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Lakhal, Karim; Bigot-Corbel, Edith; Sacchetto, Emilie; Chabrun, Floris; Senage, Thomas; Figueres, Lucile; Leroy, Maxime; Legrand, Arnaud; Rozec, Bertrand
BMC anesthesiology, 10/2021, Volume: 21, Issue: 1Journal Article
For the detection of cardiac surgery-associated acute kidney injury (CS-AKI), the performance of urine tissue inhibitor of metalloproteinase 2 insulin-like growth factor-binding protein 7 (TIMP2 IGFBP7) has never been compared with that of very early changes in plasma creatinine (∆pCr). We hypothesized that, in the context of perioperative haemodilution, lack of postoperative decrease in pCr would be of honourable performance for the detection of CS-AKI. We therefore aimed at comparing these biomarkers and their kinetics (primary objective). As secondary objectives, we assessed plasma neutrophil gelatinase-associated lipocalin (pNGAL), cystatin C (pCysC) and urea (pUrea). We also determined the ability of these biomarkers to early discriminate persistent from transient CS-AKI. Patients over 75 years-old undergoing aortic valve replacement with cardiopulmonary bypass (CPB) were included in this prospective observational study. Biomarkers were measured before/after CPB and at the sixth postoperative hour (H6). In 65 patients, CS-AKI occurred in 27 (42%). ∆pCr from post-CPB to H6 (∆pCr ): outperformed TIMP2 IGFBP7 at H6 and its intra- or postoperative changes: area under the receiver operating characteristic curve (AUC ) of 0.84 95%CI:0.73-0.92 vs. ≤0.67 95%CI:0.54-0.78, p ≤ 0.03. The AUC of pNGAL, pCysC and pUrea did not exceed 0.72 95%CI:0.59-0.83. Indexing biomarkers levels for blood or urine dilution did not improve their performance. Combining TIMP2 IGFBP7 and ∆pCr was of no evident added value over considering ∆pCr alone. For the early recognition of persistent CS-AKI, no biomarker outperformed ∆pCr (AUC = 0.69 95%CI:0.48-0.85). In this hypothesis-generating study mostly testing early detection of mild CS-AKI, there was no evident added value of the tested modern biomarkers over early minimal postoperative changes in pCr: despite the common perioperative hemodilution in the setting of cardiac surgery, if pCr failed to decline within the 6 h after CPB, the development of CS-AKI was likely. Confirmatory studies with more severe forms of CS-AKI are required.
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