High sensitive troponin-I in patients with slow coronary flow pattern

Area of Science:

• Cardiology
• Biomarkers
• Diagnostic Medicine

Background:

• Slow coronary flow (SCF) is a condition characterized by delayed distal embolization in epicardial coronary arteries despite the absence of obstructive coronary artery disease.
• Elevated cardiac biomarkers, such as high-sensitive cardiac troponin-I (HsTn-I), are typically indicative of myocardial injury.
• The role of HsTn-I in patients with SCF pattern remains incompletely understood.

Purpose of the Study:

• To investigate the hypothesis that HsTn-I levels are elevated in patients diagnosed with SCF.
• To compare HsTn-I levels in patients with SCF, coronary artery disease (CAD), and normal coronary arteries.

Main Methods:

• Coronary angiography (CAG) was performed on 97 patients presenting with chest discomfort and indications for the procedure.
• Patients were categorized into three groups: SCF pattern (n=39), CAD (n=28), and normal coronary arteries (n=30).
• Plasma HsTn-I levels were measured and compared across the groups, along with an analysis of cardiovascular risk factors and TIMI frame count.

Main Results:

• TIMI frame count was significantly higher in the SCF group compared to both CAD and normal coronary artery groups (p < 0.001).
• HsTn-I positivity did not differ significantly between the SCF and normal coronary artery groups (p = 0.512).
• HsTn-I positivity was significantly higher in the CAD group compared to the SCF and normal coronary artery groups (p < 0.001).

Conclusions:

• HsTn-I may be detectable in patients with SCF, but its levels are not significantly elevated compared to individuals with normal coronary arteries.
• The findings suggest that elevated HsTn-I is not a characteristic feature of the SCF pattern itself, distinguishing it from obstructive CAD.