Incidence, Determinants, and Outcome of Contrast-induced Acute Kidney Injury following Percutaneous Coronary Intervention at a Tertiary Care Hospital

Contrast-induced acute kidney injury (CI-AKI) after percutaneous coronary intervention (PCI) is the common cause of in-hospital acquired AKI and is associated with in-hospital mortality and prolonged hospital stay. We studied the incidence of CI-AKI after PCI, determinants of CI-AKI, and also assessed their length of hospital stay, in-hospital mortality, and need for dialysis. This was a hospital-based prospective observational study done on 204 adult subjects, who were candidates for PCI, at a tertiary care center in North India. Various clinical and biochemical parameters were monitored. Renal function was estimated at admission and 48 and 72 h after PCI. The incidence of CI-AKI post-PCI was 12.7%. Factors predicting the CI-AKI post-PCI on multiple logistic regression analysis are as follows: age >= 70 years, chronic kidney disease (CKD), hypotension, acute decompensated heart failure (ADHF), severe left ventricular systolic dysfunction (LVSD), and intra-aortic balloon pump (IABP) support. Contrast medium volume >= 200 mL and baseline estimated glomerular filtration rate <60 mL/min/1.73 m(2) were significantly found to increase the risk of CI-AKI. Patients developing CI-AKI had significantly longer duration of hospital stay (6.4 +/- 1.8 days vs. 3.1 +/- 0.9 days; P <0.001). 15.4% of CI-AKI patients needed dialysis. In-hospital mortality was significantly higher in patients with CI-AKI (P <0.001). CI-AKI is a common complication following PCI, especially if the patient is elderly, has impaired renal function, hypotension, ADHF, severe LVSD and requires IABP support. The incidence of CI-AKI increases with the increases in contrast volume above 200 mL. The development of CI-AKI leads to a longer duration of hospital stay and increases in-hospital mortality.