Fractional flow reserve of non-culprit vessel post-myocardial infarction: is it reliable?

Area of Science:

• Cardiology
• Interventional Cardiology
• Cardiac Physiology

Background:

• Multi-vessel coronary artery disease is common in myocardial infarction (MI) patients, influencing prognosis.
• Revascularization of non-culprit vessels is often guided by ischemia proven through non-invasive tests.
• Fractional flow reserve (FFR) is increasingly used in acute coronary syndrome (ACS) to assess lesion severity.

Observation:

• A case report details an FFR-guided strategy for non-culprit vessels three weeks post-ST-elevation myocardial infarction (STEMI).
• This strategy was followed by a transient, short-term sub-occlusion of the assessed non-culprit vessel.

Findings:

• The study highlights the uncertainty in coronary microcirculation recovery timing after MI, which can affect FFR accuracy.
• Potential for false-negative FFR results exists in the early post-MI period.
• Gaps in understanding the relationship between ischemia, plaque vulnerability, and FFR require further investigation.

Implications:

• FFR-guided revascularization decisions in the early post-MI phase warrant careful consideration.
• Clinical interpretation of FFR in the context of recent MI needs to account for potential microcirculatory dysfunction.
• Further research is needed to optimize the timing and application of FFR in managing multi-vessel disease post-MI.