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PubMed2003

Blue rubber bleb nevus syndrome: case report.

The case of a patient with blue rubber bleb nevus syndrome who is infected by acquired immunodeficiency syndrome virus due to multiple blood transfusions is presented. This case shows that although it is a rare systemic disorder, blue rubber bleb nevus syndrome has to be considered in the differential diagnosis of chronic anemia or gastrointestinal bleeding. Patients should be investigated by endoscopy, which is the most reliable method for detecting these lesions. The patient underwent gastroscopy and enteroscopy via enterotomy with identification of all lesions. Minimal resection of the larger lesions and string-purse suture of the smaller ones involving all the layers of the intestine were performed. The string-purse suture of the lesions detected by enteroscopy proved to be an effective technique for handling these lesions, avoiding extensive intestinal resection and stopping the bleeding. Effective management of these patients demands aggressive treatment and should be initiated as soon as possible to avoid risks involved in blood transfusions, as occurred in this case.

Acquired Immunodeficiency Syndrome↗

PubMed2003

Infrared coagulation versus rubber band ligation in early stage hemorrhoids.

The ideal therapy for early stages of hemorrhoids is always debated. Some are more effective but are more painful, others are less painful but their efficacy is also lower. Thus, comfort or efficacy is a major concern. In the present randomized study, a comparison is made between infrared coagulation and rubber band ligation in terms of effectiveness and discomfort. One hundred patients with second degree bleeding piles were randomized prospectively to either rubber band ligation (N = 54) or infrared coagulation (N = 46). Parameters measured included postoperative discomfort and pain, time to return to work, relief in incidence of bleeding, and recurrence rate. The mean age was 38 years (range 19-68 years). The mean duration of disease was 17.5 months (range 12 to 34 months). The number of male patients was double that of females. Postoperative pain during the first week was more intense in the band ligation group (2-5 vs 0-3 on a visual analogue scale). Post-defecation pain was more intense with band ligation and so was rectal tenesmus (P = 0.0059). The patients in the infrared coagulation group resumed their duties earlier (2 vs 4 days, P = 0.03), but also had a higher recurrence or failure rate (P = 0.03). Thus, we conclude that band ligation, although more effective in controlling symptoms and obliterating hemorrhoids, is associated with more pain and discomfort to the patient. As infrared coagulation can be conveniently repeated in case of recurrence, it could be considered to be a suitable alternative office procedure for the treatment of early stage hemorrhoids.

Adult↗

PubMedDate not supplied

[Diversity and seasonal occurrence of mites (Acari) in a rubber tree crop (Hevea brasiliensis, Muell. Arg.) in northwestern São Paulo, Brazil].

Brazilian southeastern region has soil and climate conditions suitable for the growing of rubber trees, and most part of national yield arises from São Paulo State. The aims proposed for this work were to determine the diversity, the richness and the seasonal occurrence of mites found in a rubber tree crop in a triennial survey with monthly samplings, as well as to estimate the populational density of the major phytophagous species. This study found 74,407 mites from 26 species belonging to 10 families. The phytophagous and predators represented 95.4% and 3.9% of the total abundance, respectively. Twelve species were rare, six accessories and eight constant. The families Phytoseiidae and Tydeidae had the greatest richness (five and four species, respectively). The most numerous species was Calacarus heveae Feres (50,573), with great abundance at the end of rainy season until the beginning of dry season. Among predators, the most abundant were Zetzellia quasagistemas Hernandes & Feres (1,345), Pronematus sp. (455), Zetzellia agistzellia Hernandes & Feres (409) and Euseius citrifolius Denmark & Muma (243). C. heveae had greatest densities on March and April 2003, and Lorryia formosa Cooreman and Tenuipalpus heveae Baker on March and May 2001, respectively. Many stigmaeids were observed in association with colonies of L. formosa preying their eggs and immatures.

Animals↗

PubMed2002

Quantification of fibronectin adsorption to silicone-rubber cell culture substrates.

As the role of mechanical force in cellular signaling gained recognition, investigators designed a number of devices to deliver controlled regimens of mechanical force to cultured cells. One type of device uses thin silicone-rubber membranes to support monolayer cell adhesion and to transmit mechanical force in the form of biaxial strain. We have observed that cell attachment and spreading are impaired on these membranes compared to polystyrene, even when both are passively coated with identical amounts of extracellular matrix. The purpose of these studies was to quantify the efficiency and stability of passive matrix adsorption onto commercially available elastic culture substrates. A theoretically saturating density (1 microg/cm2) of fibronectin was added to each well, and the initial efficiency of adsorption to the walls and elastic membranes was found to be 31 +/- 2% of the protein added. Strikingly, when the protein adsorbed specifically to the membranes was quantified after seven days, only 10-26 ng/cm2 fibronectin were present, revealing that most of the adsorption is to the sides of the wells. These results indicate that the adsorption of matrix proteins to silicone-rubber substrates is relatively inefficient and that investigators who use these systems must be aware of this fact and design their experiments accordingly.

Adsorption↗

PubMed2003

A discussion of natural rubber latex allergy with special reference to children: clinical considerations.

Latex allergy is an increasingly common condition, because the use of latex products is widespread. Three types of reactions can occur in persons using natural latex rubber products: 1) Irritant contact dermatitis, 2) Allergic contact dermatitis, 3) and Type I hypersensitivity. Children's subpopulations at particular risk include: atopics, individuals with spina bifida, or individuals who required frequent surgical instrumentations. An association between allergy to latex and allergy to various fruits and vegetables has been reported. Recently, an homology between latex allergens and mold allergens has been reported leading to postulate a possible existence of a "latex-mold syndrome". Diagnosis of allergy is based initially on history, skin prick test and search for specific serum IgE. Provocation tests may confirm the suspicion, although these are seldom performed on children because they are not easy to bear with. The most effective strategy to decrease the incidence of NRL (natural rubber latex) sensitization is avoidance; however, this is virtually impossible, given the large number of latex products we encounter since childhood. Studies of secondary prophylaxis among children demonstrate that notwithstanding recommendations, children could manifest yet adverse reactions to latex products and have detectable levels of anti latex IgE.

Child↗

PubMed1997

Fungal colonisation in digital silicone rubber prostheses.

The fungal discolouration of silicone rubber prostheses is reported in four cases. In two of the cases, the discolouration was caused by the fungus Candida tropicalis. In the other two cases, two different fungal organisms, namely Trichoderma sp. and Scedosporium prolificans were incriminated. The non-porous silicone rubber layers create an enclosed environment in the suction cup of the prosthesis and preclude ventilation at the prosthesis-stump interface. The moisture as a result of sweat and body warmth in the stump assists fungal growth. Residual salts from the sweat, sebum from sebaceous glands and the residues from petroleum jelly (Vaseline) applied to facilitate donning, can adhere to the surfaces of the prosthesis and provide the nutrients for fungal growth. Prolonged continuous usages of the prosthesis, the presence of sweaty palms in the users, donning the prosthesis during manual physical activities which induce perspiration, washing of hands with the prosthesis on and warm humid climatic conditions have been identified as factors predisposing the prosthesis to fungal colonisation. The fungal growth caused a black discolouration and marred the aesthetic quality of the prostheses. As a preventative measure, daily immersion of the prostheses in denture cleaner such as benzalkonium chloride, or water at 60 degrees C for 15 minutes, or decontamination with 70% alcohol is recommended. Prior cleaning to remove organic matter before decontamination is emphasised.

Biocompatible Materials↗

PubMed1976

Blood compatibility of silicone rubber chemically coated with cross-linked albumin.

A new method is reported for chemically coating cross-linked albumin onto silicone rubber in an attempt to improve the blood compatibility of the material. Promising results were obtained in an evaluation using both vena cava and renal embolus antithrombogenicity tests ondogs. Coated silicone rubber rings induced much less renal emboli than uncoated ones after one week implantation.

Albumins↗

PubMed1978

In vivo interactions between novel filler free silicone rubber and blood.

To evaluate the thrombogenicity of the novel filler free silicone rubber (FFSR) prepared in our laboratory, its interactions with blood were studied. The test samples (FFSR) along with control Silastic samples were placed in an extracorporeal shunt and primed with sterilized normal saline. The blood from an anaesthetized and systemically heparinized dog was passed over these samples for predetermined time intervals. After washing, fixing, etc., the platelets adhering to the samples were counted under light microscopy. To study the morphological changes of the platelets adhering to the samples, they were examined under scanning electron microscope. The number of platelets adhering to the FFSR samples was very small compared to the Silastic samples. For example, when the blood was passed over the samples for 10 min the number of platelets sticking per 0.14 mm2 surface area was 10 for FFSR samples compared to 380 for Silastic. Furthermore, there were no leukocytes on FFSR samples compared to 10 on Silastic. From these studies, the novel filler free silicone rubber prepared in our laboratory was judged to be more compatible with formed elements of blood compared to the Silastic material.

Animals↗

PubMed1981

Effect of postcuring on hemo-compatibility of silicone rubber.

The widespread acceptance of silicone rubber in a multitude of biomedical devices is a well-known fact. The proper compounding of the rubber to achieve the desired physical properties is of the utmost importance. The catalyst, 2, 4-dichloro benzoyl peroxide, used in the thermal crosslinking of the uncured silicone polymer, plays an important role in the ultimate properties of the polymer. Different post curing steps have been tried and the resultant effects on the hemocompatibility of the polymer is the subject of this work.

Animals↗

PubMed1976

[Silicone rubber-- an unsuitable and dangerous material for T-drains].

Four cases of bile peritonitis after removal of silastic T-tubes are described. The removal of the tubes took place 8 to 23 days after operation. This complication has been described only since the introduction of silastic tubing. The therapy consists in early relaparotomy and drainage. In dogs, the behavior of intraperitoneal silastic and rubber tubes was compared. Whereas rubber tubing was completely surrounded by a fibrous sheet not later than 2 weeks after implantation, the silastic tubing was floating freely in the abdominal cavity even after 6 weeks. Therefore, the use of silastic tubes is dangerous in short-time bile duct drainage. On the other hand, this material had advantages for long-term drainage and for endoluminal prostheses.

Adult↗

PubMed1991

Silicone rubber arthroplasty of the proximal interphalangeal joint: dorsal and lateral approaches.

Although arthrodesis of an arthritic proximal interphalangeal joint provides excellent relief of pain, it does so at the expense of mobility. Silicone rubber implant arthroplasty also provides predictable relief of pain and approximately 60 degrees of motion. Insertion of the implant through a dorsal extensor-splitting approach is preferred when a tendon reconstruction is necessary, as in cases of boutonniére deformity. If tendon reconstruction is not necessary, the lateral approach is an excellent alternative because it does not disturb the extensor mechanism and therefore permits earlier rehabilitation exercises. The following article outlines the dorsal and lateral techniques and postoperative rehabilitation of silicone rubber arthroplasty.

Arthritis↗

PubMed1998

Amended economic impact analysis of final rule requiring use of labeling on natural rubber containing devices--FDA. Final rule; amended economic analysis statement.

The Food and Drug Administration (FDA) is issuing an amended economic analysis statement relating to a final rule that published in the Federal Register of September 30, 1997 (62 FR 51021), requiring labeling statements concerning the presence of natural rubber latex in medical devices. This rule was issued in response to numerous reports of severe allergic reactions and deaths related to a wide range of medical devices containing natural rubber. The final rule becomes effective on September 30, 1998. In order to allow further comment on the economic impact of the September 30, 1997, final rule, FDA published in the Federal Register of June 1, 1998, an amended economic impact statement, including an amended initial regulatory flexibility analysis (IRFA) that it prepared under the Regulatory Flexibility Act (RFA), as amended by the Small Business Regulatory Enforcement and Fairness Act (SBREFA). After considering comments submitted in response to the June 1, 1998, amended economic analysis statement, FDA is issuing the amended final economic impact statement, including an amended final regulatory flexibility analysis.

Costs and Cost Analysis↗

PubMed1998

[The blue rubber bleb nevus syndrome or Bean's syndrome. A rare cause of digestive hemorrhage].

A 71-year-old male who had previously suffered from chronic alcoholism was admitted to the Internal Medicine Service of Coimbra Hospital Center in January 1996 due to asthenia, loss of weight, icterus and abdominal pain, clinical features that had begun six months before admittance to hospital. A physical examination revealed that, in addition to icterus, the patient presented multiple hemangiomas of 1 to 5 cm in diameter, located in the oral cavity, neck, breast and left axilla. These lesions were bluish, elevated and with a rubber-nipple consistency, and had been developing for about 15 years. Subsequent examination revealed normocytic normochromic anemia, cholestatic icterus and the existence of a gastrointestinal hemangioma located in the esophagus. Excisional biopsy of an element proved that it was cavernous hemangioma. A subsequent angio-scintigraphy indicated other aspects suggestive of deep hemangiomas located in the legs, face and cervical region. The authors had the opportunity of examining other members of the patient's family, who apparently did not exhibit similar lesions. They concluded that it was a case of blue rubber bleb nevus syndrome (BRBNS), probably in its sporadic form. Treatment was essentially conservative and the patient is well.

Aged↗

PubMed1999

Brainstem auditory evoked potentials among rubber factory workers.

The study was conducted on 27 rubber factory workers for the functional assessment of brainstem auditory pathway. Neurobehavioural questionnaire was administered to the workers and the personal sampler was used to evaluate the respirable particulate load inhaled per day of each worker along with qualitative analysis for PAH compounds. Evoked potential recording was carried out for brainstem auditory responses. Chest X-rays of workers exhibited varied abnormal features. Multiple regression analysis of data showed definite prolongation of latencies with increasing concentration of respirable particulate load though it was not statistically significant. Comparison with normative data indicated prolongation of latencies of rubber factory workers.

Adult↗

PubMed1976

[Substitution of an injured finger joint by silicone rubber prosthesis].

Between 1973 and the first semester of 1975, on the injured and destroyed digital articulation 27 patients have been operated on by means silicon rubber prosthesis of Swanson type. The prosthesis plasty and the field of its use are shortly resumed, pointing out the importance of its adaptation on the injured articulation. The operative technique is described, as well as the results obtained and the aspects of the evaluation are discussed. The results obtained with the silicon rubber prosthesis are very promising. In the case of failure arthrodesis may be performed at any time.

Finger Injuries↗

PubMed1998

[Detection of 17-ketosteroid and 17-hydroxycorticosteroid in urine after separation and collection by foam rubber].

Using foam rubber 17-ketosteroid (17-KS) and 17-hydroxycorticosteroid (17-OHCS) were separated and collected in urine. 17-KS and 17-OHCS were eluted down from the foam rubber with alcohol, colour reaction can be respectively produced by m-dinitrobenzene and phenyhydrazine hydrocholoride, then both of them were detected by spectro-photometry. The standard deviation of this method was +/- 0.032, and its minimum detectable concentration was 0.01 microgram.ml-1. The recovery rate of 17-KS and 17-OHCS estimation was from 99.0% to 101.0%, with co-efficients of variation less than 6.23%.

17-Hydroxycorticosteroids↗

PubMedDate not supplied

Couriers of asthma: antigenic proteins in natural rubber latex.

Natural rubber latex (NRL) is a milky, white liquid containing the polymer cis-1,4-polyisoprene, derived from the laticifer cells of the rubber tree, Hevea brasiliensis. Reports of allergic reactions to NRL, ranging in severity from skin rashes to anaphylaxis and death, have been increasing. High rates of latex allergy are seen in children with spina bifida. Healthcare workers, especially those who frequently use powdered latex medical gloves, can develop NRL allergy and asthma, often resulting in considerable disability. Atopy and, possibly, pre-existing dermatitis predispose to sensitization and allergic symptoms. NRL protein antigens are found in many NRL products and also have been shown to bind to cornstarch glove-donning powders. Of the approximately 240 polypeptides in NRL, nearly 60 are antigenic, and nine have been identified and registered (Hev b 1&ndash9). Many natural latex antigens share epitopes with structural proteins and enzymes from other plant species. Current knowledge indicates that proposed reductions in total glove protein and limitations on the use of powder on NRL gloves are likely to result in a decline in the prevalence and severity of NRL allergies among healthcare workers.

Antigens↗

PubMed1999

Forgotten rubber drain in the abdomen (case report).

Forgotten rubber drain in the abdomen is a rarely seen situation after the abdominal operations. In this article, a case of "forgotten rubber drain in the abdomen after a liver hydatid cyst operation" was presented. The clinical significance of the case was discussed by surveying all literature.

Abdomen↗