Successful weaning from continuous renal replacement therapy. Associated risk factors.

PURPOSE: To identify risk factors of successful continuous renal replacement therapy (CRRT) weaning and to evaluate the effect of furosemide in the recovery of urine output after CRRT stop.

MATERIALS AND

METHODS

Retrospective, observational study of critical patients treated with CRRT. Weaning tests (WT) were classified in two groups: successful (urine output was recovered and CRRT was not required again) and failed (CRRT was required again). A multiple logistic regression model was used to identify risk factors of successful CRRT WT. The prediction ability was assessed with the area under the receiver operating characteristic curves (AUC-ROC).

RESULTS

Eighty-six patients underwent 101 CRRT WT. The multivariate model identified that the risk factors of successful CRRT weaning were sex and 6h-urine output after CRRT stop. The AUC-ROC was 0.81 (0.72-0.90) for 6h-urine output before and 0.91 (0.84-0.96) for 6h-urine output after CRRT stop. The AUC-ROC for 6h-urine output after WT to predict successful CRRT weaning were 0.94 (0.88-1.0) in patients who received furosemide and 0.85 (0.72-0.99) in patients who did not.

CONCLUSIONS

Urine output after CRRT stop was the main risk factor of successful CRRT weaning. Administration of furosemide increased the strength of this association.