Suchergebnisse

The problem of piracy and armed robbery at sea has sharply risen in the last decades. As a result, shipping companies, governments, insurances and maritime organisations have tried to approach the problem in different ways, the employment of private maritime security companies being one of them. State navies do not have enough resources to cover the vast areas of the high seas. As a result, armed security teams are exercising traditional State functions to protect vessels from being attacked. This study aims to find the legal foundations in international public law for the employment of armed guards on-board of commercial or private vessels. Furthermore, legal questions about the seizing of pirates, the use of force, criminal jurisdiction on-board of ships and the carrying of weapons will be scrutinized. For this purpose, the applicability of the Geneva Conventions and other key documents of the international humanitarian law will be analysed such as the Montreux Document and the Draft International Convention on the Regulation, Oversight and Monitoring of Private Military and Security Companies. Moreover, relevant aspects of the UNCLOS rules will be highlighted. An additional chapter will review existing international and regional soft law standards, mainly developed by the shipping and the security industry. The analysis concludes that international law has not yet developed distinct rules for the use of private maritime security companies. Especially the UNCLOS does not deal with private actors in the fight against piracy at all. As a result, national law remains responsible for the creation of a comprehensive set of rules concerning the employment and the conduct of maritime security guards. In addition, the vast number of soft law guidance and standards are missing enforceable and effective mechanisms and cannot yet be seen as an alternative for national regulations.

Objective The aim of the study was to compare two techniques for external ventricular drainage (EVD) placement with respect to their complication rates.
Methods A retrospective descriptive study was performed to analyze all patients who had undergone EVD implantation for acute hydrocephalus between January 2010 and December 2013 with a focus on surgical technique and rate of complications. The burr hole technique (BHT) was used in one group and the twist-drill technique (TDT) in the other. Particular attention was paid to malposition, hemorrhage, and catheter-associated infection.
Results A total of 350 consecutive patients underwent EVD implantation for acute hydrocephalus: BHT was performed in 201 and TDT in 147 of the patients, whereas in two patients the technique used was unknown. The overall infection rate was 6.3% (n = 22). Fourteen patients (4%) in the BHT group developed an infection compared with eight patients (9.5%) in the TDT group (p = 0.154). In 16 (4.5%) of all cases, postoperative computed tomography revealed catheter-induced hemorrhage.In one case (0.3%), surgery was necessary due to acute subdural hematoma. The difference between both techniques was not statistically significant (p = 0.343). In 44 (12.6%) of all cases, the position of the EVD tip was contralateral; in 36 (10.3%) of all cases, the EVD tip was in the brain parenchyma. The rate of malposition was 11.6% (n = 17) in the TDT group and 9.5% (n = 19) in the BHT group (p = 0.078).
Conclusion Neither technique showed significantly different numbers in terms of infection, malposition, and hemorrhagic complications. EVD implantation using the TDT is an adequate method compared with BHT. The advantages of TDT are clear: the duration of surgery is shorter, the size of the wound is smaller, and the surgeon is not confined to the operating room.

Abstract
Background Ventriculostomy (VST) is a frequent neurosurgical procedure. Freehand catheter placement represents the standard current practice. However, multiple attempts are often required. We present augmented reality (AR) headset guided VST with in-house developed head models. We conducted a proof of concept study in which we tested AR-guided as well as freehand VST. Repeated AR punctures were conducted to investigate if a learning curve can be derived.
Methods Five custom-made 3D-printed head models, each holding an anatomically different ventricular system, were filled with agarose gel. Eleven surgeons placed two AR-guided as well as two freehand ventricular drains per head. A subgroup of four surgeons did a total of three series of AR-guided punctures each to test for a learning curve. A Microsoft HoloLens served as the hardware platform. The marker-based tracking did not require rigid head fixation. Catheter tip position was evaluated in computed tomography scans.
Results Marker-tracking, image segmentation, and holographic display worked satisfactorily. In freehand VST, a success rate of 72.7% was achieved, which was higher than under AR guidance (68.2%, difference not statistically significant). Repeated AR-guided punctures increased the success rate from 65 to 95%. We assume a steep learning curve as repeated AR-guided punctures led to an increase in successful attempts. Overall user experience showed positive feedback.
Conclusions We achieved promising results that encourage the continued development and technical improvement. However, several more developmental steps have to be taken before an application in humans can be considered. In the future, AR headset–based holograms have the potential to serve as a compact navigational help inside and outside the operating room.

Abstract
Background World Health Organization (WHO) grade II low-grade gliomas (LGGs) in adults are rare, and patients' mean overall survival (OS) is relatively long. Epidemiological data on factors influencing tumor genesis and progression are scarce, and prospective data on surgical management are still lacking. Because of the molecular heterogeneity of LGG, a comprehensive molecular characterization is required for any clinical and epidemiological research. Further, a detailed radiologic assessment is needed as the only established objective criterion for progressive disease. Both radiologic and molecular assessments have to be standardized to produce comparable data. The aim of the registry is to improve the evidence for surgical management of LGG patients by establishing a multicenter registry with a strong surgical and clinical focus including mandatory biobanking.
Methods The LoG-Glio project is a prospective national observational multicenter registry that began on November 1, 2015. Inclusion criteria encompass all patients > 18 years of age with a radiologic suspicion of LGG. Patients with severe neurologic or psychiatric disorders that may interfere with their informed consent or if there is no possibility for further follow-up are excluded. Diagnosis of glioblastoma WHO grade IV isocitrate dehydrogenase (IDH) wild type leads to a secondary exclusion of patients. In addition to demographic data, results of the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire, add-on for patients with brain tumors, and National Health Institute Stroke Scale before and after surgery and during regular follow-ups are collected. At each time point a detailed recording of surgical and adjuvant treatment is performed. Radiologic assessment involves three-dimensional (3D) acquisition of T1, fluid-attenuated inversion recovery, and T2 sequences. For the final evaluation, a central detailed neuropathologic and molecular assessment of tumor samples and a radiologic evaluation of imaging sets are part of the study protocol.
Results We report the first 100 consecutively registered patients for LoG-Glio. Three patients dropped out due to loss of follow-up. Of the remaining recruited patients, 8 were classified as wait and scan; 89 had surgery. Using the inclusion criteria described previously, 70 patients had an IDH-mutated glioma, 10 had miscellaneous rare LGGs, and 8 patients had an IDH wild-type WHO grade II or III glioma.
Conclusion The LoG-Glio registry has been successfully implemented. Applied selection criteria result in an appropriately balanced patient cohort. Short-term outcome data on epidemiology as well as the influence of current surgical techniques and adjuvant treatment on patient outcomes are expected. In the long run, the aim of the registry is to validate the new molecular-based WHO classification and the influence of the extent of resection on progression-free survival and OS. The registry provides an open platform for future research projects benefiting patients with LGG.