessing the security of DEHP migration from infusion sets by utilizing this model.

Application and Safety Evaluation of DEHP in PVC Medical Devices / 中国医疗器械杂志

DEHP is largely used in soft PVC products as the plasticizer, which is also widely applied in medical devices. Due to its potential and widespread toxicity and medical devices' specific use, the safety of DEHP's application in medical devices has received extensive attention. In this paper, a comprehensive review of the application and potential toxicity of DEHP in PVC medical devices is made on the basis of the research results all over the world. Besides, the safety evaluation in medical devices is discussed and some possible coping strategies are explored.

Comparison of Intubation Efficiency by Suction Device in a Hemorrhagic Airway Manikin Model: Yankauer Suction Tip vs. Polyvinyl Chloride Catheter Suction Tip

PURPOSE: Tracheal intubation in a hemorrhagic airway is a difficult procedure because the visibility can be obscured by blood or vomitus. Several devices and methods have been developed to overcome such obstacles, but they are not available at all practical sites. Therefore, this study was conducted to assess the time and success rate of tracheal intubation according to the type of suction tip used in a hemorrhagic airway manikin model. METHODS: This study was a randomized crossover manikin simulation study. We recruited 18 emergency physicians to perform intubation with suction using a Yankauer suction tip and a polyvinyl chloride (PVC) catheter suction tip in a hemorrhagic airway manikin model. We then measured the time and success rate of intubation for each suction tip. RESULTS: The mean intubation time using the Yankauer suction tip was 42.3 seconds, and the mean intubation time using the PVC catheter suction tip was 91.1 seconds (p < 0.001). Two cases of esophageal intubation occurred when the PVC catheter suction tip was used (success rate, 88.9%). In contrast, there was no esophageal intubation when the Yankauer suction tip was used (success rate, 100%) (p=0.217). CONCLUSION: Intubation of a hemorrhagic airway manikin model can be performed in a shorter time when a Yankauer suction tip is used than when a PVC catheter suction tip is used.

Comparative study of abdominal cavity temporary closure techniques for damage control / Estudo comparativo de técnicas de fechamento temporário da cavidade abdominal durante o controle de danos

ABSTRACT The damage control surgery, with emphasis on laparostomy, usually results in shrinkage of the aponeurosis and loss of the ability to close the abdominal wall, leading to the formation of ventral incisional hernias. Currently, various techniques offer greater chances of closing the abdominal cavity with less tension. Thus, this study aims to evaluate three temporary closure techniques of the abdominal cavity: the Vacuum-Assisted Closure Therapy - VAC, the Bogotá Bag and the Vacuum-pack. We conducted a systematic review of the literature, selecting 28 articles published in the last 20 years. The techniques of the bag Bogotá and Vacuum-pack had the advantage of easy access to the material in most centers and low cost, contrary to VAC, which, besides presenting high cost, is not available in most hospitals. On the other hand, the VAC technique was more effective in reducing stress at the edges of lesions, removing stagnant fluids and waste, in addition to acting at the cellular level by increasing proliferation and cell division rates, and showed the highest rates of primary closure of the abdominal cavity.

RESUMO A cirurgia de controle de danos, com ênfase em peritoneostomia, geralmente resulta em retração da aponeurose e perda da capacidade de fechar a parede abdominal, levando à formação de hérnias ventrais incisionais. Atualmente, várias técnicas oferecem maiores chances de fechamento da cavidade abdominal, com menor tensão. Deste modo, este estudo tem por objetivo avaliar três técnicas de fechamento temporário da cavidade abdominal: fechamento a vácuo (Vacuum-Assisted Closure Therapy - VAC), Bolsa de Bogotá e Vacuum-pack. Realizou-se uma revisão sistemática da literatura com seleção de 28 artigos publicados nos últimos 20 anos. As técnicas de Bolsa de Bogotá e Vacuum-pack tiveram como vantagem o acesso fácil ao material, na maioria dos centros, e baixo custo, ao contrário do que se observa na terapia a vácuo, VAC, que além de apresentar alto custo, não está disponível em grande parte dos hospitais. A técnica VAC, por outro lado, foi mais eficaz na redução da tensão nas bordas das lesões, ao remover fluidos estagnados e detritos, além de exercer ação a nível celular, aumentando as taxas de proliferação e divisão celular, e apresentou as maiores taxas de fechamento primário da cavidade abdominal.

Evaluación sanitaria de factores de riesgos físicos en viviendas Petrocasas bajo un cambio de cubierta / Health evaluation of physical risk factors in petrohouses after roof replacement

Introducción: el problema de la vivienda tiene un alcance mundial. La solución del déficit cualitativo y cuantitativo de la vivienda en Cuba transita a través de diferentes soluciones. Varios asentamientos del país se han erigido con vivienda industrial prefabricada de cloruro de polivinil ­PVC- conocidas por Petrocasas. Algunos estudios reportan estrés térmico en estas viviendas, vinculado a débil ventilación y calentamiento de cierres expuestos al sol. Objetivo: realizar una evaluación de salud ambiental en factores de riesgos físicos en el ambiente interior de las viviendas relativo a la intemperie, tras un cambio del material de cubierta. Método: se plantea un estudio experimental evaluativo de factores de riesgos físicos en el ambiente interior de las viviendas petrocasas a partir de una propuesta de modificación del material de la cubierta con la intención de reducir el estrés térmico de las mismas. Fueron edificadas con este propósito dos viviendas petrocasas con igual orientación de fachada principal y diferente cubierta; ;una fue sustituida por poliestireno expandido y la otra mantiene cubierta original (aluminio y papel de asfalto).Se evaluaron comparativamente factores de riesgos físicos: ruido, componente magnético del campo electromagnético de baja frecuencia, iluminación natural, artificial, ventilación y, principalmente, microclima para valorar la eficacia del cambio introducido. La evaluación estadística se efectuó por descriptores, modelos de regresión y espectro de potencia bivariado con los paquetes estadísticos SPSS v. 17.0 y Statistica 8.0. Resultados: la vivienda Petrocasa con cubierta de aluminio ­ asfalto presenta un clima interior algo más desfavorable al bienestar térmico que aquella de poliestireno; la ventilación en ambas resulta deficiente. Conclusiones: el cambio de material de la cubierta ligera de la vivienda Petrocasa proporciona un clima interior algo más favorable al bienestar de sus residentes(AU)

Introduction: the housing problem is global in scope. Solution to qualitative and quantitative housing deficit in Cuba has been addressed from various different perspectives. Several settlements in the country have been built with prefabricated industrial houses made of polyvinyl chloride (PVC). These are known as petrohouses. Some studies have reported thermal stress inside these houses, resulting from insufficient ventilation and the heating of roofs exposed to the sun. Objective: carry out an environmental health evaluation of physical risk factors present in the indoor environment of petrohouses as compared with the outside environment after roof replacement. Method: an experimental evaluative study was conducted of physical risk factors present in the indoor environment of petrohouses based on a proposal of modification of the roof material with the purpose of reducing thermal stress. For this purpose, two petrohouses were built with the same orientation of their main facade, but different roof material. One was roofed with expanded polystyrene, while the other retained its original roof (aluminum sheets and asphalt paper). The following physical risk factors were evaluated comparatively: noise, magnetic component of the low frequency electromagnetic field, natural and artificial lighting, ventilation, and mainly microclimate, to evaluate the efficacy of the change made. Statistical evaluation was conducted with descriptors, regression models and bivariate power spectrum, using the statistical software packages SPSS v. 17.0 and Statistica v. 8.0. Results: indoor environment in the petrohouse with an aluminum-asphalt roof is somewhat more unfavorable in terms of thermal welfare than in the polystyrene-roofed house. Ventilation is deficient in both. Conclusions: roof replacement in petrohouses provides an indoor environment somewhat more favorable to the welfare of dwellers(AU)

comparison of conventional endotracheal tube with silicone wire-reinforced tracheal tube for intubation through intubating laryngeal mask airway

A specially designed wire-reinforced endotracheal tube - the Fastrach silicone tube [FTST] designed to facilitate endotracheal intubation through intubating laryngeal mask airway [ILMA] are expensive and not readily available. Hence, it is worth considering alternative such as polyvinyl chloride tracheal tube [PVCT], which is disposable, cheap and easily available. The aim of the present study was to compare the clinical performance of FTST with conventional PVCT for tracheal intubation through ILMA. After informed consent, 60 ASA I-II adults with normal airway undergoing elective surgery were randomly allocated to undergo blind tracheal intubation through ILMA with a FTST or conventional PVCT. Overall success rate, ease of insertion, number of attempts for successful intubation, critical incidence during intubation and post-operative sore throat were compared. The overall success rate with FTST was 96.63% and 93.33% with PVCT; in addition, the first attempt success rate was 86.25% with FTST compared to 82.14% with PVCT. The time taken for intubation was 18.6 +/- 6.8 s. in FTST group and 22.42 +/- 8.5 s. in PVCT group. Incidence of sore throat was 21.42% in PVCT group compared with 6.89% in FTST group. Blind tracheal intubation through an ILMA with the conventional PVCT instead of FTST is a feasible alternative in patients with normal airways.

Embolia gasosa venosa inadvertida durante cesariana: bolsas retráteis ​​para líquidos intravenosos sem saídas autovedantes oferecem riscos. Relato de caso / Inadvertent venous air embolism during cesarean section: collapsible intravenous fluid bags without self-sealing outlet have risks. Case report / Embolia gaseosa venosa inadvertida durante cesárea: bolsas retráctiles para líquidos intravenosos sin salida de autosellado ofrecen riesgos. Relato de caso

O anestesiologista deve estar ciente das causas, do diagnóstico e do tratamento de embolia venosa e adotar padrões de prática para prevenir sua ocorrência. Embora a embolia gasosa seja uma complicação conhecida da cesariana, descrevemos um caso raro de desatenção que causou embolia gasosa iatrogênica quase fatal durante uma cesariana sob raquianestesia. uma das razões para o uso de bolsas autorretráteis para infusão em vez dos frascos convencionais de vidro ou plástico é a precaução contra embolia gasosa. Também demonstramos o risco de embolia venosa com o uso de dois tipos de bolsas plásticas retráteis (à base de cloreto de polivinil [PVC] e de polipropileno) para líquidos intravenosos. As bolsas para líquidos sem saídas autovedantes apresentam risco de embolia gasosa se o sistema de fechamento estiver quebrado, enquanto a flexibilidade da bolsa limita a quantidade de entrada de ar. bolsas à base de pvc, que têm mais flexibilidade, apresentam risco significativamente menor de entrada de ar quando o equipo de administração intravenosa (IV) é desconectado da saída. usar uma bolsa pressurizada para infusão rápida sem verificar e esvaziar todo o ar da bolsa IV pode ser perigoso.

The anesthesiologist must be aware of the causes, diagnosis and treatment of venous air embolism and adopt the practice patterns to prevent its occurrence. Although venous air embolism is a known complication of cesarean section, we describe an unusual inattention that causes iatrogenic near fatal venous air embolism during a cesarean section under spinal anesthesia. One of the reasons for using self-collapsible intravenous (IV) infusion bags instead of conventional glass or plastic bottles is to take precaution against air embolism. We also demonstrated the risk of air embolism for two kinds of plastic collapsible intravenous fluid bags: polyvinyl chloride (PVC) and polypropylene-based. Fluid bags without self-sealing outlets pose a risk for air embolism if the closed system is broken down, while the flexibility of the bag limits the amount of air entry. PVC-based bags, which have more flexibility, have signifi cantly less risk of air entry when IV administration set is disconnected from the outlet. Using a pressure bag for rapid infusion can be dangerous without checking and emptying all air from the IV bag.

El anestesiólogo debe de estar consciente de las causas, del diagnóstico y del tratamiento de la embolia venosa, y adoptar los estándares de práctica para prevenir su aparecimiento. Aunque la embolia gaseosa sea una complicación conocida de la cesárea, describimos aquí un caso raro de falta de atención que causó embolia gaseosa iatrogénica casi fatal durante una cesárea bajo raquianestesia. Una de las razones para el uso de bolsas autoretráctiles para infusión en vez de los frascos convencionales de vidrio o plástico, es la precaución contra la embolia gaseosa. También demostramos riesgo de embolia venosa con el uso de dos tipos de bolsas plásticas retráctiles (a base de cloruro de polivinil [PVC] y de polipropileno) para líquidos intravenosos. Las bolsas para líquidos sin salidas de autosellado, tienen un riesgo de embolia gaseosa si el sistema de cierre está roto, mientras la flexibilidad de la bolsa limita la cantidad de entrada de aire. Bolsas hechas a base de PVC, y que tienen más flexibilidad, también tienen un riesgo signifi cativamente menor de entrada de aire cuando el equipo de administración intravenosa (IV) se apaga en la salida. Usar una bolsa de presión para la infusión rápida sin verifi car y vaciar todo el aire de la bolsa IV puede ser peligroso.

Técnicas anatômicas no ensino da prática de anatomia animal / Anatomical techniques in the animal anatomy practice teaching

A preocupação quanto a conservação de peças anatômicas existe a mais de 5 mil anos, pois o uso de peças cadavéricas são indispensáveis para o ensino, contribuindo com a melhora das habilidades aplicativas, assimilativas e compreensivas da disciplina. Esse trabalho propõe maior utilização das técnicas apresentadas em laboratórios de anatomia, visando abolir o uso do formol como conservante, permitindo um ambiente agradável para a prática da relação ensino-aprendizagem. Para isso foram utilizadas quatro técnicas anatômicas, a criodesidratação, glicerinação, injeção de látex e injeção de vinilite seguido de corrosão, que foram executadas utilizando cães, gatos e órgãos provenientes de doações. Com a criodesidratação e glicerinação os materiais anatômicos ficaram consideravelmente mais leves do que eram quando mantidos em formol, mantendo-se inodoros, diferente do evidenciado na utilização de formol e outros conservantes. As estruturas de estudo das peças ficaram intactas, de fácil visualização e o armazenamento passou a ser feito em caixas fechadas sem qualquer tipo de liquido, mantendo-se assim por até 3 anos. As técnicas de injeção de látex e vinilite seguido de corrosão mostraram total eficiência preenchendo os sistemas injetados, podendo visualizar as ramificações e todo caminho percorrido no sistema circulatório. As quatro técnicas anatômicas estudadas nesse trabalho mostraram ser suficientes para atender as necessidades dos estudantes quanto ao estudo da anatomia, devido à perfeita evidenciação de estruturas externas e internas dos animais.

The concern about preservation of anatomical specimens in existence for over 5000 years, since the use of anatomical parts, are indispensable for teaching and contribute for the improvement of applicative, assimilative skills and understanding of the discipline. This paper proposes better use of techniques in anatomy laboratories, to abolish the use of formaldehyde as preservative, allowing a pleasant environment for the practice of teaching/learning relationship. For this purpose, we used four anatomical techniques, (1) the cryodehydration, (2) glycerin conservation, (3) latex injection and (4) vinylite injection followed corrosion, we executed using dogs, cats and organs from donations. With cryodehydration and glycerin conservation the anatomical materials were considerably lighter than when kept in formaldehyde, odorless unlike in the use of formaldehyde and other preservatives. The structures to be studied were kept intact, easily to view, and the specimens could be stored in closed boxes without any liquid, thus remaining for up to 3 years. The Injection techniques (latex and vinylite followed by corrosion) showed total efficiency to inject filling systems, and allowed a clear view of all ramifications and paths of the circulatory system. The four anatomical techniques studied were shown to be sufficient to meet the needs of students to study anatomy due to the perfect disclosure of external and internal animal structures.

Citotoxicidade de tubos de PVC esterilizados em óxido de etileno após exposição à radiação gama / Cytotoxicity of PVC tubes sterilized in ethylene oxide after gamma radiation exposure / Citotoxicidad de tubos de PVC esterilizados en óxido de etileno luego de exposición a la radiación gamma

Materiais esterilizados em raios gama, ao serem re-esterilizados em óxido de etileno (EO), formam substâncias tóxicas? Esta questão norteou o objetivo deste estudo, que foi investigar o potencial efeito citotóxico do PVC esterilizado em radiação gama e re-esterilizado em EO pelo método da difusão em ágar em culturas celulares. Nove tubos de PVC foram submetidos à esterilização em radiação gama e re-esterilizados em EO. Os tubos foram divididos em um total de 81 unidades de análise, que foram testadas de forma a representar as superfícies internas, externas e massa de cada tubo. Concluiu-se que os materiais de PVC esterilizados em Radiação Gama e consecutivamente re-esterilizados em EO não são citotóxicos.

Do materials sterilized using gamma rays become toxic when re-sterilized in ethylene oxide? This question guided the objective of this study, which was to investigate the potential cytotoxic effect of PVC sterilized by gamma radiation and re-sterilized with EO by the agar diffusion method in cell cultures. Nine PVC tubes were subjected to gamma radiation sterilization and were re-sterilized in EO. The tubes were divided into a total of 81 units of analysis that were tested so as to represent the internal and external surfaces and mass of each tube. It was concluded that the PVC materials sterilized in gamma radiation and re-sterilized in EO are not cytotoxic.

Los materiales esterilizados con rayos gama, al ser re-esterilizados en óxido de etileno (EO), ¿forman substancias tóxicas? Esta pregunta orientó el objetivo del presente estudio, que fue investigar el potencial efecto citotóxico del PVC esterilizado en radiación gamma y re-esterilizado en EO por el método de difusión en agar en cultivos celulares. Nueve tubos de PVC fueron sometidos a esterilización por radiación gamma y re-esterilizados en EO. Se les aplicaron en total 81 unidades de análisis, las cuales fueron testeadas de manera tal de representar las superficies internas, externas y la masa de cada tubo. Se concluyó en que los materiales de PVC esterilizados con Radiación Gamma y, posteriormente, con EO, no son citotóxicos.

Comparison of prophylactic effects of polyurethane cylindrical or tapered cuff and polyvinyl chloride cuff endotracheal tubes on ventilator-associated pneumonia

Because microaspiration of contaminated supraglottic secretions past the endotracheal tube cuff is considered to be central in the pathogenesis of pneumonia, improved design of tracheal tubes with new cuff material and shape have reduced the size and number of folds, which together with the addition of suction ports above the cuff to drain pooled subglottic secretions leads to reduced aspiration of oropharyngeal secretions. So we conducted a study to compare the prophylactic effects of polyurethane-cylindrical or tapered cuff and polyvinyl chloride cuff endotracheal tubes [ETT] on ventilator-associated pneumonia. This randomized clinical trial was carried out in a 12 bed surgical intensive care unit. 96 patients expected to require mechanical ventilation more than 96 hours were randomly allocated to one of three following groups: Polyvinyl chloride cuff [PCV] ETT, Polyurethane [PU] cylindrical Sealguard ETT and PU Taperguard ETT. Cuff pressure monitored every three hours 3 days in all patients. Mean cuff pressure didn't have significant difference between three groups during 72 hours. Pneumonia was seen in 11 patients [34%] in group PVC, 8 [25%] in Sealguard and 7 [21%] in Taperguard group. Changes in mean cuff pressure between Sealguard and PVC tubes and also between Taperguard and PVC tubes did not show any significant difference. There was no significant difference in overinflation between three groups. The use of ETT with PU material results in reducing ventilator-associated pneumonia compared to ETT with PVC cuff. In PU tubes Taperguard has less incidence of ventilator-associated pneumonia compared to Sealguard tubes

Case Report of Occupational Asthma Induced by Polyvinyl Chloride and Nickel

Polyvinyl chloride (PVC) is a widely used chemical for production of plastics. However occupational asthma (OA) caused by PVC has been reported only rarely. We report a 34-yr-old male wallpaper factory worker with OA due to PVC and nickel (Ni) whose job was mixing PVC with plasticizers. He visited the emergency room due to an asthma attack with moderate airflow obstruction and markedly increased sputum eosinophil numbers. A methacholine challenge test was positive (PC20 2.5 mg/mL). Bronchoprovocation tests with both PVC and Ni showed early and late asthmatic responses, respectively. Moreover, the fractional concentration of exhaled nitric oxide (FeNO) was increased after challenge with PVC. To our knowledge, this is the first case of OA in Korea induced by exposure to both PVC and Ni. We suggest that eosinophilic inflammation may be involved in the pathogenesis of PVC-induced OA and that FeNO monitoring can be used for its diagnosis.

Diseño y elaboración de una férula tipo tenodesis fabricada en termoplástico de alta resistencia policloruro de vinilo PVC para la promoción de agarre de pinza trípode en personas con secuelas de trauma raquimedular / Design and development of a kind tenodesis splint made in high resistance thermoplastic polyvinyl chloride PVC to promote tripod clamp grip in people with spinal cord trauma aftermath

El presente documento es una propuesta teórica, que tiene como finalidad presentar un protocolo de elaboración de una férula dinámica tipo tenodesis a partir de un material termoplástico de alta temperatura, de fácil consecución en el mercado llamado policloruro de vinilo; Este tipo de férula se clasifica dentro de las denominadas férulas dinámicas y su objetivo final es la promoción de agarre de pinza trípode en personas que por lesiones a nivel de C5-C6, presentan ausencia de movilidad en los dedos de la mano pero conservan movimientos de muñeca. Cuando el usuario extiende la muñeca, la férula activa una serie de mecanismos que producen flexión pasiva de articulaciones metacarpofalangicas de los dedos II y III y simultáneamente hay una abducción y una relativa oposición del pulgar; estos movimientos formarán una pinza que proveerá al usuario la posibilidad de realizar actividades básicas con sus manos.

This document is a methodological contribution, which is to present a protocol for developing a tenodesis type dynamic splint from a high temperature thermoplastic material, easy to achieve on the market called polyvinyl chloride, this type of splint is classified within the so-called dynamic splints and its purpose is to promote tripod pincer grip in people with injuries at C5-C6, present lack of mobility in the fingers but retain wrist movements. When the user extends the wrist, splint activates a series of mechanisms that produce passive flexion of metacarpophalangeal joints of fingers II and III and simultaneously there is a relative abduction and thumb opposition, these movements form a clamp that will provide the user the ability to perform basic activities with their hands.

Safety assessment of DEHP from PVC medical devices / 中国医疗器械杂志

<p><b>OBJECTIVE</b>To Investigate necessity of safety evaluation, research ideas, evaluation methods of DEHP in PVC medical devices.</p><p><b>METHODS</b>The ideas of The United States, Japan and the European Union on safety evaluation of DEHP in PVC medical devices was reviewed and sorted, regarding to currently requirements for PVC medical devices in our country, the research ideas and methods of DEHP in PVC medical devices was explored.</p><p><b>RESULTS</b>DEHP released from High-risk PVC medical devices may exceed human tolerance intake values and thus potentially be harmful to human health. So it is necessary for production enterprise to assess safety of DEHP in PVC medical device. The assessment can be done by material control and detecting release of DEHP from PVC medical devices.</p><p><b>CONCLUSION</b>In order to assess safety of DEHP in PVC medical device, production enterprise can firstly assess materials according to national standard. Secondly, production enterprise can detect release of DEHP from PVC medical devices simulating clinical application. By comparing release of DEHP from PVC medical devices and TI, safety of DEHP in PVC medical device can be evaluated.</p>

Retrograde Intubation in Patients with Severe Cervical Ankylosing Spondylitis: A Laryngeal Mask Airway (LMA) Combined Technique

Occurrence of cervical spineankylosis is rare, and intubation of patients with this condition can be difficult, particularly when fiberoptic laryngoscopy is not available. We performed successful endotracheal intubation in a 64-year-old male patient using a 7-mm cuffed polyvinyl chloride (PVC) tube with the help of a laryngeal mask airway (LMA). The LMA was initially used for rapid ventilation of the patient, and the guide wire was passed into the airway from the site of puncture of the cricothyroid membrane. This wire was easily observed in the LMA tube, and the use of long forceps was not required.

Preparation and antithrombogenicity of oxidated low molecular weight heparin-antithrombin complex coated-polyvinyl chloride tubing / 生物医学工程学杂志

Based on non-enzymatic protein glycated reaction, the sodium periodate-oxidated low molecular weight heparin-antithrombin covalent complex (SPLMWATH) was produced. By using polyethyleneimine-glutaraldehyde bonding technique, polyvinyl chloride (PVC) tubings were coated with SPLMWATH, heparin and low molecular weight heparin (LMWH). Spectrophotometry and dynamic clotting time experiment were used to determine the synthetic ratio of SPLMWATH, graft density, coating leaching ratio and to evaluate the antithrombogenicity of different coating on the PVC tubings. The results showed that the synthetic ratio of SPLMWATH was approximately 55%, and compared with heparin coating and LMWH coating, the graft density of SPLMWATH coating on the PVC tubing was smaller, but its coating stability and antithrombogenicity were significantly better than that of heparin coating and LMWH coating on the PVC tubings.