Outcomes in a diabetic population of South Asians and whites following hospitalization for acute myocardial infarction: a retrospective cohort study.
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.
Nijjar
Aman P K
AP
Department of Medicine, University of British Columbia, BC, Canada. apnijjar@gmail.com
Wang
Hong
H
Dasgupta
Kaberi
K
Rabi
Doreen M
DM
Quan
Hude
H
Khan
Nadia A
NA
D000368:Aged; D044466:Asian People / Q000706:statistics & numerical data; D015331:Cohort Studies; D003925:Diabetic Angiopathies / Q000401:mortality / Q000628:therapy*; D003928:Diabetic Nephropathies / Q000453:epidemiology; D005006:Ethnicity / Q000706:statistics & numerical data; D005260:Female; D006333:Heart Failure / Q000453:epidemiology; D006760:Hospitalization; D006801:Humans; D007182:Income; D008171:Lung Diseases / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000401:mortality / Q000628:therapy*; D012189:Retrospective Studies; D020521:Stroke / Q000453:epidemiology; D016896:Treatment Outcome; D044465:White People / Q000706:statistics & numerical data