RT Journal Article SR Electronic T1 Effectiveness of alternative strategies to define index case phenotypes to aid genetic diagnosis of familial hypercholesterolaemia JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 175 OP 180 DO 10.1136/heartjnl-2012-302917 VO 99 IS 3 A1 Clarke, Rosemary E J A1 Padayachee, Soundrie T A1 Preston, Rebecca A1 McMahon, Zofia A1 Gordon, Mitchell A1 Graham, Colin A1 Crook, Martin A A1 Wierzbicki, Anthony S YR 2013 UL http://heart.bmj.com/content/99/3/175.abstract AB Objective To determine the utility of secondary stratification measures to improve the ascertainment of index cases of familial hypercholesterolaemia (FH). Design A retrospective study of genotyped index patients with Simon Broome (SB) FH. Setting University teaching hospital. Patients 204 patients aged 55±14 years; 36% had tendon xanthoma (TX), 21% had coronary heart disease (CHD), low-density lipoprotein cholesterol (LDL-C) was 6.20±2.24 mmol/l and 55% had genetic FH. Interventions The effects of different staging systems (SB vs Dutch criteria), presence of TX, use of LDL-C level, personal history of CHD and imaging evidence of atheroma by carotid intima-media thickness or coronary artery calcium score to identify genetic FH was explored. Outcome measures Changes in C-statistic and net reclassification index (NRI). Results SB criteria gave a C-statistic of 0.64 comprising C=0.65 in TX(+) and C=0.5 in TX(−) patients. Genetic FH was present in 75% of TX(+) compared with 44% in TX(−) patients. The Dutch criteria gave C=0.72. Addition of imaging criteria to prior CHD raised C=0.64 to C=0.65 in all patients with a NRI of 19% (p=0.06). In TX(−) patients imaging raised C=0.50 to C=0.65 with a NRI of 0.38 (p=0.001) and a weighted comparison index of 0.28, implying the detection of 14 more FH cases per thousand. Conclusions Patients with tendon xanthoma (definite FH) should be genotyped. In patients with possible FH, the presence of a personal history of CHD or imaging evidence of increased atheroma offers the best method of identifying index patients likely to have monogenic FH.