Letters

Risk in cardiovascular disease

BMJ 2000; 321 doi: https://doi.org/10.1136/bmj.321.7254.174 (Published 15 July 2000) Cite this as: BMJ 2000;321:174

Merit of using risk reduction rather than absolute risk for lipid lowering drugs

  1. Richard Neary, consultant in chemical neurology (nearrh@netscape.net),
  2. Sud Ramachandran, senior registrar in chemical neurology
  1. North Staffordshire Hospital Trust, North Staffordshire Hospital, Stoke-on-Trent ST4 6QG
  2. Department of Medicine, Manchester Royal Infirmary, University of Manchester, Manchester M13 9WL
  3. Fountain Medical Centre, Morley, Leeds LS27 9EN
  4. Bemerton Heath Surgery, Salisbury SP2 9DJ
  5. 152 Harley Street, London W1NN 1HH

    EDITOR—Our study of whether treatment recommendations for lipid lowering drugs should be based on absolute coronary risk or risk reduction1 was accompanied by an editorial by Jackson in the same issue that warrants further discussion.

    The chance of preventing a coronary event is the absolute risk multiplied by the relative risk reduction, but the question is whether the relative risk reduction is equal in patients of all ages. The meta-analysis of the statin trials by LaRosa et al,2 cited as evidence for this by Jackson (together with three hypertension trials), does not render Law et al's meta-analysis of lipid lowering trials invalid3 as LaRosa et al included both primary and secondary prevention trials, assuming that the difference between them relates only to the absolute risk of a further event.

    Our study concerned primary prevention, and the two relevant statin trials in this meta-analysis suggest that age may influence risk reduction, although formal statistical analyses were not reported. One of these trials showed a relative risk reduction of 40% (95% confidence interval 16% to 56%) below the age of 55, compared with 27% (8% to 43%) above4; the other study showed a 46.5% risk reduction below the median age (age 58) compared with 30.4% above.5 Both trials were consistent with the age effect predicted by Law et al's meta-analysis.

    Our objective was to highlight the potential for leaving young patients with multiple risk factors untreated by assuming that relative risk reduction is not influenced by age. If treatment is based solely on absolute risk a male, non-smoking, diabetic patient with systolic blood pressure of 180 mm Hg and total and high density lipoprotein cholesterol concentrations of 6.0 and 0.9 mmol/l would not reach the risk threshold for treatment until the age of 53. By contrast, …

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