Hippisley-Cox J, Coupland C. Individualising the risks of statins in men and women in England and Wales: population-based cohort study. Heart 2010 Jun;96(12):939-947.
PMID: 20489220
DOI:10.1136/hrt.2010.199034
http://heart.bmj.com/content/96/12/939.abstract
http://heart.bmj.com/content/96/12/939.long
http://heart.bmj.com/content/96/12/939.full.pdf
++++
related:
Hippisley-Cox J, Coupland C. Unintended effects of statins in men and women in England and Wales: population based cohort study using the QResearch database. BMJ 2010 May 20;340:c2197.
editorial/secondary
Alsheikh-Ali AA, Karas RH. Balancing the intended and unintended effects of statins. BMJ 2010;340:c2240. (Editorial)
+++++
Heart. 2010 Jun;96(12):939-47. Epub 2010 May 20.
Individualising the risks of statins in men and women in England and Wales: population-based cohort study.
Hippisley-Cox J, Coupland C.
Division of Primary Care, University Park, Nottingham, UK. julia.hippisley-cox@nltworld.com
Abstract
OBJECTIVE: To derive and validate risk algorithms so that the risks of four clinical outcomes associated with statin use can be estimated for individual patients. DESIGN: Prospective open cohort study using routinely collected data from 368 QResearch general practices in England and Wales to develop the scores. The scores were validated using two separate sets of practices-188 separate QResearch practices and 364 practices contributing to the THIN database. SUBJECTS: In the QResearch derivation cohort 225 922 new users of statins and 1 778 770 non-users of statins were studied. In the QResearch validation cohort 118 372 statin users and 877 812 non-users of statins were studied. In the THIN validation cohort, we studied 282 056 statin users and 1 923 840 non-users of statins were studied. METHODS: Cox proportional hazards models in the derivation cohort to derive risk equations. Measures of calibration and discrimination in both validation cohorts. OUTCOMES: 5-Year risk of moderate/serious myopathic events; moderate/serious liver dysfunction; acute renal failure and cataract. RESULTS: The performance of three of the risk prediction algorithms in the THIN cohort was very good. For example, in women, the algorithm for moderate/serious myopathy explained 42.15% of the variation. The corresponding D statistics was 1.75. The acute renal failure algorithm explained 59.62% of the variation (D statistic=2.49). The cataract algorithm explained 59.14% of the variation (D statistic=2.46). The algorithms to predict moderate/severe liver dysfunction only explained 15.55% of the variation (D statistics=0.89). The performance of each algorithm was similar for both sexes when tested on the QResearch validation cohort. CONCLUSIONS: The algorithms to predict acute renal failure, moderate/serious myopathy and cataract could be used to identify patients at increased risk of these adverse effects enabling patients to be monitored more closely. Further research is needed to develop a better algorithm to predict liver dysfunction.
PMID: 20489220