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Epidemiology/Health Services/Psychosocial Research

Prospective Study of Type 1 and Type 2 Diabetes and Risk of Stroke Subtypes

The Nurses’ Health Study

  1. Mohsen Janghorbani, PHD12,
  2. Frank B. Hu, MD23,
  3. Walter C. Willett, MD234,
  4. Tricia Y. Li, MD2,
  5. Joann E. Manson, MD345,
  6. Giancarlo Logroscino, MD3 and
  7. Kathryn M. Rexrode, MD45
  1. 1Department of Epidemiology and Biostatistics, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran
  2. 2Department of Nutrition, Harvard School of Public Health, Boston, Massachusetts
  3. 3Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts
  4. 4Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts
  5. 5Division of Preventive Medicine, Brigham and Women's Hospital, Boston, Massachusetts
  1. Address correspondence and reprint requests to Mohsen Janghorbani, Department of Epidemiology and Biostatistics, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran. E-mail: janghorbani{at}yahoo.com
Diabetes Care 2007 Jul; 30(7): 1730-1735. https://doi.org/10.2337/dc06-2363
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The Nurses’ Health Study

Abstract

OBJECTIVE— The aim of this study was to examine the relationship between type 1 and type 2 diabetes and risk of stroke subtypes in women.

RESEARCH DESIGN AND METHODS— We followed 116,316 women aged 30–55 years in 1976 through 2002 for incidence of stroke. At baseline and through biennial follow-up, women were asked about their history and treatment of diabetes and other potential risk factors for stroke.

RESULTS— During 2.87 million person-years of follow-up, 3,463 incident strokes occurred. In multivariate analyses, the incidence of total stroke was fourfold higher in women with type 1 diabetes (relative risk [RR] 4.7 [95% CI 3.3–6.6]) and twofold higher among women with type 2 diabetes (1.8 [1.7–2.0]) than for nondiabetic women. The multivariate RR of ischemic stroke was increased sixfold (6.3 [4.0–9.8]) in type 1 diabetes and twofold (2.3 [2.0–2.6]) in type 2 diabetes. Risks for large-artery infarction and lacunar stroke were similar. Type 1 diabetes was also significantly associated with the risk of hemorrhagic stroke (3.8 [1.2–11.8]), but type 2 diabetes was not (1.0 [0.7–1.4]).

CONCLUSIONS— Both type 1 and type 2 diabetes are associated with substantially increased risks of total and most subtypes of stroke.

  • CT, computed tomography
  • MRI, magnetic resonance imaging

In many (1–11) but not all (12–15) epidemiological studies, type 2 diabetes has been an important risk factor for ischemic stroke; however, relative risks (RRs) have varied widely, from 1.3 to 4.9 (1–11). The disparate RRs may be explained in part by differences in populations, definitions of diabetes, types of stroke studied, and analytical methods. The increased risk of stroke has been linked to the pathophysiological changes seen in the cerebral vessels of individuals with diabetes (1). In contrast, the association with hemorrhagic stroke remains controversial; reported associations have been positive (3,5), null (16,17), or even inverse (1,18–20). Further, only a few small studies have examined the risk of stroke in patients with type 1 diabetes (18–21), and this relationship remains unsettled. We used the large ongoing Nurses’ Health Study to examine the risk of total stroke and its subtypes in women with type 1 or type 2 diabetes.

RESEARCH DESIGN AND METHODS

Data collection

The Nurses’ Health Study is an ongoing cohort established in 1976 when 121,701 female registered nurses aged 30–55 years completed a mailed questionnaire on their health status and various lifestyle and behavioral risk factors. Participants complete biennial follow-up questionnaires to update risk factors and report newly diagnosed diseases including stroke. The biennial follow-up rate exceeds 90%, and mortality follow-up is estimated as >98% complete (22). The human research committees at the Harvard School of Public Health and Brigham and Women's Hospital approved the study.

Ascertainment of stroke

Incident strokes were defined as the first nonfatal stroke or stroke death occurring after the baseline questionnaire in 1976 but before 1 June 2002. Women who reported a stroke were asked for permission to access their medical records, which were reviewed by a physician without knowledge of the participant's exposure status. Women for whom medical record release was refused or for whom medical records were unavailable were classified as probable if supporting information was provided. Cerebrovascular pathology due to infection, trauma, or malignancy was excluded, as were “silent” strokes discovered only by radiological imaging. Stroke was classified according to criteria established by the National Survey of Stroke (23), which required evidence of a neurological deficit with sudden or rapid onset that persisted for >24 h or until death. Strokes were classified as follows: ischemic stroke (thrombotic or embolic strokes), hemorrhagic stroke (subarachnoid or intraparenchymal hemorrhage), or stroke of unknown subtype. For each type of stroke, a definite diagnosis was made when a CT scan, MRI, angiography, surgery, or autopsy confirmed the lesion; otherwise a probable diagnosis was made. CT or MRI reports were available for 89% of those with medical records.

As described previously (24), thrombotic strokes were further classified as a large-artery occlusive infarction, lacunar infarction, or unclassified thrombotic infarction on the basis of CT scans, MRI, or autopsy, according to the criteria of the Perth Community Stroke Study (25). Interrater agreement of stroke subtypes in our cohort is high (24).

During 24 years of follow-up, 2,719 cases of a first nonfatal stroke were identified: 1,899 (69.8%) were confirmed by medical record review, and 820 (30.2%) were classified as probable, with 332 corroborated by letter and 488 by telephone. Stroke deaths were detected through information provided by the next of kin or postal authorities or by systematic searches of the National Death Index and documented by medical records and death certificates. Classification of fatal stroke was confirmed by review of hospital records, autopsy, or death certificate. If information was limited to death certificate or that provided by next of kin and no medical records were available, cases were classified as probable. Of 744 fatal strokes, 455 (61.2%) were confirmed by medical records and 289 (38.8%) were classified as probable, with 255 corroborated by telephone information provided by next of kin and 34 solely by death certificate. Of 3,463 total strokes, 2,354 (68%) were confirmed on the basis of medical records and 1,109 (32%) were classified as probable on the basis of supporting information. Results were comparable for the confirmed and probable cases; thus, confirmed and probable cases were combined for total stroke analyses. For analysis of specific stroke subtypes, only confirmed cases were included.

Ascertainment of diabetes

Cases of diabetes were identified from baseline and biennial follow-up questionnaires. When women reported a diagnosis of diabetes, a supplementary questionnaire was sent to ascertain diagnostic tests, treatments, and complications. Confirmation criteria conformed to guidelines of the National Diabetes Data Group (26) until 1997, when the revised criteria of the American Diabetes Association were implemented (27). In a substudy, 98.4% of our nurse participants’ reports of type 2 diabetes were confirmed by medical records (28). Only women with definite type 1 or type 2 diabetes, based on the supplementary questionnaire, were considered in this analysis. We estimated duration of clinical diabetes by subtracting the date of diagnosis from the date of last completed questionnaire. Using the baseline questionnaire, we classified women as having type 1 diabetes if diabetes was first diagnosed at ≤30 years of age or they were currently using insulin and were ketosis prone (n = 303). Women in whom diabetes was first diagnosed at 30 years of age were classified as having type 2 diabetes (n = 10,766); 9,416 of these cases of diabetes were diagnosed during follow-up after 1976.

Covariates

Information on age, body weight, smoking status, weight change, aspirin use, alcohol intake, diet, lifestyle, family and personal medical history, and postmenopausal hormone therapy was collected at baseline or through the biennial questionnaires. We calculated BMI as the ratio of weight (in kilograms) to the square of height (in meters) (29). Waist and hip circumferences were self-reported in 1986 and 1996 (30), and physical activity was assessed in 1986, 1988, 1992, 1994, 1996, 1998, and 2000 (31). History of hypertension and hypercholesterolemia was self-reported with high validity (32).

We excluded from analysis women who reported type 2 diabetes that was not confirmed, whose date of diagnosis of diabetes was missing, or who reported diabetes onset at age <30 years but who were not taking insulin (n = 1,952) and whose date of birth was missing (n = 123), who died shortly after agreeing to participate in the study (n = 3), or who at baseline reported having cancer (n = 3,285) or stroke (n = 22). We thus included 116,316 women with a mean ± SD age of 54.0 ± 10.2 years.

Statistical analysis

We calculated incidence rates (cases of stroke per 100,000 person-years) from completion of the baseline questionnaire until the occurrence of stroke, date of the last completed questionnaire, death, or 1 June 2002, whichever came first. We estimated RRs using incidence rates (age adjusted), and hazard ratios (multivariate) from the Cox proportional hazards model with the SAS computer package (version 9.0; SAS Institute, Cary, NC). We considered as covariates BMI, menopausal status and use of postmenopausal hormones, smoking, physical activity, history of hypertension and hypercholesterolemia, ischemic heart disease that occurred during the follow-up, and use of aspirin and alcohol. To clarify the role of hypertension further, we also included the interaction terms of hypertension with type 2 diabetes in the “full” model. All tests for statistical significance were two tailed and performed at α < 0.05.

RESULTS

Our analysis included 105,247 (90.5%) women without diabetes, 303 (0.3%) with type 1 diabetes, and 10,766 (9.2%) with type 2 diabetes. Women with type 2 diabetes were older, had higher current BMI, BMI at age 18, and weight gain, and were less likely to drink alcohol than those without diabetes (Table 1). Women with either type of diabetes were more likely to have hypertension, hypercholesterolemia, and ischemic heart disease. The mean ± SD age of stroke was 67.8 ± 8.3 years for nondiabetic women, 63.4 ± 8.0 years for type 1 diabetic women, and 67.6 ± 7.3 years for type 2 diabetic women.

During 2.87 million person-years of follow-up, 3,463 (3.0%) incident cases of first stroke occurred, of which 744 were fatal. The overall incidence of stroke was 106 (95% CI 103–110) per 100,000 person-years. Of the 303 women who had type 1 diabetes, 33 subsequently had a stroke (475/100,000 person-years), an incidence higher than that for women with type 2 diabetes (240/100,000 person-years) (Table 2).

The risk of total stroke was sixfold higher in women with type 1 (RR 5.9 [95% CI 4.2–8.3]) and twofold higher among women with type 2 diabetes (2.3 [2.1–2.6]) than for nondiabetic women in age-adjusted models. The age-adjusted RR of thrombotic stroke was eightfold higher (8.0 [4.9–13.1]) in type 1 and threefold higher (3.2 [2.8–3.6]) in type 2 diabetes. Type 1 diabetes was also significantly associated with the age-adjusted risk of hemorrhagic stroke (4.5 [1.4–14.1]), but type 2 diabetes was not (1.1 [0.8–1.6]). Controlling for hypertension modestly attenuated these relationships, but additional adjustment for other time-dependent covariates did not appreciably alter the relationship between either type of diabetes and risk of stroke subtypes (Table 2). Ischemic stroke, lacunar infarction, and large-artery occlusive infarction had similar associations with diabetes. Women with longer duration of type 1 (data not shown) and type 2 diabetes (Table 3) tended to have a higher risk of stroke than did women with a shorter duration.

The association between type 2 diabetes and risk of ischemic stroke subtypes was seen in obese (BMI ≥30) and nonobese (BMI <30) women (Table 4). Likewise, the association between type 2 diabetes and risk of stroke subtypes was observed in both hypertensive and nonhypertensive women. The interaction terms of hypertension and diabetes for incidence of total stroke and stroke subtypes were not statistically significant.

CONCLUSIONS

In this 24-year follow-up study, both type 1 and type 2 diabetes were associated with a significantly higher risk of stroke and its subtypes in women, but the association with type 1 diabetes was stronger. The excess risk of stroke and its subtypes associated with type 2 diabetes was amplified in the presence of hypertension. We were not able to examine the relationship between diabetes and risk of subarachnoid or intraparenchymal hemorrhage because of the small number of cases.

The risk of stroke in patients with type 1 diabetes has been assessed in few epidemiological studies and usually with limited sample size, and the results have been inconsistent. In a multinational study, increased risk of stroke mortality was observed among individuals with type 1 and type 2 diabetes, but there was considerable variation among countries (19,20). A U.K. cohort study found higher total but not hemorrhagic stroke mortality among type 1 diabetic individuals than among the general population (18). Recently, a U.K. cohort study showed that total stroke mortality was 4.8-fold higher in women with type 1 diabetes than in nondiabetic women (33). Our study suggests that type 1 diabetes markedly raises the risk of all stroke subtypes in women. Women with type 1 diabetes have a 6.3-fold higher risk of ischemic stroke, a nearly fourfold higher risk of hemorrhagic stroke, and a sevenfold higher risk of large-artery occlusive and lacunar infarction than women without diabetes, even after controlling for age, BMI, and other cardiovascular risk factors.

Most studies have shown that type 2 diabetes is an important risk factor for ischemic stroke, whereas the incidence of hemorrhagic stroke has not been increased (16,17,34) or has been significantly decreased (1). We found an increased risk of hemorrhagic stroke among women with type 1 diabetes; however, this result was based on only three cases. Although there was no significant risk for those with type 2 diabetes, our results could not exclude a 40–60% increased risk for hemorrhagic stroke. In the Rochester, Minnesota, study (15), type 2 diabetes was not an independent risk factor for stroke among women. In the joint report from the Honolulu Heart Study and the Framingham Stroke Study, the incidence of ischemic stroke was more than twofold higher in patients with diabetes than in the general population, whereas the rates of hemorrhagic stroke were almost the same (2). In the Asia Pacific Cohort Studies, ischemic stroke was increased 2.6-fold, whereas hemorrhagic stroke was not significantly increased (35). In the Honolulu Heart Program, diabetes was not associated with an increased risk of hemorrhagic stroke in men, whereas in the Framingham Study, there was a 4.5-fold higher risk of hemorrhagic stroke in men with diabetes (3). For hemorrhagic stroke, a study showed that in patients with both diabetes and arterial hypertension, the severity of fibrinoid necrosis of small cerebral arteriole walls, often associated with intracerebral hemorrhage, was less pronounced than in those with hypertension alone (36).

Our findings of an excess of lacunar infarcts in women with diabetes have been observed in other studies (37,38). Diabetes can cause small-vessel arteriolopathy, especially in the retina, kidney, and deep structures in the brain (39).

The pathophysiology of cerebrovascular disease in patients with diabetes is not fully characterized, but both large and small blood vessels seem to be affected. Potential underlying mechanisms include excess glycation, endothelial dysfunction, increased platelet aggregation, impaired fibrinolysis, and insulin resistance. Associated dyslipidemia and hypertension also probably contribute (40). Endothelial proliferation and thickening of the basement membrane in small blood vessels lead to increased risk of lacunar infarction (41,42). Increased coagulability and platelet aggregability as well as decreased fibrinolysis in diabetic patients may augment the risk of large-artery infarction (40). To decrease the risk of stroke associated with diabetes, treatment of underlying glycemia, hypertension, dyslipidemia, and platelet aggregation must all be considered.

We found that the incidence of stroke subtypes was higher in women with type 1 diabetes than in women with type 2 diabetes. A higher incidence of stroke subtypes among those with type 1 diabetes could be attributable to younger age at onset, longer duration of diabetes, insulin deficiency, and development of hypertension with diabetic nephropathy, disturbances of coagulation-fibrinolytic parameters, increased platelet adhesiveness, or episodes of hypoglycemia. This finding warrants further study.

Obesity is associated with both type 2 diabetes and stroke. A Japanese study (8) showed that the excess risk of ischemic stroke associated with diabetes was observed primarily in nonhypertensive subjects and in those with high BMI. However, we found that type 2 diabetes was associated with increased risk for ischemic stroke subtypes regardless of obesity. Similarly, our findings confirm those of other studies (5,11,19,43) that the risk of stroke associated with a history of both type 2 diabetes and hypertension was substantially greater than that for diabetes alone.

Our study has several strengths and limitations. The strengths include the prospective cohort design, long-term follow-up, large sample size, and detailed information on potential confounding factors. Data collection on incident strokes was quite complete, and a high percentage of events was confirmed by imaging studies. Selection and information bias was unlikely because of the prospective design and high rate of follow-up.

One limitation of our study was that because diabetes was determined by self-report and confirmed through a validated diagnostic questionnaire, those participants identified as not having diabetes inevitably included some women with undiagnosed type 2 diabetes. However, this misclassification would tend to reduce rather than increase the significance of differences between diabetes and stroke. A few women with type 2 diabetes may have been misclassified as having type 1 diabetes, and some with late onset type 1 diabetes may have been included in our group of women with type 2 diabetes; however, these misclassifications are unlikely to have accounted for the observed differences in risk. Although residual confounding may be present owing to imperfect measurement of dietary components and lipid levels, it is unlikely to account for more than a portion of the remaining excess risk. Additionally, because the study participants were mainly white women, the results may not apply to other racial/ethnic groups or to men.

In summary, our study indicates that women with both type 1 and type 2 diabetes have an increased risk for ischemic stroke and that type 1 diabetes is associated with excess risk of hemorrhagic stroke. The risk of stroke is also associated with duration of type 2 diabetes. With the worldwide increasing prevalence of diabetes, the population-attributable risk of stroke will probably increase. Our results also emphasize the importance of controlling all known stroke risk factors, especially hypertension, in patients with diabetes.

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Table 1—

Age-adjusted characteristics* of women (116,316) by diabetes status, the Nurses’ Health Study, 1976–2002

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Table 2—

Incidence rates and RRs of stroke subtypes by diabetes, the Nurses’ Health Study, 1976–2002

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Table 3—

Incidence rates and RRs of stroke subtypes by type 2 diabetes duration, the Nurses’ Health Study, 1976–2002

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Table 4—

RRs of stroke subtypes and diabetes, according to hypertension and obesity status, the Nurses’ Health Study, 1976–2002

Acknowledgments

National Institutes of Health Grants DK58845, HL34594, and P01CA87969 supported this work.

Footnotes

  • Published ahead of print at http://care.diabetesjournals.org on 27 March 2007. DOI: 10.2337/dc06-2363.

    A table elsewhere in this issue shows conventional and Système International (SI) units and conversion factors for many substances.

    The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked “advertisement” in accordance with 18 U.S.C Section 1734 solely to indicate this fact.

    • Accepted March 20, 2007.
    • Received November 18, 2006.
  • DIABETES CARE

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Diabetes Care: 30 (7)

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July 2007, 30(7)
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Prospective Study of Type 1 and Type 2 Diabetes and Risk of Stroke Subtypes
Mohsen Janghorbani, Frank B. Hu, Walter C. Willett, Tricia Y. Li, Joann E. Manson, Giancarlo Logroscino, Kathryn M. Rexrode
Diabetes Care Jul 2007, 30 (7) 1730-1735; DOI: 10.2337/dc06-2363

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Prospective Study of Type 1 and Type 2 Diabetes and Risk of Stroke Subtypes
Mohsen Janghorbani, Frank B. Hu, Walter C. Willett, Tricia Y. Li, Joann E. Manson, Giancarlo Logroscino, Kathryn M. Rexrode
Diabetes Care Jul 2007, 30 (7) 1730-1735; DOI: 10.2337/dc06-2363
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