JOURNAL ARTICLE
MULTICENTER STUDY
RESEARCH SUPPORT, NON-U.S. GOV'T
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Contrast-induced nephropathy in patients undergoing computed tomography (CONNECT) - a clinical problem in daily practice? A multicenter observational study.

Acta Radiologica 2010 September
BACKGROUND: Although several studies have examined contrast-induced nephropathy (CIN) following computed tomography (CT) procedures under closely controlled clinical trial conditions, less is known about the incidence of CIN (or its key predictive factors) in a "real world" clinical setting.

PURPOSE: A multicenter, observational registry study was undertaken in Italian hospital radiology departments to retrospectively assess the incidence of CIN in at-risk patients undergoing iodixanol-enhanced CT procedures.

MATERIAL AND METHODS: Each department used center-specific (nonstandardized) CT protocols. Data were available from 493 at-risk patients; most (76.4%) had 1 risk factor for CIN, 19.8% had 2, and 3.4% had 3. In all, 169 patients (34.3%) had reduced renal function (estimated glomerular filtration rate [eGFR] <60 ml/min/1.73m(2)). Prophylactic volume expansion was not used in 70.6% of the study population.

RESULTS: The overall incidence of CIN (defined as a > or =44.2 micromol/l [0.5 mg/dl] increase in serum creatinine from baseline 72 h postprocedure) was 2.6%; in the subpopulation of patients with renal impairment (with or without other risk factors), CIN incidence was 4.7%. Multivariate analysis identified renal insufficiency as the only risk factor predictive of CIN (relative risk, 3.850; 95% confidence interval, 1.200-12.348; P=0.023).

CONCLUSION: In the clinical setting of hospital CT radiology practice, where guideline-recommended strategies for CIN prevention may not be consistently followed, use of the iso-osmolar agent iodixanol appears to be associated with a low incidence of CIN in at-risk patients.

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