Identifying unmet clinical need in hypertrophic cardiomyopathy using national electronic health records
Fig 1
Defining cases of hypertrophic cardiomyopathy and non hypertrophic cardiomyopathy in national samples of structured electronic health records: phenotype algorithm using multiple ontologies (ICD-10, Read-2, OPCS-4, BNF).
[Fig note: The phenotype algorithm uses multiple ontologies: the International Classification of Disease version 10 (ICD-10), the Read classification system, the Office of Population Censuses and Surveys Classification of Intervention and Procedures (OPCS) and the British National Formulary (BNF). Grey shaded areas indicate how the algorithm was constructed for the definition of hypertrophic cardiomyopathy (HCM) in primary analysis. Record of symptoms, cardiologist care, cardiac arrhythmia, medication and/or surgery within +/-6 months of a recorded HCM diagnosis was considered evidence of supporting information of HCM. HA, hospital admissions; PC, primary care.].