Comparison of electrode position marking procedures on the cranial surface

INTRODUCTION

The study aimed to compare the conventional method of electrode marking with a new system, EPlacement, to improve accuracy and reduce the time burden on health care professionals.

METHODS

Ten health care professionals marked mannequin heads and adult volunteers using both methods. Time, accuracy, and usability of each method were analyzed. Three neurophysiological diagnostic tests were performed on mannequin heads: reversal pattern visual evoked potential (three electrodes required); somatosensory evoked potentials from the upper and lower extremities (five electrodes required); and standard intraoperative neurophysiological monitoring for spine surgery (nine electrodes required). Precision scanning of the mannequins with structured light and a printed hull were used to determine the actual locations of the electrodes of the 10/20 system.

RESULTS

The new method based on the EPlacement device represents an improvement on conventional tape measure (TM) marking and may be considered within the group of advanced methods such as navigation systems since it leads to improvements of 34% (1.7 mm) for electrode positions in the Nasion-Inion and Left tragus-Right tragus lines and 77% (12.5 mm) for electrode positions using the approximate method. It reduces the time spent per test by an average of 1 min compared to the TM method. Health care staff survey results show a positive feedback regarding usability of the new method.

CONCLUSIONS

The study showed that the EPlacement device improves accuracy, reduces time, and is easy to use compared to the conventional method of electrode marking. The EPlacement method can facilitate the complex task of electrode marking and ultimately contribute to improved patient outcomes. It has the potential to be widely accepted and implemented in clinical practice.

Regional growth and disparities in a post-COVID Europe: A new normality scenario

This paper addresses the important question "Which European areas will be able to better react to the crisis induced by COVID-19 and how regional disparities will look like?" To provide an answer, a "new normality" scenario is built, comprising the structural changes likely to take place in the aftermath of the COVID pandemic. To develop such scenario, two intermediate steps are necessary, in both cases relying on the use of the latest generation of the MAcroeconomic, Sectoral, Social, Territorial (MASST4) model. First, short-run costs of the COVID-induced lockdowns, in terms of missed GDP, are calculated for all European NUTS2 regions, needed because of the lack of short-run statistics about the extent of the regional costs caused by the lockdowns that will only appear in 2 years. Second, a long-run simulation of the economic rebound expected to take place from 2021 through 2030 is presented, assuming, among other trends, that no further national lockdowns will be undertaken in European countries. In the "new normality" scenario, regional disparity trends will decrease as a result of a decisive rebound of those countries mostly hit by the pandemic.