Intended for healthcare professionals

Letters Accuracy of recording acute myocardial infarction events

Unlinked data sources underestimate risk of cardiovascular disease

BMJ 2013; 346 doi: (Published 11 June 2013) Cite this as: BMJ 2013;346:f3737
  1. Richard J Stevens, university research lecturer in statistics1,
  2. Richard McManus, professor of primary care1
  1. 1Department of Primary Care Health Sciences, University of Oxford, Oxford OX2 6GG, UK
  1. richard.stevens{at}

Herrett and colleagues’ observation that a primary care database alone captured about 75% of all cases of acute myocardial infarction (fig 3) could have implications for every study that has used primary care databases to derive, or validate, clinical prediction rules for cardiovascular disease.1

For example, …

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