Silicone adhesive multilayer foam dressings as adjuvant prophylactic therapy to prevent hospital-acquired pressure ulcers : a pragmatic noncommercial multicentre randomized open-label parallel-group medical device trial

Background: Silicone adhesive multilayer foam dressings are used as adjuvant therapy to prevent hospital‐acquired pressure ulcers (PUs). Objectives: Determine if silicone foam dressings in addition to standard prevention reduce PU incidence category 2 or worse compared to standard prevention alone. Methods: Multicentre, randomised controlled, medical device trial conducted in eight Belgian hospitals. At risk adult patients were centrally randomised (n=1633) to study groups based on a 1:1:1 allocation: experimental group 1 (n=542) and 2 (n=545) ‐ pooled as the treatment group ‐ and the control group (n=546). Experimental groups received PU prevention according to hospital protocol, and a silicone foam dressing on these body sites. The control group received standard of care. The primary endpoint was the incidence of a new PU category 2 or worse at these body sites. Results: In the intention‐to‐treat population (n=1605); 4.0% of patients developed PUs category 2 or worse in the treatment group and 6.3% in the control group (RR=0.64, 95% CI 0.41 to 0.99, P=0.04). Sacral PUs were observed in 2.8% and 4.8% of the patients in the treatment group and the control group, respectively (RR=0.59, 95% CI 0.35 to 0.98, P=0.04). Heel PUs occurred in 1.4% and 1.9% of patients in the treatment and control group respectively (RR=0.76, 95% CI 0.34 to 1.68, P=0.49). Conclusions: Silicone foam dressings reduce the incidence of PUs category 2 or worse in hospitalised at‐risk patients when used in addition to standard of care. Results show a decrease for sacrum, but no statistical difference for heel/trochanter areas

Validation Studies for Single Circulating Trophoblast Genetic Testing as a Form of Noninvasive Prenatal Diagnosis

It has long been appreciated that genetic analysis of fetal or trophoblast cells in maternal blood could revolutionize prenatal diagnosis. We implemented a protocol for single circulating trophoblast (SCT) testing using positive selection by magnetic-activated cell sorting and single-cell low-coverage whole-genome sequencing to detect fetal aneuploidies and copy-number variants (CNVs) at ∼1 Mb resolution. In 95 validation cases, we identified on average 0.20 putative trophoblasts/mL, of which 55% were of high quality and scorable for both aneuploidy and CNVs. We emphasize the importance of analyzing individual cells because some cells are apoptotic, in S-phase, or otherwise of poor quality. When two or more high-quality trophoblast cells were available for singleton pregnancies, there was complete concordance between all trophoblasts unless there was evidence of confined placental mosaicism. SCT results were highly concordant with available clinical data from chorionic villus sampling (CVS) or amniocentesis procedures. Although determining the exact sensitivity and specificity will require more data, this study further supports the potential for SCT testing to become a diagnostic prenatal test

Security evaluation of cyber-physical systems using automatically generated attack trees

© Springer Nature Switzerland AG 2018. The security of cyber-physical systems (CPS) is often lacking. This abstract presents a methodology that performs a security evaluation of these systems by automatically generating attack trees based on the system model. The assessor can define different kinds of attackers and see how the attack tree is evaluated with respect to a specific type of attacker. Optimal attacker strategies are calculated and from here the most vulnerable elements of the system can be derived.status: publishe

Level of education and the risk of malignant-melanoma

Background: The risk for the development of malignant melanoma has been reported to be higher in persons with more formal education than in individuals with less. Objective: To study whether those with more formal education are indeed at more risk for malignant melanoma than those with less formal education. Methods: This case-control study explores the relation between education and melanoma risk by analyzing data collected by the American Cancer Society. A total of 1.2 million people were surveyed for a history of cancer and followed up for 6 years for the development of any cancer. In total, 2780 white persons had a history of malignant melanoma or developed malignant melanoma during the study period. The controls were age-, sex-, and geographically matched white persons selected from the remaining people enrolled. Results: Both men and women were shown to have a statistically significant increase in the relative risk for malignant melanoma with increasing education level (p < 0.001 and p = 0.001, respectively). This relation was more striking in men when the relative risk with 95% confidence interval was calculated by sex for each education level. Conclusion: Americans with more formal education are at greater risk for malignant melanoma than those with less education

Evaluation of primary care physicians' competence in selective skin tumour triage after short versus long dermoscopy training: a randomized non-inferiority trial

Background: Although primary care physicians (PCPs) play a key role in skin cancer screening, their skills in detecting malignant tumours is suboptimal. Objectives: To determine whether a short dermoscopy e-learning course (4 h) in skin tumour diagnosis for PCPs is non-inferior to a long course (12 h) in selective triage of skin lesions. Secondly, to evaluate whether regular refresher training sessions are necessary to maintain the PCPs' skills in the medium term. Methods: A randomized 2 × 2 factorial non-inferiority trial was conducted online over an 8-month period among 233 PCPs including 126 certified general practitioners, 94 PCPs in training, and 13 occupational physicians, all without prior advanced dermoscopy training. Participants were randomized 1:1:1:1 to receive short training and mandatory refreshers (n = 58), short training and optional refreshers (n = 59), long training and mandatory refreshers (n = 58), or long training and optional refreshers (n = 58). PCPs' skills were evaluated before training (T0), immediately after training (T1) to test the non-inferiority, and after 5 months (T2) to evaluate the impact of the refreshers. The primary endpoint was the difference in the change of score after short and long training. The non-inferiority margin was set at −28%. Results: Among the 233 randomized participants, 216 (93%) completed T1 and 197 (84.5%) completed T2. For short versus long training, the primary endpoint was 1.392 (95% CI: 0.138; 2.645) in the per-protocol population (p &lt; 0.001) and 1.016 (95% CI: −0.224; 2.256) in the modified intention-to-treat population (p &lt; 0.001). After training, the type of refresher showed no impact on the score (p = 0.840). However, PCPs who completed all refreshers showed the best mean overall score at T2 (p &lt; 0.001). Conclusions: These findings confirm that short dermoscopy e-learning is non-inferior in training PCPs to triage skin lesions compared to long training. After training, regular refreshers are important to maintain the PCPs' acquired skills over time