Coherence controlled holographic microscopy - a tool for detection of new biomarkers of head and neck squamous cell carcinoma.

BACKGROUND: Squamous cell carcinoma of the head and neck is characterized by local invasiveness and metastases to regional lymph nodes. In 60% of cases, these tumours are dia-gnosed at an advanced stage, and the prognosis is unfavorable. One of the important factors of local, hematogenous or lymphogenic spread of the tumour in the human body is tumour cells migration ability. Advanced microscopic methods provide a new perspective on cell migration. PURPOSE: This paper presents a coherence controlled holographic microscopy method that provides a non-invasive quantitative evaluation of morphological and dynamic properties of living tumour cells. In connection with this method, new potential bio-markers are emerging, the significance of which, however, needs to be verified by correlation with clinical data.

B cells from Patients with Rheumatoid Arthritis Show Conserved CD39-Mediated Regulatory Function and increased CD39 Expression After Positive Response to Therapy.

Rheumatoid arthritis (RA) is a chronic inflammatory disease characterized by progressive joint destruction associated with increased pro-inflammatory mediators. In inflammatory microenvironments, exogenous ATP (eATP) is hydrolyzed to adenosine, which exerts immunosuppressive effects, by the consecutive action of the ectonucleotidases CD39 and CD73. Mature B cells constitutively express both ectonucleotidases, converting these cells to potential suppressors. Here, we assessed CD39 and CD73 expression on B cells from treated or untreated patients with RA. Neither the frequency of CD73+CD39+ and CD73-CD39+ B cell subsets nor the levels of CD73 and CD39 expression on B cells from untreated or treated RA patients showed significant changes in comparison to healthy controls (HC). CpG+IL-2-stimulated B cells from HC or untreated RA patients increased their CD39 expression, and suppressed CD4+ and CD8+ T cell proliferation and intracellular TNF-production. A CD39 inhibitor significantly restored proliferation and TNF-producing capacity in CD4+ T cells, but not in CD8+ T cells, from HC and untreated RA patients, indicating that B cells from untreated RA patients conserved CD39-mediated regulatory function. Good responder patients to therapy (R-RA) exhibited an increased CD39 but not CD73 expression on B cells after treatment, while most of the non-responder (NR) patients showed a reduction in ectoenzyme expression. The positive changes of CD39 expression on B cells exhibited a negative correlation with disease activity and rheumatoid factor levels. Our results suggest modulating the ectoenzymes/ADO pathway as a potential therapy target for improving the course of RA.

How common are vascular injuries in open tibial fractures? A prospective longitudinal cohort study.

BACKGROUND: Tibial fractures have an incidence of 15% of all adult fractures. They have been shown to have the highest incidence of non-union in long bone fractures and the highest incidence of vascular injury. Evidence from the literature suggests that a good vascular supply is important to ensure bone union. The aim of our study was to prospectively assess the incidence of vascular injuries in open tibial fractures and determine whether they were associated with an increased risk of non-union. METHODS: We performed a prospective study to investigate the incidence of arterial injuries with computed tomography angiography (CTA) in patients with Gustilo-Anderson grade I-III open tibial fractures between 2013 and 2015. CTA was performed with the trauma series at acute admission and reported by two independent musculoskeletal radiologists. Patients were followed up with clinical and radiographic assessment for 1 year. RESULTS: We recruited 77 patients into the study, and 56 patients (47 males, 9 females) were available for the final analysis, between 16 and 90 years of age. At the initial assessment, 29% had signs of arterial injury with active extravasation in 5%. The most common site of injury was in the diaphysis (87.5%), and the commonest mechanism was a road traffic accident. We found no significant relation between occult vascular injury and non-union (p > 0.05). CONCLUSION: The incidence of vascular injury in open tibial fractures is 29%, and CTA is therefore a useful test in identifying vascular injuries that may require vascular intervention.

Reconstructing the microstructure of polyimide-silicalite mixed-matrix membranes and their particle connectivity using FIB-SEM tomography.

Properties of a composite material made of a continuous matrix and particles often depend on microscopic details, such as contacts between particles. Focusing on processing raw focused-ion beam scanning electron microscope (FIB-SEM) tomography data, we reconstructed three mixed-matrix membrane samples made of 6FDA-ODA polyimide and silicalite-1 particles. In the first step of image processing, backscattered electron (BSE) and secondary electron (SE) signals were mixed in a ratio that was expected to obtain a segmented 3D image with a realistic volume fraction of silicalite-1. Second, after spatial alignment of the stacked FIB-SEM data, the 3D image was smoothed using adaptive median and anisotropic nonlinear diffusion filters. Third, the image was segmented using the power watershed method coupled with a seeding algorithm based on geodesic reconstruction from the markers. If the resulting volume fraction did not match the target value quantified by chemical analysis of the sample, the BSE and SE signals were mixed in another ratio and the procedure was repeated until the target volume fraction was achieved. Otherwise, the segmented 3D image (replica) was accepted and its microstructure was thoroughly characterized with special attention paid to connectivity of the silicalite phase. In terms of the phase connectivity, Monte Carlo simulations based on the pure-phase permeability values enabled us to calculate the effective permeability tensor, the main diagonal elements of which were compared with the experimental permeability. In line with the hypothesis proposed in our recent paper (Capek, P. et al. (2014) Comput. Mater. Sci. 89, 142-156), the results confirmed that the existence of particle clusters was a key microstructural feature determining effective permeability.

Model for photodegradation of polybrominated diphenyl ethers.

Polybrominated diphenyl ethers (PBDE) were, and in some countries still are, used as flame retardants for plastic materials. When released from plastics, PDBE cause harm to the environment. This creates the incentive for further investigation of the PBDE degradation. This work focused on a formulation of a PBDE photodegradation model based on the PBDE properties obtained by the quantum chemical calculations. The proposed model predicted degradation routes of arbitrary PBDE congener. The routes of selected congeners were validated by the two independently published data sets and showed the high fitting degree. The model can be easily modified for any reactor system if the initial reaction rate constant of one congener is available for the given system.

The impact of trauma centre designation on open tibial fracture management.

INTRODUCTION: The British Orthopaedic Association/British Association of Plastic, Reconstructive and Aesthetic Surgeons guidelines for the management of open tibial fractures recommend early senior combined orthopaedic and plastic surgical input with appropriate facilities to manage a high caseload. The aim of this study was to assess whether becoming a major trauma centre has affected the management of patients with open tibial fractures. METHODS: Data were obtained prospectively on consecutive open tibial fractures during two eight-month periods: before and after becoming a trauma centre. RESULTS: Overall, 29 open tibial fractures were admitted after designation as a major trauma centre compared with 15 previously. Of the 29 patients, 21 came directly or as transfers from another accident and emergency deparment (previously 8 of 15). The time to transfer patients admitted initially to local orthopaedic departments has fallen from 205.7 hours to 37.4 hours (p=0.084). Tertiary transferred patients had a longer hospital stay (16.3 vs 14.9 days) and had more operations (3.7 vs 2.6, p=0.08) than direct admissions. As a trauma centre, there were improvements in time to definitive skeletal stabilisation (4.7 vs 2.2 days, p=0.06), skin coverage (8.3 vs 3.7 days, p=0.06), average number of operations (4.2 vs 2.3, p=0.002) and average length of hospital admission (26.6 vs 15.3 days, p=0.05). CONCLUSIONS: The volume and management of open tibial fractures, independent of fracture grade, has been directly affected by the introduction of a trauma centre enabling early combined senior orthopaedic and plastic surgical input. Our data strongly support the benefits of trauma centres and the continuing development of trauma networks in the management of open tibial fractures.

[Repeated resection for recurrent pulmonary metastases]. / Opakované plicní resekce v chirurgii plicních metastáz.

INTRODUCTION: Repeated pulmonary resections are predominantly used in sarcomas, colorectal cancer, Grawitz tumours, and at a young age in general. Patients with the recurrence of pulmonary metastases within a period of six months have a poor prognosis. MATERIAL AND METHODS: During the period from I/1997 to XII/2011, a total of 165 operations were performed in 149 patients. 11patients had multiple pulmonary resections. According to histological origin, sarcomas were found in 6 cases, Grawitz tumours in 2 cases, Schwannoma malignum in 1 case and laryngeal carcinoma in 1 case. There was synovialosarcoma, osteosarcoma, rhabdomyosarcoma, alveolar sarcoma and uterine sarcoma in the group of sarcomas. RESULTS: In our retrospective study, the most commonly used approach was muscle-sparing vertical thoracotomy in 14 patients, posterolateral thoracotomy in 8 patients, VATS in 3 patients and clamshell thoracotomy in 3 patients. We performed 22 extraanatomic resections - of which 3 times VATS, 6 times lobectomy (of which 1 completion pneumonectomy). We observed complications in 6 cases (small air leak in 3 patients, wound infection in 3 patients) in the postoperative period. No rethoracotomy for complications was needed, lethality was 0. The overall 5-year survival that we observed was 45.4%. CONCLUSION: Surgery is an integral part of complex oncological care. What is extremely important is strict selection of patients eligible for surgery for repeated resections and, of course, an experienced team of thoracic surgeons, but also other physicians. When performed by experienced specialists, surgical treatment of lung metastases is a safe and very useful procedure.

[Wound microbial sampling methods in surgical practice, imprint techniques]. / Metody odberu vzorku na kultivacní vysetrení v chirurgické praxi, otiskové metody.

The wound is a damage of tissue. The process of healing is influenced by many systemic and local factors. The most crucial and the most discussed local factor of wound healing is infection. Surgical site infection in the wound is caused by micro-organisms. This information is known for many years, however the conditions leading to an infection occurrence have not been sufficiently described yet. Correct sampling technique, correct storage, transportation, evaluation, and valid interpretation of these data are very important in clinical practice. There are many methods for microbiological sampling, but the best one has not been yet identified and validated. We aim to discuss the problem with the focus on the imprint technique.

Echinococcus granulosus glycoconjugates induce peritoneal B cell differentiation into antibody-secreting cells and cytokine production.

Helminth parasite infections are associated with predominant Th2-type cytokine responses, and parasite glycoconjugates have been recognized as partially responsible for such immune bias. It has been proved that Echinococcus granulosus evokes a Th2-type cytokine pattern characterized by a high production of IL-4, IL-5, IL-6 and IL-10, and no or mild IFN-γ levels in animal models and in patients with cystic echinococcosis, respectively. Here, we show that E4(+) (a glycoconjugate-enriched fraction from E. granulosus protoscolex) stimulated the secretion of a high concentration of IL-6, followed by IL-10 and TNF-α by normal peritoneal B cells. We determined that E4(+) bound to the surface of peritoneal B cells and induced their activation and, also, triggered the differentiation of peritoneal B cells into IgM-, IgG2b- and IgG3-secreting cells in a T-independent way. Interestingly, the IgM released by E4(+) -stimulated peritoneal B cells from normal mice recognized protoscolex antigens. Results showed that, after the encounter with antigens from E. granulosus protoscolex, peritoneal B cells are a source of Th2-type cytokines and polyclonal antibodies, some of which recognize parasite antigens, suggesting that peritoneal B cells can condition the outcome of the infection.

[Is pneumonectomy justified in the management of lung metastases?]. / Je oprávnené provedení pneumonektomie v lécbe plicních metastáz?

The authors discuss about questions of possibility pneumonectomy in concept of lung metastasis therapy. They analysed in detail indications, surgery, complications, survival and factors of survival. The authors also introduce case report of one patient with pneumonectomy in your group of patients.

[Spontaneous pneumomediastinum--a case review]. / Spontánní pneumomediastinum--kazuistika.

The authors present in the following case review a patient with spontaneous pneumomediastinum which can be on of the causes of acute chest pain and it is necessary to think about it in the differential diagnosis of this condition.

A systematic review of free tissue transfer in the management of non-traumatic lower extremity wounds in patients with diabetes.

OBJECTIVES: Wounds of the lower limb in patients with diabetes are frequently difficult to heal. Some wounds fail to heal despite optimal medical and surgical care. This review examines the evidence for whether free tissue transfer techniques may reduce the requirement of amputation in these patients. DESIGN: A systematic review. MATERIALS & METHODS: Pubmed, Embase, AMED, SCOPUS and CINAHL and Cochrane Library were searched for all articles on free tissue transfer in lower limb wounds in patients with diabetes (September 2010). Current experience, indications and outcomes were analysed. RESULTS: 528 patients from 18 studies were included in the systematic review. 66% of patients had concomitant revascularisation with bypass surgery. 63% of flaps were muscle based, 35% fasciocutaneous and 1.7% omental. Pooled in-hospital mortality rate was 4.4%, flap survival was 92% and limb salvage rate of 83.4% over a 28 months average follow-up time. CONCLUSIONS: In conclusion free tissue transfer achieves successful wound healing in selected patients with diabetes and difficult to heal wounds that would have required amputation. Pre-operative optimisation of vascular supply and eradication of infection is key to success. Objective wound assessment scores and a clear multidisciplinary team (MDT) approach would improve patient care.

Long-term outcome of squamous cell carcinoma of the upper and lower limbs.

Cutaneous squamous cell carcinoma (SCC) is the second most common malignant skin tumour in the European population, with an annual estimated age-standardised incidence of 1-6 per 1000. After the head and neck, the upper and lower limbs are the most common sites affected with 14% of SCCs occurring in these areas. SCC has the potential to be a highly aggressive tumour but there are no recent studies looking at the long-term outcome of patients with extremity SCC. A retrospective study was performed of 243 patients with a total of 517 upper and lower extremity SCCs who had been followed up for at least 4yrs. All patients' lesions were studied at one institution and data was collected from the Medical and Histopathology records. We found that there is only a low rate of recurrence or metastasis for extremity SCCs and that patients had a good prognosis overall.

[Malignant mediastinal teratoma--a case review]. / Maligni teratom mediastina--kazuistika.

In this case report the authors present a case of mediastinal malignant teratoma of a 23 years old patient, who suddenly suffers form chest pain as the only symptom. During examination is a huge mediastinal tumor diagnosed. After histological diagnosis is a radical surgery performed. According to the definitive histology is an adjutant oncological treatment indicated. The aim of our report is to think always about the mediastinal tumors as one of the possible cause of thoracic pain.

[Open pleural window at treatment of the advanced thoracic empyema: 20 high-risk patients' treatment experience]. / Otevrené pleurální okénko v lécbe pokrocilého empyému hrudníku: zkusenosti s lécbou dvaceti rizikových pacientu.

UNLABELLED: The aim of the retrospective clinical study was the analysis of the 20 high-risk patients operated in our department within years 2000-2008 by the modified Eloesser procedure for the serious thoracic empyema. MATERIAL AND METHODS: We have analyzed the data of the 17 men and 3 women. The most important objectives were the cause of the disease, type of procedure, perioperative mortality, length of stay and subsequent procedures. The underlying disease was the malignant intrathoracic disease in 40%, diabetes mellitus was found in 25%. The cause of empyema was pleuropneumonia in 45%, postresectional empyema occurred in 35%. RESULTS: There were two perioperative deaths (10%), remaining patients were all dismissed in a stabilized condition the 22nd postoperative day at average. Six subsequent reconstructive procedures were performed. There was no early death for the postpneumonectomy empyema. CONCLUSION: In case of the serious pleural empyema in a high-risk patient is the modified Eloesser procedure safe and life saving surgical operation. The timing of the procedure and correct indication for surgery are essential.

How happy are patients with their gynaecomastia reduction surgery?

Gynaecomastia reduction surgery is a common male cosmetic procedure. Our clinical experience suggested far lower rates of satisfaction than previously reported. Therefore we evaluated our patient group using a detailed questionnaire designed specifically to assess patient satisfaction with breast attributes and quality-of-life outcome following surgery. The questionnaire was sent to all patients who had surgery for gynaecomastia between January 2000 to January 2006. A total of 74 of the 120 patients contacted returned the questionnaire (62% overall response rate). The patients were divided into 3 groups according to their surgical treatment; liposuction only, excision only and combined excision plus liposuction. The majority of patients underwent surgery for reasons of self-confidence and emotional distress. In all groups surgery resulted in an increase in the mean Likert score (LS). The overall mean LS, combined from all the questions increased from 1.9 ('dissatisfied') to 3.2 ('neither satisfied nor dissatisfied'). Only 62.5% of all patients treated for gynaecomastia were 'satisfied' to 'very satisfied'. This more detailed study has shown that satisfaction rates are not as high as previously published. Patients must be appropriately counselled preoperatively to ensure they have realistic expectations of what can be achieved with surgery.

Trypanosoma cruzi infection beats the B-cell compartment favouring parasite establishment: can we strike first?

Trypanosoma cruzi, the causative agent of Chagas' disease, may sabotage humoral response by affecting B cells at the different stages of its development. The present review highlights the contributions of our laboratory in understanding how T. cruzi hinders B-cell generation and B-cell expansion limiting host defence and favouring its chronic establishment. We discuss how homoeostatic mechanisms can be triggered to control exacerbated B-cell proliferation that favour T. cruzi infection by eliminating parasite-specific B cells. Specific targeting of evasion mechanisms displayed in T. cruzi infection, as in vivo Fas/FasL blockade or Gal-3 expression inhibition, allowed us to modulate B-cell responses enhancing the anti-parasite humoral immune response. A comprehensive understanding of the biology of the B cell in health and disease is strictly required to devise immunointervention strategies aimed at enhancing protective immune responses during infections.