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Risk factors help predict outcomes for children with rare heart condition
Date:9/3/2013

A long-term study of children with a complex heart condition called hypertrophic cardiomyopathy (HCM) found that the risk of death or need for immediate listing for heart transplantation was greatest for those who developed this disease as infants with congestive heart failure and for children who also had selective inborn errors of metabolism, a group of rare genetic disorders in which one or more of the body's key metabolic processes are disrupted.

The findings will be published online Tuesday in The Lancet to coincide with a presentation at the European Society of Cardiology Congress 2013 meeting in Amsterdam. The National Heart, Lung, and Blood Institute (NHLBI) and the Children's Cardiomyopathy Foundation supported this research.

Hypertrophic cardiomyopathy, a type of pediatric cardiomyopathy (diseases of the heart muscle) with varied causes and outcomes, is characterized by increased thickness (hypertrophy) of the heart wall.

HCM is rare, with fewer than one out of 100,000 children (ages birth to 18 years old) diagnosed annually in the United States. The condition is more frequently diagnosed in infants (under the age of one year), with 2 to 3 out of every 100,000 identified each year.

Researchers from the University of Miami Miller School of Medicine, along with colleagues from other institutions, sought to better understand how risk factors at the time of HCM diagnosis are predictors of death or the need to be added to a heart transplantation waiting list. They spent 19 years amassing data on more than 1,000 affected children at 98 pediatric cardiology centers in the U.S. and Canada through the NHLBI-funded Pediatric Cardiomyopathy Registry.

Researchers found that children with HCM caused by inborn errors of metabolism had the lowest rate of transplant-free survival within two years after diagnosis (43 percent). At two years after diagnosis, the rate of transplant-free survival was 55 percent for
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Contact: NHLBI Communications Office
nhlbi_news@nhlbi.nih.gov
301-496-4236
NIH/National Heart, Lung and Blood Institute
Source:Eurekalert

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