The Quality of Infectious Disease Hospital Websites in Poland in Light of the COVID-19 Pandemic.

The quality of healthcare service websites gains particular importance in the time of the pandemic, asthe popularity of electronic services grows. This applies to infectious disease hospitals as well, often on the front line of the effort against COVID-19. The paper aims to assess the quality of infectious disease hospital websites in Poland in light of the COVID-19 pandemic. The research covered 91 websites. The first stage was an analysis of selected technical attributes of the websites (including website performance, SEO quality, website availability, and mobile-friendliness) with selected online tools, such as Google PageSpeed Insights, Blink Audit Tool, Backlink Checker, andwebsite accessibility evaluation tool (WAVE). The data were then analyzed with statistical methods. The next step was to analyze the content of the websites. The research has shown that most of the websites were of satisfactory quality, apart from those that were not mobile-ready. The following keywords were found most often on the hospital websites: SARS-CoV-2, COVID-19, smear, specialist care clinic, isolation, telephone consultations, sample collection center, support, coronavirus, recommendations, patient registration, signs of disease. The research suggests that the quality of infectious disease hospital websites in Poland is significantly diversified in search engine optimization, mobile-friendliness, and needs of people at risk of digital exclusion.

[Reentrant ventricular tachycardia treated with RF ablation delivered through coronary sinus - a case report]. / Burza elektryczna w przebiegu ustawicznego nawrotnego czestoskurczu komorowego o lokalizacji epikardialnej skutecznie leczonego ablacja RF z dojscia przez zatoke wiencowa.

A case of a 58 year-old man with epicardially located reentrant ventricular tachycardia treated with RF ablation delivered through coronary sinus is presented. Based on multiple electrophysiological parameters (surface ECG, electroanatomical map collected from the endocardium, bipolar and unipolar endocardial recordings, and unsuccesful ablation attempts from the endocardial side) the tachycardia loop was found to be located epicardially. This allowed for successful ablation approach.

Two-dimensional point spread matrix of layered metal-dielectric imaging elements.

We describe the change of the spatial distribution of the state of polarization occurring during two-dimensional (2D) imaging through a multilayer and in particular through a layered metallic flat lens. Linear or circular polarization of incident light is not preserved due to the difference in the amplitude transfer functions for the TM and TE polarizations. In effect, the transfer function and the point spread function (PSF) that characterize 2D imaging through a multilayer both have a matrix form, and cross-polarization coupling is observed for spatially modulated beams with a linear or circular incident polarization. The PSF in a matrix form is used to characterize the resolution of the superlens for different polarization states. We demonstrate how the 2D PSF may be used to design a simple diffractive nanoelement consisting of two radial slits. The structure assures the separation of nondiffracting radial beams originating from two slits in the mask and exhibits an interesting property of a backward power flow in between the two rings.