Related Experiment Video
Updated: Jul 30, 2026

Measurement of Factor V Activity in Human Plasma Using a Microplate Coagulation Assay
Published on: September 9, 2012
Plasma fibrinogen--a major coronary risk factor
Insights
High plasma fibrinogen levels significantly increase heart attack risk, independent of other factors. This finding highlights fibrinogen as a crucial coronary risk indicator for identifying individuals susceptible to myocardial infarction.
Area of Science:
- Cardiology
- Hematology
- Epidemiology
Background:
- Coronary heart disease (CHD) remains a leading cause of mortality worldwide.
- Identifying reliable indicators of heart attack susceptibility is crucial for preventive strategies.
- Plasma fibrinogen's role as a cardiovascular risk marker requires further elucidation.
Purpose of the Study:
- To investigate the association between plasma fibrinogen levels and the incidence of heart attacks in men without pre-existing CHD.
- To determine if plasma fibrinogen is an independent predictor of heart attack risk.
Main Methods:
- A cohort of 297 men aged 40-69, free from overt CHD at baseline, was observed.
- Plasma fibrinogen levels were measured at the start of the study.
- Follow-up averaged 7.3 years to record new heart attacks.
Main Results:
- A significant positive correlation was observed between initial plasma fibrinogen levels and subsequent heart attack incidence.
- Men with high fibrinogen had a substantially higher heart attack risk, especially when combined with high cholesterol or blood pressure.
- Plasma fibrinogen emerged as a significant and independent predictor of heart attacks, comparable in importance to cholesterol, blood pressure, and smoking.
Conclusions:
- Elevated plasma fibrinogen is a significant independent risk factor for heart attacks.
- Plasma fibrinogen levels should be incorporated into risk assessment profiles for identifying individuals at high risk of myocardial infarction.
Abstract:
The role of plasma fibrinogen as a potential indicator of susceptibility to heart attacks was studied in a sample of 297 men aged 40-69 years at entry who were initially free from overt coronary heart disease. During a mean observation period of 7.3 years (range 0.1-16.1) new heart attacks occurred in 40 men. There was a significant positive correlation between initial plasma fibrinogen levels and the subsequent incidence of heart attacks. In men with high cholesterol or high systolic blood pressure levels the incidence of heart attacks was respectively six times and 12 times greater in those with high plasma fibrinogen levels than in those with low fibrinogen levels. In multivariate models plasma fibrinogen was a highly significant and independent explanatory variable, at least as important as serum cholesterol, blood pressure or cigarette smoking. These results suggest that high plasma fibrinogen levels are an important coronary risk factor and should be included in profiles used to identify those at high risk of heart attacks.
Related Concept Videos
Anticoagulant Drugs: Low-Molecular-Weight Heparins
Extrinsic and Intrinsic Pathways of Hemostasis
The Extrinsic Pathway
The extrinsic pathway of coagulation is typically initiated by tissue damage that exposes blood to tissue factor (TF), a protein released by the damaged tissue cells outside the blood vessels—this interaction with TF triggers biochemical reactions involving specific clotting factors. The key player here is Factor VII, which forms a...
Clot Retraction and Fibrinolysis
Coronary Artery Disease I: Introduction
Coronary Artery Disease II: Pathophysiology
Coronary Artery Disease IV: Preventive Measures

