Observations on blood viscosity changes after acute myocardial infarction

Area of Science:

• Cardiovascular Medicine
• Hematology
• Clinical Pathology

Background:

• Acute myocardial infarction (AMI) is a critical condition affecting cardiac function.
• Blood rheology, including viscosity and aggregation, plays a role in cardiovascular health.
• Understanding rheological changes post-AMI is crucial for patient management.

Purpose of the Study:

• To investigate serial changes in blood rheology after acute myocardial infarction.
• To identify the contributing factors to elevated blood viscosity over time.
• To correlate initial blood viscosity with the incidence of post-MI complications.

Main Methods:

• Serial measurements of blood viscosity, plasma viscosity, hematocrit, and plasma protein concentrations.
• Analysis of rheological parameters in 25 patients admitted with acute myocardial infarction.
• Correlation of blood viscosity with clinical outcomes and complications.

Main Results:

• Blood viscosity was elevated on admission and persisted for over 21 days post-AMI.
• Early elevation (first 3 days) was primarily due to high hematocrit.
• Later elevation was associated with increased plasma viscosity and red cell aggregation, linked to higher alpha 2 globulin and fibrinogen levels.
• Higher admission blood viscosity correlated with increased incidence of shock, thromboembolism, and left ventricular failure.

Conclusions:

• Blood viscosity is significantly altered in acute myocardial infarction patients for an extended period.
• The rheological profile shifts from hematocrit-driven to plasma viscosity and red cell aggregation-driven post-AMI.
• Elevated blood viscosity upon admission is a predictor of adverse clinical outcomes in acute myocardial infarction.