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Hypo-fibrinolysis in patients with hypertension and elevated cholesterol
J H Jansson1, B Johansson, K Boman
1Department of Internal Medicine, Skellefteå Hospital, Sweden.
Insights
Patients with high blood pressure and high cholesterol exhibit reduced fibrinolytic system activity. This involves lower tissue plasminogen activator (tPA) activity and higher plasminogen activator inhibitor-1 (PAI-1) levels, indicating impaired blood clot breakdown.
Area of Science:
- Cardiovascular Science
- Hematology
- Metabolic Disorders
Background:
- Hypertension and hyperlipidaemia are significant risk factors for cardiovascular disease.
- The fibrinolytic system plays a crucial role in dissolving blood clots.
- Alterations in fibrinolysis may contribute to the pathophysiology of hypertension and hyperlipidaemia.
Purpose of the Study:
- To investigate the impact of combined hypertension and hyperlipidaemia on the fibrinolytic system.
- To compare fibrinolytic markers between a high-risk group and a matched control group.
Main Methods:
- 84 subjects with hypertension and elevated cholesterol (high-risk group) were compared to 55 controls.
- Measurements included plasminogen activator inhibitor-1 (PAI-1) and tissue plasminogen activator (tPA) antigen and activity.
- Assessments were performed before and after venous occlusion.
Main Results:
- The high-risk group showed significantly lower tPA activity and higher PAI-1 levels compared to controls.
- Multivariate analysis revealed triglyceride, diastolic blood pressure, and cholesterol levels were independently associated with PAI-1.
- Diastolic blood pressure was inversely associated with resting tPA activity.
Conclusions:
- Hypertension and hyperlipidaemia are associated with a diminished fibrinolytic system activity.
- This impairment is independent of age, sex, smoking, or BMI.
- The findings suggest a potential mechanism linking these metabolic risk factors to thrombotic events.
Abstract:
To test the hypothesis that increased blood pressure and hyperlipidaemia result in changes in the fibrinolytic system, 84 subjects with both hypertension and elevated serum cholesterol levels (the high risk group) were compared with 55 controls matched with respect to age, sex and body mass index (BMI). Plasminogen activator inhibitor (PAI-1), and tissue plasminogen activator (tPA) antigen and activity were measured before and after venous occlusion. In the high risk group, tPA activity was significantly lower both before and after venous occlusion and PAI-1 levels were significantly higher. In a multivariate analysis the triglyceride levels, diastolic blood pressure and cholesterol levels were independently associated with the PAI-1 levels. Diastolic blood pressure was independently and inversely associated with resting tPA activity. We conclude that patients with hypertension and hyperlipidaemia have a reduced activity of the fibrinolytic system, an effect which is unrelated to differences in age, sex, smoking or BMI.