Cardiovascular medicine
Socioeconomic differentials in recurrent ischaemia and mortality
after acute myocardial infarction
K Barakata, S Stevensonb, P Wilkinsonb, A Sulimanc, K Ranjadayalanc, A D Timmisa
a Department of
Cardiology, Barts and The London NHS Trust (London Chest Hospital),
Bonner Road, London E2 9JX, UK, b Environmental Epidemiology Unit, London
School of Hygiene and Tropical Medicine, London, c Newham Healthcare Trust,
London
Correspondence to: Dr Timmis adam{at}timmis-lch.demon.co.uk
Accepted 19 December
2000
OBJECTIVE
To examine the influence of
socioeconomic deprivation on case fatality following acute myocardial infarction.
DESIGN
Prospective cohort
observational study.
SETTING
General hospital.
PATIENTS
1417 white and south Asian
patients admitted with acute myocardial infarction between January 1988 and December 1996, and classified by the Carstairs socioeconomic
deprivation score of the enumeration district of residence.
MAIN OUTCOME MEASURES
30 day and one
year survival.
RESULTS
There was little variation
across deprivation groups in age, sex, or smoking status, though a
higher proportion of patients from more deprived enumeration districts
were diabetic and of south Asian origin, and a higher proportion of
them developed Q wave infarction and left ventricular failure. There
was no appreciable variation in clinical treatment with deprivation.
Patients from more deprived enumeration districts had a higher risk of
recurrent ischaemic events (death, recurrent myocardial infarction, or
unstable angina) over the first 30 days: event free survival (95%
confidence interval (CI)) of the most deprived quartile was 0.79 (95%
CI 0.74 to 0.83) compared with 0.85 (95% CI 0.80 to 0.88) in the least
deprived quartile. The unadjusted hazard ratio corresponding to an
increase from the 5th to 95th centile of the deprivation distribution
was 1.54 (95% CI 1.02 to 2.32), and 1.59 (95% CI 1.03 to 2.44) after
adjustment for age, sex, racial group, diabetes, acute treatment with
thrombolysis and aspirin, and left ventricular failure. Survival from
30 days to one year, however, did not show a socioeconomic gradient
(hazard ratio adjusted for the same variables was 1.07 (95% CI
0.68 to 1.70)).
CONCLUSIONS
In patients hospitalised
with acute myocardial infarction, there is a strong association between
early recurrent ischaemic events and socioeconomic deprivation that is
not accounted for by clinical presentation or treatment. This
association appears to be attenuated over time.
Keywords: acute myocardial infarction; socieconomic deprivation; survival
© 2001 by Heart
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