Early Acute Kidney Injury Clinical Trial
Official title:
Neutrophil Gelatinase-Associated Lipocalin(NGAL): Early Biomarker of Acute Kidney Injury After Cardiac Surgery
The following objectives were used for comparison: 1)primary objective: Evaluate the urinary excretion of NGAL as a marker of early development of acute kidney injury in patients undergoing cardiac surgery.
All patients aged greater than 18 years undergoing elective cardiac surgery for coronary
artery bypass grafting and / or valve replacement, in need of cardiopulmonary bypass and
with the prospect of minimum hospital length stay of 48 hours in ICU, will be candidates for
participation in this study.
Criteria for exclusion Patients with IRA before hospitalization in the ICU; Patients with
estimated glomerular filtration (MDRD formula simplified) less than 30 ml / min; Patients
transplanted kidney; Patients with chronic renal failure on dialysis; Patients anuric the
admission in the ICU; Refusal to participate in the study.
Definition of IRA:
IRA will be defined according to the new proposal of AKIN (Acute Kidney Injury Network)
(awaiting publication): abrupt elevation (48 hours) of serum creatinine in value greater
than or equal to 0.3 mg / dL or an increase of 50% compared to baseline or reduction of
urinary volume to 0.5 ml / kg / h for more than 6 hours (Annex 1).
Laboratory Investigations Samples of urine will be collected before surgery, after 2, 4, 6,
12, 24, 48, 72 and 96 hours after the end of the CEC for determination of creatinine and
urinary NGAL (normalization of NGAL for excretion urinary creatinine).
The serum creatinine is measured before surgery and daily during the first 4 days after
surgery for the diagnosis of IRA. If the time of CEC exceed 2 hours, the first sample of
urine after the end of the CEC will be considered as "sample 2 hours".
Quantification of NGAL Samples of urine will be centrifuged (5 min at 2000 rpm) and frozen
at -20 ° C for later determination of NGAL by method of ELISA (Kit commercial AntybodyShop,
Denmark).
;
Time Perspective: Prospective