Blood viscosity changes in slow coronary flow patients

Area of Science:

• Cardiology
• Hematology
• Microcirculation

Background:

• Microvascular dysfunction is a known factor in slow coronary flow (SCF) pathogenesis.
• The role of intrinsic blood properties, such as blood viscosity, in SCF remains less explored.

Purpose of the Study:

• To investigate the contribution of erythrocyte aggregation, erythrocyte deformability, and plasma viscosity to the pathophysiology of slow coronary flow (SCF).

Main Methods:

• Compared blood viscosity parameters in 33 SCF patients and 23 controls.
• Quantified coronary flow using Thrombolysis in Myocardial Infarction (TIMI) frame count.
• Measured erythrocyte aggregation and deformability using an ektacytometer.
• Assessed plasma viscosity with a cone-plate viscometer.

Main Results:

• SCF patients exhibited significantly higher aggregation amplitude and area A index compared to controls (p < 0.001 and p < 0.01, respectively).
• No significant differences were observed in aggregation half-time, aggregation index, erythrocyte elongation index, or plasma viscosity between groups.
• A positive correlation was found between TIMI frame count in the left anterior descending artery and aggregation amplitude in SCF patients (r = 0.679, p < 0.0001).

Conclusions:

• Elevated erythrocyte aggregation is a potential contributing factor to the development of slow coronary flow (SCF).
• Further large-scale studies are warranted to validate these findings and explore therapeutic implications.