Research Article: Congestion, but not low cardiac output, is independently associated with acute kidney injury following contrast agent exposure
Abstract:
Contrast-associated acute kidney injury (CA-AKI) is frequently associated with adverse outcomes. Renal perfusion gradient is central to glomerular filtration. While renal vasoconstriction can partially compensate low-output-associated impairment of the renal perfusion gradient, venous congestion cannot be compensated. We hypothesized that congestion is a stronger predictor of CA-AKI than low output in cardiovascular diseases.
An all-comer single-center cohort of 3,126 cases undergoing coronary angiography with simultaneous right heart catheterization was analyzed. Patients were divided into four categories: congested [right atrial pressure (RAP) >10?mmHg and cardiac index (CI) >=2.2?L/min/m 2 ], low output (RAP?<=?10?mmHg and CI: <2.2?L/min/m 2 ), combined (RAP?>?10?mmHg and CI <2.2?L/min/m 2 ), and control (CI?>=?2.2?L/min/m 2 and RAP?<=?10?mmHg). The average age of patients was 74 years. CA-AKI occurred in 19% of patients overall. The incidence was highest among patients with congestion, who showed a significantly greater risk compared to controls (24% vs. 15%; Hazard Ratio (HR): 1.49, p = 0.001), whereas low-output patients showed only a trend towards increased risk (20% vs. 15%; HR: 1.22, p = 0.059). In multivariate analysis including the MEHRAN Score, only congestion but not low output was independently associated with AKI (HR for 5?mmHg increase in RAP: 1.07, p =?0.034; HR for CI: 1.00, p =?0.936).
Venous congestion is independently associated with CA-AKI and is a stronger predictor of CA-AKI than low cardiac output.
Introduction:
Contrast-associated acute kidney injury (CA-AKI) is frequently associated with adverse outcomes. Renal perfusion gradient is central to glomerular filtration. While renal vasoconstriction can partially compensate low-output-associated impairment of the renal perfusion gradient, venous congestion cannot be compensated. We hypothesized that congestion is a stronger predictor of CA-AKI than low output in cardiovascular diseases.
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