Original investigation

Outcomes in a diabetic population of south Asians and whites following hospitalization for acute myocardial infarction: a retrospective cohort study

Aman PK Nijjar¹ , Hong Wang² , Kaberi Dasgupta³ , Doreen M Rabi⁴ , Hude Quan⁵ and Nadia A Khan¹

¹  Department of Medicine, University of British Columbia, BC, Canada

²  Center for Health Evaluation and Outcomes Sciences, University of British Columbia, BC, Canada

³  Department of Medicine, McGill University, Quebec, Canada

⁴  Departments of Medicine, Community Health and Cardiac Sciences, University of Calgary, AB, Canada

⁵  Department of Community Health Sciences, University of Calgary, AB, Canada

author email corresponding author email

Cardiovascular Diabetology 2010, 9:4doi:10.1186/1475-2840-9-4

Published:	22 January 2010

Abstract

Background

The aim of this study was to determine whether South Asian patients with diabetes have a worse prognosis following hospitalization for acute myocardial infarction (AMI) compared with their White counterparts. We measured the risk of developing a composite cardiovascular outcome of recurrent AMI, congestive heart failure (CHF) requiring hospitalization, or death, in these two groups.

Methods

Using hospital administrative data, we performed a retrospective cohort study of 41,615 patients with an incident AMI in British Columbia and the Calgary Health Region between April 1, 1995, and March 31, 2002. South Asian ethnicity was determined using validated surname analysis. Baseline demographic characteristics and co-morbidities were included in Cox proportional hazard models to compare time to reaching the composite outcome and its individual components.

Results

Among the AMI cohort, 29.7% of South Asian patients and 17.6% of White patients were identified as having diabetes (n = 7416). There was no significant difference in risk of developing the composite cardiovascular outcome (Hazard Ratio = 0.90, 95% CI = 0.80-1.01). However, South Asian patients had significantly lower mortality at long term follow-up (HR = 0.62, 95% CI = 0.51-0.74) compared to their White counterparts.

Conclusions

Following hospitalization for AMI, South Asian patients with diabetes do not have a significantly different long term risk of a composite cardiovascular outcome compared to White patients with diabetes. While previous research has suggested worse cardiovascular outcomes in the South Asian population, we found lower long-term mortality among South Asians with diabetes following AMI.