[Generalist palliative care in hospitals during the first wave of the COVID-19 pandemic]. / Allgemeine Palliativversorgung im Krankenhaus während der ersten Welle der COVID-19-Pandemie.

BACKGROUND: In the research network of German university palliative care centers (PallPan), as part of Network University Medicine (NUM), recommendations for action were developed in regard to the care provided for seriously ill and dying patients during a pandemic. For this purpose, the experiences and needs of hospital staff working closely with patients outside of specialized palliative care units during the first wave of the COVID-19 pandemic were also examined. MATERIALS AND METHODS: Nationwide online survey of 8,882 physicians, nurses and therapists working in acute inpatient care in the period from December 2020 to January 2021 by means of a newly developed and piloted questionnaire on changes, burdens and cooperation with specialized palliative care. Grouping based on the changes in the number of seriously ill and dying people in the first wave of the pandemic. Due to the exploratory character of the survey, the data were analyzed descriptively. RESULTS: 505/8882 completed questionnaires were evaluated (5.7 %). 167/505 (33.1 %) of the respondents reported a lower quality of care for the critically ill and dying. 464/505 (91.8 %) reported exemptions in place for visiting the dying. The most frequently mentioned stress factor was the perceived loneliness of the seriously ill and dying 437/505 (86.5 %), followed by stricter hygiene rules 409/505 (81 %), increased workload 372/505 (73.3 %) and perceived psychological stress on relatives and survivors 395/505 (78.2 %). 141/505 (27.9 %) of respondents used Tablet PCs to support patient-family communication. 310/505 (61.4 %) involved palliative care professionals in patient care, and 356/505 (70.5 %) of respondents found other palliative care services helpful. CONCLUSION: Experiences and suggestions for improving palliative care in pandemic times are integrated into the PallPan recommendations for action. Family visits should be allowed and supplemented by digital offers. Palliative Care should also be integrated into both pandemic and contingency plans.

Inpatient generalist palliative care during the SARS-CoV-2 pandemic - experiences, challenges and potential solutions from the perspective of health care workers.

BACKGROUND: The SARS-CoV-2 pandemic has presented major challenges to the health system. Despite high acute case numbers, patients without Covid-19 still need to be cared for. Due to the severity of the disease and a possible stressful overall situation, patients with palliative care needs also require comprehensive care during pandemic times. In addition to specialized palliative care facilities, this also takes place in non palliative care wards. In order to ensure this general palliative care also in pandemic times, the experience of the staff should be used. The aim of this paper is to examine challenges and possible solutions for general palliative care inpatients in relation to the care of seriously ill and dying patients and their relatives. METHODS: Qualitative semi-structured focus groups were conducted online for the study. Participants were staff from intensive care or isolation wards or from units where vulnerable patients (e.g. with cognitive impairment) are cared for. The focus groups were recorded and subsequently transcribed. The data material was analysed with the content structuring content analysis according to Kuckartz. RESULTS: Five focus groups with four to eight health care professionals with various backgrounds were conducted. Fifteen main categories with two to eight subcategories were identified. Based on frequency and the importance expressed by the focus groups, six categories were extracted as central aspects: visiting regulations, communication with relatives, hygiene measures, cooperation, determination of the patients will and the possibility to say good bye. CONCLUSION: The pandemic situation produced several challenges needing specific solutions in order to manage the care of seriously ill and dying patients. Especially visiting needs regulation to prevent social isolation and dying alone. Finding alternative communication ways as well as interprofessional and interdisciplinary cooperation is a precondition for individualised care of seriously ill and dying patients and their relatives. Measures preventing infections should be transparently communicated in hospitals.

The consolidation of nanomedicine.

Over the past two decades, nanomedicine has grown steadily, however, without inducing a palpable shift in the diagnosis and treatment of diseases so far. While this may simply be a consequence of the slow, incremental nature that characterizes many modern technologies, this article posits that there is another set of significant factors harboring explanatory power. Uncertainties concerning safety, regulatory, and ethical requirements may have prompted innovators to stay close to the known and approved, eventually at the cost of innovating in unexplored alleys. Network analysis of all nanomedicine patents in the United States reveals that nanomedicine has indeed rather consolidated than expanded. We detail a set of recommendations that would reduce the uncertainty prevailing in nanomedicine and could contribute to pushing new boundaries. This article is categorized under: Toxicology and Regulatory Issues in Nanomedicine > Regulatory and Policy Issues in Nanomedicine.

Calibration of RGBD camera and cone-beam CT for 3D intra-operative mixed reality visualization.

PURPOSE: This work proposes a novel algorithm to register cone-beam computed tomography (CBCT) volumes and 3D optical (RGBD) camera views. The co-registered real-time RGBD camera and CBCT imaging enable a novel augmented reality solution for orthopedic surgeries, which allows arbitrary views using digitally reconstructed radiographs overlaid on the reconstructed patient's surface without the need to move the C-arm. METHODS: An RGBD camera is rigidly mounted on the C-arm near the detector. We introduce a calibration method based on the simultaneous reconstruction of the surface and the CBCT scan of an object. The transformation between the two coordinate spaces is recovered using Fast Point Feature Histogram descriptors and the Iterative Closest Point algorithm. RESULTS: Several experiments are performed to assess the repeatability and the accuracy of this method. Target registration error is measured on multiple visual and radio-opaque landmarks to evaluate the accuracy of the registration. Mixed reality visualizations from arbitrary angles are also presented for simulated orthopedic surgeries. CONCLUSION: To the best of our knowledge, this is the first calibration method which uses only tomographic and RGBD reconstructions. This means that the method does not impose a particular shape of the phantom. We demonstrate a marker-less calibration of CBCT volumes and 3D depth cameras, achieving reasonable registration accuracy. This design requires a one-time factory calibration, is self-contained, and could be integrated into existing mobile C-arms to provide real-time augmented reality views from arbitrary angles.

Preclinical usability study of multiple augmented reality concepts for K-wire placement.

PURPOSE: In many orthopedic surgeries, there is a demand for correctly placing medical instruments (e.g., K-wire or drill) to perform bone fracture repairs. The main challenge is the mental alignment of X-ray images acquired using a C-arm, the medical instruments, and the patient, which dramatically increases in complexity during pelvic surgeries. Current solutions include the continuous acquisition of many intra-operative X-ray images from various views, which will result in high radiation exposure, long surgical durations, and significant effort and frustration for the surgical staff. This work conducts a preclinical usability study to test and evaluate mixed reality visualization techniques using intra-operative X-ray, optical, and RGBD imaging to augment the surgeon's view to assist accurate placement of tools. METHOD: We design and perform a usability study to compare the performance of surgeons and their task load using three different mixed reality systems during K-wire placements. The three systems are interventional X-ray imaging, X-ray augmentation on 2D video, and 3D surface reconstruction augmented by digitally reconstructed radiographs and live tool visualization. RESULTS: The evaluation criteria include duration, number of X-ray images acquired, placement accuracy, and the surgical task load, which are observed during 21 clinically relevant interventions performed by surgeons on phantoms. Finally, we test for statistically significant improvements and show that the mixed reality visualization leads to a significantly improved efficiency. CONCLUSION: The 3D visualization of patient, tool, and DRR shows clear advantages over the conventional X-ray imaging and provides intuitive feedback to place the medical tools correctly and efficiently.

Investigation of the inter-observer variability effect on the prognostic value of somatosensory evoked potentials of the median nerve (SSEP) in cardiac arrest survivors using an SSEP classification.

BACKGROUND AND PURPOSE: We investigated the inter-observer variability in interpretation of median nerve SSEPs with regard to neurological prognosis in survivors of cardiac arrest (CA). METHODS: Four experienced neurologists analyzed 163 median nerve SSEPs on the basis of a pre-defined classification of SSEPs into five patterns (A-E), with consideration of cortical potentials up to a latency of 150ms. Of these, 133 recordings were from CA survivors and 30 were from healthy volunteers. The experts were blinded to whether a SSEP finding was from a CA survivor or a healthy volunteer. They were also unaware of the neurological outcome for the resuscitated patients. Three categories were defined for decision making. These were "good neurological outcome" represented by patterns A-C, "poor neurological outcome" (patterns D and E), and "not evaluable". Experts' agreement was calculated using the kappa-coefficient. RESULTS: The mean correct prediction by the experts was 81.8% (range 76.3-86.6%) in resuscitated patients with good neurological outcome. In those with poor neurological outcome, however, correct prediction was achieved in only 63% (60.5-66%). All SSEPs from healthy volunteers were classified as "good neurological outcome". The kappa-coefficient (κ) for all decision-making classifications was 0.75; for patients with poor outcome it was 0.76 and for those with good outcome 0.88. The predictive value for poor neurological outcome of the SSEP pattern D achieved a specificity of 93.5% and that of E a specificity of 98.4%. CONCLUSION: Our study demonstrates good inter-observer agreement in the interpretation of median nerve SSEPs in CA survivors on the basis of a pre-defined SSEP evaluation set. The strongest correlation with poor outcome was found for pattern E, bilateral absence of the N20 peak.

Greater occipital nerve neuralgia caused by pathological arterial contact: treatment by surgical decompression.

Occipital nerve neuralgia is a rare cause of severe headache, and may be difficult to treat. We report the case of a patient with occipital nerve neuralgia caused by pathological contact of the nerve with the occipital artery. The pain was refractory to medical treatment. Surgical decompression yielded complete remission.

Agreement of multislice CT angiography and MR angiography in assessing the degree of carotid artery stenosis in consideration of different methods of postprocessing.

OBJECTIVE: We investigated the agreement of multislice computed tomography angiography (CTA) and magnetic resonance angiography (MRA) in the quantitative measurement of carotid artery stenosis. The dependency of the agreement of the chosen postprocessing procedures was also investigated. METHODS: Fifty consecutive symptomatic patients were included in this study. In all patients, a CTA was performed with a 16-slice CT scanner. Within 30 days, the extracranial vessels were examined using a combined time-of-flight and contrast-enhanced MRA. The CT data sets were used to calculate the degree of stenosis according to the North American Symptomatic Carotid Endarterectomy Trial, European Carotid Surgery Trial, and Common Carotid methods by means of the 1-mm thick, transverse raw data (RD), a sagittal maximum-intensity projection reconstruction, and sagittal multiplanar reconstruction. In addition, a semiautomated analysis was done using a specialized postprocessing software. For all combinations of postprocessing procedures and methods of calculating the degree of stenosis, the correlation coefficient and the agreement based on Bland/Altman plots were calculated. RESULTS: Eleven of the 100 primarily included carotid arteries could not be evaluated. The correlation coefficients for all combinations were comparable and lied in the interval between 0.932 and 0.787. The best correlation was found for the combination of RD/sagittal multiplanar reconstruction and ECST method. The evaluation of the agreement gave a systematic overestimation of CTA between 1.9% and 10.7% with a 95% confidence interval between +/-26.7% and +/-43.3%. With the semiautomated postprocessing software, additional 33 vessels could not be evaluated. The agreement of the calculated degrees of stenoses was worse than that of the planar procedures. CONCLUSIONS: CTA and MRA had a feasible agreement in measuring the degree of stenosis of the carotid arteries. The best result could be obtained for the evaluation of the RD and the NASCET method. In this case one has to take into account a systematic overestimation of CTA of 1.9%. The combination with an additional reconstructive postprocessing procedure did not improve the result but might be useful for the radiologist to identify the location of the closest narrowing.