BackgroudRhabdomyolysis is a syndrome caused by the breakdown and necrosis of skeletal muscle tissues. As a result, there is leakage of various intercellular myocyte contents into the circulating blood stream. Severe rhabdomyolysis can lead to acute kidney injury (AKI) and cause potentially permanent kidney damage. Previous studies have reported benefit from continuous renal replacement therapy (CRRT) for rhabdomyolysis-associated AKI. For patients with AKI, the termination of CRRT often depends on the patient’s renal functions. Here, we asked whether serum creatine kinase (CK) levels should be considered for CRRT termination in patients with AKI following rhabdomyolysis.MethodsWe compared different CK levels in patients after CRRT termination and we observed the correlation between CK levels and clinical outcomes. For a retrospective study, we collected 86 cases with confirmed rhabdomyolysis-associated AKI, who had received CRRT from January 1st of 2012 to December 31th of 2020 in Tongji Hospital. Patients’ renal functions were assessed within 24 hours of intermission, and patients with urine output ≥ 1,000 mL and serum creatinine ≤ 265 umol/L were considered for CRRT termination. Following CRRT termination, patients were divided into a CK > 5,000 U/L group (experimental group) and a CK < 5,000 U/L group (control group). The outcomes, such as in-hospital mortality and in-hospital length of stay, were compared between two groups.ResultsThirty-three (38.37%) patients were classified as having CK > 5,000 U/L, while 53 (61.63%) were categorized as having CK < 5,000 U/L. The majority of laboratory examinations were comparable between the two groups on admission. The higher CK levels, as well as worse renal functions, predicted the necessity of CRRT continuation for patients. After CRRT termination, the in-hospital mortality (27.27% vs 22.64, p = 0.389) and Multiple Organ Dysfunction Syndrome (MODS) incidence (51.52% vs 49.06%, p = 0.064) were similar between two groups, while the experimental group showed a significantly shorter in-hospital length of stay (11.88 ± 1.469 vs 16.42 ± 1.290, p = 0.026) and Intensive Care Unit (ICU) length of stay (7.545 ± 0.866 vs 10.11 ± 0.793, p = 0.038).ConclusionCRRT termination may be independent of s the CK levels for patients with rhabdomyolysis-associated acute kidney injure, providing their renal functions have recovered to an appropriate level. Prospective clinical trials would be needed to more thoroughly investigate the optimal CK range that could be used as a gauge to prevent recurrence of renal impairments after treatments.