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Accuracy of T2 magnetic resonance assays as point-of-care methods in the intensive care unit. J Hosp Infect 2023; 139:240-248. [PMID: 37392869 DOI: 10.1016/j.jhin.2023.06.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 05/29/2023] [Accepted: 06/07/2023] [Indexed: 07/03/2023]
Abstract
BACKGROUND Novel molecular diagnostic methods are being evaluated in order to expedite pathogen identification in patients with bacteraemia. AIMS To evaluate the feasibility and diagnostic accuracy of the T2 magnetic resonance (T2MR) assays - T2 Bacteria (T2B) and T2 Resistance (T2R) - as point-of-care tests in the intensive care unit compared with blood-culture-based tests. METHODS Prospective cross-sectional study of consecutive patients with suspected bacteraemia. Diagnostic accuracy was evaluated using blood culture as the reference method. FINDINGS In total, 208 cases were included in the study. The mean time from sampling to report was lower for the T2MR assays compared with blood-culture-based methods (P<0.001). The rate of invalid reports was 6.73% for the T2B assay and 9.9% for the T2R assay. For the T2B assay, overall positive percentage agreement (PPA) was 84.6% [95% confidence interval (CI) 71.9-93.1%], negative percentage agreement (NPA) was 64.3% (95% CI 55.4-72.6%), positive predictive value (PPV) was 48.9% (95% CI 42.5-55.3%) and negative predictive value (NPV) was 91.2% (95% CI 84.4-95.2%). Cohen's kappa coefficient was 0.402. For the T2R assay, overall PPA was 80% (95% CI 51.9-95.7%), NPA was 69.2% (95% CI 54.9-81.3%), PPV was 42.9% (95% CI 31.7-54.8%) and NPV was 92.3% (95% CI 81.1-97.1%). Cohen's kappa coefficient was 0.376. CONCLUSION T2MR assays have high NPV for rapid exclusion of bacteraemia, and could potentially assist with antimicrobial stewardship when applied as point-of-care diagnostic tests in the intensive care unit.
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Differential diagnosis of bacterial from candidal bloodstream infections in ICU patients: the role of procalcitonin. Crit Care 2015. [PMCID: PMC4472761 DOI: 10.1186/cc14148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Antibiotic synergy testing for multidrug-resistant Gram-negative pathogens in a Greek ICU. Crit Care 2015. [PMCID: PMC4470823 DOI: 10.1186/cc14177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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AKI - Clinical. Nephrol Dial Transplant 2012. [DOI: 10.1093/ndt/gfs235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Evaluation of microcirculation before and during continuous renal replacement therapy and the impact of dose prescription. Crit Care 2012. [PMCID: PMC3363790 DOI: 10.1186/cc10979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Abstract
AIM To evaluate the radiographic technical quality of root fillings and the incidence of iatrogenic errors in treatment provided by undergraduate students. METHODOLOGY Endodontic records and periapical radiographs of 759 root filled teeth were selected following exclusion of 25 (3.3%). A final total of 734 cases were used to assess the technical quality of root fillings in 1109 root canals performed by 4(th) and 5(th) undergraduate students. Two variables were examined: the length and the density of the fillings, categorized as acceptable and non-acceptable. The presence of ledges, root perforation, foramen perforation and fractured instruments were also investigated. Chi-square tests were used for statistical analysis. RESULTS Acceptable root fillings were found in 55% of canals. More ;acceptable' root fillings occurred in maxillary compared to mandibular teeth (58 and 51% respectively) (P < 0.05) and in anterior compared with premolar (71 and 61%) and molar root canals (39% respectively) (P < 0.05). Insignificantly more (5.4%) acceptable root fillings were provided by 5(th) year students. Most of the underfillings and iatrogenic errors were detected in molars for both academic years (53 and 65% respectively). Ledges were noted in 55% of cases treated by both academic years and significantly more foramen perforations were detected in the 5(th) compared with the 4(th) year students (P < 0.05). CONCLUSIONS There is a need to improve the technical quality of root fillings performed by the undergraduate students, especially in molar teeth.
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Non-Linear Vibration Technique for Crack Detection in Beam Structures Using Frequency Mixing. ACTA ACUST UNITED AC 2010. [DOI: 10.3813/aaa.918357] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Serum of patients with septic shock stimulates the expression of Trem-1 on U937 monocytes. Inflamm Res 2009; 58:127-32. [PMID: 19109693 DOI: 10.1007/s00011-008-7039-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
OBJECTIVES To describe the concentrations of sTREM-1 in patients with sepsis and to explore the effects of their serum on the expression of TREM-1 on U937 monocytes. METHODS Blood was sampled at regular time intervals in 56 patients with sepsis. Concentrations of tumour necrosis factor-alpha (TNFalpha), interleukin-1beta (IL-1alpha), IL-6, IL-8, IL-10 and IL-12p70 and sTREM-1 were measured. U937 monocytes were incubated in the presence of serum at sepsis onset. RESULTS Median sTREM-1 concentration on day 1 for patients with septic shock was 915 pg/ml and 228.5 pg/ml for those without shock (p = 0.002). TNFalpha, IL-1alpha, IL-6, IL-8 and IL-10 did not differ between them. A positive correlation was found between changes of sTREM-1 and SOFA scores from day 1 to 7. Sera of patients with septic shock evoked a significant increase of the expression of TREM-1. The concentrations of TNFalpha and IL-8 in supernatants increased only after stimulating with sera of patients without shock, but not after stimulating with sera of patients with shock. CONCLUSIONS Levels of sTREM-1 correlated with sepsis severity. sTREM-1 is considerably higher in patients with shock compared to patients without shock. The serum of shocked patients could stimulate the expression of TREM-1 on U937 monocytes.
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Daptomycin therapy for Gram-positive bacterial infections: a retrospective study of 30 cardiac surgery patients. Crit Care 2008. [PMCID: PMC4088401 DOI: 10.1186/cc6251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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P1344 Multidrug-resistant Acinetobacter baumannii susceptible only to colistin outbreak in a cardiac surgical intensive care unit. Int J Antimicrob Agents 2007. [DOI: 10.1016/s0924-8579(07)71184-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Candida colonization and risk of candidemia in a cardiac surgical intensive care unit. Crit Care 2007. [PMCID: PMC4095166 DOI: 10.1186/cc5272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
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Multidrug-resistant Acinetobacter baumannii susceptible only to colistin outbreak in a cardiac surgical intensive care unit. Crit Care 2007. [PMCID: PMC4095153 DOI: 10.1186/cc5259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Dimopoulou I, Mavrou I, Douka E, Lyberopoulos P, Kopterides P, Orfanos S, Tzanela M, Lignos M, Theodorakopoulou M, Augustatou C, Kostopanagiotou G, Macheras A, Vasdekis S, Thalassinos N, Tsagarakis S, Armaganidis A. Crit Care 2006; 10:P263. [DOI: 10.1186/cc4610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Dimopoulou I, Zervou M, Douka E, Augustatou C, Alevizopoulou P, Stamoulis K, Theodorakopoulou M, Mavrou I, Lignos M, Kopterides P, Papadomichelakis E, Tzoufi M, Orfanos S, Tzanela M, Armaganidis A, Tsagarakis S, Roussos C. Crit Care 2006; 10:P260. [DOI: 10.1186/cc4607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Dimopoulou I, Douka E, Mavrou I, Kopterides P, Lignos M, Lyberopoulos P, Augustatou C, Tzanella M, Orfanos S, Macheras A, Kostopanagiotou G, Trivizas P, Potoula E, Thalassinos N, Tsagarakis S, Armaganidis A. Crit Care 2005; 9:P403. [DOI: 10.1186/cc3466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Dimopoulou I, Stamoulis K, Lyberopoulos P, Douka E, Alevizopoulou P, Armaganidis A, Thalassinos N, Tsagarakis S. Crit Care 2005; 9:P401. [DOI: 10.1186/cc3464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Dimopoulou I, Tsagarakis S, Zervou M, Douka E, Orfanos S, Kotanidou A, Livaditi O, Augustatou C, Tzanella M, Thalassinos N, Armaganidis A, Roussos C. Crit Care 2005; 9:P397. [DOI: 10.1186/cc3460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Structural diversity of the triterpenic hydrocarbons from the bacterium Zymomonas mobilis: the signature of defective squalene cyclization by the squalene/hopene cyclase. FEMS Microbiol Lett 2001; 199:247-51. [PMID: 11377875 DOI: 10.1111/j.1574-6968.2001.tb10682.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Twelve polycyclic triterpenic hydrocarbons (alpha- and gamma-polypodatetraenes, dammara-20(21),24-diene, 17-isodammara-12,24-diene, eupha-7,24-diene, hop-17(21)-ene, neohop-13(18)-ene, 17-isodammara-20(21),24-diene, neohop-12-ene, fern-8-ene, diploptene and hop-21-ene) were detected in the hydrocarbon fraction from the bacterium Zymomonas mobilis. Some of them have never been reported from bacteria. These triterpenes were present in Z. mobilis in significant amounts, comparable to those of diploptene, which is usually the major triterpenic hydrocarbon in hopanoid-producing bacteria. The occurrence of such compounds confirms the lack of specificity of bacterial squalene cyclases and the possibility of alternative cyclization routes induced by the existence in the cyclization process of intermediate carbocations of sufficient lifetime.
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Use of a green fluorescent protein gene as a reporter in Zymomonas mobilis and Halomonas elongata. FEMS Microbiol Lett 2001; 201:221-7. [PMID: 11470365 DOI: 10.1111/j.1574-6968.2001.tb10760.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
We investigated the applicability of the green fluorescent protein of Aequorea victoria as a reporter for gene expression in the strictly fermentative Gram-negative ethanologenic bacterium Zymomonas mobilis and in the moderately halophilic bacterium Halomonas elongata. We have succeeded to express a mutated gene of green fluorescent protein under the control of different promoters in Z. mobilis and H. elongata grown under various glucose or salt concentrations, respectively. Our results demonstrate that gfp can serve as an easily assayable reporter gene in both organisms. Maximum fluorescence was obtained in Z. mobilis grown aerobically and in H. elongata grown under elevated salt concentration in solid medium. For both bacteria the fluorescence obtained was higher when the gfp gene was placed under the control of a native promoter.
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Treatment of refractory or early relapsed lymphoma with MINE regimen. Eur J Cancer 1999. [DOI: 10.1016/s0959-8049(99)81779-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
Exponentially growing cells of Zymomonas mobilis normally exhibit a lag period of up to 3 h when transferred from 0.11 M (2%) to 0.55 M (10%) glucose liquid medium. A mutant of Z. mobilis (CU1Rif2), fortuitously isolated, showed more than a 20-h lag period when grown under the same conditions, whereas on 0.55 M glucose solid medium, it failed to grow. The growth of CU1Rif2 on elevated concentrations of other fermentable (0.55 M sucrose or fructose) or nonfermentable (0.11 M glucose plus 0.44 M maltose or xylose) sugars appeared to be normal. Surprisingly, CU1Rif2 cells grew without any delay on 0.55 M glucose on which wild-type cells had been incubated for 3 h and removed at the beginning of their exponential phase. This apparent preconditioning was not observed with medium obtained from wild-type cells grown on 0.11 M glucose and supplemented to 0.55 M after removal of the wild-type cells. Undelayed growth of CU1Rif2 on 0.55 M glucose previously conditioned by the wild type was impaired by heating or protease treatment. It is suggested that in Z. mobilis, a diffusible proteinaceous heat-labile factor, transitionally not present in 0.55 M glucose CU1Rif2 cultures, triggers growth on 0.55 M glucose. Biochemical analysis of glucose uptake and glycolytic enzymes implied that glucose assimilation was not directly involved in the phenomenon. By use of a wild-type Z. mobilis genomic library, a 4.5-kb DNA fragment which complemented in low copy number the glucose-defective phenotype as well as glucokinase and glucose uptake of CU1Rif2 was isolated. This fragment carries a gene cluster consisting of four putative coding regions, encoding 167, 167, 145, and 220 amino acids with typical Z. mobilis codon usage, -35 and -10 promoter elements, and individual Shine-Dalgarno consensus sites. However, strong homologies were not detected in a BLAST2 (EMBL-Heidelberg) computer search with known protein sequences.
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