Coronavirus Disease 2019-Related Alterations of Total and Anti-Spike IgG Glycosylation in Relation to Age and Anti-Spike IgG Titer.

The coronavirus disease 2019 (COVID-19) caused by the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) has been affecting the world since January 2020 and has caused millions of deaths. To gain a better insight into molecular changes underlying the COVID-19 disease, we investigated here the N-glycosylation of three immunoglobulin G (IgG) fractions isolated from plasma of 35 severe COVID-19 patients, namely total IgG1, total IgG2, and anti-Spike IgG, by means of MALDI-TOF-MS. All analyses were performed at the glycopeptide level to assure subclass- and site-specific information. For each COVID-19 patient, the analyses included three blood withdrawals at different time-points of hospitalization, which allowed profiling longitudinal alterations in IgG glycosylation. The COVID-19 patients presented altered IgG N-glycosylation profiles in all investigated IgG fractions. The most pronounced COVID-19-related changes were observed in the glycosylation profiles of antigen-specific anti-Spike IgG1. Anti-Spike IgG1 fucosylation and galactosylation showed the strongest variation during the disease course, with the difference in anti-Spike IgG1 fucosylation being significantly correlated with patients' age. Decreases in anti-Spike IgG1 galactosylation and sialylation in the course of the disease were found to be significantly correlated with the difference in anti-Spike IgG plasma concentration. The present findings suggest that patients' age and anti-S IgG abundance might influence IgG N-glycosylation alterations occurring in COVID-19.

[Anaesthics incidents - Injuries caused by regional anaesthesia - closed claims of the North German Arbitration Board]. / Anästhesiezwischenfälle - Schäden durch Regionalanästhesie - "closed claims" der Norddeutschen Schlichtungsstelle.

Injuries caused by regional anaesthesia are the second most common reason for a patient to apply to the North German Arbitration Board. Part of the reported injuries are mild and transient, while others are severe and permanent, e.g. a paraplegia after regional anaesthesia. In the majority of the reported cases, the Arbitration Board did not find a medical error as cause of the injury. Nevertheless, every possible effort needs to be made to reduce the number and the severity of the injuries due to regional anaesthesia. In order to reach that goal, medical treatment has to be applied with the appropriate care, including the strict adherence to the height of puncture for epidural and spinal anaesthesia below the Conus medullaris and the use of assisting devices like nerve stimulator and ultrasound-guided puncture. Using these measures, the frequency of injuries caused by regional anaesthesia will be reduced.