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Severe acute kidney injury associated with progression of chronic kidney disease after critical COVID-19
Critical Care volume 25, Article number: 37 (2021)
Corona virus disease 2019 (COVID-19) is associated with acute kidney injury (AKI) in patients that require critical care . As we have previously reported, the association between clinical AKI and biomarkers was not strong, perhaps indicating less renal tissue damage . Further, the preceding illness with high fever and restrictive fluid treatment in intensive care (ICU) may cause AKI through dehydration . The mechanisms of AKI in COVID-19 may include direct viral injury . However, urinary viral load in this cohort was low even in patients with severe AKI . This study reports the prevalence of chronic kidney failure (CKD) three to 6 months after discharge in a cohort COVID-19 ICU patients. A total of 122 patients were included during their ICU stay. We excluded 3 who did not have COVID-19, 33 who died, and 26 who declined follow-up or did not have creatinine analysis. This left 60 patients analysed in the present study.
Baseline creatinine and eGFR were extracted from the medical records from the preceding year and used for CKD definition. AKI during the ICU-stay was defined according to KDIGO-criteria . Kidney function at follow-up was estimated from plasma creatinine.
Data are expressed as mean ± standard deviation, median (IQR) or number of patients (%). Statistical differences were tested using Student’s t test, Wilcoxon’s Rank Sum Test or Chi-square-test as appropriate. p < 0.05 was considered significant.
Before COVID-19 onset only six patients had CKD stage 3 or higher (Table 1). During intensive care 27 (45%) patients did not develop AKI, 19 (31%) developed stage 1, 6 (10%) stage 2, and 8 (13%) stage 3. Patients had higher maximal creatinine (p = 3.5*10–15) based on the level of AKI. This was driven by a significant increase in creatinine from baseline (p = 1.4*10–8), that was expectedly more pronounced with increasing AKI stage (p = 2.3*10–9). The increase tended to normalise at follow-up, but creatinine remained higher in patients with stage 3 AKI than those who never developed AKI during the ICU-stay (Fig. 1).
Average follow-up time was 18 ± 3 weeks after discharge (range 10 to 26 weeks). Ten patients progressed to a higher CKD stage at follow-up than before contracting COVID-19. Patients with KDIGO stage 3 were more likely to progress to a higher CKD stage (Odds ratio 4.9[1.4–31], p = 0.009). Acute kidney disease (AKD) defined as AKI lasting for more than 7 days was associated with progression of CKD (Odds ratio 3.9[1.2–21], p = 0.018). There were no other statistical differences between patients who showed CKD progression compared to those that did not with regards to basic demographics, comorbid disease or ICU admission characteristics (Table 1). It should be noted that sarcopenia after critical care would tend to lower creatinine and may lead to over estimation of GFR, and therefore the number of patients with CKD progression may be higher than estimated in this dataset.
The main strength of this study is its comprehensive characterisation of clinical parameters during intensive care as well as comorbid disease. The main limitations of the present dataset are the use of a CKD definition at baseline that depends on creatinine only, a relatively low number of patients leading to few endpoints, and loss to follow-up of 25% of patients without convalescent creatinine.
In conclusion, critical COVID-19 goes with progression of chronic kidney disease in a substantial number of patients. Progression in CKD grade was associated with AKD defined as more than 7 days of AKI, and with KDIGO stage 3 AKI during intensive care.
Availability of data and materials
The datasets in the current study is available from the corresponding author on reasonable request.
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The authors thank research nurses Joanna Wessbergh and Elin Söderman, and the biobank assistants Erik Danielsson and Philip Karlsson for their expertise in compiling the study.
Open Access funding provided by Uppsala University. The study was funded by the SciLifeLab/KAW national COVID-19 research program Project Grant to MH (KAW 2020.0182), Swedish Society of Medicine to MH (SLS-938101), and the Swedish Research Council to RF (2014-02569 and 2014-07606).
Ethics approval and consent to participate
The presented data is part of a study approved by the National Ethical Review Agency (EPM; No. 2020-01623 and No. 2020-0362). Informed consent was obtained from the patient, or next of kin if the patient was unable to give consent during the ICU-stay, all included patients gave consent to participate in the follow-up study. The study was registered à priori (clinicaltrials.gov: https://clinicaltrials.gov/ct2/show/NCT04474249).
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All authors declare that they have no competing interests.
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Hultström, M., Lipcsey, M., Wallin, E. et al. Severe acute kidney injury associated with progression of chronic kidney disease after critical COVID-19. Crit Care 25, 37 (2021). https://doi.org/10.1186/s13054-021-03461-4