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Risk of ischemic stroke after an acute myocardial infarction in patients with diabetes mellitus
Umeå University, Faculty of Medicine, Department of Public Health and Clinical Medicine, Medicine. (Östersund Research Unit)
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2014 (English)In: Circulation. Cardiovascular Quality and Outcomes, ISSN 1941-7713, E-ISSN 1941-7705, Vol. 7, no 1, 95-101 p.Article in journal (Refereed) Published
Abstract [en]

Background Incidence, any trend over time, and predictors of ischemic stroke after an acute myocardial infarction (AMI) in diabetic patients are unknown.

Methods and Results Data for 173 233 unselected patients with an AMI, including 33 503 patients with diabetes mellitus, were taken from the Swedish Register of Information and Knowledge about Swedish Heart Intensive Care Admissions (RIKS-HIA) during 1998 to 2008. Ischemic stroke events were recorded during 1 year of follow-up. Patients with diabetes mellitus more often had a history of cardiovascular disease, received less reperfusion therapy, and were treated with acetylsalicylic acid, P2Y12 inhibitors, and statins to a lesser extent compared with patients without diabetes mellitus. However, the use of evidence-based therapies increased markedly in both groups during the study period. The incidence of ischemic stroke during the first year after AMI decreased from 7.1% to 4.7% in patients with diabetes mellitus and from 4.2% to 3.7% in patients without diabetes mellitus. Risk reduction was significantly larger in the diabetic subgroup. Reperfusion therapy, acetylsalicylic acid, P2Y12 inhibitors, and statins were independently associated with the reduced stroke risk.

Conclusions Ischemic stroke is a fairly common complication after an AMI in patients with diabetes mellitus, but the risk of stroke has decreased during recent years. The increased use of evidence-based therapies contributes importantly to this risk reduction, but there is still room for improvement.

Place, publisher, year, edition, pages
2014. Vol. 7, no 1, 95-101 p.
National Category
Family Medicine
Identifiers
URN: urn:nbn:se:umu:diva-87182DOI: 10.1161/CIRCOUTCOMES.113.000311ISI: 000331071200014OAI: oai:DiVA.org:umu-87182DiVA: diva2:707786
Available from: 2014-03-25 Created: 2014-03-24 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Cardiovascular disease and diabetes or renal insufficiency: the risk of ischemic stroke and risk factor intervention
Open this publication in new window or tab >>Cardiovascular disease and diabetes or renal insufficiency: the risk of ischemic stroke and risk factor intervention
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background

In patients with diabetes mellitus (DM) or chronic kidney disease (CKD), established cardiovascular disease (CVD) is associated with an increased risk of recurrent events and poor outcome. Ischemic stroke after an acute myocardial infarction (AMI) is a devastating event that carries high risks of decreased patient independence and death. Among patients with DM or CKD, the risk of an ischemic stroke within a year following an AMI is not known. Improved risk factor control is required to reduce the likelihood of CVD recurrence. Guidelines recommend target lipid profile and blood pressure values; however, data show that these targets are often not met. Therefore, there remains an urgent need for improved cardiovascular secondary preventive follow- up.

Aims

The aims of the present studies were to define trends in the incidence and predictors of ischemic stroke after an AMI in patients with DM or CKD. Furthermore to assess whether secondary preventive follow-up with nurse-based telephone follow-up including medication titration after CVD improves risk factor values in patients with DM or CKD and to investigate if this method performs better than usual care to implement a new treatment guideline in diabetic patients.

Methods

To assess the risk of post-AMI ischemic stroke, patient data were obtained from the Swedish Register of Information and Knowledge about Swedish Heart Intensive Care Admissions (RIKS-HIA). In separate studies, we compared a total of 173 233 AMI patients with and without DM, and 118 434 AMI patients with and without CKD.

Within the nurse-based age-independent intervention to limit evolution of disease (NAILED) trial, we investigated a nurse-based cardiovascular secondary preventive follow-up protocol. Patients with acute coronary syndrome, stroke, or transient ischemic attack were randomized to receive either nurse-based telephone follow-up (intervention) or usual care (control). Low-density lipoprotein (LDL-C) levels and blood pressure (BP) were measured at 1 month (baseline) and 12 months post- discharge. Intervention patients with above-target baseline values received medication titration to achieve treatment goals, while the measurements for control patients were forwarded to their general practitioners for assessment. We calculated the changes in LDL-C level and BP between baseline and 12 months post-discharge, and compared 

these changes between 225 intervention patients and 215 control patients with concurrent DM or CKD. During the course of the NAILED trial, new secondary preventive guidelines for DM patients were released, including a new LDL-C target value. To assess adherence to the new guidelines within the NAILED trial, we compared LDL-C levels in the 101 intervention patients and 100 control patients with DM.

Results

Ischemic stroke after AMI

The rates of ischemic stroke within one-year after admission for an AMI decreased over time, from 7.1% in 1998–2000 to 4.7% in 2007–2008 among DM patients, and from 4.2% to 3.7% during the same time periods for non-diabetic patients. Lower stroke risk was associated with percutaneous coronary intervention (PCI) and initiation of secondary preventive treatments in-hospital.

In-hospital ischemic stroke occurred in 2.3% of CKD patients and 1.2% of non-CKD patients, with no change in these incidences over time. The rates of one-year post- discharge ischemic stroke decreased between 2003–2004 and 2009–2010 from 4.1% to 2.5% among CKD patients, and from 2.0% to 1.3% among non-CKD patients. Lower rates of post-discharge stroke were associated with PCI and statins.

Cardiovascular secondary preventive follow-up

Among DM and CKD patients with above-target baseline values in the NAILED trial, the median LDL-C value at 12 months was 2.2 versus 3.0 mmol/L (p<0.001) and median systolic BP was 140 versus 145 mmHg (p=0.26) for intervention and control patients, respectively.

Before the guideline change, 96% of the intervention and 70% of the control patients reached the target LDL-C value (p<0.001). After the guideline change, the corresponding respective proportions were 65% and 36% (p<0.001).

Conclusion

Ischemic stroke is a fairly common post-AMI complication among patients with DM and CKD. This risk of stroke has decreased during recent years, possibly due to the increased use of evidence-based therapies. Compared with usual care, cardiovascular secondary prevention including nurse-based telephone follow-up improved LDL-C values at 12 months after discharge in patients with DM or CVD, and led to more efficient implementation of new secondary preventive guidelines. 

Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2015. 55 p.
Series
Umeå University medical dissertations, ISSN 0346-6612 ; 1743
Keyword
cardiovascular disease, secondary prevention, diabetes mellitus, chronic kidney disease, acute coronary syndrome, stroke, randomized control trial
National Category
Cardiac and Cardiovascular Systems
Research subject
Medicine, cardiovascular disease
Identifiers
urn:nbn:se:umu:diva-109785 (URN)978-91-7601-320-5 (ISBN)
Public defence
2015-11-06, Hörsalen, Östersunds sjukhus, Östersund, 09:00 (Swedish)
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Supervisors
Available from: 2015-10-16 Created: 2015-10-06 Last updated: 2015-10-16Bibliographically approved

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