Chagas disease and transfusion medicine: a perspective from non-endemic countries

In the last decades, increasing international migration and travel from Latin America to Europe have favoured the emergence of tropical diseases outside their “historical” boundaries. Chagas disease, a zoonosis endemic in rural areas of Central and South America represents a clear example of this phenomenon. In the absence of the vector, one of the potential modes of transmission of Chagas disease in non-endemic regions is through blood and blood products. As most patients with Chagas disease are asymptomatic and unaware of their condition, in case of blood donation they can inadvertently represent a serious threat to the safety of the blood supply in non-endemic areas. Since the first cases of transfusion-transmitted Chagas disease were described in the last years, non-endemic countries began to develop ad hoc strategies to prevent and control the spread of the infection. United States, Spain, United Kingdom and France first recognised the need for Trypanosoma cruzi screening in at-risk blood donors. In this review, we trace an up-to-date perspective on Chagas disease, describing its peculiar features, from epidemiological, pathological, clinical and diagnostic points of view. Moreover, we describe the possible transmission of Chagas disease through blood or blood products and the current strategies for its control, focusing on non-endemic areas.     

Radiofrequency by open surgical approach in the treatment of hepatic tumours: early experience with 14 cases

The aim of the study was the evaluation of radiofrequency in the treatment of hepatic tumours during laparotomy performed for hepatic tumours. The initial experience with 14 patients operated for hepatic tumours (5 primary and 9 metastatic) is presented. The paper also presents the technique concerning the intensity and duration of the power applied, the association with the surgical resection, the immediate postoperative evolution and the dynamics of the hepatic enzymes as well as the postoperative results of ultrasound and CT examinations performed within the first 6 weeks. The indications of RF during laparotomy and the place of RF ablation in the treatment of liver tumours in comparison with other ablation techniques are discussed     

Supported Membranes Meet Flat Fluidics: Monitoring Dynamic Cell Adhesion on Pump-Free Microfluidics Chips Functionalized with Supported Membranes Displaying Mannose Domains

In this paper we demonstrate the combination of supported membranes and so-called flat microfluidics, which enables one to manipulate liquids on flat chip surfaces via “inverse piezoelectric effect”. Here, an alternating external electric field applied to the inter-digital transducers excites a surface acoustic wave on a piezoelectric substrate. Employing lithographic patterning of self-assembled monolayers of alkoxysilanes, we successfully confine a free-standing, hemi-cylindrical channel with the volume of merely 7 µL . The experimentally determined maximum flow velocity scales linearly with the acoustic power, suggesting that our current setup can drive liquids at the speed of up to 7 cm/s (corresponding to a shear rate of 280 s⁻¹) without applying high pressures using a fluidic pump. After the establishment of the functionalization of fluidic chip surfaces with supported membranes, we deposited asymmetric supported membranes displaying well-defined mannose domains and monitored the dynamic adhesion of E. Coli HB101 expressing mannose-binding receptors. Despite of the further technical optimization required for the quantitative analysis, the obtained results demonstrate that the combination of supported membranes and flat fluidics opens a large potential to investigate dynamic adhesion of cells on biofunctional membrane surfaces with the minimum amount of samples, without any fluidic pump.     

Sentinel lymph-node biopsy for breast cancer. Analysis of 235 cases and review of the literature

Sentinel lymph-node biopsy for breast cancer has been rapidly adopted in clinical practice. At the present time few prospective randomised studies exist, the false negative rate is variable and its role with regard to prognosis is not well known. The aim of this study was to evaluate the elements of sentinel lymph-node biopsy that have yet to be clearly defined, by reference to the literature and our own experience. From September 1999 to July 2005, we considered 235 consecutive patients undergoing sentinel lymph-node biopsy. We used the radioactive tracer in 143 cases, and the radiotracer combined with vital blue dye in 89 cases. Vital blue dye was used alone in only 3 cases. In 224 cases the sentinel lymph-node biopsy was performed in a single session, using frozen sections to evaluate the sentinel node. The identification rate obtained was 97.9% with the radiotracer, 100% with the combined procedure and 66.7% with vital blue alone. The sentinel node proved positive in 52 cases. The frozen sections correctly predicted the positive result of the definitive histopathological analysis in 26 cases and correctly predicted a negative result in 172. We discuss the indications and methods of sentinel lymph-node biopsy, analysing our own data and those reported in the literature.     

Safety in training and learning in the intensive care unit

Resident and subspecialty fellow trainees in the intensive care unit (ICU) present risks for patient safety because of their inexperience yet offer opportunities to promote safe patient care because of their around-the-clock presence and their involvement in frontline processes of care. Most trainees approach their ICU experiences without previous education in performance improvement or patient safety. This article reviews the barriers that are faced by residents in providing safe patient care and outlines the nature of a patient safety curriculum that could tap the opportunities that are presented by trainees to promote safer patient care.     

Ruptured hydatid cyst of the liver with biliary obstruction: presentation of a case and review of the literature

The case of a 66 year old woman admitted with a picture of jaundice acute cholangitis is reported. Ultrasonography showed a dilatation of intrahepatic bile ducts, gallbladder hydrops with several stones, enlarged common bile duct (CBD) with hyperechoic material inside and a cystic tumor with hydatid features. With a strong suspicion of a hydatid cyst ruptured in the biliary tree with biliary obstruction, endoscopic cholangiopancreatography was performed. The diagnosis was confirmed by endoscopic retrograde cholangiopancreatography and the hydatid membranes were extracted from the CBD with subsequent clinical improvement. The second step of treatment comprised the surgical cure of the cyst and cholecystectomy. The data from the literature are finally presented with a special emphasis on the ultrasound diagnosis and the endoscopic treatment.     

A rare cause of fatal right heart failure

Microscopic pulmonary tumor embolism (MPTE) is an uncommon cause of dyspnea in patients with cancer and one of the most difficult to diagnose. MPTE is a syndrome that is pathologically characterized by the occlusion of small pulmonary arteries and arterioles by aggregates of tumor cells. Because the clinical picture resembles that of thromboembolic disease, it is rarely recognized before death. The most common clinical symptom is subacute progressive dyspnea over weeks to months. We recently observed a case of MPTE of exceptional interest as the patient was under aggressive anticoagulant treatment and developed fulminant pulmonary hypertension with fatal right heart failure.     

Rapid induction of mild therapeutic hypothermia by extracorporeal veno-venous blood cooling in humans

Aim

Mild therapeutic hypothermia is beneficial in patients successfully resuscitated from non-traumatic out-of-hospital cardiac arrest. The effect of fast induction of hypothermia in these patients remains to be investigated. The aim of this study was to evaluate the efficacy and safety of extracorporeal veno-venous blood cooling in humans successfully resuscitated from cardiac arrest.

Methods

We performed an interventional study in patients after successful resuscitation from cardiac arrest admitted to the emergency department of a tertiary care centre. The extracorporeal veno-venous circulation was established via a percutaneously introduced double lumen dialysis catheter in the femoral vein, and a tubing circuit and heat exchanger. A paediatric cardiopulmonary bypass roller pump and a heater-cooler system were used to circulate the blood. Main outcome measures were feasibility, efficacy, and safety.

Results

We included eight consecutive cardiac arrest patients with a median oesophageal temperature of 35.9 °C (interquartile range 34.9–37.0). A median time of 8 min elapsed (interquartile range 5–15 min) to reach oesophageal temperatures below 34 °C, which reflects a cooling rate of 12.2 °C/h (interquartile range 10.8 °C/h to 14.1 °C/h). The predefined target temperature of 33.0 °C was reached after 14 min (interquartile range 8–21 min). No device or method related adverse events were reported.

Conclusion

Extracorporeal veno-venous blood cooling is a feasible, safe, and very fast approach for induction of mild therapeutic hypothermia in patients successfully resuscitated from cardiac arrest.     

Establishing community partnerships to support late-life anxiety research: lessons learned from the Calmer Life project

Objectives: This article outlines the development of the Calmer Life project, a partnership established between researchers and faith-based and social service organizations to examine the effectiveness of cognitive behavioral therapy (CBT) incorporating religious/spiritual components for older African Americans in low-income communities.

Method: The program was designed to bypass several barriers to delivery of CBT within the specified community; it allows multimodal delivery (in person or by telephone) that occurs outside traditional mental health settings through faith-based organizations and neighborhood community centers. It includes religion/spirituality as an element, dependent upon the preference of the participant, and is modular, so that people can select the skills they wish to learn. Established relationships within the community were built upon, and initial meetings were held in community settings, allowing feedback from community organizations.

Results: This ongoing program is functioning successfully and has strengthened relationships with community partners and facilitated increased availability of education and services in the community. The lessons learned in establishing these partnerships are outlined.

Conclusions: The growth of effectiveness research for late-life anxiety treatments in underserved minority populations requires development of functional partnerships between academic institutions and community stakeholders, along with treatment modifications to effectively address barriers faced by these consumers. The Calmer Life project may serve as a model.