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  • Title: Low level of tissue plasminogen activator activity in non-diabetic patients with a first myocardial infarction.
    Author: Lundblad D, Dinesen B, Rautio A, Røder ME, Eliasson M.
    Journal: J Intern Med; 2005 Jul; 258(1):13-20. PubMed ID: 15953128.
    Abstract:
    OBJECTIVE: To explore the role of tissue plasminogen activator (tPA) activity and plasminogen activator inhibitor type 1 (PAI-1) in survivors of a first myocardial infarction (MI). Insulin and proinsulin were analysed as potential risk factors. DESIGN: Case-control study in northern Sweden. SUBJECTS: A total of 115 patients under 65 years of age with a first MI were enrolled and recalled for further examination 3 months later. Twenty-seven patients were excluded, 17 with known diabetes and 10 who did not come to the follow-up, giving a final number of 88 patients, 73 men and 15 women. Patients were age- and sex-matched with control subjects drawn from the local cohort in the MONICA population survey 1994. MAIN OUTCOME MEASURES: We compared MI patients and controls using univariate and multiple regression analyses including odds ratios (OR). RESULTS: PAI-1 activity, fibrinogen, postload insulin and -proinsulin were significantly higher and tPA activity significantly lower in MI patients in the univariate analysis. In a multiple regression analysis, including also age, sex and cardiovascular risk factors, these parameters were divided in quartiles. The lowest quartile of tPA activity was significantly associated with MI (OR = 19.1; CI 3.0-123) together with the highest quartiles of fibrinogen (OR = 25; CI 5.2-120) but other variables were not. CONCLUSION: Low tPA activity, i.e. low fibrinolytic activity, characterized nondiabetic subjects after a first MI which is not explained by concomitant disturbances in metabolic and anthropometric variables.
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