Cochlear implant positioning: development and validation of an automatic method using computed tomography image analysis.

The aim of this study was to preoperatively asses the feasibility of drilling a bony recess for the fixation of a cochlear implant in the temporal bone. Even though complications are rare with cochlear implantations, drilling at the site of implantation have resulted in hematoma or cerebrospinal fluid leakage. Mainly in cases with a reduced temporal bone thickness, the risk for complications has increased, such as in paediatric patients. Methods: An in-house designed semi-automatic algorithm was developed to analyse a 3D model of the skull. The feasibility of drilling the recess was determined by a gradient descent method to search for the thickest part of the temporal bone. Feasibility was determined by the residual bone thickness which was calculated after a simulated drilling of the recess at the thickest position. An initial validation of the algorithm was performed by measuring the accuracy of the algorithm on five 3D models with known thickest locations for the recess. The accuracy was determined by a part comparison between the known position and algorithm provided position. Results: In four of the five validation models a standard deviation for accuracy below the predetermined cut-off value of 4.2 mm was achieved between the actual thickest position and the position determined by the algorithm. Furthermore, the residual thickness calculated by the algorithm showed a high agreement (max. 0.02 mm difference) with the actual thickness. Conclusion: With the developed algorithm, a semi-automatic method was created to analyse the temporal bone thickness within a specified region of interest on the skull. Thereby, providing indications for surgical feasibility, potential risks for anatomical structures and impact on procedure time of cochlear implantation. This method could be a valuable research tool to objectively assess feasibility of drilling a recess in patients with thin temporal bones preoperatively.

Active counselling and well-controlled disease result in a higher percentage of women with rheumatoid arthritis that breast feed: results from the PreCARA study.

OBJECTIVES: Previous research has demonstrated that patients with rheumatoid arthritis (RA) are less likely to breast feed their offspring. Treatment options for RA during lactation have expanded and the importance of counselling is recognised. The aim of the current research was to study breast feeding among women with RA who benefit from these developments. METHODS: Patients were derived from the Preconceptional Counselling in Active Rheumatoid Arthritis (PreCARA) cohort. Patients were treated according to a modified treat-to-target approach aimed at remission and received pregnancy counselling, including counselling on breast feeding. Postpartum visits were scheduled at 4-6, 12 and 26 weeks post partum. Prevalence of breast feeding at each postpartum visit was compared with a historical reference cohort (Pregnancy-induced Amelioration of Rheumatoid Arthritis cohort) and the general population. RESULTS: Data on 171 pregnancies were available for the current analysis. 120 (70.2%) patients with RA initiated breast feeding. 103/171 (60.2%), 68/171 (39.8%) and 45/171 (26.3%) patients with RA breast fed their offspring at 4-6, 12 and 26 weeks post partum, respectively. These percentages were higher at all postpartum visits compared with the historical reference cohort (p<0.001). In comparison with the general population, the rates were similar at each time point. CONCLUSION: Patients with RA in the PreCARA cohort were more likely to breast feed their offspring compared with patients with RA in the historical reference cohort. The breastfeeding rates observed were similar to breastfeeding rates among women in the general population. The increase in breast feeding among patients with RA may be due to the extension of lactation-compatible medication and pregnancy counselling.

Analysing cord blood levels of TNF inhibitors to validate the EULAR points to consider for TNF inhibitor use during pregnancy.

BACKGROUND: To minimise placental transfer of tumour necrosis factor inhibitors (TNFi), the European League Against Rheumatism (EULAR) created points to consider (PtC) for the use of TNFi during pregnancy. We are the first to validate the EULAR-PtC by analysing TNFi concentrations in cord blood. METHODS: Patients were derived from the Preconceptional Counselling in Active Rheumatoid Arthritis Study. TNFi was stopped at the time points recommended by the EULAR. Maternal blood and cord blood were collected and analysed for the concentration of TNFi. RESULTS: 111 patients were eligible for the analysis. Median stop time points were gestational age (GA) 37.0 weeks for certolizumab pegol, GA 25.0 weeks for etanercept, GA 19.0 weeks for adalimumab and GA 18.4 weeks for infliximab. Certolizumab pegol (n=68) was detectable in 5.9% of cord blood samples, with a median concentration of 0.3 µg/mL (IQR: 0.2-1.3) and a median cord/maternal concentration ratio of 0.010. Etanercept (n=30) was not detected in any cord blood samples. Adalimumab (n=25) was detectable in 48.0% of cord blood samples, with a median concentration of 0.5 µg/mL (IQR: 0.2-0.7) and a median concentration ratio of 0.062 (IQR: 0.018-0.15). Infliximab (n=14) was detectable in 57.1% of cord blood samples, with a median concentration of 0.4 µg/mL (IQR: 0.1-1.2) and a median concentration ratio of 0.012 (IQR: 0.006-0.081). CONCLUSION: Compliance with the EULAR-PtC results in absence or low levels of TNFi in cord blood.

Human-Centered Design Thinking in Radiology.

Design thinking is an innovative, human-centered approach to problem-solving. In design thinking, teams step away from immediate and reactionary approaches to complex problems in favor of novel, broader approaches. The key tenets of empathy and user-centered insights are emphasized. The primary objective in this holistic approach is to keep the needs, desires, and behaviors of all stakeholders involved in the ecosystem at the center of the design process. This approach creates more extensive, more diverse, and more productive teams in which each member is invested in the changes being designed and proposed. This review highlights the methodology, outcome metrics, advantages, and challenges of human-centered design in health care and radiology.