#4473 PREVALENCE OF POST-COVID-19 CONDITION IN PATIENTS WITH CHRONIC KIDNEY DISEASE, ON DIALYSIS AND LIVING WITH A KIDNEY TRANSPLANT

Background and Aims The prevalence of post-COVID-19 condition (PCC) is estimated to be 13% in healthy individuals. We analyzed the prevalence and disease burden of PCC in patients with chronic kidney disease (CKD) G4/5, dialysis patients and kidney transplant recipients (KTR). Method Patients participated in the RECOVAC study, in which SARS-CoV-2 antibodies were measured in CKD G4/5, dialysis patients and KTR after the second and third COVID-19 vaccination in the Netherlands. A questionnaire was sent to 4868 participants one year after initial vaccination asking for the presence of long-lasting symptoms after diagnosis in COVID-19 positive patients, or since the start of the pandemic in COVID-19 negative patients. PCC was defined according to the WHO clinical case definition. Blood samples at one month after the second and third vaccination were analysed with anti-RBD IgG ELISA. COVID-19 diagnosis was assessed by questionnaire or positive anti-nucleocapsid IgG antibodies. Logistic regression analysis was used to compare the presence of one or more long-lasting symptoms between COVID-19 positive and negative patients. In COVID-19 positive patients, we likewise identified predictors of PCC by backward selection and estimated the association between log-transformed antibody levels and PCC. Results 2747 patients were included, of which 222 patients with CKD G4/5, 390 dialysis patients and 2135 KTR. PCC was present in 25%, 16%, and 21% of CKD G4/5 patients, dialysis patients and KTR with high or very high symptom burden in 57%, 61% and 71%, respectively. In COVID-19 negative patients, long-lasting symptoms were present in 15%, 13% and 18%, respectively. COVID-19 positive patients (n = 1004) were at higher odds of having one or more long-lasting symptoms compared with COVID-19 negative patients (n = 1743) (OR: 1.33 [1.09–1.61], p = .005). Predictors of PCC were chronic lung disease (adjusted OR 2.04 [1.18#x2013;3.50], p = .01) and hospital/ICU admission (adjusted OR 5.03 [3.22-7.86], p < .001). Log anti-RBD IgG antibody level was negatively associated with PCC (adjusted OR: 0.79 [0.66#x2013;0.94], p = .008). Conclusion Patients with CKD G4/5, dialysis patients and KTR are at risk for PCC with a high symptom burden, especially if antibody levels after COVID-19 vaccination are low.