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Biomedical subjects

A Celik

Publications and source records attributed to A Celik.

66 records · Page 4Linked to original sources
PubMed1992

The effect of surgical trauma on the bacterial translocation from the gut.

Bacterial translocation is the passage of viable bacteria from the lumen of the gastrointestinal tract through the intestinal mucosa to other sites. It is believed that bacterial translocation may lead to infection and septicemia. The purpose of this study was to determine what factors in experimental surgical trauma lead to bacterial translocation. Two-month-old Wistar albino rats were divided into five groups: (A) control; (B) anesthesia (ether inhalation); (C) anesthesia and surgery (median laparotomy and transient compression of the intestines); (D) fasting only; and (E) anesthesia, surgery, and fasting. After 48 hours, ileum, mesenteric lymph nodes, and blood were cultured for aerobic and anaerobic organisms. In each group the number of animals with bacteria overgrowth was calculated. The incidence of bacterial translocation to mesenteric lymph nodes and blood in groups B and D were similar to the controls (P greater than .01). There was a significant increase in the number of animals with bacterial translocation in groups C and E (P less than .001). The majority of translocating bacteria were E coli.

Animals↗
PubMed1978

[Perforating wounds of the abdomen (author's transl)].

From 1972 to 1976 160 cases of perforating wounds of the abdomen were treated: 115 stab wounds, 45 gunshot wounds. Mortality rate in stab wounds came up to 4,34% and in gunshot wounds to 20%. Total mortality of all cases 8,75%.

Abdominal Injuries↗
PubMedDate not supplied

Intravascular contrast agent improves magnetic resonance angiography of carotid arteries in minipigs.

This study was designed to optimize three-dimensional (3D) time-of-flight (TOF) magnetic resonance angiography (MRA) sequences and to determine whether contrast-enhanced MRA could improve the accuracy of lumen definition in stenosed carotid arteries of minipigs. 3D TOF MRA was acquired with use of either an intravascular (n = 13) and/or an extravascular contrast agent (n = 5) administrated at 2 to 4 weeks after balloon-induced injury to a carotid artery in 16 minipigs. Vascular contrast, defined as signal intensity differences between blood vessels and muscle normalized to the signal intensity of muscle, was compared before and after the injection of each contrast agent and between the two agents. Different vascular patencies were observed among the animals, including completely occluded vessels (n = 5), stenotic vessels (n = 3), and vessels with no visible stenosis (n = 8). Superior vascular contrast improvement was observed for small arteries and veins and for large veins with the intravascular contrast agent when compared with the extravascular contrast agent. In addition, preliminary studies in two of the animals showed a good correlation for the extent of luminal stenosis defined by digital subtraction angiography compared with MRA obtained after administration of the intravascular contrast agent (R2 = .71, with a slope of .96 +/- .04 by a linear regression analysis). We concluded that use of an intravascular contrast agent optimizes 3D TOF MRA and may improve its accuracy compared with digital subtraction angiography.

Animals↗
PubMedDate not supplied

Quantitative measurements of cerebral metabolic rate of oxygen utilization using MRI: a volunteer study.

Quantitative estimates of cerebral metabolic rate of oxygen utilization using magnetic resonance imaging can have profound implications for the understanding of brain metabolic activity as well as the investigation of cerebrovascular disease. In this study, five normal volunteers were studied. All images were acquired on a Siemens 1.5 T scanner (Siemens Medical Systems Inc, Erlangen, Germany). Cerebral blood flow (CBF) was obtained in vivo with a dynamic imaging approach and the acquired images were post-processed with the singular value decomposition method (SVD). In addition, a multi-echo gradient echo/spin echo sequence was employed to provide MR estimates of oxygen extraction fraction (MR_OEF) in vivo. Subsequently, an absolute measure of MR cerebral metabolic rate of oxygen utilization (MR_CMRO(2)) was obtained in all subjects by taking the product of CBF and MR_OEF. A mean MR_CMRO(2) of 28.94 +/- 3.26 ml/min/100 g and 12.57 +/- 3.11 ml/min/100 g was obtained for gray matter and white matter, respectively, suggesting that the gray matter utilizes more oxygen than white matter under normal physiological conditions. These results yield a gray matter to white matter CMRO(2) ratio of 2.37 +/- 0.37, which is comparable to the reported values in the literature. More studies are needed to further improve on the accuracy as well as shortening the required data acquisition time so that the proposed approaches can be utilized in a routine clinical setting.

Brain↗
PubMedDate not supplied

Tubular CD44 expression in renal allograft biopsies.

CD44 is a type I transmembrane glycoprotein serving as a cell adhesion receptor, whose main ligand is hyaluronic acid, but also may interact with collagen, laminin, fibronectin, and osteopontin. This marker is involved in cell migration, homing, activation, metastasis, and inflammation. Tubular CD44 expression has been shown to correlate with scarring in renal diseases, but there is little data on allograft biopsies. This deficiency is important since experimental studies have shown that blockade of the CD44-hyaluronic acid interaction may prolong allograft survival. In an attempt to clarify the role of tubular CD44 expression in renal allografts, CD44 expression was determined immunohistochemically in 37 allograft and 10 implantation biopsies, as the percentage of tubules expressing this marker. For implantation biopsies the mean tubular CD44 expression was 6% +/- 14%; for allograft biopsies, 13% +/- 20% (P =.17, Mann-Whitney U). By the Spearman correlation test, CD44 expression did not correlate with Banff scores, but was moderately correlated with serum creatinine values at the time of biopsy (P =.017, r =.4). These findings suggest an important role of tubular CD44 expression in renal allografts. It appears to be induced by more than one pathway, resulting in a pattern of expression that correlated with renal function. However larger series are required before recommending the routine use of this marker.

Adult↗
PubMedDate not supplied

CARD15 polymorphisms in Behçet's disease.

BACKGROUND: Behçet's disease (BD) is a chronic multi-system inflammatory disorder of unknown aetiology, which shares many features of the inflammatory bowel diseases (IBDs). CARD15 has recently been identified as the first susceptibility gene in Crohn's disease (CD). OBJECTIVE: Given certain clinical and pathological similarities between CD and BD, and recent evidence of linkage of BD to the CARD15 genomic region, the aim of this study was to investigate the role of CARD15 variants in determining susceptibility to BD. METHODS: We studied 374 BD patients from three ethnically homogeneous cohorts (white English, Turkish, and Middle Eastern Arabs of Palestinian and Jordanian descent). Mutation detection of CARD15 was performed by direct sequencing in a subset of patients from each group and the identified variants were genotyped in the complete cohorts. Case-control analyses were carried out with additional stratification by the BD-associated allele, HLA-B*51. RESULTS: Mutation detection identified six previously described CARD15 polymorphisms at a frequency of > 3%. Additionally, two of the three CD-associated polymorphisms were present, but at low frequency. The frequency of haplotypes, constructed from nine genotyped polymorphisms, demonstrated significant variation between different ethnic groups. However, case-control analyses demonstrated no association between the CARD15 polymorphisms and susceptibility to BD, irrespective of HLA-B*51 status. CONCLUSION: CARD15 variant alleles are not associated with susceptibility to BD. Other shared loci, currently under investigation, may determine susceptibility to both CD and BD.

Arabs↗
PubMedDate not supplied

Asymptomatic bacteriuria in infants in eastern Turkey.

In this study, the prevalence of asymptomatic bacteriuria (ABU) was investigated in the 146 infants without symptoms suggesting urinary tract infection, age ranged from 29 days to 15 months (mean 4.56 +/- 3.30 months). Our purpose was to determine the prevalence ofABU in infants living in Eastern Turkey and to define the relationship between pyuria and ABU in infants. Of 146 infants, 77 (52.7%) were males, and 69 (47.3%) were females. Although we would like to select randomized healthy infants for the study, 47 (32.1%) infants had a mild to severe malnutrition. While various microorganisms were cultured in 41 (28%) infants in the first urinary culture, only 18 (12.3%) infants had a positive culture in the second urinary culture. The prevalence of ABU was 12.3%. Although ABU prevalence was higher in the infants with malnutrition than those without malnutrition (14.8% 1 vs. 11.1%), there was not a difference between the groups (p>0.05). There was a positive relation between urinary culture positiveness and pyuria (p < 0.001). The prevalence of ABU was much higher (12.3%) than the literature data, which was probably related to very low socioeconomic status of our region where malnutrition and its related disorders are commonly seen. The high ratio might also be related to the method of urine collection, because we used sterile collecting bag, but not suprapubic aspiration method.

Bacteriuria↗
PubMedDate not supplied

Anti-Saccharomyces cerevisiae antibodies (ASCA) in Behçet's syndrome.

OBJECTIVES: Anti-Saccharomyces cerevisiae antibodies (ASCA) are found in 50-60% of patients with Crohn's disease. Increased as well as normal levels have been reported in Behçet's syndrome (BS). We reassessed the level of IgG and IgA ASCA antibodies in BS and in a group of diseased and healthy controls. METHODS: Eighty-five patients with BS were studied along with 20 patients with ankylosing spondylitis (AS), 24 with Crohn's disease (CD), 25 with ulcerative colitis (UC) and 21 healthy volunteers. A commercial ELISA kit was used (Inova Diagnostics). RESULTS: It was only the patients with CD who had significantly higher levels of antibodies compared with the rest of the group (ANOVA: ASCA IgG, p = 0.0001; ASCA IgA, p = 0.0001). 42% of CD, 4% of BS, 4% of UC and 15% of AS patients had a positive IgG+IgA ASCA. There was a significant trend for patients with gastrointestinal (GI) involvement with BS (n = 8) to be more positive for IgG and IgG+IgA ASCA compared to the rest of the patients with BS (n = 77) (Chi-square, IgG, p = 0.02, IgG+IgA, p = 0.001). CONCLUSION: The rate of positivity of ASCA in BS is comparable to that observed among patients with UC and AS. Patients with BS who have GI involvement may have higher levels of ASCA and this needs to be further studied.

Adult↗
PubMedDate not supplied

Pericardial mesothelioma. A pediatric case report.

A nine and a half year old boy was brought to the hospital because of a cough, dyspnea and mild fever. He was well-nourished and had an uneventful history. His chest X-ray and electrocardiographic findings suggested pericarditis but further examinations and an open pericardial biopsy revealed a mass histologically diagnosed as pericardial mesothelioma, a very rare tumor in this age group.

Child↗
PubMedDate not supplied

Cardiac extension of Wilms' tumor.

Two children who were brought to the Istanbul Children's Hospital with congestive heart failure caused by extension of Wilms' tumor to the right atrium are presented. In both cases a large mass was noted in the right atrium by two-dimensional echocardiography. The tumors were successfully removed at open heart surgery, and chemotherapy and radiotherapy were started postoperatively. The patients are both alive and symptom-free; one, three and a half years and the other two years postoperatively.

Child↗