The goal of this observational, prospective study is to in depth analyze the retinal microvasculature in patients with Post-COVID-19 Syndrome (PCS). The main questions it aims to answer is: Do patients with PCS show a prolonged endothelial dysfunction when compared with fully COVID-19 recovered participants? Does symptom severity in PCS patients correlate with the extend of endothelial dysfunction? Do these changes correlate with improvement in symptoms in the prospective observation?
The investigators will recruit patients with PCS, fully COVID-19 recovered participants and COVID-19 infection naïve participants. After comprehensive clarification and given written informed consent, measurements will take place in the Klinikum rechts der Isar. To evaluate the retinal microvasculature dynamic retinal vessel analysis (DVA) and optical coherence tomography (OCT) are used. Patient reported outcomes (PROM) of PCS typical symptoms will be collected using standardized questionnaires. To ensure data quality the investigators will use standard operating procedures (SOP) for both technical measurements and data collection. For DVA measurements all examiners will be trained by a single experienced supervisor and must reach high image accuracy and quality in at least 10 volunteers. Examiners are only involved in data acquisition.
Study Type
OBSERVATIONAL
Enrollment
300
DVA is an established, non-invasive tool to measure the responsiveness of retinal vessels to flickering light. In addition static retinal vessel parameters are recorded.
OCT is an imaging technique which applies low-coherence light to capture high resolution images from the ocular fundus.
Blood sample collection for clinical chemistry and isolation of PBMCs for FACS analysis.
Measure the maximum isometric strength of the hand and forearm muscles and their fatiguability.
The questionnaires evaluate anxiety, depression, chronic fatigue, quality of life, and post-covid typical symptoms
Klinikum rechts der Isar
München, Bavaria, Germany
RECRUITINGPCS patients show an impaired retinal vessel responsiveness when compared with fully recovered COVID-19 participants.
Static and dynamic parameters of the retinal vessel analysis.
Time frame: Baseline
PCS patients show an impaired retinal vessel responsiveness at baseline when compared with infection naïve participants.
Static and dynamic parameters of the retinal vessel analysis.
Time frame: Baseline
PCS patients with improved symptoms show a change in retinal vessel responsiveness after 6 months when compared with baseline parameters.
Static and dynamic parameters of the retinal vessel analysis. Test items of the The COVID-19 Yorkshire Rehabilitation Scale (C19-YRS) and PCS questionnaire. Calculation of PCS severity scores (Bahmer, 2022) in each patient with a range of score values from zero (better outcome) to 59 (worse outcome). Comparison of retinal vessel parameters and PCS scores between Baseline and month 6.
Time frame: Baseline to month 6
Symptom severity of PCS in patients correlates with impaired retinal vessel responsiveness.
Correlation between PCS severity scores with static and dynamic parameters of the retinal vessel analysis.
Time frame: Baseline
PCS patients with impaired RVA analysis show elevated levels of markers of endothelial dysfunction and of chronic inflammation when compared with COVID-19 recovered cohort.
Measurement of markers of endothelial dysfunction: Concentration of: sICAM, sVCAM, Thrombomodulin, P-Selectin,E-Selectin, ADMA, SADMA, Endothelin-1, ACE-1, ACE-2, ANG-2, GDF-15. Measurement of markers of chronic inflammation Concentration of IFN-β, IFN-λ1,TNFa. Comparison of marker levels to the COVID-19 recovered cohort.
Time frame: Baseline
PCS patients with impaired RVA show a reactivation of EBV.
Using PCR to measure EBV reactivation in patients plasma .
Time frame: Baseline
Characterization of immune cell composition in PCS patients and comparison with COVID-19 recovered and COVID-19 infection naïve participants.
Using flow cytometry to detect different T-cell and monocyte subpopulations.
Time frame: Baseline
PCS patients show a decrease in vessel density in OCT-A when compared with COVID-19 recovered participants.
Parameters of OCT-A.
Time frame: Baseline
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