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Dunn D, Orlowski M, McCoy P, Gastgeb F, Appell K, Ozgur L, Webb M, Burbaum J. Ultra-high throughput screen of two-million-member combinatorial compound collection in a miniaturized, 1536-well assay format. JOURNAL OF BIOMOLECULAR SCREENING 2000; 5:177-88. [PMID: 10894761 DOI: 10.1177/108705710000500310] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Results of a complete survey of the more than 2-million-member Pharmacopeia compound collection in a 1536-well microvolume screening assay format are reported. A complete technology platform, enabling the performance of ultra-high throughput screening in a miniaturized 1536-well assay format, has been assembled and utilized. The platform consists of tools for performing microvolume assays, including assay plates, liquid handlers, optical imagers, and data management software. A fluorogenic screening assay for inhibition of a protease enzyme target was designed and developed using this platform. The assay was used to perform a survey screen of the Pharmacopeia compound collection for active inhibitors of the target enzyme. The results from the survey demonstrate the successful implementation of the ultra-high throughout platform for routine screening purposes. Performance of the assay in the miniaturized format is equivalent to that of a standard 96-well assay, showing the same dependence on kinetic parameters and ability to measure enzyme inhibition. The survey screen identified an active class of compounds within the Pharmacopeia compound collection. These results were confirmed using a standard 96-well assay.
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Abstract
A series of potent P'-extended alpha-ketoamide inhibitors of chymotrypsin-like activity of proteasome is described.
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178
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Thupvong T, Wiideman A, Dunn D, Oreschak K, Jankowicz B, Doering J, Castignetti D. Sequence heterogeneity of the ferripyoverdine uptake (fpvA), but not the ferric uptake regulator (fur), genes among strains of the fluorescent pseudomonads Pseudomonas aeruginosa, Pseudomonas aureofaciens, Pseudomonas fluorescens and Pseudomonas putida. Biometals 1999; 12:265-74. [PMID: 10581691 DOI: 10.1023/a:1009270302536] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Pseudomonas aeruginosa, Pseudomonas aureofaciens, Pseudomonas fluorescens and Pseudomonas putida are of importance to medicine, agriculture and biocycling. These microbes acquire ferric ion via the use of the siderophores pyochelin and the family known as the pyoverdines or pseudobactins. The ferric uptake regulator (fur) gene is responsible, at least in part, for the regulation of siderophore synthesis and uptake in P. aeruginosa. To determine whether the organisms contain single or multiple homologues of the siderophore-related genes fpvA (ferripyoverdine uptake) and fur, and whether these homologues displayed sequence heterogeneity, their chromosomal DNAs were probed with fur and fpvA sequences. As a representative of a non-fluorescent pseudomonad, the bacterium Burkholderia (Pseudomonas) cepacia was also examined. The pseudomonads all contained fpvA- and fur-like homologues, and heterogeneity was observed among the different species. The presence of two or more fpvA-like genes is indicated in all of the fluorescent pseudomonads surveyed. In contrast, B. cepacia DNA either did not hybridize to these probes, or did so only very weakly, suggesting that fur- and fpvA-like homologues are either absent or significantly different in B. cepacia compared to the fluorescent pseudomonads examined.
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Chatterjee S, Dunn D, Tao M, Wells G, Gu ZQ, Bihovsky R, Ator MA, Siman R, Mallamo JP. P2-achiral, P'-extended alpha-ketoamide inhibitors of calpain I. Bioorg Med Chem Lett 1999; 9:2371-4. [PMID: 10476871 DOI: 10.1016/s0960-894x(99)00392-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
A series of potent P2-achiral, P'-extended alpha-ketoamide inhibitors of calpain I is described.
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Wallon M, Dunn D, Slimani D, Girault V, Gay-Andrieu F, Peyron F. Diagnosis of congenital toxoplasmosis at birth: what is the value of testing for IgM and IgA? Eur J Pediatr 1999; 158:645-9. [PMID: 10445343 DOI: 10.1007/s004310051168] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
UNLABELLED Recommendations vary on the best combination of tests to use for the diagnosis of subclinical congenital toxoplasmosis at birth. The diagnostic accuracy of IgM and IgA tests was assessed in the context of routine clinical practice on 233 newborns with congenital toxoplasmosis and 661 healthy controls. IgM/IgA sensibility and specificity were compared in cord and postnatal samples. Both tests were considerably more specific in neonatal blood (IgM: 98%; IgA: 100%) than in cordblood (IgM: 85%; IgA: 88%). Sensitivity for IgM and IgA was not significantly different in neonatal blood (61% and 60%, respectively) and cord blood (67% and 54%, respectively). Combining IgM and IgA increased the overall sensitivity to 73% without any significant loss in specificity (98%). The influence of the date of maternal infection on the sensitivity and negative predictive value was also clearly demonstrated. CONCLUSION Because of their relatively low cost compared to more sophisticated methods, IgM and IgA tests should remain the main method for the routine diagnosis of congenital toxoplasmosis although follow up is essential to identify the Ca. 25% of infected children who are missed at birth on the basis of these tests.
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182
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Loveday C, Dunn D, McCormack S, Babiker A. The use of HIV resistance assays--random or randomised? Sex Transm Infect 1999; 75:140-1. [PMID: 10448385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023] Open
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183
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Dunn D, Wallon M, Peyron F, Petersen E, Peckham C, Gilbert R. Mother-to-child transmission of toxoplasmosis: risk estimates for clinical counselling. Lancet 1999; 353:1829-33. [PMID: 10359407 DOI: 10.1016/s0140-6736(98)08220-8] [Citation(s) in RCA: 360] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Women who acquire toxoplasmosis infection during pregnancy (in most cases detected through serological screening) require counselling about the risk of congenital infection and its clinical sequelae. Reliable estimates of risk are not currently available. We undertook an analysis of data from women referred to the toxoplasmosis reference laboratory, Lyon, France, between 1987 and 1995. METHODS Information was collected from clinical notes kept at the laboratory and, where necessary, from the relevant obstetrician or paediatrician via telephone. Methods were developed to derive estimates of the risk of congenital toxoplasmosis by exact duration of gestation at maternal seroconversion. FINDINGS We analysed obstetric and paediatric data on 603 confirmed maternal toxoplasmosis infections. At least 564 women received antiparasitic drugs according to a standard protocol. Congenital infection status was ascertained in 554 cases, and infected children were followed-up for a median of 54 months. The overall maternal-fetal transmission rate was 29% (95% CI 25-33), which masked a sharp increase in risk with duration of gestation from 6% at 13 weeks to 72% at 36 weeks. However, fetuses infected in early pregnancy were much more likely to show clinical signs of infection. These effects counterbalance, and women who seroconverted at 24-30 weeks of gestation carried the highest risk (10%) of having a congenitally infected child with early clinical signs who was thus at risk of long-term complications. INTERPRETATION This information will assist the clinical counselling of pregnant women diagnosed with acute toxoplasmosis and may guide individual decisions on investigative and therapeutic options. Further studies are required to determine the long-term risks of clinical symptoms and disability due to congenital toxoplasmosis.
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184
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Canawati H, El-Farra R, Seymour J, Shimashita J, Dunn D, Montgomerie J. Ciprofloxacin-Resistant Escherichia Coli Emerging in a Rehabilitation Medical Center. J Urol 1999. [DOI: 10.1016/s0022-5347(01)62189-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Sloand EM, Maciejewski JP, Dunn D, Moss J, Brewer B, Kirby M, Young NS. Correction of the PNH defect by GPI-anchored protein transfer. Blood 1998; 92:4439-45. [PMID: 9834251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
Hemolytic anemia is a major feature of paroxysmal nocturnal hemoglobinuria (PNH). Intravascular red blood cell (RBC) destruction is caused by increased sensitivity of the abnormal erythrocyte to complement-mediated lysis, due to the GPI absence of a membrane-bound glycosylphosphatidylinositol (GPI)-linked protein, which functions as an inhibitor of reactive lysis (CD59). Both in vivo and in vitro models have suggested the feasibility of cell-to-cell transfer of GPI proteins, and patients with hemolysis could potentially benefit from transfer of CD59 to their deficient erythrocytes. We studied the ability of RBC components prepared from outdated packed RBC collections, as well as high-density lipoprotein (HDL) preparations, rich in CD55 and CD59, to promote protein transfer, as assessed by flow cytometry, immunoblotting, and susceptibility to complement-mediated lysis. By flow cytometry, CD55 and CD59 were present on RBC-derived microvesicles that stained with an antiglycophorin antibody Ab; in addition, soluble CD59 and CD55 were detected by immunoblot in soluble fractions eluated from RBC units stored for more than 35 days, but not in fresh blood. Both commercial HDL preparations and those prepared in our laboratory contained CD55 and CD59, as assayed by immunoblot. When RBC that were deficient (GPI)-anchored protein, obtained from five patients, with PNH were incubated with HDL preparations for 2 to 4 hours, there was significant transfer of both proteins to the cell surface, as demonstrated by flow cytometry. Washed RBC microvesicles, prepared by ultrasonification, also mediated transfer of GPI-linked proteins to deficient RBC. Pretreatment of microvesicles, RBC eluate preparations, and HDL with phosphatidylinositol-specific, phospholipase C, abrogated protein transfer to deficient cells, indicating that increased cell-associated CD55 and CD59 levels were related to insertion of the intact GPI moiety, rather than to simple adhesion. PNH RBC that were exposed to HDL, RBC eluate preparations, or microvesicles demonstrated decreased in vitro complement-mediated hemolysis in the Ham test. Transfer of GPI-linked proteins from soluble preparations containing CD55 and CD59 to PNH erythrocytes is feasible and may have clinical utility.
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187
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Tripathy R, Gu ZQ, Dunn D, Senadhi SE, Ator MA, Chatterjee S. P2-proline-derived inhibitors of calpain I. Bioorg Med Chem Lett 1998; 8:2647-52. [PMID: 9873596 DOI: 10.1016/s0960-894x(98)00470-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The syntheses and biological activities of a series of calpain I inhibitors, derived from D- and L-Pro, are described.
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188
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Abstract
Today's trend is to have the surgical patient return to the comfort of his or her home rather than be admitted to the hospital for expensive nursing and medical care. The perioperative team must initially assess the patient's American Society of Anesthesiology status, anxiety level, food and drugs to which he or she may be allergic, and skin integrity; obtain a medical and surgical history and consent; review laboratory, electrocardiogram, and radiological results; and perform preoperative teaching (e.g., which medications to take or withhold preoperatively, when to withhold food and fluids) and postoperative teaching (e.g., catheter care, dressing changes). In addition, the nurse needs to anticipate and be prepared for medical emergencies such as airway management problems and malignant hyperthermia. The age of the patient (e.g., pediatric and geriatric age groups) and preoperative disease states and their severity also need to be recognized as they impact on the perioperative outcome. The assessment phase is one of the most important phases in the perioperative experience. Proper evaluation is the key to success for positive surgical outcomes. Given the time constraints in the ambulatory surgical setting, assessing and teaching the patient on the day of surgery is not feasible or appropriate. Reaching out to the patient a few days before surgery either in the patient's home, in the ambulatory surgery center, or by telephone is the ultimate goal.
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Wang J, Otsuki T, Youssoufian H, Foe JL, Kim S, Devetten M, Yu J, Li Y, Dunn D, Liu JM. Overexpression of the fanconi anemia group C gene (FAC) protects hematopoietic progenitors from death induced by Fas-mediated apoptosis. Cancer Res 1998; 58:3538-41. [PMID: 9721856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Fanconi anemia is a rare, inherited disorder characterized by bone marrow failure, congenital malformations, and cancer susceptibility. The group C Fanconi anemia gene, FAC, identified by expression cloning methods, encodes a protein of unknown function that may be involved in the response to apoptotic stimuli. Hematopoietic progenitor cells from Fac knock-out mice are hypersensitive to IFN-gamma, a molecule that can induce apoptosis through up-regulation of the Fas death receptor. In this study, we used FAC-overexpressing transgenic mice to examine the relationship between FAC and Fas-triggered cell death. Hematopoietic progenitors from FAC-transgenic mice were up to 10-fold less sensitive to the cytolytic effect of Fas-ligation. Our experiments implicate FAC in the regulation of apoptosis mediated by the Fas death receptor.
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Chatterjee S, Gu ZQ, Dunn D, Tao M, Josef K, Tripathy R, Bihovsky R, Senadhi SE, O'Kane TM, McKenna BA, Mallya S, Ator MA, Bozyczko-Coyne D, Siman R, Mallamo JP. D-amino acid containing, high-affinity inhibitors of recombinant human calpain I. J Med Chem 1998; 41:2663-6. [PMID: 9667954 DOI: 10.1021/jm980035y] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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191
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Austin J, Dunn D, Huster G, Rose D. Development of scales to measure psychosocial care needs of children with seizures and their parents. 1. J Neurosci Nurs 1998; 30:155-60. [PMID: 9689606 DOI: 10.1097/01376517-199806000-00002] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
There is little research and no self-report assessment instruments available to guide nurses in the provision of psychosocial care to children with seizures and their families. Information on the development of two instruments, Report of Psychosocial Care Scale and Child Report of Psycyhosocial Care Scale, and their use in a research study to measure psychosocial care of children with new-onset seizures and their parents are presented in three parts. This first article describes development and initial testing of their psychometric properties. The second article, Part 2, "Psychosocial Care Needs of Parents of Children with New-Onset Seizures," describes results from the use of the parent scale with mothers and fathers of children with new-onset seizures. The third article, Part 3, "Psychosocial Care Needs of Children with New-Onset Seizures," reports findings from the use of the child scale with children ages 8-14 years with new-onset seizures.
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McNelis A, Musick B, Austin J, Dunn D, Creasy K. Psychosocial care needs of children with new-onset seizures. 2. J Neurosci Nurs 1998; 30:161-5. [PMID: 9689607 DOI: 10.1097/01376517-199806000-00003] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The Child Report of Psychosocial Care Scale was used to measure children's satisfaction with health care received, need for information and support and seizure-related concerns and fears in children with new-onset seizures. The sample of 63 children (33 girls and 30 boys), 8-14 years, completed the scale two times, 3 months and 6 months after their first seizure. Results indicated that children need the most nursing care in two areas: information related to the seizure condition, especially managing their condition, and support, in the form of talking to other children with seizures. The scale provides direction for tailored nursing interventions that will meet the specific needs of children with seizures for information and support.
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Shore C, Austin J, Musick B, Dunn D, McBride A, Creasy K. Psychosocial care needs of parents of children with new-onset seizures. 3. J Neurosci Nurs 1998; 30:169-74. [PMID: 9689608 DOI: 10.1097/01376517-199806000-00004] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
The Parent Report of Psychosocial Care was developed to address the concerns, needs for care and satisfaction with care received of parents of children with new-onset seizures. Parents were interviewed three months and six months after their child's first seizures using the instrument. Mothers especially identified continued needs for information and support and were worried about unlikely events such as brain tumors and death. The results from this study indicate that parents' needs for information and support need to be assessed at every encounter with the health care system during the first 6 months after the child's first seizure.
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Abstract
Application of Wipf's protocol to generate alpha-keto-2-oxazolines is described.
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195
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Hull R, Demarest J, Dunn D, Stach EA, Yuan Q. Applications of Ion Microscopy and In Situ Electron Microscopy to the Study of Electronic Materials and Devices. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 1998; 4:308-316. [PMID: 9767668 DOI: 10.1017/s143192769898031x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
: We discuss the application of ion microscopy and in situ electron microscopy to the study of electronic and optical materials and devices. We demonstrate how the combination of in situ transmission electron microscopy and focused ion beam microscopy provides new avenues for the study for such structures, enabling extension of these techniques to the study of dopant distributions, nanoscale stresses, three-dimensional structural and chemical reconstruction, and real-time evolution of defect microstructure. We also discuss in situ applications of thermal, mechanical, electrical, and optical stresses during transmission electron microscopy imaging.
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196
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Hoshino T, Jiang YZ, Dunn D, Paul D, Qazilbash M, Cowan K, Wang J, Barrett J, Liu J. Transfection of interleukin-12 cDNAs into tumor cells induces cytotoxic immune responses against native tumor: implications for tumor vaccination. Cancer Gene Ther 1998; 5:150-7. [PMID: 9622098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Interleukin-12 (IL-12) is a heterodimeric cytokine that is central to the development of T helper 1-dependent cellular immunity. Although this cytokine has potential therapeutic application as an antineoplastic agent, the systemic infusion of IL-12 has led to toxic fatalities; hence, restriction of expression of IL-12 to the microenvironment of target tumor cells has obvious appeal. In this study, we examined whether tumor cells that were liposome-transfected with IL-12 could enhance the induction of cytolytic lymphocyte immunity to the native tumor. The plasmid expression vector that we used has several useful features including replication to high copy number as an episome and a polycistronic message enabling the production of both the p35 and p40 subunits of IL-12 without alternative splicing; up to 3 ng/mL/10(6)/48 hours of IL-12 was produced following transfection. Tumor cells transfected with IL-12 were superior to untransfected cells in the induction of lymphocyte-mediated cytolysis. IL-12 transfectants induced a heterogeneous population of natural killer, lymphokine activated killer, and cytolytic T lymphocytes, the latter of which exhibited tumor-specific activity. Our studies suggest that liposome-mediated transfection of tumor cells with an episomal, high copy number plasmid vector expressing both IL-12 subunits is a promising approach to cancer vaccination, a strategy that could be implemented ex vivo in treating malignancies such as metastatic ovarian cancer.
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197
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Bedford H, Booy R, Dunn D, DiGuiseppi C, Gibb D, Gilbert R, Logan S, Peckham C, Roberts I, Tookey P. Autism, inflammatory bowel disease, and MMR vaccine. Lancet 1998; 351:907; author reply 908-9. [PMID: 9525395 DOI: 10.1016/s0140-6736(05)70320-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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198
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Abstract
The preoperative holding area is an important, but often over-looked, area in the surgical suite. This area, however, is where the majority of surgical patients and their family members have their first direct contact with perioperative staff members. The preoperative holding area can provide the environment for calming, informative interactions that should help patients prepare for their surgical procedures. The preoperative holding area nurse's primary responsibility is to provide information and emotional support for patients and their family members, to ensure that all preoperative data have been accumulated, and to maintain patients' baseline hemodynamic statuses.
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Canawati HN, el-Farra R, Seymour J, Shimashita J, Dunn D, Montgomerie JZ. Ciprofloxacin-resistant Escherichia coli emerging in a rehabilitation medical center. Diagn Microbiol Infect Dis 1997; 29:133-8. [PMID: 9401805 DOI: 10.1016/s0732-8893(97)81802-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A retrospective review of laboratory records from 1988 to 1996 has shown an increased rate of ciprofloxacin-resistant (cip(r)) Escherichia coli in our rehabilitation center. Resistance increased from 0.6% in 1989 to 5.9% in 1996. Of 7870 E. coli strains isolated during this period, 257 cip(r)-E. coli were recovered from 257 patients. The majority (96%) of these resistant strains were isolated from the urine samples. One hundred and twenty strains of cip(r)-E. coli were also resistant to four other fluoroquinolones. MICs ranging from 64 to 512 micrograms/mL were observed in 75% of the strains and > or = 1028 micrograms/mL in 6.4% of the strains. Resistance to ciprofloxacin was due to possible mutations in topoisomerase gyrA.
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Casanova D, Sanjuán MV, Gruessner RW, Dunn D, Sutherland DE. [Infections in kidney and pancreas transplantation]. Enferm Infecc Microbiol Clin 1997; 15 Suppl 2:104-11. [PMID: 9312294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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