Ahmad Kaddourah1, Stuart L Goldstein1,2, Steven E Lipshultz3,4, James D Wilkinson3, Lynn A Sleeper5, Minmin Lu5, Steven D Colan6, Jeffrey A Towbin2, Scott I Aydin7, Joseph Rossano8, Melanie D Everitt9, Jeffrey G Gossett10, Paolo Rusconi4, Paul F Kantor11, Rakesh K Singh12, John L Jefferies13,14. 1. Center for Acute Care Nephrology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA. 2. The Heart Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave. ML 2003, Cincinnati, OH, 45229, USA. 3. Wayne State University School of Medicine and Children's Hospital of Michigan, Detroit, MI, USA. 4. University of Miami Miller School of Medicine, Miami, FL, USA. 5. New England Research Institutes, Watertown, MA, USA. 6. Boston Children's Hospital, Boston, MA, USA. 7. Montefiore Medical Center, New York City, NY, USA. 8. Children's Hospital of Philadelphia, Philadelphia, PA, USA. 9. Primary Children's Hospital, Salt Lake City, UT, USA. 10. Anne & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, USA. 11. Stollery Children's Hospital, Edmonton, Alberta, Canada. 12. Columbia University Medical Center, New York City, NY, USA. 13. Center for Acute Care Nephrology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA. john.jefferies@cchmc.org. 14. The Heart Institute, Cincinnati Children's Hospital Medical Center, 3333 Burnet Ave. ML 2003, Cincinnati, OH, 45229, USA. john.jefferies@cchmc.org.
Abstract
BACKGROUND: The association of cardiorenal syndrome (CRS) with mortality in children with dilated cardiomyopathy (DCM) is unknown. METHODS: With a modified Schwartz formula, we estimated glomerular filtration rates (eGFR) for children ≥1 year of age with DCM enrolled in the Pediatric Cardiomyopathy Registry at the time of DCM diagnosis and annually thereafter. CRS was defined as an eGFR of <90 mL/min/1.73 m(2). Children with and without CRS were compared on survival and serum creatinine concentrations (SCr). The association between eGFR and echocardiographic measures was assessed with linear mixed-effects regression models. RESULTS: Of 285 eligible children with DCM diagnosed at ≥1 year of age, 93 were evaluable. CRS was identified in 57 of these 93 children (61.3%). Mean (standard deviation) eGFR was 62.0 (22.6) mL/min/1.73 m(2) for children with CRS and 108.0 (14.0) for those without (P < 0.001); median SCr concentrations were 0.9 and 0.5 mg/dL, respectively (P < 0.001). The mortality hazard ratio of children with CRS versus those with no CRS was 2.4 (95% confidence interval 0.8-7.4). eGFR was positively correlated with measures of left ventricular function and negatively correlated with age. CONCLUSIONS: CRS in children newly diagnosed with DCM may be associated with higher 5-year mortality. Children with DCM, especially those with impaired left ventricular function, should be monitored for renal disease.
BACKGROUND: The association of cardiorenal syndrome (CRS) with mortality in children with dilated cardiomyopathy (DCM) is unknown. METHODS: With a modified Schwartz formula, we estimated glomerular filtration rates (eGFR) for children ≥1 year of age with DCM enrolled in the Pediatric Cardiomyopathy Registry at the time of DCM diagnosis and annually thereafter. CRS was defined as an eGFR of <90 mL/min/1.73 m(2). Children with and without CRS were compared on survival and serum creatinine concentrations (SCr). The association between eGFR and echocardiographic measures was assessed with linear mixed-effects regression models. RESULTS: Of 285 eligible children with DCM diagnosed at ≥1 year of age, 93 were evaluable. CRS was identified in 57 of these 93 children (61.3%). Mean (standard deviation) eGFR was 62.0 (22.6) mL/min/1.73 m(2) for children with CRS and 108.0 (14.0) for those without (P < 0.001); median SCr concentrations were 0.9 and 0.5 mg/dL, respectively (P < 0.001). The mortality hazard ratio of children with CRS versus those with no CRS was 2.4 (95% confidence interval 0.8-7.4). eGFR was positively correlated with measures of left ventricular function and negatively correlated with age. CONCLUSIONS:CRS in children newly diagnosed with DCM may be associated with higher 5-year mortality. Children with DCM, especially those with impaired left ventricular function, should be monitored for renal disease.
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