88 research outputs found
Hypogammaglobulinemia and Poor Performance Status are Predisposing Factors for Vancomycin-Resistant Enterococcus Colonization in Patients with Hematological Malignancies
No full textObjective: Vancomycin-resistant enterococci (VRE) are common pathogens of hospital-acquired infection. Long hospitalization periods, use of broadspectrum antibiotics, and immunosuppression are major risks for VRE colonization. We aimed to evaluate patients' characteristics and factors that may contribute to VRE colonization. Materials and Methods: Data of 66 patients with colonization and 112 patients without colonization who were hospitalized in the hematology clinic were collected. Hematological malignancies, preexisting gastrointestinal complaints, the presence of hypogammaglobulinemia at the time of diagnosis, complications like neutropenic enterocolitis (NEC), and Eastern Cooperative Oncology Group (ECOG) and Karnofsky performance statuses were recorded. Results: Ages of the patients ranged between 19 and 95 years (mean: 55.99). Karnofsky and ECOG scores were statistically related to VRE colonization (p7 days) may also be accepted as a risk factor, independent of diagnosis or antibiotic use. Performance status is also an important factor for colonization, which may be related to poorer hygiene and increased external help
Evaluation of Risk Factors in Enterococcal Bloodstream Infections
No full textObjective: The aim of this retrospective case-control study was to determine the epidemiology and to evaluate risk factors for the development of enterococcal bloodstream infections and risk factors involved in mortality of adult patients in a tertiary care teaching hospital between February 2010 and February 2011. Methods: A total of 95 enterococcal bacteremia episodes were identified among 28 593 patients hospitalized during the study period. Control group was selected among patients who had no signs and symptoms of bacteremia and had negative blood cultures during the study period. In each case, there had to be two randomized control cases. Results: The most frequent isolates were Enterococcus faecalis (n=46, 48.4%) and E. faecium (n=45, 47.4%). There was only one vancomycin-resistant E. faecalis (vanA genotype) and one E. gallinarum. Eighty four (88.4%) patients were identified to have nosocomial infection. The most common primary sites were central venous catheter (32.7%) and urinary tract (14.7%). Six cases of infective endocarditis and two cases of meningitis due to enterococci were also identified. Polymicrobial bacteremia occurred in 39 (41%) patients. Immunosuppression, cardiovascular disease, chronic liver parenchymal disease, gastrointestinal tract disease, chronic renal failure, hemodialysis, an open wound, Foley catheter, surgery other than abdominal operation, antacid use, hospitalization in the last one month, prolonged hospitalization (> 15 days), exposure to antimicrobial therapy prior to bacteremia and inappropriate empirical therapy were the risk factors significantly associated with enterococcal bloodstream infections. In the multivariate logistic regression analysis, three factors were independently associated with mortality including high Charlson index (p=0.000), intensive care unit admission (p=0.016) and isolation of E. faecium from blood cultures (p=0.49). Conclusions: It should be considered that severely ill patients with prolonged hospitalization, those undergoing invasive procedures or receiving inappropriate antibiotic therapy have a high risk of enterococcal bacteremia and those with serious underlying comorbidities are likely to be unresponsive to treatment and have a higher mortality
Trakya bölgesinde hastalardan izole edilen Brucella kökenlerinin in vitro antibiyotik duyarlılığı
No full textAmaç: Bu çalışmada, Brucella kökenlerinde tür tayini yapılması ve in vitro olarak doksisiklin, rifampisin, streptomisin, seftriakson, siprofloksasin ve ofloksasinine karşı antimikrobiyal duyarlılık oranlarının belirlenmesini amaçladık. Yöntem: Trakya Üniversitesi Tıp Fakültesi Hastanesi, Klinik Mikrobiyoloji Laboratuvarında, yatan hastalardan alınan klinik örneklerde (bir adet BOS ve 41 adet kan kültürü örneğinde) 42 Brucella suşu izole edildi. Konvansiyonel yöntemler ile 42 Brucella suşunun, 41’i Brucella. melitensis, bir tanesi ise Brucella abortus olarak tanımlandı. Agar dilüsyon yöntemi ile farklı iki pH’da (pH: 5, pH: 7) 48 ve 72 saatlik inkübasyon süreleri sonunda antibiyotiklerin etkinliği karşılaştırıldı. Minimum inhibitör konsantrasyonu (MİK) değerleri, intraselüler patojenlerin antibiyotik duyarlılık testi için hazırlanmış ‘Eucast Discussion Document E.Dis 6.1’de önerildiği şekilde değerlendirildi. Bulgular: pH: 7’de 48 ve 72 saatlik inkübasyonlar sonrası elde edilen sonuçlar karşılaştırıldığında, sadece ofloksasinin MİK50 ve MİK90 değerlerinin iki katına yükseldiği görüldü. pH: 5’te 72 saatlik inkübasyon süresi sonunda rifampisinin etkinliği artarken, doksisiklin etkinliğinin değişmediği gözlenirken, Streptomisin, seftriakson, siprofloksasin ve ofloksasinin ise etkinliklerinin azaldığı gözlenmiştir. Sonuç: Bu çalışmada pH: 7’de ve 48 saatlik inkübasyon süresi sonunda MİK90 değerlerine göre antibakteriyel ilaçlar Brucella kökenleri üzerine etkili olarak saptandı. Doksisiklin, pH: 5 ve pH: 7’de, 48 ve 72 saatlik inkübasyon süreleri sonunda MİK90 değerlerine göre en etkili antibakteriyel ilaç olarak saptandı. Brucella cinsinde yer alan bakteriler fakültatif hücre içi mikroorganizmalardır ve hücre içi benzeri pH: 5 olan ortamda streptomisin, seftriakson, siprofloksasin ve ofloksasinin etkinlikleri azalmaktadır. Bruselloz tedavisinde bu durum göz önünde bulundurulmalıdır
Etiologic agents and risk factors in nosocomial urinary tract infections
No full textNosocomial urinary tract infection (NUSI) is one of the most common hospital acquired infections. In this study, we aimed to determine the risk factors, frequency and the bacterial etiology of NUSI in hospitalized patients at Trace University Hospital, Turkey. Between September 1(st) 2004 to March 1(st) 2005, 104 NUSI episodes from 91 adult patients (mean age; 60.8 +/- 16.1 years; 46 were female) were determined among 8704 patients admitted to the hospital. During the study period, cumulative incidence of NUSI was 1.04% and episode rate of NUSI was 1.19%. The most important risk factors for NUSI were detected as urinary catheterization (78.8%), antimicrobial therapy within the previous 15 days (60.6%), fecal incontinence (33.7%) and surgical operations [29.8% (42% of them were urological pertainings)]. In 37.8% of the episodes urinary catheterization was considered as performed unnecessarily. In 26% of the episodes another infection (pneumoniae, abdominal infection, wound infection) accompanied. The causative microorganisms were resistant to the antibiotics used for therapy in 93.6% of the episodes. A total of 118 microorganisms (14 were polymicrobial) have been isolated from the urine cultures. The most frequently isolated ones were Escherichia coli (n: 48; 40.8%), Candida spp. (n: 27; 23%), Enterococcus spp. (n: 13; 11%), Pseudomonas aeruginosa (n: 9; 7.6%), Klebsiella pneumoniae (n: 8; 6.8%) and Acinetobacter spp. (n: 5; 4.2%). The highest susceptibility rates of E.coli isolates were against imipenem and nitrofurantoin (100%) and amikacin (97.7%), the lowest susceptibility rates were against ampicillin (26.7%) and amoxycillin-clavulonate (44.4%). No glycopeptid resistance was detected for Enterococcus spp. while the susceptibility rates to penicilin and nitrofurantoin were 38.5% and 63.6%, respectively. Since the number of the other bacterial, species was low (<10) their antimicrobial resistance rates were not evaluated. Extended-spectrum beta-lactamase (ESBL) production was determined in 27% of E.coli and in 25% of K.pneumoniae isolates, and cases with ESBL producing strains had significiantly higher antibiotic consumption rate in the previous 15 days (p=0.004). Blood cultures which were collected during NUSI episodes yielded positive results in 31.8%. The mortality rate due to NUSI was significantly higher in cases with bloodstream infection (p=0.000). In conclusion, the high rates of NUSI associated with bloodstream infections and mortality detected have pointed out serious problems in our hospital, and indicated that more attention should be paid on urinary catheterisation, rational antibiotic usage and control of nosocomial infections
An inexact successive quadratic approximation method for L-1 regularized optimization
No full textWe study a Newton-like method for the minimization of an objective function that is the sum of a smooth function and an regularization term. This method, which is sometimes referred to in the literature as a proximal Newton method, computes a step by minimizing a piecewise quadratic model of the objective function . In order to make this approach efficient in practice, it is imperative to perform this inner minimization inexactly. In this paper, we give inexactness conditions that guarantee global convergence and that can be used to control the local rate of convergence of the iteration. Our inexactness conditions are based on a semi-smooth function that represents a (continuous) measure of the optimality conditions of the problem, and that embodies the soft-thresholding iteration. We give careful consideration to the algorithm employed for the inner minimization, and report numerical results on two test sets originating in machine learning.National Science Foundation [DMS-1216554, DMS-0810213]; Department of Energy [DE-SC0001774]; ONR [N00014-14-1-0313 P00002]; US Department of Energy [DE-FG02-87ER25047]; Scientific and Technological Research Council of Turkey [113M500]; U.S. Department of Energy (DOE) [DE-FG02-87ER25047, DE-SC0001774] Funding Source: U.S. Department of Energy (DOE)Richard H. Byrd was supported by National Science Foundation Grant DMS-1216554 and Department of Energy Grant DE-SC0001774.; Jorge Nocedal was supported by National Science Foundation Grant DMS-0810213, and by ONR Grant N00014-14-1-0313 P00002.; Figen Oztoprak was supported by US Department of Energy Grant DE-FG02-87ER25047 and by Scientific and Technological Research Council of Turkey Grant Number 113M500. Part of this work was completed while the author was at Istanbul Technical University
Candida glabrata : Etiologic agent of soft tissue abscess in a diabetic patient
No full text[Abstract Not Available
On codes written by matrices lexicographically ordered
No full text6th International Eurasian Conference on Mathematical Sciences and Applications (IECMSA) -- AUG 15-17, 2017 -- Budapest, HUNGARYCertain matrices lexicographically ordered are written using the elements of F-2[u]/(). The relations between the codes generate by these matrices and Hadamard codes are given
About quasi-cyclic codes over finite fields
No full text6th International Eurasian Conference on Mathematical Sciences and Applications (IECMSA) -- AUG 15-17, 2017 -- Budapest, HUNGARYIn this paper, quasi-cyclic codes over the field F-p are studied and they are classified according to their lengths for each prime p
Acute liver ınjury in a patient with secondary syphilis and acute viral hepatitis B coinfection
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