Relationship between elevated serum gamma-glutamyltransferase activity and slow coronary flow

Area of Science:

• Cardiology
• Biochemistry
• Vascular Biology

Background:

• Slow coronary flow (SCF) is a condition characterized by impaired coronary blood flow without significant epicardial coronary artery disease.
• The role of serum markers in the pathophysiology of SCF remains incompletely understood.
• Gamma-glutamyltransferase (GGT) is an enzyme often associated with liver function but also implicated in oxidative stress and inflammation.

Purpose of the Study:

• To investigate the association between serum GGT activity and the presence of SCF.
• To compare GGT levels in patients with SCF, coronary artery disease (CAD), and healthy controls.
• To determine if GGT is an independent predictor of impaired coronary flow.

Main Methods:

• A study involving 90 patients with SCF, 88 patients with CAD (normal flow), and 86 healthy controls.
• Coronary blood flow was assessed using the corrected TIMI frame count (TFC) method.
• Serum GGT levels were measured and compared across the three groups.

Main Results:

• Serum GGT activity was significantly elevated in both SCF and CAD groups compared to controls.
• Patients with SCF exhibited significantly higher TFC values, indicating slower coronary flow.
• Serum GGT activity showed a moderate positive correlation with mean TFC and was identified as an independent predictor of reduced coronary flow.

Conclusions:

• This study demonstrates a novel association between elevated serum GGT activity and slow coronary flow.
• Increased GGT may play a role in the physiopathology of SCF.
• Further research is necessary to elucidate the precise mechanisms linking GGT to SCF.