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Systematic family screening for familial hypercholesterolemia in Iceland

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Authors
Thorsson, Bolli
Sigurdsson, Gunnar
Gudnason, Vilmundur
Issue Date
2003-02-01

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Citation
Arterioscler Thromb Vasc Biol. 2003, 23(2):335-8
Abstract
OBJECTIVE: This study compares a novel approach using systematic family screening for patients in Iceland who have familial hypercholesterolemia (FH) with conventional proband screening and assesses the sensitivity and specificity of diagnosing FH by cholesterol measurements compared with mutational testing of family members. METHODS AND RESULTS: Probands with the I4T+2C mutation were traced to common ancestors. A downtracing of each family lineage was performed back to the oldest living offspring (key individuals); these individuals were recruited for cholesterol measurement and mutation testing. The sensitivity and specificity of cholesterol measurements was assessed against mutational analysis. Eleven probands clustered into 4 families. There were 364 key individuals identified among their descendants. Eighty-four percent responded, and 11% were positive for the mutation. There were 78 offspring of the positive key individuals, and 40 of those were carriers. Compared with use of the conventional first-degree relative approach, an additional 19% of FH individuals, including key individuals and their descendants, were identified. As diagnostic criteria, cholesterol measurements in the families had 95% specificity and 94% sensitivity. CONCLUSIONS: Tracing FH probands to common ancestors and screening the oldest offspring in each family lineage adds considerably to the conventional method of FH screening (testing first-degree relatives). This may have relevance in other founder populations.
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http://atvb.ahajournals.org/cgi/content/abstract/23/2/335
ae974a485f413a2113503eed53cd6c53
10.1161/01.ATV.0000051874.51341.8C
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