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Ischemic Stroke Risk After Acute Coronary Syndrome

View Article: PubMed Central - PubMed

ABSTRACT

Background: Prior studies show an increased risk of ischemic stroke (IS) after myocardial infarction; however, there is limited evidence on long‐term risk and whether it is directly related to cardiac injury. We hypothesized that the risk of IS after acute coronary syndrome is significantly higher if there is evidence of cardiac injury, such as ST‐segment elevation myocardial infarction (STEMI) or non‐STEMI, than when there is no evidence of cardiac injury, such as in unstable angina.

Methods and results: Administrative claims data were obtained from all emergency department encounters and hospitalizations at California's nonfederal acute care hospitals between 2008 and 2011. Patients with STEMI, non‐STEMI, and unstable angina were identified using appropriate International Classification of Diseases, Ninth Revision, Clinical Modification codes. The primary outcome was IS during 2 years of follow‐up. Unadjusted and adjusted Cox proportional hazards models were used to determine the association between acute coronary syndrome subtype and IS risk. We identified 73 059 patients with a diagnosis of STEMI (n=26 427), non‐STEMI (n=39 833), or unstable angina (n=6819) during the study period. In the fully adjusted models that included potential confounders such as atrial fibrillation and congestive heart failure, the risk of IS was higher with STEMI (hazard ratio 4.17, 95% CI 3.00–5.83; P<0.001) and non‐STEMI (hazard ratio 3.73, 95% CI 2.68–5.19, P<0.001) compared with unstable angina.

Conclusions: Non‐STEMI and STEMI confer an equally increased risk of IS. Studies exploring IS mechanisms in cardiac patients are needed to improve and tailor stroke prevention strategies.

No MeSH data available.


Related in: MedlinePlus

A, Hazard ratios of ischemic stroke as a function of time after NT (A) and as a function of time after ST (B). LCL, lower confidence level; NT, non–ST‐segment elevation myocardial infarction; ST, ST‐segment elevation myocardial infarction; UCL, upper confidence level.
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jah31594-fig-0003: A, Hazard ratios of ischemic stroke as a function of time after NT (A) and as a function of time after ST (B). LCL, lower confidence level; NT, non–ST‐segment elevation myocardial infarction; ST, ST‐segment elevation myocardial infarction; UCL, upper confidence level.

Mentions: There was a time‐dependent decrease in the risk of IS after STEMI and NSTEMI. In fully adjusted models, for patients with STEMI, the HR for IS dropped from 3.68 at 1 month to 0.93 at 12 months after the event. Similarly, in fully adjusted models, there was a drop in the HR of IS after NSTEMI from 3.34 at 1 month to 0.99 at 12 months following the event (Figure 3). The elevated risk of IS after STEMI or NSTEMI was during the first 6 months after the event.


Ischemic Stroke Risk After Acute Coronary Syndrome
A, Hazard ratios of ischemic stroke as a function of time after NT (A) and as a function of time after ST (B). LCL, lower confidence level; NT, non–ST‐segment elevation myocardial infarction; ST, ST‐segment elevation myocardial infarction; UCL, upper confidence level.
© Copyright Policy - creativeCommonsBy-nc-nd
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5015356&req=5

jah31594-fig-0003: A, Hazard ratios of ischemic stroke as a function of time after NT (A) and as a function of time after ST (B). LCL, lower confidence level; NT, non–ST‐segment elevation myocardial infarction; ST, ST‐segment elevation myocardial infarction; UCL, upper confidence level.
Mentions: There was a time‐dependent decrease in the risk of IS after STEMI and NSTEMI. In fully adjusted models, for patients with STEMI, the HR for IS dropped from 3.68 at 1 month to 0.93 at 12 months after the event. Similarly, in fully adjusted models, there was a drop in the HR of IS after NSTEMI from 3.34 at 1 month to 0.99 at 12 months following the event (Figure 3). The elevated risk of IS after STEMI or NSTEMI was during the first 6 months after the event.

View Article: PubMed Central - PubMed

ABSTRACT

Background: Prior studies show an increased risk of ischemic stroke (IS) after myocardial infarction; however, there is limited evidence on long‐term risk and whether it is directly related to cardiac injury. We hypothesized that the risk of IS after acute coronary syndrome is significantly higher if there is evidence of cardiac injury, such as ST‐segment elevation myocardial infarction (STEMI) or non‐STEMI, than when there is no evidence of cardiac injury, such as in unstable angina.

Methods and results: Administrative claims data were obtained from all emergency department encounters and hospitalizations at California's nonfederal acute care hospitals between 2008 and 2011. Patients with STEMI, non‐STEMI, and unstable angina were identified using appropriate International Classification of Diseases, Ninth Revision, Clinical Modification codes. The primary outcome was IS during 2 years of follow‐up. Unadjusted and adjusted Cox proportional hazards models were used to determine the association between acute coronary syndrome subtype and IS risk. We identified 73 059 patients with a diagnosis of STEMI (n=26 427), non‐STEMI (n=39 833), or unstable angina (n=6819) during the study period. In the fully adjusted models that included potential confounders such as atrial fibrillation and congestive heart failure, the risk of IS was higher with STEMI (hazard ratio 4.17, 95% CI 3.00–5.83; P<0.001) and non‐STEMI (hazard ratio 3.73, 95% CI 2.68–5.19, P<0.001) compared with unstable angina.

Conclusions: Non‐STEMI and STEMI confer an equally increased risk of IS. Studies exploring IS mechanisms in cardiac patients are needed to improve and tailor stroke prevention strategies.

No MeSH data available.


Related in: MedlinePlus