Fibrinolytic activity in men with acute myocardial infarction before 60 years of age
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Men who had a myocardial infarction before age 60 showed reduced plasma fibrinolytic activity, especially those with high diastolic blood pressure. This suggests impaired blood clot breakdown post-heart attack, linked to apolipoprotein AI levels.
Area of Science:
- Cardiovascular Medicine
- Hematology
- Biochemistry
Background:
- Acute myocardial infarction (AMI) survivors may experience long-term cardiovascular complications.
- Fibrinolytic activity is crucial for dissolving blood clots and maintaining vascular health.
- Impaired fibrinolysis is implicated in thrombotic events and cardiovascular disease progression.
Purpose of the Study:
- To investigate plasma fibrinolytic activity in men following an early-life myocardial infarction.
- To compare fibrinolytic capacity between AMI survivors with normal and elevated diastolic blood pressure and healthy controls.
- To explore potential correlations between fibrinolysis and specific biomarkers like apolipoprotein AI.
Main Methods:
- Assessed plasma fibrinolytic activity using venous occlusion in 66 men 1-5 years post-MI (before age 60) and 32 age/sex-matched controls.
- Subdivided MI group based on diastolic blood pressure (normal vs. elevated).
- Employed variance analysis and Student's t-test for statistical comparisons; analyzed relationship with apolipoprotein AI.
Main Results:
- No statistically significant differences in fibrinolytic activity were found between the three groups via variance analysis.
- However, Student's t-test revealed significantly lower fibrinolytic activity in the MI group with elevated diastolic pressure compared to the reference group.
- A significant relationship was identified between apolipoprotein AI levels and fibrinolytic activity after repeated provocation.
Conclusions:
- Men with a history of early myocardial infarction, particularly those with elevated diastolic blood pressure, may exhibit reduced fibrinolytic capacity.
- Impaired fibrinolysis post-MI could contribute to an increased risk of recurrent thrombotic events.
- Apolipoprotein AI may play a role in modulating fibrinolytic function in this patient population.
Abstract:
Fibrinolytic activity in plasma after venous occlusion was determined on two consecutive days 1-5 years after an acute myocardial infarction sustained before the age of 60 years in a group of 66 non-diabetic men with normal serum cholesterol levels, and in an age- and sex-matched reference group of 32 men. The infarction group was divided into 2 subgroups: one with normal (n = 42), the other with elevated (n = 24) diastolic blood pressure. Variance analysis did not reveal any statistically significant differences in fibrinolytic activity after repeated provocation between the three groups, but in a Student's test the value was significantly lower in the infarction group with high diastolic pressure than in the reference group. A relationship was found between apolipoprotein AI and fibrinolytic activity after repeated provocation.