Profile of acute kidney injury after open heart surgeries in a tertiary care hospital.

Our objective is to determine the incidence, etiology, risk factors and outcome of acute kidney injury (AKI) after open heart surgery. A prospective study was conducted on 62 patients who underwent open heart surgery and were followed-up for the development of AKI and to determine its incidence, etiology and outcome. Post-operative AKI was considered when the post-operative serum creatinine was >1.5 mg/dL or there was doubling of serum creatinine above the baseline (pre-operative) with a prior normal renal function. The incidence of AKI in the post-operative period in our study was 17.7%. The common etiological factors for AKI in our study were sepsis, hypotension, prolonged need for ventilator and inotropic support and drugs given in the post-operative period. The important risk factors for the development of AKI in the post-operative period were hypertension, diabetes mellitus, gout, prolonged total bypass time and prolonged aortic cross-clamp time. The overall mortality in our study subjects was 11.3% (seven of 62 died) and the mortality in the patients who developed post-operative AKI was 71.4%.