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Open Access Highly Accessed Research article

Variations in cardiovascular disease under-diagnosis in England: national cross-sectional spatial analysis

Michael Soljak1*, Edgar Samarasundera1, Tejal Indulkar1, Hannah Walford2 and Azeem Majeed1

Author Affiliations

1 Department of Primary Care & Public Health, Imperial College London, 3rd Floor, Reynolds Building, Charing Cross Campus, St Dunstan's Road, London W6 8RP, UK

2 Eastern Region Public Health Observatory, IPH, University Forvie Site, Robinson Way, Cambridge, CB2 0SR, UK

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BMC Cardiovascular Disorders 2011, 11:12  doi:10.1186/1471-2261-11-12

Published: 17 March 2011

Abstract

Background

There is under-diagnosis of cardiovascular disease (CVD) in the English population, despite financial incentives to encourage general practices to register new cases. We compared the modelled (expected) and diagnosed (observed) prevalence of three cardiovascular conditions- coronary heart disease (CHD), hypertension and stroke- at local level, their geographical variation, and population and healthcare predictors which might influence diagnosis.

Methods

Cross-sectional observational study in all English local authorities (351) and general practices (8,372) comparing model-based expected prevalence with diagnosed prevalence on practice disease registers. Spatial analyses were used to identify geographic clusters and variation in regression relationships.

Results

A total of 9,682,176 patients were on practice CHD, stroke and transient ischaemic attack, and hypertension registers. There was wide spatial variation in observed: expected prevalence ratios for all three diseases, with less than five per cent of expected cases diagnosed in some areas. London and the surrounding area showed statistically significant discrepancies in observed: expected prevalence ratios, with observed prevalence much lower than the epidemiological models predicted. The addition of general practitioner supply as a variable yielded stronger regression results for all three conditions.

Conclusions

Despite almost universal access to free primary healthcare, there may be significant and highly variable under-diagnosis of CVD across England, which can be partially explained by persistent inequity in GP supply. Disease management studies should consider the possible impact of under-diagnosis on population health outcomes. Compared to classical regression modelling, spatial analytic techniques can provide additional information on risk factors for under-diagnosis, and can suggest where healthcare resources may be most needed.