Induction of intestinal ischemia reperfusion injury by portal vein outflow occlusion in rats

Background  

Intestinal ischemia can occur from mesenteric artery (MA) occlusion and portal vein (PV) occlusion. The degree and mechanisms of ischemia/reperfusion (I/R) injury in these conditions may differ. Metabolic changes are seen early in I/R. This study compares tissue histology, inflammation, and metabolic response during small bowel I/R due to superior MA or PV occlusion.     

Controlled release of chlorhexidine antiseptic from microporous amorphous silica applied in open porosity of an implant surface

Amorphous microporous silica (AMS) serving as a reservoir for controlled release of a bioactive agent was applied in the open porosity of a titanium coating on a Ti-6Al-4V metal substrate. The pores of the AMS emptied by calcination were loaded with chlorhexidine diacetate (CHX) via incipient wetness impregnation with CHX solution, followed by solvent evaporation. Using this CHX loaded AMS system on titanium substrate sustained release of CHX into physiological medium was obtained over a 10 day-period. CHX released from the AMS coating was demonstrated to be effective in killing planktonic cultures of the human pathogens Candida albicans and Staphylococcus epidermidis. This surface modification of titanium bodies with AMS controlled release functionality for a bioactive compound potentially can be applied on dental and orthopaedic implants to abate implant-associated microbial infection.     

The effect of Oncotype DX recurrence score on treatment recommendations for patients with estrogen receptor-positive early stage breast cancer and correlation with estimation of recurrence risk by breast cancer specialists

Purpose.

The Oncotype DX assay predicts likelihood of distant recurrence and improves patient selection for adjuvant chemotherapy in estrogen receptor–positive (ER-positive) early stage breast cancer. This study has two primary endpoints: to evaluate the impact of Oncotype DX recurrence scores (RS) on chemotherapy recommendations and to compare the estimated recurrence risk predicted by breast oncology specialists to RS.

Methods.

One hundred fifty-four patients with ER-positive early stage breast cancer and available RS results were selected. Clinicopathologic data were provided to four surgeons, four medical oncologists, and four pathologists. Participants were asked to estimate recurrence risk category and offer their chemotherapy recommendations initially without and later with knowledge of RS results. The three most important clinicopathologic features guiding their recommendations were requested.

Results.

Ninety-five (61.7%), 45 (29.2%), and 14 (9.1%) tumors were low, intermediate, and high risk by RS, respectively. RS significantly correlated with tumor grade, mitotic activity, lymphovascular invasion, hormone receptor, and HER2/neu status. Estimated recurrence risk by participants agreed with RS in 54.2% ± 2.3% of cases. Without and with knowledge of RS, 82.3% ± 1.3% and 69.0% ± 6.9% of patients may be overtreated, respectively (p = 0.0322). Inclusion of RS data resulted in a 24.9% change in treatment recommendations. There was no significant difference in recommendations between groups of participants.

Conclusions.

Breast oncology specialists tended to overestimate the risk of tumor recurrence compared with RS. RS provides useful information that improves patient selection for chemotherapy and changes treatment recommendations in approximately 25% of cases.     

Tumornecrosis-Factor-α 308 GA Polymorphism in Atherosclerotic Patients

The development of the atherosclerosis is a multifactorial process, where the clinical pattern is determined by environmental and genetic factors. Except for the classical risk factors of atherosclerosis (hypertension, lipid-metabolic disorders, diabetes, smoking) the clinical signs can be influenced by the genetic variants (polymorphisms) of the enzymes, which are responsible for the endothelial cell function and for the thrombotic factors. In our examination our aim was to define the TNF-α 308GA polymorphisms in atherosclerotic diabetic, atherosclerotic non-diabetic and healthy patients. We found correlation of the frequency of myocardial infarction and stroke in atherosclerotic diabetic and atherosclerotic non-diabetic patients. We proved that among patients with mutant TNF-α AA genotype the occurrence of cardiovascular events is significantly higher: Mutant AA homozygous genotype: control group 1, 6%, MI group 10,7%, p < 0,005, OR: 8,17 versus Normal GG allele: control group 76,7%, MI group 61,3%. The TNF-α AA genotype can have a clinical importance as a prognostic and therapeutic marker, although further studies are needed to confirm this hypothesis.     

The Role of Viral Infections in the Development of Dilated Cardiomyopathy

Enteroviruses (EVs) are the most frequent pathogens in myocarditis and in the subsequently developing dilated cardiomyopathy as well. Furthermore, persistence of other viruses might play a pathogenic role in the evolution from myocarditis to dilated cardiomyopathy. Explanted heart of 28 patients, who underwent heart transplantation were screened for EV, AdV3 and HHV6 sequences in order to assess the incidence of cardiac viral infection that may be implicated in the pathogenesis of cardiomyopathy, and estimate viral distribution in the myocardium. Viral sequences were extracted from five different regions of the hearts. Nested PCR was used to amplify conservative regions of AdV3, HHV6 and EVs. Histological examination was performed on routinely processed myocardial samples. AdV3 was verified in one fourth of the patients. ADV3 and HHV6 sequences coexisted in one case with inflammatory cardiomyopathy. Some patients had more than one positive area of their heart. AdV3 positive right ventricular samples were double in amount compared to the left ones. None of the patients had positive result for EV. This is the first occasion to identify AdV3 (a mainly respiratory infective virus) sequence in explanted hearts of cardiomyopathy patients. Though the clinical importance of our results is still unclear, AdV3 could be a new member of the viral group with possible pathogenic effect on the myocardium. Regional distribution of viral sequence location confirmed that the right ventricular wall as a biopsy sampling site might be adequate for endomyocardial biopsy pro diagnostic purposes.     

Effect of weight loss after weight loss surgery on plasma N-terminal pro-B-type natriuretic peptide levels

Natriuretic peptides have multiple beneficial cardiovascular effects. Previous cross-sectional studies have indicated that obese subjects have lower natriuretic peptide concentrations than those of normal weight. It is not known whether this relative natriuretic peptide deficiency is reversible with weight loss. We studied 132 obese subjects undergoing weight loss surgery with serial measurement of plasma N-terminal pro-B-type natriuretic peptide (NT-proBNP) concentrations at preoperative, early (1 to 2 months), and late postoperative (6 months) points. In addition, 20 subjects also underwent echocardiography at baseline and 6 months after surgery. Significant weight loss was observed after surgery (median body mass index 45.1, 41.0, and 32.9 kg/m(2) for the 3 corresponding points, analysis of variance p <0.001). The median NT-proBNP levels increased substantially (31.6, 66.9, and 84.9 pg/ml; p <0.001). The average intrasubject increase in NT-proBNP at the 2 postoperative points was 3.4 and 5.0 times the preoperative level (p <0.001 for both points vs preoperatively). In the multivariate regression models adjusted for clinical characteristics and insulin resistance, the strongest predictor of the change in NT-proBNP level 6 months after weight loss surgery was the change in weight (p = 0.03). Echocardiography showed a mean intrasubject reduction in left ventricular mass index of 18% (p <0.001) and mild improvements in diastolic function, with no change in ejection fraction. In conclusion, we have demonstrated that weight loss is associated with early and sustained increases in NT-proBNP concentrations, despite evidence of preserved systolic and improved diastolic function. These findings suggest a direct, reversible relation between obesity and reduced natriuretic peptide levels.     

Cardiac failure in the newborn. Diagnostic pitfalls

Echocardiography commonly represents the diagnostic clue in neonatal heart failure (HF). Congenital heart diseases are the most frequent causes of HF in this age group. Arterio-venous malformations are the most common noncardiac causes of HF. Normal cardiac structural findings on echocardiography require further investigations in order to exclude other causes of HF. We present three male patients admitted in the interval 2003-2007 with neonatal HF, systolic murmur, cardiomegaly, normal cardiac structure on echocardiography and intracranial bruit. All three cases were diagnosed with vein of Galen aneurysmal malformation (VGAM) by head ultrasound. According to age and malformation type, different presentation patterns were noticed: early neonatal intractable HF mimicking aortic coarctation, postnatal HF stabilized by drug treatment, and chronic HF in a VGAM with tendency to spontaneous regression. Both head ultrasound and cranial auscultation are mandatory in newborns or infants with no cardiac primary cause of HF.     

Experiences and opinions of multi-professional non-medical oncology prescribers on post-qualification training: a qualitative study

Background: Within the UK, a non-medical prescriber is a non-medical healthcare professional who has undertaken post-registration training to gain prescribing rights. Lack of post-qualification NMP training has previously been identified as a barrier to the development of oncology non-medical prescribing practice. Aim: To explore the experiences and opinions of multi-professional non-medical oncology prescribers on post-qualification training. Method: Nine out of 30 oncology non-medical prescribers (three nurses, three pharmacists and three radiographers) from a single cancer centre in Wales, were selected from a study site NMP database using randomisation sampling within Microsoft® Excel. Participants were interviewed using a validated and piloted semi-structured interview design on the topic of post-qualification training for non-medical prescribers. Participants were invited via organisational email. Interviews were audio-recorded and transcribed verbatim. Anonymised data were thematically analysed aided by NVivo® software. Results: Main themes identified: experience related to training, competency, support and training methods. Competency assessment methods discussed were the annual non-medical prescriber appraisal, peer review and a line manager’s overarching appraisal. Support requirements identified included greater consultant input to help non-medical prescribers identify training and peer support opportunities. Organisational support was requested regarding regular study leave and governance around clinical judgement and errors. The need for regular structured in-house training related to non-medical prescriber’s level of experience was identified. Conclusion: Development of organisation-led governance strategies and in-house training programmes will support training equity for all non-medical prescribers within the organisation.

     

Spleen autotransplantation. Morphological and functional follow-up after spleen autotransplantation in mice: a research summary

In 1986, we started the research on spleen surgery aimed at saving the splenic mass after its traumatic injury, with elaboration of special resection and autotransplantation techniques. The researches started on mongrel dogs and were continued on inbred mice and beagle dogs with complex histological, imaging, and laboratory investigations, following-up the function and the regeneration of autotransplanted spleen chips. Performing research on mice provided more immunological methods, such as lymphocyte subsets, immunoglobulin levels, and monitoring the phagocytic functions. Researches showed evidence also on the presence of apoptosis, furthermore, stem cell studies on regeneration and functional restoration of the spleen chips are in progress. Our results contributed to two multidisciplinary guidelines in Hungary: (1) One of them is under preparation and underlines the importance of spleen saving methods after traumatic splenic injury; (2) The second guideline shows that hemorheological changes can be early indicators of the increased sensitivity to postsplenectomy infections.